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。
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