added benchmarks for creating prepared statements

Author: Joshua Wise

benchmark/trials/0.prepare.js

@@ -0,0 +1,4 @@
+'use strict';
+require('../get-db')('real-world', function (ourDb, theirDb) {
+	require('../types/prepare')(ourDb, theirDb, 100000);
+});

benchmark/types/prepare.js

@@ -0,0 +1,54 @@
+'use strict';
+
+exports = module.exports = function (ourDb, theirDb, count) {	
+	function callback0() {
+		global.gc();
+		ourTest(ourDb, count, callback1);
+	}
+	function callback1() {
+		global.gc();
+		theirTest(theirDb, count, callback2);
+	}
+	function callback2() {
+		var closedCount = 0;
+		ourDb.on('close', closed).close();
+		theirDb.close(closed);
+		function closed() {
+			++closedCount === 2 && process.exit();
+		}
+	}
+	setTimeout(callback0, 100);
+};
+
+exports.data = undefined;
+
+function ourTest(db, count, done) {
+	var t0 = process.hrtime();
+	for (var i=0; i<count; ++i) {
+		exports.data = db.prepare('SELECT * FROM entries');
+	}
+	var td = process.hrtime(t0);
+	report('better-sqlite3', count, td);
+	done();
+}
+function theirTest(db, count, done) {
+	var completed = 0;
+	var t0 = process.hrtime();
+	for (var i=0; i<count; ++i) {
+		db.prepare('SELECT * FROM entries', callback);
+	}
+	function callback(err, data) {
+		exports.data = data;
+		if (err) {throw err;}
+		if (++completed === count) {
+			var td = process.hrtime(t0);
+			report('node-sqlite3', count, td);
+			done();
+		}
+	}
+}
+
+function report(name, count, time) {
+	var ms = time[0] * 1000 + Math.round(time[1] / 1000000);
+	console.log(name + '\t' + count + ' prepared statements in ' + ms + 'ms');
+}