JavaScriptデータベース TaffyDB利用例 分析_JavaScriptスキル

この記事の例では、JavaScript データベース TaffyDB の使用法について説明します。皆さんの参考に共有してください。詳細は以下の通りです。

TaffyDB は、Web 上に軽量のデータ アクセス層、つまり単純なデータベースを実装するために使用される無料のオープンソース JavaScript ライブラリです。

データ定義:

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"]}
 ]
)

クエリ:

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"}
    )
  );

データを挿入:

//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"]
  });

削除:

コードをコピーします コードは次のとおりです:

friends.remove({name: "Brian"});

並べ替え:

friends.orderBy(["age",{"name":"desc"}]);
var keys = new TAFFY([
{name:"12abc"},
{name:"abc343"},
{name:"1abc"},
{name:"23abc"}
]);
keys.orderBy({name:"logical"});

各用途:

friends.forEach(function (f,n) {alert(f.name)});
friends.forEach(
  function (f,n) {alert(f.name);},
  {favorite_foods:{has:"pizza"}}
);

この記事が皆様の JavaScript プログラミング設計に役立つことを願っています。