PHP事务没有回滚

Question

I have some PHP code that reads a spreadsheet using PHPExcel and imports the data into a MySQL database. (innoDB) If the import encounters a duplicate record in the database it's supposed to fail and rollback all prior inserts. The rollback is not working, I wrote this small program that functions the same way.

$conn = null;
try {

$conn=new mysqli("myServer","user","password", "moveforward");
$conn->autocommit(FALSE);

$sql="insert into series (seriesLocation,seriesName,seriesDate) values('1','2','2013-05-21')";
echo "Executing query 1<br>";
$conn->query($sql);
if($conn->error!="") {
    $sqlError=$conn->error;
    $conn->rollback();
    echo "Rollback complete<br>";
    throw new Exception($sqlError);
}

//This will throw a duplicate exception
echo "Exceuting query 2<br>";
$conn->query($sql);
if($conn->error!="") { 
    $sqlError=$conn->error;
    $conn->rollback();
    echo "Rollback complete<br>";
    throw new Exception($sqlError);
}
echo "You shouldn't be here<br>";

$conn->commit();
echo "Transactions comitted<br>";

} catch (Exception $e) {
    echo "Exception: " . $e->getMessage() . "<br>";
}
$conn->close();
echo "Done<br>";

In looking at the php manual and checking other posts on here this looks like it should work. When I run it I get this:

Executing query 1
Exceuting query 2
Rollback complete
Exception: Duplicate entry '2' for key 'seriesName'
Done

Yet when I check the database the data from the first insert is in there.

Any ideas?

Answer 1

Guess your tables doesn't use an appropriate engine

http://php.net/mysqli.autocommit

This function doesn't work with non transactional table types (like MyISAM or ISAM).

However, it is much easier to use INSERT IGNORE (or REPLACE depending on what should be the correct behaviour) instead. In this case the duplicated rows are silently ignored (or replace the existing one ( REPLACE )). Of course this doesn't work, if you want to know, which are the duplicates.