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534 lines
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534 lines
147 KiB
HTML
<!DOCTYPE html><html lang="en-US"><head><title>5. Databases with Entity Framework</title><meta property="og:title" content="5. 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.bespoke-marp-note.active{display:block}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container .bespoke-marp-note p:first-child{margin-top:0}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container .bespoke-marp-note p:last-child{margin-bottom:0}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container{align-items:center;box-sizing:border-box;color:#eee;display:flex;flex-wrap:nowrap;grid-area:info;justify-content:center;overflow:hidden;padding:0 10px}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-page,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-time,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-timer{box-sizing:border-box;display:block;padding:0 10px;white-space:nowrap;width:100%}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{height:1.5em;line-height:1.5em;width:1.5em}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-page{order:2;text-align:center}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-page .bespoke-marp-presenter-info-page-text{display:inline-block;min-width:120px;text-align:center}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-time{color:#999;order:1;text-align:left}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-timer{color:#999;order:3;text-align:right}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-timer:hover{cursor:pointer}}@media print{.bespoke-marp-presenter-info-container,.bespoke-marp-presenter-next-container,.bespoke-marp-presenter-note-container{display:none}}</style><style>div#\:\$p>svg>foreignObject>section{width:1280px;height:720px;box-sizing:border-box;overflow:hidden;position:relative;scroll-snap-align:center center}div#\:\$p>svg>foreignObject>section:after{bottom:0;content:attr(data-marpit-pagination);padding:inherit;pointer-events:none;position:absolute;right:0}div#\:\$p>svg>foreignObject>section:not([data-marpit-pagination]):after{display:none}/* Normalization */div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){font-size:2em;margin:0.67em 0}div#\:\$p>svg>foreignObject>section video::-webkit-media-controls{will-change:transform}@page{size:1280px 720px;margin:0}@media print{body,html{background-color:#fff;margin:0;page-break-inside:avoid;break-inside:avoid-page}div#\:\$p>svg>foreignObject>section{page-break-before:always;break-before:page}div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section *{-webkit-print-color-adjust:exact!important;animation-delay:0s!important;animation-duration:0s!important;color-adjust:exact!important;transition:none!important}div#\:\$p>svg[data-marpit-svg]{display:block;height:100vh;width:100vw}}
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/*!
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* Marp default theme.
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*
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* @theme default
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* @author Yuki Hattori
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*
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* @auto-scaling true
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* @size 16:9 1280px 720px
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* @size 4:3 960px 720px
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*/div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section [data-theme=light]{--color-prettylights-syntax-comment:#6e7781;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-brackethighlighter-unmatched:#82071e;--color-prettylights-syntax-invalid-illegal-text:#f6f8fa;--color-prettylights-syntax-invalid-illegal-bg:#82071e;--color-prettylights-syntax-carriage-return-text:#f6f8fa;--color-prettylights-syntax-carriage-return-bg:#cf222e;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-list:#3b2300;--color-prettylights-syntax-markup-heading:#0550ae;--color-prettylights-syntax-markup-italic:#24292f;--color-prettylights-syntax-markup-bold:#24292f;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-markup-changed-text:#953800;--color-prettylights-syntax-markup-changed-bg:#ffd8b5;--color-prettylights-syntax-markup-ignored-text:#eaeef2;--color-prettylights-syntax-markup-ignored-bg:#0550ae;--color-prettylights-syntax-meta-diff-range:#8250df;--color-prettylights-syntax-brackethighlighter-angle:#57606a;--color-prettylights-syntax-sublimelinter-gutter-mark:#8c959f;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-fg-subtle:#6e7781;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-attention-subtle:#fff8c5;--color-danger-fg:#d1242f;color-scheme:light}div#\:\$p>svg>foreignObject>section [data-theme=dark],div#\:\$p>svg>foreignObject>section:where(.invert){--color-prettylights-syntax-comment:#8b949e;--color-prettylights-syntax-constant:#79c0ff;--color-prettylights-syntax-entity:#d2a8ff;--color-prettylights-syntax-storage-modifier-import:#c9d1d9;--color-prettylights-syntax-entity-tag:#7ee787;--color-prettylights-syntax-keyword:#ff7b72;--color-prettylights-syntax-string:#a5d6ff;--color-prettylights-syntax-variable:#ffa657;--color-prettylights-syntax-brackethighlighter-unmatched:#f85149;--color-prettylights-syntax-invalid-illegal-text:#f0f6fc;--color-prettylights-syntax-invalid-illegal-bg:#8e1519;--color-prettylights-syntax-carriage-return-text:#f0f6fc;--color-prettylights-syntax-carriage-return-bg:#b62324;--color-prettylights-syntax-string-regexp:#7ee787;--color-prettylights-syntax-markup-list:#f2cc60;--color-prettylights-syntax-markup-heading:#1f6feb;--color-prettylights-syntax-markup-italic:#c9d1d9;--color-prettylights-syntax-markup-bold:#c9d1d9;--color-prettylights-syntax-markup-deleted-text:#ffdcd7;--color-prettylights-syntax-markup-deleted-bg:#67060c;--color-prettylights-syntax-markup-inserted-text:#aff5b4;--color-prettylights-syntax-markup-inserted-bg:#033a16;--color-prettylights-syntax-markup-changed-text:#ffdfb6;--color-prettylights-syntax-markup-changed-bg:#5a1e02;--color-prettylights-syntax-markup-ignored-text:#c9d1d9;--color-prettylights-syntax-markup-ignored-bg:#1158c7;--color-prettylights-syntax-meta-diff-range:#d2a8ff;--color-prettylights-syntax-brackethighlighter-angle:#8b949e;--color-prettylights-syntax-sublimelinter-gutter-mark:#484f58;--color-prettylights-syntax-constant-other-reference-link:#a5d6ff;--color-fg-default:#e6edf3;--color-fg-muted:#7d8590;--color-fg-subtle:#6e7681;--color-canvas-default:#0d1117;--color-canvas-subtle:#161b22;--color-border-default:#30363d;--color-border-muted:#21262d;--color-neutral-muted:hsla(215,8%,47%,.4);--color-accent-fg:#2f81f7;--color-accent-emphasis:#1f6feb;--color-attention-subtle:rgba(187,128,9,.15);--color-danger-fg:#f85149;color-scheme:dark}div#\:\$p>svg>foreignObject>section{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;word-wrap:break-word;background-color:var(--color-canvas-default);color:var(--color-fg-default);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;font-size:16px;line-height:1.5;margin:0}div#\:\$p>svg>foreignObject>section{--marpit-root-font-size:16px}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h2,marp-h2):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h3,marp-h3):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h4,marp-h4):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h5,marp-h5):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h6,marp-h6):hover .anchor .octicon-link:before{background-color:currentColor;content:" ";display:inline-block;height:16px;-webkit-mask-image:url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 0 0 1.06 1.06l1.25-1.25a2 2 0 1 1 2.83 2.83l-2.5 2.5a2 2 0 0 1-2.83 0 .75.75 0 0 0-1.06 1.06 3.5 3.5 0 0 0 4.95 0l2.5-2.5a3.5 3.5 0 0 0-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 0 1 0-2.83l2.5-2.5a2 2 0 0 1 2.83 0 .75.75 0 0 0 1.06-1.06 3.5 3.5 0 0 0-4.95 0l-2.5 2.5a3.5 3.5 0 0 0 4.95 4.95l1.25-1.25a.75.75 0 0 0-1.06-1.06l-1.25 1.25a2 2 0 0 1-2.83 0z"/></svg>');mask-image:url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 0 0 1.06 1.06l1.25-1.25a2 2 0 1 1 2.83 2.83l-2.5 2.5a2 2 0 0 1-2.83 0 .75.75 0 0 0-1.06 1.06 3.5 3.5 0 0 0 4.95 0l2.5-2.5a3.5 3.5 0 0 0-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 0 1 0-2.83l2.5-2.5a2 2 0 0 1 2.83 0 .75.75 0 0 0 1.06-1.06 3.5 3.5 0 0 0-4.95 0l-2.5 2.5a3.5 3.5 0 0 0 4.95 4.95l1.25-1.25a.75.75 0 0 0-1.06-1.06l-1.25 1.25a2 2 0 0 1-2.83 0z"/></svg>');width:16px}div#\:\$p>svg>foreignObject>section details,div#\:\$p>svg>foreignObject>section figcaption,div#\:\$p>svg>foreignObject>section figure{display:block}div#\:\$p>svg>foreignObject>section summary{display:list-item}div#\:\$p>svg>foreignObject>section [hidden]{display:none!important}div#\:\$p>svg>foreignObject>section a{background-color:transparent;color:var(--color-accent-fg);text-decoration:none}div#\:\$p>svg>foreignObject>section abbr[title]{border-bottom:none;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}div#\:\$p>svg>foreignObject>section b,div#\:\$p>svg>foreignObject>section strong{font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section dfn{font-style:italic}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){border-bottom:1px solid var(--color-border-muted);font-size:2em;font-weight:var(--base-text-weight-semibold,600);margin:.67em 0;padding-bottom:.3em}div#\:\$p>svg>foreignObject>section mark{background-color:var(--color-attention-subtle);color:var(--color-fg-default)}div#\:\$p>svg>foreignObject>section small{font-size:90%}div#\:\$p>svg>foreignObject>section sub,div#\:\$p>svg>foreignObject>section sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}div#\:\$p>svg>foreignObject>section sub{bottom:-.25em}div#\:\$p>svg>foreignObject>section sup{top:-.5em}div#\:\$p>svg>foreignObject>section img{background-color:var(--color-canvas-default);border-style:none;box-sizing:content-box;max-width:100%}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre),div#\:\$p>svg>foreignObject>section code,div#\:\$p>svg>foreignObject>section kbd,div#\:\$p>svg>foreignObject>section samp{font-family:monospace;font-size:1em}div#\:\$p>svg>foreignObject>section figure{margin:1em 40px}div#\:\$p>svg>foreignObject>section hr{background:transparent;background-color:var(--color-border-default);border:0;box-sizing:content-box;height:.25em;margin:24px 0;overflow:hidden;padding:0}div#\:\$p>svg>foreignObject>section input{font:inherit;font-family:inherit;font-size:inherit;line-height:inherit;margin:0;overflow:visible}div#\:\$p>svg>foreignObject>section [type=button],div#\:\$p>svg>foreignObject>section [type=reset],div#\:\$p>svg>foreignObject>section [type=submit]{-webkit-appearance:button}div#\:\$p>svg>foreignObject>section [type=checkbox],div#\:\$p>svg>foreignObject>section [type=radio]{box-sizing:border-box;padding:0}div#\:\$p>svg>foreignObject>section [type=number]::-webkit-inner-spin-button,div#\:\$p>svg>foreignObject>section [type=number]::-webkit-outer-spin-button{height:auto}div#\:\$p>svg>foreignObject>section [type=search]::-webkit-search-cancel-button,div#\:\$p>svg>foreignObject>section [type=search]::-webkit-search-decoration{-webkit-appearance:none}div#\:\$p>svg>foreignObject>section ::-webkit-input-placeholder{color:inherit;opacity:.54}div#\:\$p>svg>foreignObject>section ::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}div#\:\$p>svg>foreignObject>section a:hover{text-decoration:underline}div#\:\$p>svg>foreignObject>section ::-moz-placeholder{color:var(--color-fg-subtle);opacity:1}div#\:\$p>svg>foreignObject>section ::placeholder{color:var(--color-fg-subtle);opacity:1}div#\:\$p>svg>foreignObject>section hr:after,div#\:\$p>svg>foreignObject>section hr:before{content:"";display:table}div#\:\$p>svg>foreignObject>section hr:after{clear:both}div#\:\$p>svg>foreignObject>section table{border-collapse:collapse;border-spacing:0;display:block;max-width:100%;overflow:auto;width:-moz-max-content;width:max-content}div#\:\$p>svg>foreignObject>section td,div#\:\$p>svg>foreignObject>section th{padding:0}div#\:\$p>svg>foreignObject>section details summary{cursor:pointer}div#\:\$p>svg>foreignObject>section details:not([open])>:not(summary){display:none!important}div#\:\$p>svg>foreignObject>section [role=button]:focus,div#\:\$p>svg>foreignObject>section a:focus,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus,div#\:\$p>svg>foreignObject>section input[type=radio]:focus{box-shadow:none;outline:2px solid var(--color-accent-fg);outline-offset:-2px}div#\:\$p>svg>foreignObject>section [role=button]:focus:not(:focus-visible),div#\:\$p>svg>foreignObject>section a:focus:not(:focus-visible),div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus:not(:focus-visible),div#\:\$p>svg>foreignObject>section input[type=radio]:focus:not(:focus-visible){outline:1px solid transparent}div#\:\$p>svg>foreignObject>section [role=button]:focus-visible,div#\:\$p>svg>foreignObject>section a:focus-visible,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus-visible,div#\:\$p>svg>foreignObject>section input[type=radio]:focus-visible{box-shadow:none;outline:2px solid var(--color-accent-fg);outline-offset:-2px}div#\:\$p>svg>foreignObject>section a:not([class]):focus,div#\:\$p>svg>foreignObject>section a:not([class]):focus-visible,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus-visible,div#\:\$p>svg>foreignObject>section input[type=radio]:focus,div#\:\$p>svg>foreignObject>section input[type=radio]:focus-visible{outline-offset:0}div#\:\$p>svg>foreignObject>section kbd{background-color:var(--color-canvas-subtle);border-bottom-color:var(--color-neutral-muted);border:1px solid var(--color-neutral-muted);border-radius:6px;box-shadow:inset 0 -1px 0 var(--color-neutral-muted);color:var(--color-fg-default);display:inline-block;font:11px ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace;line-height:10px;padding:3px 5px;vertical-align:middle}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1),div#\:\$p>svg>foreignObject>section :is(h2,marp-h2),div#\:\$p>svg>foreignObject>section :is(h3,marp-h3),div#\:\$p>svg>foreignObject>section :is(h4,marp-h4),div#\:\$p>svg>foreignObject>section :is(h5,marp-h5),div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){font-weight:var(--base-text-weight-semibold,600);line-height:1.25;margin-bottom:16px;margin-top:24px}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){border-bottom:1px solid var(--color-border-muted);font-size:1.5em;padding-bottom:.3em}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2),div#\:\$p>svg>foreignObject>section :is(h3,marp-h3){font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section :is(h3,marp-h3){font-size:1.25em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4){font-size:1em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4),div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-size:.875em}div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){color:var(--color-fg-muted);font-size:.85em;font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section p{margin-bottom:10px;margin-top:0}div#\:\$p>svg>foreignObject>section blockquote{border-left:.25em solid var(--color-border-default);color:var(--color-fg-muted);margin:0;padding:0 1em}div#\:\$p>svg>foreignObject>section ol,div#\:\$p>svg>foreignObject>section ul{margin-bottom:0;margin-top:0;padding-left:2em}div#\:\$p>svg>foreignObject>section ol ol,div#\:\$p>svg>foreignObject>section ul ol{list-style-type:lower-roman}div#\:\$p>svg>foreignObject>section ol ol ol,div#\:\$p>svg>foreignObject>section ol ul ol,div#\:\$p>svg>foreignObject>section ul ol ol,div#\:\$p>svg>foreignObject>section ul ul ol{list-style-type:lower-alpha}div#\:\$p>svg>foreignObject>section dd{margin-left:0}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre),div#\:\$p>svg>foreignObject>section code,div#\:\$p>svg>foreignObject>section samp,div#\:\$p>svg>foreignObject>section tt{font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace;font-size:12px}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre){word-wrap:normal;margin-bottom:0;margin-top:0}div#\:\$p>svg>foreignObject>section .octicon{fill:currentColor;display:inline-block;overflow:visible!important;vertical-align:text-bottom}div#\:\$p>svg>foreignObject>section input::-webkit-inner-spin-button,div#\:\$p>svg>foreignObject>section input::-webkit-outer-spin-button{-webkit-appearance:none;appearance:none;margin:0}div#\:\$p>svg>foreignObject>section:after,div#\:\$p>svg>foreignObject>section:before{
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/* buutti.css */
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/* @theme gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh */div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]{columns:initial!important;display:block!important;padding:0!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure>figcaption{position:absolute;border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;white-space:nowrap;width:1px}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content],div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#\:\$p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h1 id="databases-with-entity-framework">Databases with Entity Framework</h1>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h2 id="contents">Contents</h2>
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<ul>
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<li><a href="#entity-framework-ef">Entity Framework (EF)</a></li>
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<li><a href="#code-first-approach">Code First approach</a></li>
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<li><a href="#migrations">Migrations</a></li>
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<li><a href="#database-first-approach">Database First approach</a></li>
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</ul>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h2 id="entity-framework-ef">Entity Framework (EF)</h2>
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<ul>
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<li data-marpit-fragment="1"><a href="https://learn.microsoft.com/en-us/ef/">Entity Framework</a> is an Object-Relational Mapper (ORM) made by Microsoft for the .NET framework
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<ul>
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<li data-marpit-fragment="2">Object-Relational Mapping: converting from database representation to objects in a programming language</li>
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</ul>
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</li>
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<li data-marpit-fragment="3">Allows creation of CRUD operations without writing SQL</li>
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</ul>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h3 id="entity-framework-core-ef-core">Entity Framework Core (EF Core)</h3>
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<ul>
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<li data-marpit-fragment="1"><a href="https://learn.microsoft.com/en-us/ef/core/">EF Core</a> is a cross-platform version of EF</li>
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<li data-marpit-fragment="2">Can be used outside of the .NET framework unlike normal Entity Framework</li>
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<li data-marpit-fragment="3">Open-source, lightweight, extensible</li>
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<li data-marpit-fragment="4">Supports many database engines, such as MySQL, PostgreSQL, and so on</li>
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<li data-marpit-fragment="5">This is what we'll be using</li>
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</ul>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h3 id="code-first-vs-database-first-vs-model-first">Code First vs Database First vs Model First</h3>
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<ul>
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<li data-marpit-fragment="1">There are three approaches through which Entity Framework can be implemented
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<ul>
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<li data-marpit-fragment="2">Code First</li>
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<li data-marpit-fragment="3">Database First</li>
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<li data-marpit-fragment="4">Model First</li>
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</ul>
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</li>
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<li data-marpit-fragment="5">Database First and Code First are the most used ones and will be introduced in this lecture</li>
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</ul>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h3 id="note-about-loading-data">Note about loading data</h3>
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<ul>
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<li data-marpit-fragment="1">In EF Core, you can use <a href="https://learn.microsoft.com/en-us/ef/ef6/fundamentals/relationships">navigation properties</a> in your model to load related entities</li>
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<li data-marpit-fragment="2">There are three common ORM patterns to load related data
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<ul>
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<li data-marpit-fragment="3"><a href="https://learn.microsoft.com/en-us/ef/core/querying/related-data/eager">Eager loading</a>: the related data is loaded from the database as part of the initial query.</li>
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<li data-marpit-fragment="4"><a href="https://learn.microsoft.com/en-us/ef/core/querying/related-data/explicit">Explicit loading</a>: the related data is explicitly loaded from the database at a later time.</li>
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<li data-marpit-fragment="5"><a href="https://learn.microsoft.com/en-us/ef/core/querying/related-data/lazy">Lazy loading</a>: the related data is transparently loaded from the database when the navigation property is accessed.</li>
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</ul>
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</li>
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</ul>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="7" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h2 id="code-first-approach">Code First approach</h2>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="8" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
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<h3 id="code-first">Code First</h3>
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<ul>
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<li data-marpit-fragment="1">In the Code First approach, Entity Framework will create databases and tables based on defined <em><strong>entity classes</strong></em></li>
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<li data-marpit-fragment="2">Good for small applications</li>
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<li data-marpit-fragment="3">Other advantages include:
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<ul>
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<li data-marpit-fragment="4">You can create the database and tables from your <a href="https://en.wikipedia.org/wiki/Business_object">business objects</a></li>
|
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<li data-marpit-fragment="5">You can specify which related collections are
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<ul>
|
|
<li data-marpit-fragment="6">eager loaded</li>
|
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<li data-marpit-fragment="7">not serialized at all</li>
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|
</ul>
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</li>
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<li data-marpit-fragment="8">Database version control</li>
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</ul>
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</li>
|
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<li data-marpit-fragment="9">Not preferred for data intensive applications</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="required-packages">Required Packages</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Install and add the following packages to your project:
|
|
<ul>
|
|
<li data-marpit-fragment="2"><code>Microsoft.EntityFrameworkCore</code></li>
|
|
<li data-marpit-fragment="3"><code>Microsoft.EntityFrameworkCore.Tools</code></li>
|
|
<li data-marpit-fragment="4"><code>Npgsql.EntityFrameworkCore.PostgreSQL</code></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
<div class='centered'>
|
|
<p><img src="imgs/7-databases-with-entity-framework_11.png" alt="" style="width:1000px;" /></p>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="code-first-dbcontext">Code First: <code>DbContext</code></h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Let's begin with the Code First Approach</li>
|
|
<li data-marpit-fragment="2">The <code>DbContext</code> class of EFCore is the bridge between the code representation of your data (entities) and the database</li>
|
|
<li data-marpit-fragment="3"><code>DbContext</code> holds<br />
|
|
a) methods to form the database schema with Code First approach and<br />
|
|
b) classes to keep the database up-to-date with CRUD operations
|
|
<ul>
|
|
<li data-marpit-fragment="4">DATABASE <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.054ex;" xmlns="http://www.w3.org/2000/svg" width="2.262ex" height="1.242ex" role="img" focusable="false" viewBox="0 -525 1000 549"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="21D2" d="M580 514Q580 525 596 525Q601 525 604 525T609 525T613 524T615 523T617 520T619 517T622 512Q659 438 720 381T831 300T927 263Q944 258 944 250T935 239T898 228T840 204Q696 134 622 -12Q618 -21 615 -22T600 -24Q580 -24 580 -17Q580 -13 585 0Q620 69 671 123L681 133H70Q56 140 56 153Q56 168 72 173H725L735 181Q774 211 852 250Q851 251 834 259T789 283T735 319L725 327H72Q56 332 56 347Q56 360 70 367H681L671 377Q638 412 609 458T580 514Z"></path></g></g></g></svg></mjx-container> CODE: <code>DbSet</code> class property in <code>DbContext</code> can be queried directly with LINQ and this results in an object in your code</li>
|
|
<li data-marpit-fragment="5">CODE <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.054ex;" xmlns="http://www.w3.org/2000/svg" width="2.262ex" height="1.242ex" role="img" focusable="false" viewBox="0 -525 1000 549"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="21D2" d="M580 514Q580 525 596 525Q601 525 604 525T609 525T613 524T615 523T617 520T619 517T622 512Q659 438 720 381T831 300T927 263Q944 258 944 250T935 239T898 228T840 204Q696 134 622 -12Q618 -21 615 -22T600 -24Q580 -24 580 -17Q580 -13 585 0Q620 69 671 123L681 133H70Q56 140 56 153Q56 168 72 173H725L735 181Q774 211 852 250Q851 251 834 259T789 283T735 319L725 327H72Q56 332 56 347Q56 360 70 367H681L671 377Q638 412 609 458T580 514Z"></path></g></g></g></svg></mjx-container> DATABASE: <code>DbSet</code> also has methods like <code>Add</code>, <code>Update</code> and <code>Remove</code> to make changes to the database from your code</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="creating-a-context">Creating a context</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Create a context that inherits from <code>DbContext</code>
|
|
<ul>
|
|
<li data-marpit-fragment="2">Commonly located in the <code>Models</code> folder, but ideally should be in a separate abstraction/repository folder (for example <code>Repositories</code>)</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="3">The class needs to have a constructor that calls the base constructor with<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp">: <span class="hljs-keyword">base</span>(options)
|
|
</code></pre>
|
|
</li>
|
|
<li data-marpit-fragment="4">Create a <code>DbSet</code> property for each resource<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactsContext</span> : <span class="hljs-title">DbContext</span>
|
|
{
|
|
<span class="hljs-keyword">public</span> DbSet<Contact> Contacts { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactsContext</span>(<span class="hljs-params">DbContextOptions<ContactsContext> options</span>) : <span class="hljs-title">base</span>(<span class="hljs-params">options</span>)</span> { }
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="12" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<ul>
|
|
<li data-marpit-fragment="1">To further configure how the database will be structured, override the <code>OnModelCreating</code> method</li>
|
|
<li data-marpit-fragment="2">In this example, one table named <code>Contact</code> with columns <code>Id</code>, <code>Name</code> and <code>Email</code> will be created:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactsContext</span> : <span class="hljs-title">DbContext</span>
|
|
{
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">DbSet</span><<span class="hljs-title">Contact</span>> Contacts</span> { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactsContext</span>(<span class="hljs-params">DbContextOptions<ContactsContext> options</span>) : <span class="hljs-title">base</span>(<span class="hljs-params">options</span>)</span> { }
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">override</span> <span class="hljs-keyword">void</span> <span class="hljs-title">OnModelCreating</span>(<span class="hljs-params">ModelBuilder modelBuilder</span>)</span>
|
|
{
|
|
modelBuilder.Entity<Contact>().ToTable(<span class="hljs-string">"Contact"</span>);
|
|
}
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<ul>
|
|
<li data-marpit-fragment="1">In this example, the Contact table will be created with some starting values for <code>Id</code>, <code>Name</code> and <code>Email</code> columns:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactsContext</span> : <span class="hljs-title">DbContext</span>
|
|
{
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">DbSet</span><<span class="hljs-title">Contact</span>> Contacts</span> { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactsContext</span>(<span class="hljs-params">DbContextOptions<ContactsContext> options</span>) : <span class="hljs-title">base</span>(<span class="hljs-params">options</span>)</span> { }
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">override</span> <span class="hljs-keyword">void</span> <span class="hljs-title">OnModelCreating</span>(<span class="hljs-params">ModelBuilder modelBuilder</span>)</span>
|
|
{
|
|
modelBuilder.Entity<Contact>().HasData(
|
|
<span class="hljs-keyword">new</span> Contact { Id = <span class="hljs-number">1</span>, Name = <span class="hljs-string">"Johannes Kantola"</span>, Email = <span class="hljs-string">"johkant@example.com"</span> },
|
|
<span class="hljs-keyword">new</span> Contact { Id = <span class="hljs-number">2</span>, Name = <span class="hljs-string">"Rene Orosz"</span>, Email = <span class="hljs-string">"rene_king@example.com"</span> }
|
|
);
|
|
}
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="14" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="dbcontext-as-a-service">DbContext as a Service</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">In <code>Program.cs</code>, add the context to services with <code>AddDbContext</code> method</li>
|
|
<li data-marpit-fragment="2">This is where you set the DB management system you want to use (MySQL, PostgreSQL, SQLite...)
|
|
<ul>
|
|
<li data-marpit-fragment="3">The EFCore support for PostgreSQL is called <code>Npgsql</code> as in the package name</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="4">Add the server, host, port, username, password and the database name of the existing database inside <code>options.UseNpgsql</code> as a <em><strong>connection string</strong></em>:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp">services.AddDbContext<ContactsContext>(options => options.UseNpgsql(
|
|
<span class="hljs-string">@"Server=PostgreSQL 12;Host=localhost;Port=5432;Username=postgres;Password=1234;Database=contacts"</span>));
|
|
services.AddScoped<IContactRepository, ContactRepository>();
|
|
services.AddControllers().AddNewtonsoftJson();
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="15" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h2 id="migrations">Migrations</h2>
|
|
<ul>
|
|
<li data-marpit-fragment="1">As the development progresses, models and database schemas change over time
|
|
<ul>
|
|
<li data-marpit-fragment="2">This means that both the database and the code needs to be updated to match each other</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="3">Migrations allow for the database to keep in sync with the code schematically
|
|
<ul>
|
|
<li data-marpit-fragment="4">The data stored in the database is also preserved</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="5">EFCore migrations have built-in version control; a snapshot of each version of the schema is stored</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="16" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="applying-migrations">Applying migrations</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Open the Package Manager Console in Visual Studio
|
|
<ul>
|
|
<li data-marpit-fragment="2">If the tab is not in the bottom of the window, open it from<br /> <em>View > Other windows > Package Manager Console</em></li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="3">Add your initial migration by entering the command <code>Add-Migration <name></code> to the console, for example<br />
|
|
<code>Add-Migration InitialMigration</code>
|
|
<ul>
|
|
<li data-marpit-fragment="4">This now creates the first "blueprint" of how the database should be structured</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="5">Update the database by entering the command <code>Update-Database</code> to the console
|
|
<ul>
|
|
<li data-marpit-fragment="6">This will update the existing database according to the <code>ModelBuilder</code> options</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="17" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<ul>
|
|
<li data-marpit-fragment="1">At this point, the values you have entered (<code>Contacts</code> table in this example) should show up in the database. You can check it up e.g. in pgAdmin.</li>
|
|
</ul>
|
|
<div class='columns12' markdown='1'>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/7-databases-with-entity-framework_13.png" alt="" /></p>
|
|
</div>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/7-databases-with-entity-framework_12.png" alt="" /></p>
|
|
</div>
|
|
</div>
|
|
<ul>
|
|
<li data-marpit-fragment="2">Notice that the table and column names are initialized with a capital letter
|
|
<ul>
|
|
<li data-marpit-fragment="3">The value naming in psql is case sensitive<br />
|
|
<mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.054ex;" xmlns="http://www.w3.org/2000/svg" width="2.262ex" height="1.242ex" role="img" focusable="false" viewBox="0 -525 1000 549"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="21D2" d="M580 514Q580 525 596 525Q601 525 604 525T609 525T613 524T615 523T617 520T619 517T622 512Q659 438 720 381T831 300T927 263Q944 258 944 250T935 239T898 228T840 204Q696 134 622 -12Q618 -21 615 -22T600 -24Q580 -24 580 -17Q580 -13 585 0Q620 69 671 123L681 133H70Q56 140 56 153Q56 168 72 173H725L735 181Q774 211 852 250Q851 251 834 259T789 283T735 319L725 327H72Q56 332 56 347Q56 360 70 367H681L671 377Q638 412 609 458T580 514Z"></path></g></g></g></svg></mjx-container> All names have to be in quotation marks!</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-marpit-fragments="6" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="exercise invert" data-marpit-pagination="18" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="exercise-1-adding-context">Exercise 1: Adding Context</h3>
|
|
|
|
<p>Continue working on the CourseAPI.</p>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Create a new empty database <code>course_db</code> in pgAdmin or psql</li>
|
|
<li data-marpit-fragment="2">Create a <code>DbContext</code> for the courses. Name it <code>CoursesContext</code>, and add a <code>DbSet</code> of type <code>Course</code> to it, named <code>Courses</code></li>
|
|
<li data-marpit-fragment="3">Add the <code>OnModelCreating</code> method to the context and add a couple of courses with some starting values to the <code>modelBuilder</code></li>
|
|
<li data-marpit-fragment="4">Add the <code>CoursesContext</code> to the services in <code>Program.cs</code> with a connection string pointing to <code>course_db</code></li>
|
|
<li data-marpit-fragment="5">Add the first migration and update the database from the Package Manager Console</li>
|
|
<li data-marpit-fragment="6">Check that the <code>Course</code> table with the starting values has appeared to the database</li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="19" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="using-dbcontext-in-the-api">Using DbContext in the API</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Because <code>DbContext</code> is added to services, it can be accessed from any other service, such as the repository</li>
|
|
<li data-marpit-fragment="2">Using the <code>DbSet</code> for each model in your project, CRUD operations can be applied to the database from the repository with LINQ and <code>DbSet</code> methods
|
|
<ul>
|
|
<li data-marpit-fragment="3"><code>Add()</code></li>
|
|
<li data-marpit-fragment="4"><code>Update()</code></li>
|
|
<li data-marpit-fragment="5"><code>Remove()</code></li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="6">After modifying the <code>DbSet</code>, update the changes to the database with the <code>DbContext.SaveChanges()</code> method</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="20" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="injecting-dbcontext">Injecting DbContext</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Inject the <code>DbContext</code> to your repositories as you would any other service:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactRepository</span> : <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">readonly</span> ContactsContext _context;
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactRepository</span>(<span class="hljs-params">ContactsContext context</span>)</span>
|
|
{
|
|
_context = context;
|
|
}
|
|
<span class="hljs-comment">//...</span>
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="dbcontext-read-operations">DbContext: Read Operations</h3>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactRepository</span> : <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">readonly</span> ContactsContext _context;
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactRepository</span>(<span class="hljs-params">ContactsContext context</span>)</span> { ... }
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> Contact <span class="hljs-title">GetContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span> =>
|
|
_context.Contacts.FirstOrDefault(c => c.Id == id);
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> List<Contact> <span class="hljs-title">GetContacts</span>()</span> =>
|
|
_context.Contacts.ToList();
|
|
}
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="22" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="dbcontext-create-operations">DbContext: Create Operations</h3>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactRepository</span> : <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">readonly</span> ContactsContext _context;
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactRepository</span>(<span class="hljs-params">ContactsContext context</span>)</span> { ... }
|
|
|
|
<span class="hljs-comment">// Read operations</span>
|
|
<span class="hljs-comment">// ...</span>
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">AddContact</span>(<span class="hljs-params">Contact contact</span>)</span>
|
|
{
|
|
_context.Contacts.Add(contact);
|
|
_context.SaveChanges();
|
|
}
|
|
}
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="23" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="dbcontext-update-operations">DbContext: Update Operations</h3>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactRepository</span> : <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">readonly</span> ContactsContext _context;
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactRepository</span>(<span class="hljs-params">ContactsContext context</span>)</span> { ... }
|
|
|
|
<span class="hljs-comment">// Read & create operations</span>
|
|
<span class="hljs-comment">// ...</span>
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">UpdateContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id, Contact newContact</span>)</span>
|
|
{
|
|
<span class="hljs-keyword">var</span> contact = GetContact(id);
|
|
contact.Email = newContact.Email;
|
|
contact.Name = newContact.Name;
|
|
_context.Contacts.Update(contact);
|
|
_context.SaveChanges();
|
|
}
|
|
}
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="24" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="dbcontext-delete-operations">DbContext: Delete Operations</h3>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactRepository</span> : <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">readonly</span> ContactsContext _context;
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactRepository</span>(<span class="hljs-params">ContactsContext context</span>)</span> { ... }
|
|
|
|
<span class="hljs-comment">// Read, create & update operations</span>
|
|
<span class="hljs-comment">// ...</span>
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">DeleteContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span>
|
|
{
|
|
_context.Contacts.Remove(GetContact(id));
|
|
_context.SaveChanges();
|
|
}
|
|
}
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-marpit-fragments="2" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="exercise invert" data-marpit-pagination="25" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="exercise-2-crud-on-the-db">Exercise 2: CRUD on the DB</h3>
|
|
|
|
<p>Continue working on CourseAPI.</p>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Modify the <code>CourseRepository</code> to create, read, update and delete from the database instead of the locally stored list of courses</li>
|
|
<li data-marpit-fragment="2">Test with Postman. Keep refreshing the DB in pgAdmin or creating queries with psql to make sure the requests work as intended</li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="26" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="summing-things-up">Summing Things Up</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Now the API has been hooked up to a PostgreSQL database</li>
|
|
<li data-marpit-fragment="2">Changes to the schema are kept up-to-date with migrations</li>
|
|
<li data-marpit-fragment="3">Repository is processing CRUD operations to the database</li>
|
|
<li data-marpit-fragment="4">Controllers accepting HTTP requests have access to the repository</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="27" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="efcore-code-first-checklist">EFCore Code First Checklist</h3>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Install required packages</li>
|
|
<li data-marpit-fragment="2">Create <code>DbContext</code> for the database</li>
|
|
<li data-marpit-fragment="3">Add <code>DbContext</code> to services</li>
|
|
<li data-marpit-fragment="4"><code>Add-Migration</code> & <code>Update-Database</code></li>
|
|
<li data-marpit-fragment="5">Add CRUD operations to the database repository</li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="28" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="28" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="modifying-the-relations">Modifying the Relations</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Let's change the structure of our Contacts API by adding a new class <code>Account</code>
|
|
<ul>
|
|
<li data-marpit-fragment="2">Instead of <code>Contact</code> directly having an <code>Email</code>, it will have an <code>Account</code> instead</li>
|
|
<li data-marpit-fragment="3"><code>Account</code> holds the information about the <code>Email</code>, as well as a <code>Description</code> about the nature of the account (personal, work, school etc.)</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="4">Emails will be removed from the <code>Contacts</code> table</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="29" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="29" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-comment">// Models/Contact.cs</span>
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">Contact</span>
|
|
{
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">int</span> Id { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">string</span> Name { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-keyword">public</span> ICollection<Account> Accounts { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
}
|
|
</code></pre>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-comment">// Models/Account.cs</span>
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">Account</span>
|
|
{
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">int</span> Id { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">string</span> Email { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">string</span> Description { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">int</span> ContactId { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-keyword">public</span> Contact Contact { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
}
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="30" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="30" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<ul>
|
|
<li data-marpit-fragment="1">Adding a migration at this point will result in a warning:<br />
|
|
<img src="imgs/7-databases-with-entity-framework_14.png" alt="" style="width:1000px;" /></li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="31" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="31" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<div class='columns32' markdown='1'>
|
|
<div markdown='1'>
|
|
<ul>
|
|
<li data-marpit-fragment="1">In the generated migration file, you can find <code>Up</code> and <code>Down</code> methods
|
|
<ul>
|
|
<li data-marpit-fragment="2">The <code>Up</code> method describes the changes that will be made with the migration
|
|
<ul>
|
|
<li data-marpit-fragment="3">In this case, removing the <code>Email</code> column from <code>Contacts</code> table, and creating the new <code>Accounts</code> table</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="4">The <code>Down</code> method describes the changes that will be made if the migration is reverted</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="5">Updating the database will still work, and the database will have a new table <code>Accounts</code></li>
|
|
</ul>
|
|
</div>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/7-databases-with-entity-framework_15.png" alt="" /></p>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="32" data-marpit-fragments="4" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="exercise invert" data-marpit-pagination="32" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="exercise-3-adding-migrations">Exercise 3: Adding Migrations</h3>
|
|
|
|
<p>Continue working on CourseAPI.</p>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Add a new model <code>Lecture</code> with properties <code>int Id</code>, <code>DateTime StartTime</code>, <code>int Length</code>, <code>Course Course</code>, and <code>int CourseId</code></li>
|
|
<li data-marpit-fragment="2">Add a new property <code>ICollection<Lecture> Lectures</code> to the <code>Course</code> model</li>
|
|
<li data-marpit-fragment="3">Add a new migration named <code>AddLectures</code></li>
|
|
<li data-marpit-fragment="4">Update the database. Check that the changes show up in the database with pgAdmin</li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="33" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="33" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h2 id="database-first-approach">Database First approach</h2>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="34" data-marpit-fragments="7" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="34" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="what-is-the-database-first-approach">What is the Database First approach?</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">This is the other approach for creating a connection between the database and the application</li>
|
|
<li data-marpit-fragment="2">Databases and tables are created first, then you create an entity data model using the created database</li>
|
|
<li data-marpit-fragment="3">This approach is preferred for data intense, large applications</li>
|
|
<li data-marpit-fragment="4">Other advantages include:
|
|
<ul>
|
|
<li data-marpit-fragment="5">Data model is simple to create</li>
|
|
<li data-marpit-fragment="6">GUI</li>
|
|
<li data-marpit-fragment="7">You do not need to write any code to create your database</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="35" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="35" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="scaffolding">Scaffolding</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Use the Package Manager Console to "reverse engineer" the code for an existing database
|
|
<ul>
|
|
<li data-marpit-fragment="2">This is called <em><strong>scaffolding</strong></em></li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="3">Scaffold the database with the following command:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-powershell">Scaffold<span class="hljs-literal">-DbContext</span> <span class="hljs-string">"Server=PostgreSQL 12;Host=localhost;Port=5432;Username=postgres;Password=1234;Database=sqlpractice"</span> Npgsql.EntityFrameworkCore.PostgreSQL <span class="hljs-literal">-OutputDir</span> Models
|
|
</code></pre>
|
|
</li>
|
|
<li data-marpit-fragment="4">Using the connection string corresponding to your database, this will create all the classes for the entities in the DB as well as the context class</li>
|
|
</ul>
|
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</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="36" data-marpit-fragments="2" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="exercise invert" data-marpit-pagination="36" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="exercise-4-database-first">Exercise 4: Database First</h3>
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|
|
|
<p>Create a new ASP.NET Core web app using the API template.</p>
|
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<ol>
|
|
<li data-marpit-fragment="1">Install the required NuGet packages for using EFCore, EFCore Tools and PostgreSQL<br />
|
|
a) by using the package manager, or<br />
|
|
b) by copying the <code><PackageReference></code> lines from the <code>.csproj</code> file of the previous assignment to this project's <code>.csproj</code> file</li>
|
|
<li data-marpit-fragment="2">Scaffold the <code>sqlpractice</code> database created in <a href="sql-databases#exercise-1-preparing-the-database">SQL Databases Exercise 1</a> to the project by using the Database First approach. If you have not yet created the database in PostgreSQL, it can be found <a href="code-examples/example-query.sql">here</a></li>
|
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</ol>
|
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</section>
|
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="37" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="invert" data-marpit-pagination="37" style="--paginate:true;--class:invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="reading-authentication-with-roles">Reading: Authentication with roles</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1"><a href="https://www.c-sharpcorner.com/article/jwt-token-creation-authentication-and-authorization-in-asp-net-core-6-0-with-po/">Here's</a> an example how to do a role-based authentication by using JWT tokens</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="38" data-marpit-fragments="2" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh" lang="en-US" class="exercise invert" data-marpit-pagination="38" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:gqy7k3kdx5d6t13nmmhm7jdgeg2yxye7r5enweiq2sgh;" data-marpit-pagination-total="38">
|
|
<h3 id="exercise-5-extra-connection">Exercise 5 (Extra): Connection</h3>
|
|
|
|
<p>Continuing the previous exercise,</p>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Create and connect Postgres database to API and create a second entity with a relation to the first entity.</li>
|
|
<li data-marpit-fragment="2">Test your solution.</li>
|
|
</ol>
|
|
</section>
|
|
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