JavaScript数据库TaffyDB用法实例分析

本文实例讲述了JavaScript数据库TaffyDB用法。分享给大家供大家参考。具体如下：
TaffyDB 是一个免费开源的 JavaScript 库，用于在 Web 上实现一个轻量级的数据访问层，也就是一个简单的数据库。
数据定义：

var friends = new TAFFY（[{name:"Bob", gender:"M", married:"No", age:25, state:"NY", favorite_foods:["pizza","tacos"]}, {name:"Joyce", gender:"F", married:"No", age:29, state:"WA", favorite_foods:["salad","cheese sticks"]}, {name:"Dan", gender:"M", married:"No", age:29, state:"MT", favorite_foods:["pizza","hamburgers","BLTs"]}, {name:"Sarah", gender:"F", married:"No", age:21, state:"ID", favorite_foods:["pizza","sushi"]} ]）

查询：

friends.find（{age:{greaterthan:22}}）;friends.find（{state:["WA","MT","ID"]}）;friends.find（{state:["WA","MT","ID"], age:{greaterthan:22}}）;

更新操作：

friends.update（{state:"CA",married:"Yes"},{name:"Joyce"}）;friends.update（{state:"CA",married:"Yes"},1）;friends.update（{state:"CA",married:"Yes"},friends.find（{name:"Joyce"}））;

插入数据：

//Inserting is simple and works as you would expect:friends.insert（{name:"Brian",gender:"M",married:"No",age:52,state:"FL",favorite_foods:["fruit","steak"]}）;

删除：
复制代码代码如下:friends.remove（{name:"Brian"}）;
排序：

friends.orderBy（["age",{"name":"desc"}]）;var keys = new TAFFY（[{name:"12abc"},{name:"abc343"},{name:"1abc"},{name:"23abc"}]）;keys.orderBy（{name:"logical"}）;

forEach用法：

friends.forEach（function （f,n） {alert（f.name）}）;friends.forEach（function （f,n） {alert（f.name）;},{favorite_foods:{has:"pizza"}}）;

希望本文所述对大家的javascript程序设计有所帮助。