<script type="text/javascript">
//打开数据库
function openDB(name,version){
var version = version || 1;
var request = window.indexedDB.open(name,version);
request.onerror = function(e){
console.log(e.currentTarget.error.message);
};
request.onsuccess = function(e){
myDB.db = e.target.result;
};
request.onupgradeneeded = function(e){
var db=e.target.result;
if(!db.objectStoreNames.contains('students')){
//db.createObjectStore('students',{keyPath:"id"});//以id为键存储数据 类似关联数组
//db.createObjectStore('students',{autoIncrement: true});//以自增数值为键 类似索引数组 //创建索引
var store=db.createObjectStore('students',{keyPath: 'id'});
store.createIndex('nameIndex','name',{unique:true});
store.createIndex('ageIndex','age',{unique:false});
}
console.log('DB version changed to ' + version);
};
}
//插入数据
function addData(db,storeName){
var transaction=db.transaction(storeName,'readwrite');
var store=transaction.objectStore(storeName); for(var i=0;i<students.length;i++){
store.add(students[i]);
}
}
//查找数据
function getDataByKey(db,storeName,value){
var transaction=db.transaction(storeName,'readwrite');
var store=transaction.objectStore(storeName);
var request=store.get(value);
request.onsuccess=function(e){
var student=e.target.result;
console.log(student.name);
};
}
//利用索引查找数据
function getDataByIndex(db,storeName){
var transaction=db.transaction(storeName);
var store=transaction.objectStore(storeName);
var index = store.index("nameIndex");
index.get('Byron').onsuccess=function(e){
var student=e.target.result;
console.log(student.id);
}
}
//更新数据
function updateDataByKey(db,storeName,value){
var transaction=db.transaction(storeName,'readwrite');
var store=transaction.objectStore(storeName);
var request=store.get(value);
request.onsuccess=function(e){
var student=e.target.result;
student.age=35;
store.put(student);
};
}
//删除数据
function deleteDataByKey(db,storeName,value){
var transaction=db.transaction(storeName,'readwrite');
var store=transaction.objectStore(storeName);
store.delete(value);
}
//清空object store数据(student)
function clearObjectStore(db,storeName){
var transaction=db.transaction(storeName,'readwrite');
var store=transaction.objectStore(storeName);
store.clear();
}
//关闭数据库
function closeDB(db){
db.close();
}
//删除数据库
function deleteDB(name){
indexedDB.deleteDatabase(name);
}
//配置数据库
var myDB={
name:'test2',
version:3,
db:null
}; var students=[
{
id:1001,
name:"Byron",
age:24
},
{
id:1002,
name:"Frank",
age:30
},
{
id:1003,
name:"Aaron",
age:26
}
];
openDB(myDB.name,myDB.version);//打开数据库
setTimeout(function(){
addData(myDB.db,'students');
},1000);
//closeDB(myDB.db);//关闭数据库 打开和关闭数据库不能同时存在？？？
//deleteDB(myDB.name);//删除数据库 </script>