alasql/src/420from.js

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

/*
//
// Select compiler part for Alasql.js
// Date: 03.11.2014
// (c) 2014, Andrey Gershun
//
*/

yy.Select.prototype.compileFrom = function(query) {
//	console.log(1);
	var self = this;
	query.sources = [];
//	var tableid = this.from[0].tableid;
//	var as = '';
//	if(self.from[0].as) as = this.from[0].as;
//console.log(this);
	query.aliases = {};
	if(!self.from) return;

//console.log(self.from);

	self.from.forEach(function(tq){
		//console.log(tq);

		var alias = tq.as || tq.tableid;
//		console.log(alias);
		if(tq instanceof yy.Table) {
//			console.log(tq, tq.databaseid, query);
			query.aliases[alias] = {tableid: tq.tableid, databaseid: tq.databaseid || query.database.databaseid, type:'table'};
		} else if(tq instanceof yy.Select) {
			query.aliases[alias] = {type:'subquery'};
		} else if(tq instanceof yy.Search) {
			query.aliases[alias] = {type:'subsearch'};
		} else if(tq instanceof yy.ParamValue) {
			query.aliases[alias] = {type:'paramvalue'};
		} else if(tq instanceof yy.FuncValue) {
			query.aliases[alias] = {type:'funcvalue'};
		} else if(tq instanceof yy.VarValue) {
			query.aliases[alias] = {type:'varvalue'};
		} else if(tq instanceof yy.FromData) {
			query.aliases[alias] = {type:'fromdata'};
		} else {
			throw new Error('Wrong table at FROM');
		}

		var source = {
			alias: alias,
			databaseid: tq.databaseid || query.database.databaseid,
			tableid: tq.tableid,
			joinmode: 'INNER',
			onmiddlefn: returnTrue,			
			srcwherefns: '',	// for optimization
			srcwherefn: returnTrue,
//			columns: []			
		};

		if(tq instanceof yy.Table) {
			// Get columns from table
			source.columns = alasql.databases[source.databaseid].tables[source.tableid].columns;
//			console.log('test',alasql.options.autocommit);
//				console.log(997,alasql.databases[source.databaseid].engineid);
// console.log(0,source.databaseid);
// console.log(1,alasql.databases[source.databaseid]);
// console.log(2,alasql.databases[source.databaseid].tables[source.tableid].view);
			if(alasql.options.autocommit && alasql.databases[source.databaseid].engineid) {
//				console.log(997,alasql.databases[source.databaseid].engineid);
// TODO -- make view for external engine
				source.datafn = function(query,params,cb,idx, alasql) {
					return alasql.engines[alasql.databases[source.databaseid].engineid].fromTable(
						source.databaseid, source.tableid,cb,idx,query);
				}				
			} else if(alasql.databases[source.databaseid].tables[source.tableid].view){
				source.datafn = function(query,params,cb,idx, alasql) {
					var res = alasql.databases[source.databaseid].tables[source.tableid].select(params);
					if(cb) res = cb(res,idx,query);
					return res;
				}
			} else {
//				console.log('here');
//				console.log(420,72,alasql.databases[source.databaseid].tables[source.tableid]);
				source.datafn = function(query,params,cb,idx, alasql) {
				// if(!query) console.log('query');
				// if(!query.database) console.log('query');
				// if(!query.database.tables) console.log('query');
				// if(!source.tableid) console.log('query');
				// if(!query.database.tables[source.tableid]) console.log(query);
				// if(!query.database.tables[source.tableid].data) console.log('query');
					var res = alasql.databases[source.databaseid].tables[source.tableid].data;
//				console.log(500,res);
					if(cb) res = cb(res,idx,query);
//				console.log(600,res);
					return res;
//				return alasql.databases[source.databaseid].tables[source.tableid].data;
				};
			}
		} else if(tq instanceof yy.Select) {

			source.subquery = tq.compile(query.database.databaseid);
			if(typeof source.subquery.query.modifier == 'undefined') {
				source.subquery.query.modifier = 'RECORDSET'; // Subqueries always return recordsets
			}
			source.columns = source.subquery.query.columns;
//			console.log(101,source.columns);
//			tq.columns;

			source.datafn = function(query, params, cb, idx, alasql) {
//				return source.subquery(query.params, cb, idx, query);
				var res;
				source.subquery(query.params, function(data){
					res = data.data;
					if(cb) res = cb(res,idx,query);
					return res;
//					return data.data;
				});
//					console.log(515,res);
				return res;
			}						
		} else if(tq instanceof yy.Search) {

			 source.subsearch = tq;
			 source.columns = [];
			 //.compile(query.database.databaseid);
			// if(typeof source.subquery.query.modifier == 'undefined') {
			// 	source.subquery.query.modifier = 'RECORDSET'; // Subqueries always return recordsets
			// }
			// source.columns = source.subquery.query.columns;
//			console.log(101,source.columns);
//			tq.columns;

			source.datafn = function(query, params, cb, idx, alasql) {
//				return source.subquery(query.params, cb, idx, query);
				var res;
				source.subsearch.execute(query.database.databaseid,query.params,function(data){
					res = data;
					if(cb) res = cb(res,idx,query);
					return res;
//					return data.data;
				});
//					console.log(515,res);
				return res;
			}						
		} else if(tq instanceof yy.ParamValue) {

			var ps = "var res = alasql.prepareFromData(params['"+tq.param+"']";
//				console.log(tq);
			if(tq.array) ps+=",true";
			ps += ");if(cb)res=cb(res,idx,query);return res"
			source.datafn = new Function('query,params,cb,idx,alasql',ps);
		} else if(tq instanceof yy.VarValue) {
			var ps = "var res = alasql.prepareFromData(alasql.vars['"+tq.variable+"']";
//				console.log(tq);
			if(tq.array) ps+=",true";
			ps += ");if(cb)res=cb(res,idx,query);return res"
			source.datafn = new Function('query,params,cb,idx,alasql',ps);
		} else if(tq instanceof yy.FuncValue) {
			var s = "var res=alasql.from['"+tq.funcid.toUpperCase()+"'](";
			// if(tq.args && tq.args.length>0) {
			// 	s += tq.args.map(function(arg){
			// 		return arg.toJavaScript();
			// 	}).concat('cb,idx,query').join(',');
			// }
			// if(tq.args && tq.args.length>0) {
			// 	s += tq.args.map(function(arg){
			// 		return arg.toJavaScript();
			// 	}).concat().join(',');
			// }
			if(tq.args && tq.args.length>0) {
				if(tq.args[0]) {
					s += tq.args[0].toJavaScript('query.oldscope')+',';
				} else {
					s += 'null,';
				};
				if(tq.args[1]) {
					s += tq.args[1].toJavaScript('query.oldscope')+',';
				} else {
					s += 'null,';
				};
			} else {
				s += 'null,null,'
			}
			s += 'cb,idx,query';
			s += ');/*if(cb)res=cb(res,idx,query);*/return res';
//	console.log(s);
			source.datafn = new Function('query, params, cb, idx, alasql',s);

		} else if(tq instanceof yy.FromData) {
				source.datafn = function(query,params,cb,idx, alasql) {
					var res = tq.data;
					if(cb) res = cb(res,idx,query);
					return res;
				}				
		} else {
			throw new Error('Wrong table at FROM');
		}
//		source.data = alasql.databases[source.databaseid].tables[source.tableid].data;
		query.sources.push(source);

	});
	// TODO Add joins
	query.defaultTableid = query.sources[0].alias;
//console.log(query.defaultTableid);
};

alasql.prepareFromData = function(data,array) {
//console.log(177,data,array);
	var res = data;
	if(typeof data == "string") {
		res = data.split(/\r?\n/);
		if(array) {
			for(var i=0, ilen=res.length; i<ilen;i++) {
				res[i] = [res[i]];
			}
		}
	} else if(array) {
		res = [];
		for(var i=0, ilen=data.length; i<ilen;i++) {
			res.push([data[i]]);
		}
//		console.log(res);
	} else if(typeof data == 'object' && !(data instanceof Array)) {
//	} else if(typeof data == 'object' && !(typeof data.length == 'undefined')) {
		if(typeof Mongo != 'undefined' && typeof Mongo.Collection != 'undefined'
			&& data instanceof Mongo.Collection) {
			res = data.find().fetch();
		} else {
			res = [];
			for(var key in data) {
				if(data.hasOwnProperty(key)) res.push([key,data[key]]);
			};			
		}

//		console.log(res);
	};
//	console.log(typeof data);
	return res;
};