alasql/src/76usedatabase.js

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

/*
//
// UPDATE for Alasql.js
// Date: 03.11.2014
// Modified: 16.11.2014
// (c) 2014, Andrey Gershun
//
*/

// CREATE DATABASE databaseid
yy.CreateDatabase = function (params) { return yy.extend(this, params); };
yy.CreateDatabase.prototype.toString = function() {
	var s = K('CREATE'); 
	if(this.engineid) s+=' '+L(this.engineid);
	s += ' '+K('DATABASE');
	if(this.ifnotexists) s += ' '+K('IF')+' '+K('NOT')+' '+K('EXISTS');
	s += ' '+L(this.databaseid);
	if(this.args && this.args.length > 0) { 
		s += '('+this.args.map(function(arg){ return arg.toString()}).join(', ')+')';
	}
	if(this.as) s += ' '+K('AS')+' '+L(this.as);
	return s;
}
//yy.CreateDatabase.prototype.compile = returnUndefined;
yy.CreateDatabase.prototype.execute = function (databaseid, params, cb) {
	// console.log(alasql.useid, databaseid, this.databaseid);
	// console.trace();
	var args;
	if(this.args && this.args.length > 0) {
		args = this.args.map(function(arg){
			return new Function('params','return '+arg.toJavaScript())(params);
		});
	};
	if(this.engineid) {
		var res = alasql.engines[this.engineid].createDatabase(this.databaseid, this.args, this.ifnotexists, this.as, cb);
		return res;
	} else {
		var dbid = this.databaseid;
		if(alasql.databases[dbid]) {
			throw new Error("Database '"+dbid+"' already exists")
		};
		var a = new alasql.Database(dbid);
		var res = 1;
		if(cb) return cb(res);
		return res;
	}
};

// CREATE DATABASE databaseid
yy.AttachDatabase = function (params) { return yy.extend(this, params); };
yy.AttachDatabase.prototype.toString = function() {
	var s = K('ATTACH');
	if(this.engineid) s += ' '+L(this.engineid);
	s += ' '+K('DATABASE')+' '+L(this.databaseid);
	// TODO add params
	if(args) {
		s += '(';
			if(args.length>0) {
				s += args.map(function(arg){ return arg.toString(); }).join(', ');
			}
		s += ')';
	}
	if(this.as) s+= ' '+K('AS')+' '+L(this.as);
	return s;
}
//yy.CreateDatabase.prototype.compile = returnUndefined;
yy.AttachDatabase.prototype.execute = function (databaseid, params, cb) {
	// console.log(alasql.useid, databaseid, this.databaseid);
	// console.trace();
	if(!alasql.engines[this.engineid]) {
		throw new Error('Engine "'+this.engineid+'" is not defined.');
	};
	var res = alasql.engines[this.engineid].attachDatabase(this.databaseid, this.as, this.args, params, cb);
	return res;
};


// CREATE DATABASE databaseid
yy.DetachDatabase = function (params) { return yy.extend(this, params); };
yy.DetachDatabase.prototype.toString = function() {
	var s = K('DETACH');
	s += ' '+K('DATABASE')+' '+L(this.databaseid);
	return s;
}
//yy.CreateDatabase.prototype.compile = returnUndefined;
yy.DetachDatabase.prototype.execute = function (databaseid, params, cb) {
	// console.log(alasql.useid, databaseid, this.databaseid);
	// console.trace();
	if(!alasql.databases[this.databaseid].engineid) {
		throw new Error('Cannot detach database "'+this.engineid+'", because it was not attached.');
	};
	var res;
	
	var dbid = this.databaseid;

	if(dbid == alasql.DEFAULTDATABASEID) {
		throw new Error("Drop of default database is prohibited");			
	}
//	console.log(dbid);
	if(!alasql.databases[dbid]) {
		if(!this.ifexists) {
			throw new Error("Database '"+dbid+"' does not exist");	
		} else {
			res = 0;
		}
	} else {
		delete alasql.databases[dbid];
		if(dbid == alasql.useid) {
			alasql.use();		
		}
		res = 1;
	}
	if(cb) cb(res);
	return res;
//	var res = alasql.engines[this.engineid].attachDatabase(this.databaseid, this.as, cb);
//	return res;
};

// USE DATABSE databaseid
// USE databaseid
yy.UseDatabase = function (params) { return yy.extend(this, params); };
yy.UseDatabase.prototype.toString = function() {
	return K('USE') +' '+K('DATABASE')+' '+L(this.databaseid);
}
//yy.UseDatabase.prototype.compile = returnUndefined;
yy.UseDatabase.prototype.execute = function (databaseid, params, cb) {
	var dbid = this.databaseid;
	if(!alasql.databases[dbid]) {
		throw new Error("Database '"+dbid+"' does not exist")
	};
	alasql.use(dbid);
	var res = 1;
	if(cb) cb(res);
	return res;
};

// DROP DATABASE databaseid
yy.DropDatabase = function (params) { return yy.extend(this, params); }
yy.DropDatabase.prototype.toString = function() {
	var s = K('DROP');
	if(this.ifexists) s += ' '+K('IF')+' '+K('EXISTS');
	s += ' '+K('DATABASE')+' '+L(this.databaseid);
	return s;
}
//yy.DropDatabase.prototype.compile = returnUndefined;
yy.DropDatabase.prototype.execute = function (databaseid, params, cb) {
	if(this.engineid) {

//		console.log(this,this.databaseid, this.ifexists);
		return alasql.engines[this.engineid].dropDatabase(this.databaseid, this.ifexists, cb);
	}
	var res;
	
	var dbid = this.databaseid;

	if(dbid == alasql.DEFAULTDATABASEID) {
		throw new Error("Drop of default database is prohibited");			
	}
//	console.log(dbid);
	if(!alasql.databases[dbid]) {
		if(!this.ifexists) {
			throw new Error("Database '"+dbid+"' does not exist");	
		} else {
			res = 0;
		}
	} else {
		if(alasql.databases[dbid].engineid) {
			throw new Error("Cannot drop database '"+dbid+"', because it is attached. Detach it.");	
		}

		delete alasql.databases[dbid];
		if(dbid == alasql.useid) {
			alasql.use();		
		}
		res = 1;
	}
	if(cb) cb(res);
	return res;
};