VALUES () tables, RETURNING and export select_builder
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// Простенький "селект билдер" по мотивам MediaWiki-овского, успешно юзаю подобный в PHP уже лет 8
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// (c) Виталий Филиппов, 2019
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// Версия 2019-05-08
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// В PHP, правда, прикольнее - там в массиве можно смешивать строковые и численные ключи,
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// благодаря чему можно писать $where = [ 't1.a=t2.a', 't2.b' => [ 1, 2, 3 ] ]
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@ -21,7 +22,7 @@ const MS_ROW = 2;
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const MS_COL = 4;
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const MS_VALUE = 6;
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function selectBuilder(tables, fields, where, options)
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function select_builder(tables, fields, where, options)
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{
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let sql = 'SELECT ', bind = [];
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if (fields instanceof Array)
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@ -66,8 +67,25 @@ function selectBuilder(tables, fields, where, options)
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}
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else
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{
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sql += ' ' + tables[k][0].toUpperCase() + ' JOIN ';
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let t = tables[k][1];
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if (t instanceof Pg_Values)
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{
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sql += '(VALUES ';
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let i = 0;
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for (const row of t.rows)
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{
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sql += (i > 0 ? ', (' : '(') + t.keys.map(() => '$'+(++i)).join(', ')+')';
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bind.push.apply(bind, t.keys.map(k => row[k]));
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}
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sql += ') AS '+k+'('+t.keys.join(', ')+')';
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}
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else
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{
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sql += t + ' ' + k;
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}
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const on = whereBuilder(tables[k][2]);
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sql += ' ' + tables[k][0].toUpperCase() + ' JOIN ' + tables[k][1] + ' ' + k + ' ON ' + (on[0] || '1=1');
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sql += ' ON ' + (on[0] || '1=1');
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bind.push.apply(bind, on[1]);
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}
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}
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@ -172,7 +190,7 @@ function _inline(sql, bind)
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// dbh = node-postgres.Client
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async function select(dbh, tables, fields, where, options, format)
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{
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let [ sql, bind ] = selectBuilder(tables, fields, where, options);
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let [ sql, bind ] = select_builder(tables, fields, where, options);
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//console.log(_inline(sql, bind));
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let data = await dbh.query(_positional(sql), bind);
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if ((format & MS_LIST) || (format & MS_COL))
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@ -186,7 +204,7 @@ async function select(dbh, tables, fields, where, options, format)
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return data;
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}
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async function insert(dbh, table, rows)
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async function insert(dbh, table, rows, options)
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{
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if (!(rows instanceof Array))
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{
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@ -205,8 +223,16 @@ async function insert(dbh, table, rows)
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sql += (i > 0 ? ', (' : '(') + keys.map(() => '$'+(++i)).join(', ')+')';
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bind.push.apply(bind, keys.map(k => row[k]));
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}
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if (options.returning)
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{
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sql += ' returning '+options.returning;
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return (await dbh.query(sql, bind)).rows;
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}
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else
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{
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return await dbh.query(sql, bind);
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}
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}
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async function _delete(dbh, table, where)
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{
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@ -224,11 +250,27 @@ async function update(dbh, table, set, where)
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return await dbh.execute(_positional(sql), bind);
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}
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function values(rows)
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{
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return new Pg_Values(Object.keys(rows[0]), rows);
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}
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class Pg_Values
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{
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constructor(keys, rows)
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{
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this.keys = keys;
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this.rows = rows;
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}
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}
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module.exports = {
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select_builder,
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select,
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insert,
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delete: _delete,
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update,
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values,
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MS_HASH,
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MS_LIST,
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MS_ROW,
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