JavaScript数据库TaffyDB用法实例分析

前端技术 2023/09/03 JavaScript

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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