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JavaScript數(shù)據(jù)庫TaffyDB用法實(shí)例分析

 更新時(shí)間：2015年07月27日 12:06:20   作者：紅薯  
這篇文章主要介紹了JavaScript數(shù)據(jù)庫TaffyDB用法,實(shí)例分析了TaffyDB數(shù)據(jù)庫的定義、查詢、更新、刪除等操作的相關(guān)使用技巧,具有一定參考借鑒價(jià)值,需要的朋友可以參考下

本文實(shí)例講述了JavaScript數(shù)據(jù)庫TaffyDB用法。分享給大家供大家參考。具體如下：

TaffyDB 是一個(gè)免費(fèi)開源的 JavaScript 庫，用于在 Web 上實(shí)現(xiàn)一個(gè)輕量級(jí)的數(shù)據(jù)訪問層，也就是一個(gè)簡(jiǎn)單的數(shù)據(jù)庫。

數(shù)據(jù)定義：

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"]}
 ]
)

查詢：

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"}
    )
  );

插入數(shù)據(jù)：

//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"]
  });

刪除：

復(fù)制代碼 代碼如下:
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"}}
);

希望本文所述對(duì)大家的javascript程序設(shè)計(jì)有所幫助。

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