alasql/src/79set.js

AlaSQL.js - JavaScript SQL database library for relational and graph data manipulation with support of localStorage, IndexedDB, and Excel

/*
//
// SET for Alasql.js
// Date: 01.12.2014
// (c) 2014, Andrey Gershun
//
*/

yy.SetVariable = function (params) { return yy.extend(this, params); }
yy.SetVariable.prototype.toString = function() {
	var s = K('SET')+' ';
	if(typeof this.value != 'undefined') s += K(this.variable.toUpperCase())+' '+(this.value?'ON':'OFF');
	if(this.expression) s += '@' + L(this.variable)+' = '+this.expression.toString();
	return s;
}

yy.SetVariable.prototype.execute = function (databaseid,params,cb) {
//	console.log(this);
	if(typeof this.value != 'undefined') {
		var val = this.value;
		if(val == 'ON') val = true;
		else if(val == 'OFF') val = false;
		alasql.options[this.variable] = val;
	} else if(this.expression) {

		if(this.exists) {
			this.existsfn = this.exists.map(function(ex) {
				var nq = ex.compile(databaseid);
				if(nq.query && !nq.query.modifier) nq.query.modifier='ARRAY';
				return nq;
//				return ex.compile(databaseid);
				// TODO Include modifier
			});
		}
		if(this.queries) {
			this.queriesfn = this.queries.map(function(q) {
				var nq = q.compile(databaseid);
				if(nq.query && !nq.query.modifier) nq.query.modifier='ARRAY';
				return nq;
				// TODO Include modifier
			});		
		}

//		console.log(this.expression.toJavaScript('','', null));
		var res = new Function("params,alasql","return "
			+this.expression.toJavaScript('({})','', null)).bind(this)(params,alasql);
		if(alasql.declares[this.variable]) {
			res = alasql.stdfn.CONVERT(res,alasql.declares[this.variable]);
		}
		if(this.props && this.props.length > 0) {
			var fs = 'alasql.vars[\''+this.variable+'\']';
			fs += this.props.map(function(prop){
				if(typeof prop == 'string') {
					return '[\''+prop+'\']';
				} else if(typeof prop == 'number') {
					return '['+prop+']';
				} else {
					// console.log('prop:',prop, prop.toJavaScript());
					return '['+prop.toJavaScript()+']';
//				} else {
//					console.log(prop, typeof );
//					throw new Error('Wrong SET property');
				}
			}).join();
//				console.log(fs);
			new Function("value,alasql",fs +'=value')(res,alasql);
		} else {
			alasql.vars[this.variable] = res;
		}
	}
	var res = 1;
	if(cb) res=cb(res);
	return res;
};