HTML5, SQLite transaction question
Question
In my HTML5, i have a for loop which calls a function to insert into a database. I need this function to be inside a single transaction.
function Ins(id){
db.transaction(function(tx){
tx.executeSql('insert into Product(id) values(?);', [iName], function() {}, function() { });
});
}
The for loop
db.transaction(function(tx){tx.executeSql("BEGIN",[]);});
for (intCountLine=1;intCountLine<=1000;intCountLine++)
{
Ins(intCount);
}
db.transaction(function(tx){tx.executeSql("COMMIT",[]);});
You can see, i have the transaction begin & commit, but i assume when it calls the INS function, it would open a new transaction and close it, everytime it is called. How do i make sure that doesn't happen.
googled it but could not find it... throw me some light here....
1 answers
solution1
1 2011-05-27 07:09:12
May be this will works. Use insert select union all instead of creating 1000 insert statements. But this can insert only 500 rows at a time. Here is the code which i worked on, do a test on Google chrome i am sure it works.
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);
var msg;
var j=1;
var i=1;
var quer="";
db.transaction(function(tx){tx.executeSql("CREATE TABLE IF NOT EXISTS LOGS (ID INTEGER PRIMARY KEY ASC, todo TEXT)",[]);});
db.transaction(function(tx){tx.executeSql("delete from logs",[]);});
txquer();
showMsg();
function txquer()
{
quer="insert into logs ";
for(i=j;i<=j+498;i++)
{
quer+=" select "+i+",'test' union all";
}
quer+=" select "+i+",'test' ; ";
j=i+1;
db.transaction(
function(tx){
tx.executeSql(quer,[]);
}
);
}
function showMsg(){
db.transaction(function (tx) {
tx.executeSql('SELECT count(*) todo FROM LOGS', [], function (tx, results) {
var len = results.rows.item(0).todo;
msg = "<p>Found rows: " + len + "</p>";
document.querySelector('#status').innerHTML += msg;
}, null);
});
}
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