alasql/src/67withselect.js

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

/*
//
// WITH SELECT for Alasql.js
// Date: 11.01.2015
// (c) 2015, Andrey Gershun
//
*/


yy.WithSelect = function (params) { return yy.extend(this, params); }
yy.WithSelect.prototype.toString = function() {
	var s = K('WITH')+' ';
	s += this.withs.map(function(w){
		return L(w.name)+' '+K('AS')+' ('+w.select.toString()+')';
	}).join(',')+' ';
	s += this.select.toString();
	return s;
};

yy.WithSelect.prototype.execute = function (databaseid,params,cb) {
	var self = this;
	// Create temporary tables
	var savedTables = [];
	self.withs.forEach(function(w){
		savedTables.push(alasql.databases[databaseid].tables[w.name]);
		var tb = alasql.databases[databaseid].tables[w.name] = new Table({tableid:w.name});
		tb.data = w.select.execute(databaseid,params);
	});

	var res = 1;
	res = this.select.execute(databaseid,params,function(data){
		// Clear temporary tables
//		setTimeout(function(){
			self.withs.forEach(function(w,idx){
				if(savedTables[idx]) alasql.databases[databaseid].tables[w.name] = savedTables[idx] ;
				else delete alasql.databases[databaseid].tables[w.name];
			});			
//		},0);

		if(cb) data = cb(data);
		return data;
	});
	return res;
};

/*
// CREATE TABLE
//yy.CreateTable.prototype.compile = returnUndefined;
yy.CreateView.prototype.execute = function (databaseid) {
//	var self = this;
	var db = alasql.databases[this.view.databaseid || databaseid];
	var v = db.views[this.view.viewid] = new View();

//	console.log(databaseid);
//	console.log(db.databaseid,db.tables);
//	console.log(table);

	return 1;
};

yy.DropView = function (params) { return yy.extend(this, params); }
yy.DropView.prototype.toString = function() {
	var s = K('DROP')+' '+K('VIEW');
	s += ' '+this.view.toString();
	return s;
};

// CREATE TABLE
//yy.CreateTable.prototype.compile = returnUndefined;
yy.DropView.prototype.execute = function (databaseid) {
//	var self = this;
};

*/