HTML5之indexedDB

var dbName = "myDB";
var tdbName = "student";
function openDB(dbname,version){
    version = version || 1;

    var request = getIndexedDB().open([dbName],version);
    request.onerror=function(e){
        console.log("打开数据库失败");
    }
    request.onsuccess=function(e){
        console.log("打开数据库成功");
        db = e.target.result;
    }
    request.onupgradeneeded=function(e){
        db = e.target.result;
        if(!db.objectStoreNames.contains('student')){
            db.createObjectStore(['student'],{keyPath:"name"});
            console.log("创建表student");
        }
    }
}
function writeInDB(dbName,tdbName,objValue){
    var transaction = dbName.transaction(tdbName,"readwrite");
    var objectStore = transaction.objectStore(tdbName);
    var addrequest;
    for(var i in objValue){
        addrequest = objectStore.add(objValue[i]);
    }
    addrequest.onerror=function(e){
        console.log("插入数据失败");
    }
    addrequest.onsuccess=function(e){
        console.log("插入数据成功");
    }
}
var db = openDB(dbName);
var stud = [{name:'Li',age:20},{name:'Zhao',age:12}];

function readFromDB(db,tdbName){
    var store = db.transaction(tdbName,"readwrite").objectStore(tdbName);
    store.openCursor().onsuccess=function(e){
        var cursor = e.target.result;
        if(cursor){
            console.log(cursor.key);
            console.log(cursor.value);
            cursor.continue();    
        }
    }
}

function removeFromDB(db,tdbName,key){
    var store = db.transaction(tdbName,"readwrite").objectStore(tdbName);
    store.delete(key);
}

readFromDB(db,tdbName);//读取数据
removeFromDB(db,tdbName,'Li');//移出key为"Li"的数据
writeInDB(db,tdbName,[{name:"Li",age:22,sex:1}]);
writeInDB(db,tdbName,[{name:"Lilly",age:22,sex:1}]);//插入两条记录