alasql/src/41exists.js

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

/*
//
// EXISTS and other subqueries functions  functions for Alasql.js
// Date: 03.11.2014
// (c) 2014, Andrey Gershun
//
*/

yy.ExistsValue = function(params) { return yy.extend(this, params); }
yy.ExistsValue.prototype.toString = function() {
	return 'EXISTS('+this.value.toString()+')';
};

yy.ExistsValue.prototype.toType = function() {
	return 'boolean';
};

yy.ExistsValue.prototype.toJavaScript = function(context,tableid,defcols) {
//	return 'ww=this.existsfn['+this.existsidx+'](params,null,p),console.log(ww),ww.length';
	
	return 'this.existsfn['+this.existsidx+'](params,null,'+context+').length';
};

yy.Select.prototype.compileWhereExists = function(query) {
	if(!this.exists) return;
	query.existsfn = this.exists.map(function(ex) {
		var nq = ex.compile(query.database.databaseid);
//		console.log(nq);
		 if(!nq.query.modifier) nq.query.modifier = 'ARRAY';
		 return nq;
	});
};

yy.Select.prototype.compileQueries = function(query) {
	if(!this.queries) return;
	query.queriesfn = this.queries.map(function(q) {
		 var nq = q.compile(query.database.databaseid);
//		console.log(nq);
//		 nq.query.modifier = undefined;
		 return nq;
	});
};

//
// Prepare subqueries and exists
//
alasql.precompile = function(statement,databaseid,params){
//	console.log(statement);
	if(!statement) return;
	statement.params = params;
	if(statement.queries) {	
//console.log(52,statement.queries[0]);
		statement.queriesfn = statement.queries.map(function(q) {
			var nq = q.compile(databaseid || statement.database.databaseid);
//			console.log(nq);
//			 nq.query.modifier = undefined;
			 return nq;

		});
	}
	if(statement.exists) {
//console.log(62,statement.exists);
		statement.existsfn = statement.exists.map(function(ex) {
			var nq = ex.compile(databaseid || statement.database.databaseid);
//			console.log(nq.query.modifier);
			 if(!nq.query.modifier) nq.query.modifier = 'ARRAY';
			 return nq;

		});
	};
}