alasql/src/426orderby.js

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

yy.Select.prototype.compileOrder = function (query) {
	var self = this;
	if(this.order) {
//			console.log(990, this.order);
		if(this.order && this.order.length == 1 && this.order[0].expression 
			 && typeof this.order[0].expression == "function") {
//			console.log(991, this.order[0]);
			var func = this.order[0].expression;
//			console.log(994, func);
			return function(a,b){
				var ra = func(a),rb = func(b);
				if(ra>rb) return 1;
				if(ra==rb) return 0;
				return -1;
			}
		};

		var s = '';
		var sk = '';
		this.order.forEach(function(ord,idx){
			// console.log(ord instanceof yy.Expression);
			// console.log(ord.toJavaScript('a',''));
			// console.log(ord.expression instanceof yy.Column);
			
			// Date conversion
			var dg = ''; 
//console.log(ord.expression, ord.expression instanceof yy.NumValue);
			if(ord.expression instanceof yy.NumValue) {
				ord.expression = self.columns[ord.expression.value-1];
			};

			if(ord.expression instanceof yy.Column) {
				var columnid = ord.expression.columnid; 
				if(query.xcolumns[columnid]) {
					var dbtypeid = query.xcolumns[columnid].dbtypeid;
					if( dbtypeid == 'DATE' || dbtypeid == 'DATETIME') dg = '.valueOf()';
					// TODO Add other types mapping
				} else {
					if(alasql.options.valueof) dg = '.valueOf()'; // TODO Check
				}
				// COLLATE NOCASE
				if(ord.nocase) dg += '.toUpperCase()';

				s += 'if((a[\''+columnid+"']||'')"+dg+(ord.direction == 'ASC'?'>':'<')+'(b[\''+columnid+"']||'')"+dg+')return 1;';
				s += 'if((a[\''+columnid+"']||'')"+dg+'==(b[\''+columnid+"']||'')"+dg+'){';

			} else {
				dg = '.valueOf()';
				// COLLATE NOCASE
				if(ord.nocase) dg += '.toUpperCase()';
				s += 'if(('+ord.toJavaScript('a','')+"||'')"+dg+(ord.direction == 'ASC'?'>(':'<(')+ord.toJavaScript('b','')+"||'')"+dg+')return 1;';
				s += 'if(('+ord.toJavaScript('a','')+"||'')"+dg+'==('+ord.toJavaScript('b','')+"||'')"+dg+'){';
			}			

//			if(columnid == '_') {
//				s += 'if(a'+dg+(ord.direction == 'ASC'?'>':'<')+'b'+dg+')return 1;';
//				s += 'if(a'+dg+'==b'+dg+'){';
//			} else {
			// TODO Add date comparision
				// s += 'if(a[\''+columnid+"']"+dg+(ord.direction == 'ASC'?'>':'<')+'b[\''+columnid+"']"+dg+')return 1;';
				// s += 'if(a[\''+columnid+"']"+dg+'==b[\''+columnid+"']"+dg+'){';
//			}
			sk += '}';
		});
		s += 'return 0;';
		s += sk+'return -1';
		query.orderfns = s;
//console.log(s);
		return new Function('a,b',s);
	};
};