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：

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。