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315 lines
127 KiB
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315 lines
127 KiB
HTML
<!DOCTYPE html><html lang="en-US"><head><title>PostgreSQL with Node</title><meta property="og:title" content="PostgreSQL with Node"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container 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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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g[data-mml-node=merror]>g{fill:red;stroke:red}div#\:\$p>svg>foreignObject>section g[data-mml-node=merror]>rect[data-background]{fill:yellow;stroke:none}div#\:\$p>svg>foreignObject>section g[data-mml-node=mtable]>line[data-line],div#\:\$p>svg>foreignObject>section svg[data-table]>g>line[data-line]{stroke-width:70px;fill:none}div#\:\$p>svg>foreignObject>section g[data-mml-node=mtable]>rect[data-frame],div#\:\$p>svg>foreignObject>section svg[data-table]>g>rect[data-frame]{stroke-width:70px;fill:none}div#\:\$p>svg>foreignObject>section g[data-mml-node=mtable]>.mjx-dashed,div#\:\$p>svg>foreignObject>section svg[data-table]>g>.mjx-dashed{stroke-dasharray:140}div#\:\$p>svg>foreignObject>section g[data-mml-node=mtable]>.mjx-dotted,div#\:\$p>svg>foreignObject>section svg[data-table]>g>.mjx-dotted{stroke-linecap:round;stroke-dasharray:0,140}div#\:\$p>svg>foreignObject>section g[data-mml-node=mtable]>g>svg{overflow:visible}div#\:\$p>svg>foreignObject>section [jax=SVG] mjx-tool{display:inline-block;position:relative;width:0;height:0}div#\:\$p>svg>foreignObject>section [jax=SVG] mjx-tool>mjx-tip{position:absolute;top:0;left:0}div#\:\$p>svg>foreignObject>section mjx-tool>mjx-tip{display:inline-block;padding:.2em;border:1px solid #888;font-size:70%;background-color:#F8F8F8;color:black;box-shadow:2px 2px 5px #AAAAAA}div#\:\$p>svg>foreignObject>section g[data-mml-node=maction][data-toggle]{cursor:pointer}div#\:\$p>svg>foreignObject>section mjx-status{display:block;position:fixed;left:1em;bottom:1em;min-width:25%;padding:.2em .4em;border:1px solid #888;font-size:90%;background-color:#F8F8F8;color:black}div#\:\$p>svg>foreignObject>section foreignObject[data-mjx-xml]{font-family:initial;line-height:normal;overflow:visible}div#\:\$p>svg>foreignObject>section mjx-container[jax=SVG] path[data-c],div#\:\$p>svg>foreignObject>section mjx-container[jax=SVG] use[data-c]{stroke-width:3}@media print{div#\:\$p>svg>foreignObject>section mjx-container[jax=SVG] 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/* buutti.css */
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/* @theme buutti */div#\:\$p>svg>foreignObject>section .columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns12{display:grid;grid-template-columns:1fr 2fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns21{display:grid;grid-template-columns:2fr 1fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns32{display:grid;grid-template-columns:3fr 2fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns23{display:grid;grid-template-columns:2fr 3fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns111{display:grid;grid-template-columns:1fr 1fr 1fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .centered{display:flex;flex-direction:column;justify-content:center;text-align:center}div#\:\$p>svg>foreignObject>section .tableborderless td,div#\:\$p>svg>foreignObject>section th{border:none!important;border-collapse:collapse}div#\:\$p>svg>foreignObject>section.extra{background-color:#5d275d;background-image:linear-gradient(to bottom,#401a40,#1d0c1d);color:white}div#\:\$p>svg>foreignObject>section.extra a{color:rgb(145,255,209)}div#\:\$p>svg>foreignObject>section.exercise{background-color:#29366f;background-image:linear-gradient(to bottom,#20636a,#173742);color:white}div#\:\$p>svg>foreignObject>section.exercise a{color:rgb(211,173,255)}
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/* @theme ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r */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="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
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<h1 id="postgresql-with-node">PostgreSQL with Node</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-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
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<h2 id="setting-up-a-dockerized-postgres-environment">Setting up a Dockerized Postgres environment</h2>
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<ul>
|
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<li data-marpit-fragment="1">These lectures assume you have a Dockerized Postgres instance set up
|
|
<ul>
|
|
<li data-marpit-fragment="2">Follow the <a href="https://gitea.buutti.com/education/webdev-basics/src/branch/main/sql-databases.md">Webdev basics: SQL Databases</a> lectures first.</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="3">Done? Great!</li>
|
|
<li data-marpit-fragment="4">Using our previously created, Dockerized Postgres instance, we'll create a Node application to connect to our database.
|
|
<ul>
|
|
<li data-marpit-fragment="5">If you have deleted your postgres container, just create a new one with the same command.</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="6">If your container has shut down (after a reboot for example), you can start it with<pre is="marp-pre" data-auto-scaling="downscale-only"><code>docker start my-postgres
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
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<h2 id="preparing-our-node-application">Preparing our Node application</h2>
|
|
<p>Initialize a new TypeScript application.</p>
|
|
<p>Install <a href="https://www.npmjs.com/package/express">express</a> and <a href="https://www.npmjs.com/package/pg">PostgreSQL client for Node.JS</a>, and their respective TypeScript types</p>
|
|
<p>Install <a href="https://www.npmjs.com/package/dotenv">dotenv</a>, nodemon and ts-node development dependencies</p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="dotenv">Dotenv</h2>
|
|
<p>Example of <code>.env</code> file:</p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>PORT=3000
|
|
PG_HOST=localhost
|
|
PG_PORT=5432
|
|
PG_USERNAME=pguser
|
|
PG_PASSWORD=mypassword
|
|
PG_DATABASE=postgres
|
|
</code></pre>
|
|
<p>These values must match the values declared when running the PostgreSQL container.</p>
|
|
<p>The database must exist as well.</p>
|
|
<p>Note that the example uses the default "postgres" database, but you can use any database you want.</p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="dotenv-continued">Dotenv (continued)</h2>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span>
|
|
<span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"products_api"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"version"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.0.0"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"scripts"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
|
|
<span class="hljs-attr">"dev"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"nodemon -r dotenv/config ./src/index.ts"</span>
|
|
<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"dependencies"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
|
|
<span class="hljs-attr">"express"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^4.18.2"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"pg"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^8.9.0"</span>
|
|
<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"devDependencies"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
|
|
<span class="hljs-attr">"@types/express"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^4.17.17"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"@types/pg"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^8.6.6"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"dotenv"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^16.0.3"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"nodemon"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^2.0.20"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"ts-node"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^10.9.1"</span><span class="hljs-punctuation">,</span>
|
|
<span class="hljs-attr">"typescript"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"^4.9.5"</span>
|
|
<span class="hljs-punctuation">}</span>
|
|
<span class="hljs-punctuation">}</span>
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<p>Dotenv is usually only used in development, not in production. In professional setting the dotenv config is often preloaded in the development startup script</p>
|
|
<p>You can require dotenv when running <code>npm run dev</code></p>
|
|
<p><code>-r</code> is short for <code>--require</code></p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="7" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="dotenv-and-git">Dotenv and Git</h2>
|
|
<ul>
|
|
<li data-marpit-fragment="1"><code>.env</code> files usually contain sensitive data that we do <em>not</em> want to store in Git repositories.</li>
|
|
<li data-marpit-fragment="2">Thus, usually <code>.env</code> file is excluded from the Git repository
|
|
<ul>
|
|
<li data-marpit-fragment="3">Add <code>.env</code> to <code>.gitignore</code></li>
|
|
<li data-marpit-fragment="4">If you have auto-generated .gitignore with <code>npx gitignore Node</code>, environment files are excluded automatically<br />
|
|
<img src="imgs/3-databases-with-docker_16.png" alt="" /></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="8" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="connecting-to-postgresql">Connecting to PostgreSQL</h2>
|
|
<p>Our database file contains functions and configuration for initializing the Postgres pool, creating tables and running queries.</p>
|
|
<p>At the moment, we have only one query. It is a single-use query that creates a products table to the database if such table does not yet exist.</p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-ts"><span class="hljs-comment">// db.ts</span>
|
|
<span class="hljs-keyword">import</span> pg <span class="hljs-keyword">from</span> <span class="hljs-string">"pg"</span>;
|
|
<span class="hljs-keyword">const</span> { <span class="hljs-variable constant_">PG_HOST</span>, <span class="hljs-variable constant_">PG_PORT</span>, <span class="hljs-variable constant_">PG_USERNAME</span>, <span class="hljs-variable constant_">PG_PASSWORD</span>, <span class="hljs-variable constant_">PG_DATABASE</span> } = process.<span class="hljs-property">env</span>;
|
|
|
|
<span class="hljs-keyword">const</span> pool = <span class="hljs-keyword">new</span> pg.<span class="hljs-title class_">Pool</span>({
|
|
<span class="hljs-attr">host</span>: <span class="hljs-variable constant_">PG_HOST</span>,
|
|
<span class="hljs-attr">port</span>: <span class="hljs-title class_">Number</span>(<span class="hljs-variable constant_">PG_PORT</span>),
|
|
<span class="hljs-attr">user</span>: <span class="hljs-variable constant_">PG_USERNAME</span>,
|
|
<span class="hljs-attr">password</span>: <span class="hljs-variable constant_">PG_PASSWORD</span>,
|
|
<span class="hljs-attr">database</span>: <span class="hljs-variable constant_">PG_DATABASE</span>,
|
|
});
|
|
|
|
<span class="hljs-keyword">const</span> <span class="hljs-title function_">executeQuery</span> = <span class="hljs-keyword">async</span> (<span class="hljs-params">query: <span class="hljs-built_in">string</span>, parameters?: <span class="hljs-built_in">Array</span><<span class="hljs-built_in">any</span>></span>) => {
|
|
<span class="hljs-keyword">const</span> client = <span class="hljs-keyword">await</span> pool.<span class="hljs-title function_">connect</span>();
|
|
<span class="hljs-keyword">try</span> {
|
|
<span class="hljs-keyword">const</span> result = <span class="hljs-keyword">await</span> client.<span class="hljs-title function_">query</span>(query, parameters);
|
|
<span class="hljs-keyword">return</span> result;
|
|
} <span class="hljs-keyword">catch</span> (<span class="hljs-attr">error</span>: <span class="hljs-built_in">any</span>) {
|
|
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(error.<span class="hljs-property">stack</span>);
|
|
error.<span class="hljs-property">name</span> = <span class="hljs-string">"dbError"</span>;
|
|
<span class="hljs-keyword">throw</span> error;
|
|
} <span class="hljs-keyword">finally</span> {
|
|
client.<span class="hljs-title function_">release</span>();
|
|
}
|
|
};
|
|
|
|
<span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> <span class="hljs-title function_">createProductsTable</span> = <span class="hljs-keyword">async</span> (<span class="hljs-params"></span>) => {
|
|
<span class="hljs-keyword">const</span> query = <span class="hljs-string">`CREATE TABLE IF NOT EXISTS "products" (
|
|
"id" SERIAL PRIMARY KEY,
|
|
"name" VARCHAR(100) NOT NULL,
|
|
"price" REAL NOT NULL
|
|
)`</span>;
|
|
<span class="hljs-keyword">await</span> <span class="hljs-title function_">executeQuery</span>(query);
|
|
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">"Products table initialized"</span>);
|
|
};
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<p>At the moment our <code>index.ts</code> does nothing but creates a single table for our database and launches express server.</p>
|
|
<p>It doesn't even have any endpoints, so it's not much of a server yet.</p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-ts"><span class="hljs-keyword">import</span> express <span class="hljs-keyword">from</span> <span class="hljs-string">"express"</span>;
|
|
<span class="hljs-keyword">import</span> { createProductsTable } <span class="hljs-keyword">from</span> <span class="hljs-string">"./db"</span>;
|
|
|
|
<span class="hljs-keyword">const</span> server = <span class="hljs-title function_">express</span>();
|
|
<span class="hljs-title function_">createProductsTable</span>();
|
|
|
|
<span class="hljs-keyword">const</span> { <span class="hljs-variable constant_">PORT</span> } = process.<span class="hljs-property">env</span>;
|
|
|
|
server.<span class="hljs-title function_">listen</span>(<span class="hljs-variable constant_">PORT</span>, <span class="hljs-function">() =></span> {
|
|
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">"Products API listening to port"</span>, <span class="hljs-variable constant_">PORT</span>);
|
|
});
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="launching-the-application">Launching the application</h2>
|
|
<p>Let's use our predefined <code>npm run dev</code></p>
|
|
<p><img src="imgs/3-databases-with-docker_17.png" alt="" /></p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<p>…And check with psql that our application succeeds in connecting to the database and creating the table.</p>
|
|
<p>Epic success!</p>
|
|
<p><img src="imgs/3-databases-with-docker_18.png" alt="" /><br />
|
|
b</p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="exercise invert" data-marpit-pagination="12" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="exercise-1-node--postgresql">Exercise 1: Node & PostgreSQL</h2>
|
|
|
|
<p>Following the lecture example, create an Express server that connects to your local PostgreSQL instance. The database information should be stored in environment variables. When the server starts, it should create a product table with three columns: id (serial, primary key), name (varchar) and price (real).</p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="creating-queries">Creating Queries</h2>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Next, we will create an actual CRUD API for communicating with the database.</li>
|
|
<li data-marpit-fragment="2">For that we need endpoints for creating, reading, updating and deleting products.
|
|
<ul>
|
|
<li data-marpit-fragment="3">All of these need their own queries.</li>
|
|
</ul>
|
|
</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="6" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="14" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="using-queries">Using queries</h2>
|
|
<ul>
|
|
<li data-marpit-fragment="1">We'll use the pre-made executeQuery() function for querying the database from a few slides back</li>
|
|
<li data-marpit-fragment="2">It takes in two arguments:
|
|
<ul>
|
|
<li data-marpit-fragment="3">the actual query string</li>
|
|
<li data-marpit-fragment="4">an optional parameters array</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="5">When supplying parameters, the query string should have placeholders $1, $2, etc
|
|
<ul>
|
|
<li data-marpit-fragment="6">These will be replaced with the contents of the parameters array.</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="15" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="parameterized-queries-example">Parameterized queries example</h2>
|
|
<p><img src="imgs/3-databases-with-docker_19.png" alt="" /></p>
|
|
<p>When running <code>executeQuery(query, parameters)</code> with the above values defined, the query would be parsed as</p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-operator">*</span> <span class="hljs-keyword">FROM</span> cats <span class="hljs-keyword">WHERE</span> color <span class="hljs-operator">=</span> <span class="hljs-string">'yellow'</span> <span class="hljs-keyword">and</span> age <span class="hljs-operator">></span> <span class="hljs-number">10</span>;
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="16" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="why-not-just-use-string-templating">Why not just use String templating?</h2>
|
|
<p>…Because of <a href="https://fi.wikipedia.org/wiki/SQL-injektio">SQL injections</a> . Always use database library's built-in parameterization!</p>
|
|
<p><em>NEVER DO THIS!!!</em></p>
|
|
<p><img src="imgs/3-databases-with-docker_20.png" alt="" /></p>
|
|
<p><img src="imgs/3-databases-with-docker_21.png" alt="" /></p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="17" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="creating-queries-1">Creating queries</h2>
|
|
<p>We will create a Data Access Object, <code>dao.ts</code> that will handle interacting with our database.</p>
|
|
<p>The idea is that we want to just tell our DAO what we want done (e.g. "add this customer to the database") and the DAO will handle the details of that action.</p>
|
|
<p>The DAO will also return possible additional information that was created during the action.</p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="18" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<p>Our insertProduct function</p>
|
|
<p>generates a new, unique ID for the product using <a href="https://www.npmjs.com/package/uuid">uuid</a></p>
|
|
<p>constructs a parameters array containing said id, the name of the product and the price of the product</p>
|
|
<p>executes the query using db.executeQuery method</p>
|
|
<p>returns the database result object</p>
|
|
<p><img src="imgs/3-databases-with-docker_22.png" alt="" /></p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="19" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<div class='columns' markdown='1'>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/3-databases-with-docker_23.png" alt="" /></p>
|
|
</div>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/3-databases-with-docker_24.png" alt="" /></p>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="20" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<p>The rest of the DAO operations work in similar fashion.</p>
|
|
<p>The router that declares the endpoints, uses the DAO to interact with the database.</p>
|
|
</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="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="testing-the-api">Testing the API</h2>
|
|
<div class='columns' markdown='1'>
|
|
<div markdown='1'>
|
|
<p>Now we can use Insomnia to verify that all the endpoints work as expected.</p>
|
|
<p>We can also use psql to observe the changes in the database</p>
|
|
<p><img src="imgs/3-databases-with-docker_26.png" alt="" /></p>
|
|
</div>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/3-databases-with-docker_25.png" alt="" /></p>
|
|
</div>
|
|
</div>
|
|
</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="exercise invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="exercise invert" data-marpit-pagination="22" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="exercise-2-creating-queries">Exercise 2: Creating Queries</h2>
|
|
|
|
<p>Continue following the lecture example. Create a router and a database access object to handle</p>
|
|
<ul>
|
|
<li>Creating a product</li>
|
|
<li>Reading a product</li>
|
|
<li>Updating a product</li>
|
|
<li>Deleting a product</li>
|
|
<li>Listing all products</li>
|
|
</ul>
|
|
</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="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="23" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="dockerized-postgresql-app">Dockerized PostgreSQL App</h2>
|
|
</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="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="24" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="setting-environment-variables">Setting Environment Variables</h2>
|
|
<p>Docker has two kinds of environment variables: run-time and build-time.</p>
|
|
<p>In this scenario we want to set our environment variables at <em>build time</em>. This means that the Docker image will contain all the environment variable information, including sensitive things like passwords. This might be an issue in some scenarios. In those cases the environment variables need to be set at <em>run time</em>.</p>
|
|
<p>In the Dockerfile we set the build-time values by setting ARG parameters. Then we use these values to set the run-time environment variables by setting ENV parameters.</p>
|
|
<p>More information: <a href="https://vsupalov.com/docker-arg-env-variable-guide/">https://vsupalov.com/docker-arg-env-variable-guide/</a></p>
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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="25" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="25" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
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|
<p>When the ARGs and ENVs have been set in the Dockerfile, we provide the ARG values when building the Docker image by using_--build-arg <key>=<value>_ flags. To build an image with these parameters, we'd use something like</p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>docker build
|
|
--build-arg PORT=3000
|
|
--build-arg PG_HOST=https://my.postgres.server
|
|
--build-arg PG_PORT=5432
|
|
--build-arg PG_USERNAME=pguser
|
|
--build-arg PG_PASSWORD=pgpass
|
|
--build-arg PG_DATABASE=my-database
|
|
-t my-app .
|
|
</code></pre>
|
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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="26" data-paginate="true" data-class="invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="invert" data-marpit-pagination="26" style="--paginate:true;--class:invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<p>And include the build-arg parameters in our Dockerfile with them mapped to environment variables.</p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>ARG PORT
|
|
ARG PG_HOST
|
|
ARG PG_PORT
|
|
ARG PG_USERNAME
|
|
ARG PG_PASSWORD
|
|
ARG PG_DATABASE
|
|
|
|
ENV PORT=${PORT}
|
|
ENV PG_HOST=${PG_HOST}
|
|
ENV PG_PORT=${PG_PORT}
|
|
ENV PG_USERNAME=${PG_USERNAME}
|
|
ENV PG_PASSWORD=${PG_PASSWORD}
|
|
ENV PG_DATABASE=${PG_DATABASE}
|
|
</code></pre>
|
|
<p><a href="https://www.docker.com/blog/how-to-use-the-postgres-docker-official-image/">Docker documentation here!</a></p>
|
|
</section>
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|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27" data-paginate="true" data-class="exercise invert" data-heading-divider="5" data-theme="ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r" lang="en-US" class="exercise invert" data-marpit-pagination="27" style="--paginate:true;--class:exercise invert;--heading-divider:5;--theme:ygw6410gw2b9ab9z234e3tkm8fko5doymheqlutm14r;" data-marpit-pagination-total="27">
|
|
<h2 id="exercise-3-dockerized-pg-app">Exercise 3: Dockerized PG App</h2>
|
|
|
|
<p>Dockerize the application you have built. Build the docker image, run the app and test that it works using insomnia/postman.</p>
|
|
<p>Remember that when you run the application on your local Docker, both the app and the database are in the same Docker network, so you have to check the database IP address just like when running pgAdmin.</p>
|
|
</section>
|
|
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