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:
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.