SQLite更新查询在Phonegap中不起作用

Question

I am having a table called Demo in SQLite with Phonegap. I've inserted few values in it. Now I want to update one record.

var db = window.openDatabase("Database", "1.0", "PhoneGap Demo", 200000);

db.transaction(updatemonthSaveingDB, errorCB);

function updatemonthSaveingDB(tx) 
{
    tx.executeSql("UPDATE DEMO SET data = " + submitval + " WHERE id = " + 8, [], updateCB, errorCB);
}

function errorCB(err) 
{
    alert("Error processing SQL: " + err.code);
}

Now when I throw this query, it shows * Error processing SQL: 0 * alert.

Answer 1

The problem is the way of passing variable inside a sqlite query is incorrect In this function

function updatemonthSaveingDB(tx) 
{
tx.executeSql("UPDATE DEMO SET data = " + submitval + " WHERE id = " + 8, [],   updateCB, errorCB);
 }

sqlite consider "UPDATE DEMO SET data = " as a query because you have used " incorrectly. The correct way is:

      function updatemonthSaveingDB(tx) 
{
    tx.executeSql("UPDATE DEMO SET data ='" +submitval+"' WHERE id = '"+8+"' ;", [],   updateCB, errorCB);
}

Answer 2

Give quote '' beetween each column value.

I also remove [], updateCB, errorCB); . it wouldn't work if you not declare updateCB and errorCB function.

I update the code. work for me.

function updatemonthSaveingDB(tx) 
{
   tx.executeSql("UPDATE DEMO SET data='" + submitval + "' WHERE id='8'");
}

Answer 3

I believe that what is happening is that your transaction is actually successful. If you go and look at this table of SQLite Error Codes (http://www.sqlite.org/c3ref/c_abort.html) you'll see that an error message of "0" reads as "/* Successful result */".

If "updateCB" is not actually a function (you don't define it here) is it possible that errorCB is being read as your success callback and being called as a result?