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I experimented with custom collations to match JS sort order, but 5x slower

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jeremy@jermolene.com 2023-06-30 10:46:27 +01:00
parent b29af447e5
commit 1f4be3e92f
1 changed files with 21 additions and 0 deletions
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21
plugins/tiddlywiki/sqlite3store/sql-functions.js
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@ -14,6 +14,27 @@ $tw.SqlFunctions = function(options) {
options = options || {};
var self = this;
this.db = new $tw.sqlite3.oo1.DB("/tiddlywiki.sqlite3","c");
// Setup custom collation to precisely match existing sort orders
// Create field with `title TEXT NOT NULL COLLATE custom_collation`
// Use it like `... order by shadow collate custom_collation`
// function customCollation(ptr,lenA,a,lenB,b) {
// var jsA = $tw.sqlite3.wasm.cstrToJs(a).slice(0,lenA),
// jsB = $tw.sqlite3.wasm.cstrToJs(b).slice(0,lenB);
// if(jsA < jsB) {
// return -1;
// } else if (jsA > jsB) {
// return +1;
// } else {
// return 0;
// }
// }
// var SQLITE_UTF8 = 1; /* IMP: R-37514-35566 */
// var SQLITE_UTF16LE = 2; /* IMP: R-03371-37637 */
// var SQLITE_UTF16BE = 3; /* IMP: R-51971-34154 */
// var SQLITE_UTF16 = 4; /* Use native byte order */
// var SQLITE_ANY = 5; /* Deprecated */
// var SQLITE_UTF16_ALIGNED = 8; /* sqlite3_create_collation only */
// var collationResult = $tw.sqlite3.capi.sqlite3_create_collation_v2(this.db.pointer,"custom_collation",SQLITE_UTF8,this,customCollation,0);
/*
Create tables and indexes
*/