// SQLite3: Column Builder & Compiler // ------- const SchemaCompiler = require('../../../schema/compiler'); const some = require('lodash/some'); // Schema Compiler // ------- class SchemaCompiler_SQLite3 extends SchemaCompiler { constructor() { super(...arguments); } // Compile the query to determine if a table exists. hasTable(tableName) { const sql = `select * from sqlite_master ` + `where type = 'table' and name = ${this.formatter.parameter(tableName)}`; this.pushQuery({ sql, output: (resp) => resp.length > 0 }); } // Compile the query to determine if a column exists. hasColumn(tableName, column) { this.pushQuery({ sql: `PRAGMA table_info(${this.formatter.wrap(tableName)})`, output(resp) { return some(resp, (col) => { return ( this.client.wrapIdentifier(col.name.toLowerCase()) === this.client.wrapIdentifier(column.toLowerCase()) ); }); }, }); } // Compile a rename table command. renameTable(from, to) { this.pushQuery( `alter table ${this.formatter.wrap(from)} rename to ${this.formatter.wrap( to )}` ); } } module.exports = SchemaCompiler_SQLite3;