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。