execute(databaseid, params, cb) {
			if (this.expression) {
				alasql.precompile(this, databaseid, params); // Precompile queries
				var exprfn = new Function(
					'params,alasql,p',
					'var y;return ' + this.expression.toJS('({})', '', null)
				).bind(this);
				var res = exprfn(params, alasql);
				if (cb) {
					res = cb(res);
				}
				return res;
			}
		}
Execute statement
			@param {string} databaseid Database identificatro
			@param {object} params Statement parameters
			@param {statement-callback} cb Callback
			@return {object} Result value