H5本地数据库使用实例
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
var db = openDatabase("myDataBase", "1.0", "myLocalMsg", 1024 * 1024);
/*
db.transaction(function(tx){
tx.executeSql('drop table myLocalMsg');
});
*/
var myNowUserId = '21538'
var myCreateData = [
{msgId:1,isRead:0,createTime:'2019-01-01 00:00:00'},
{msgId:2,isRead:0,createTime:'2019-01-02 00:00:00'},
{msgId:3,isRead:0,createTime:'2019-01-03 00:00:00'},
{msgId:4,isRead:0,createTime:'2019-01-04 00:00:00'},
{msgId:5,isRead:0,createTime:'2019-01-05 00:00:00'},
{msgId:6,isRead:0,createTime:'2019-01-06 00:00:00'},
{msgId:7,isRead:0,createTime:'2019-01-07 00:00:00'},
{msgId:9,isRead:0,createTime:'2019-01-08 00:00:00'}
]
db.transaction(function(tx){
tx.executeSql('SELECT * FROM myLocalMsg where userId=? ',
[myNowUserId],
function(transaction,results){
console.log("成功查询信息打印==================================")
myLocalMsgData = results.rows
console.log(myLocalMsgData)
console.log(myCreateData)
if( myLocalMsgData.length > 0 ){
for( var i = 0 ; i < myCreateData.length ; i++ ){ //循环判断该条信息是否应该新增
var isAddMsg = 1
for( var j = 0 ; j < myLocalMsgData.length ; j++ ){
if( myCreateData[i].msgId == myLocalMsgData[j].msgId ){
isAddMsg = 0
}
}
if( isAddMsg == 1 ){
tx.executeSql('INSERT INTO myLocalMsg (userId,msgId,isRead,createTime) VALUES (?,?,?,?)',
[myNowUserId,myCreateData[i].msgId,myCreateData[i].isRead,myCreateData[i].createTime],
function(transaction,results){
console.log("插入数据成功")
console.log(results)
},
function(transaction,errMsg){
console.log("插入数据失败信息打印：")
console.log(errMsg)
}
)
}
}
for( var i = 0 ; i < myLocalMsgData.length ; i++ ){ //循环判断该条信息是否应该删除
var isDeleteMsg = 1
for( var j = 0 ; j < myCreateData.length ; j++ ){
if( myLocalMsgData[i].msgId == myCreateData[j].msgId ){
isDeleteMsg = 0
}
}
if( isDeleteMsg == 1 ){ //删除
console.log(myLocalMsgData[i].msgId)
console.log(myNowUserId)
tx.executeSql("DELETE FROM myLocalMsg WHERE msgId= ? and userId = ?",
[myLocalMsgData[i].msgId,myNowUserId],
function(transaction,results) {
console.log("删除成功")
console.log(results)
},
function (transaction,errMsg) {
console.log("删除失败")
console.log(errMsg)
}
)
}
}
}else{
for(var i = 0 ; i < myCreateData.length ; i++ ){
tx.executeSql('INSERT INTO myLocalMsg (userId,msgId,isRead,createTime) VALUES (?,?,?,?)',
[myNowUserId,myCreateData[i].msgId,myCreateData[i].isRead,myCreateData[i].createTime],
function(transaction,results){
console.log("插入数据成功")
console.log(results)
},
function(transaction,errMsg){
console.log("插入数据失败信息打印：")
console.log(errMsg)
}
)
}
}
},
function(transaction,errMsg){
console.log("查询失败开始创建表格")
tx.executeSql('CREATE TABLE myLocalMsg(userId int,msgId int,isRead int,createTime date)',
[],
function(transaction,results){
console.log("创建表格成功")
for(var i = 0 ; i < myCreateData.length ; i++ ){
tx.executeSql('INSERT INTO myLocalMsg (userId,msgId,isRead,createTime) VALUES (?,?,?,?)',
[myNowUserId,myCreateData[i].msgId,myCreateData[i].isRead,myCreateData[i].createTime],
function(transaction,results){
console.log("插入数据成功")
console.log(results)
},
function(transaction,errMsg){
console.log("插入数据失败信息打印：")
console.log(errMsg)
}
)
}
},
function(transaction,errMsg){
console.log("创建表格失败信息打印：")
console.log(errMsg)
}
)
})
})
</script>
</body>
</html>
