JavaScript-Datenbank TaffyDB-Nutzungsbeispiel, Analyse_Javascript-Kenntnisse

Das Beispiel in diesem Artikel beschreibt die Verwendung der JavaScript-Datenbank TaffyDB. Teilen Sie es als Referenz mit allen. Die Details lauten wie folgt:

TaffyDB ist eine kostenlose Open-Source-JavaScript-Bibliothek, die zur Implementierung einer schlanken Datenzugriffsschicht im Web, also einer einfachen Datenbank, verwendet wird.

Datendefinition:

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"]}
 ]
)

Abfrage:

friends.find({age:{greaterthan:22}});
friends.find({state:["WA","MT","ID"]});
friends.find({state:["WA","MT","ID"],
       age:{greaterthan:22}});

Aktualisierungsvorgang:

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"}
    )
  );

Daten einfügen:

//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"]
  });

Löschen:

Code kopieren Der Code lautet wie folgt:

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

Sortieren:

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

für jede Verwendung:

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

Ich hoffe, dass dieser Artikel für das JavaScript-Programmierdesign aller hilfreich sein wird.