named_placeholders

compiles “select foo where foo.id = :bar and foo.baz < :baz" into "select foo where foo.id = ? and foo.baz < ?" + ["bar", "baz"]

usage

import { createCompiler, toNumbered } from "https://deno.land/x/named_placeholders@v1.0.0/mod.ts";
import { assert, assertEquals } from "https://deno.land/std@0.139.0/testing/asserts.ts";

Deno.test("compile", function() {
  const query = 'select users.json,EXISTS(select 1 from moderators where moderators.id = :id) as is_moderator from users where users.id = :id and users.status = :status and users.complete_status = :complete_status';
  const compile = createCompiler();
  const [ sql, args ] = compile(query, { id: 123, status: 'Yes!', complete_status: 'No!' });
  assert(sql, "select users.json,EXISTS(select 1 from moderators where moderators.id = ?) as is_moderator from users where users.id = ? and users.status = ? and users.complete_status = ?");
  assertEquals(args, [ 123, 123, 'Yes!', 'No!' ]);
});

Deno.test("toNumbered", function() {
  const query = 'select users.json,EXISTS(select 1 from moderators where moderators.id = :id) as is_moderator from users where users.id = :id and users.status = :status and users.complete_status = :complete_status';
  const [ sql, args ] = toNumbered(query, { id: 123, status: 'Yes!', complete_status: 'No!' });
  assert(sql, "select users.json,EXISTS(select 1 from moderators where moderators.id = <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>1</mn><mo stretchy="false">)</mo><mi>a</mi><mi>s</mi><mi>i</mi><msub><mi>s</mi><mi>m</mi></msub><mi>o</mi><mi>d</mi><mi>e</mi><mi>r</mi><mi>a</mi><mi>t</mi><mi>o</mi><mi>r</mi><mi>f</mi><mi>r</mi><mi>o</mi><mi>m</mi><mi>u</mi><mi>s</mi><mi>e</mi><mi>r</mi><mi>s</mi><mi>w</mi><mi>h</mi><mi>e</mi><mi>r</mi><mi>e</mi><mi>u</mi><mi>s</mi><mi>e</mi><mi>r</mi><mi>s</mi><mi mathvariant="normal">.</mi><mi>i</mi><mi>d</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">1) as is_moderator from users where users.id = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">1</span><span class="mclose">)</span><span class="mord mathnormal">a</span><span class="mord mathnormal">s</span><span class="mord mathnormal">i</span><span class="mord"><span class="mord mathnormal">s</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">m</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">ro</span><span class="mord mathnormal">m</span><span class="mord mathnormal">u</span><span class="mord mathnormal">sers</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">h</span><span class="mord mathnormal">ere</span><span class="mord mathnormal">u</span><span class="mord mathnormal">sers</span><span class="mord">.</span><span class="mord mathnormal">i</span><span class="mord mathnormal">d</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>1 and users.status = <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>2</mn><mi>a</mi><mi>n</mi><mi>d</mi><mi>u</mi><mi>s</mi><mi>e</mi><mi>r</mi><mi>s</mi><mi mathvariant="normal">.</mi><mi>c</mi><mi>o</mi><mi>m</mi><mi>p</mi><mi>l</mi><mi>e</mi><mi>t</mi><msub><mi>e</mi><mi>s</mi></msub><mi>t</mi><mi>a</mi><mi>t</mi><mi>u</mi><mi>s</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">2 and users.complete_status = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord">2</span><span class="mord mathnormal">an</span><span class="mord mathnormal">d</span><span class="mord mathnormal">u</span><span class="mord mathnormal">sers</span><span class="mord">.</span><span class="mord mathnormal">co</span><span class="mord mathnormal">m</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">e</span><span class="mord mathnormal">t</span><span class="mord"><span class="mord mathnormal">e</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">s</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">t</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">u</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>3");
  assertEquals(args, [ 123, 'Yes!', 'No!' ]);
});

credits

parser is based on @mscdex code of his excellent node-mariasql library