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74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
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// MySQL Query Compiler
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// ------
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var inherits = require('inherits')
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var QueryCompiler = require('../../../query/compiler')
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var assign = require('lodash/object/assign');
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function QueryCompiler_MySQL(client, builder) {
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QueryCompiler.call(this, client, builder)
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}
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inherits(QueryCompiler_MySQL, QueryCompiler)
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assign(QueryCompiler_MySQL.prototype, {
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_emptyInsertValue: '() values ()',
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// Update method, including joins, wheres, order & limits.
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update: function() {
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var join = this.join();
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var updates = this._prepUpdate(this.single.update);
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var where = this.where();
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var order = this.order();
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var limit = this.limit();
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return 'update ' + this.tableName +
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(join ? ' ' + join : '') +
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' set ' + updates.join(', ') +
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(where ? ' ' + where : '') +
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(order ? ' ' + order : '') +
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(limit ? ' ' + limit : '');
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},
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forUpdate: function() {
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return 'for update';
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},
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forShare: function() {
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return 'lock in share mode';
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},
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// Compiles a `columnInfo` query.
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columnInfo: function() {
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var column = this.single.columnInfo;
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return {
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sql: 'select * from information_schema.columns where table_name = ? and table_schema = ?',
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bindings: [this.single.table, this.client.database()],
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output: function(resp) {
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var out = resp.reduce(function(columns, val) {
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columns[val.COLUMN_NAME] = {
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defaultValue: val.COLUMN_DEFAULT,
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type: val.DATA_TYPE,
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maxLength: val.CHARACTER_MAXIMUM_LENGTH,
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nullable: (val.IS_NULLABLE === 'YES')
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};
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return columns
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}, {})
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return column && out[column] || out;
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}
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};
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},
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limit: function() {
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var noLimit = !this.single.limit && this.single.limit !== 0;
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if (noLimit && !this.single.offset) return '';
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// Workaround for offset only, see http://stackoverflow.com/questions/255517/mysql-offset-infinite-rows
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return 'limit ' + ((this.single.offset && noLimit) ? '18446744073709551615' : this.formatter.parameter(this.single.limit));
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}
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})
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// Set the QueryBuilder & QueryCompiler on the client object,
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// incase anyone wants to modify things to suit their own purposes.
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module.exports = QueryCompiler_MySQL;
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