Austin Austin - 6 months ago 20
MySQL Question

Transactions in MySQL - Unable to Roll Back

I'm using MySQL 5.0.27 and am trying to get transactions to work. I followed this tutorial:

http://dev.mysql.com/doc/refman/5.0/es/connector-net-examples-mysqltransaction.html

and still cannot get these to work. The table I am trying to update is InnoDB and have tried to execute 'set autocommit=0' but it doesn't seem to be doing anything.... The code I've written is the following:

public int transactionUpdate()
{
MySqlConnection connection = new MySqlConnection(connStr);
connection.Open();
MySqlCommand command = connection.CreateCommand();
MySqlTransaction trans;
trans = connection.BeginTransaction();
command.Connection = connection;
command.Transaction = trans;
try
{
command.CommandText = "SET autocommit = 0";
command.executeNonQuery();
command.CommandText = "UPDATE TBL.rec_lang rl SET rl.lang_code = 'en-us' WHERE rl.recording=123456";
command.executeNonQuery();
command.CommandText = "UPDATE TBL.rec_lang rl SET rl.lang_code = en-us WHERE rl.recording=123456";
command.executeNonQuery();
trans.Commit();
}
catch(Exception ex)
{
try
{
trans.Rollback();
}
catch(MySqlException mse)
{
log.error(mse);
}
}
}


The second command fails as it is missing the ' around 'en-us'. This should roll back the first query as well to a previous value but it isn't. Can you tell me what I'm doing wrong???

MySQLConnector v. 6.3.6.0

MySQL v. 5.0.27

C# VS2010

Answer

I had a second database open that had bad data showing ><... this method works :). Turns out I didn't even need:

command.CommandText = "SET autocommit = 0";  
command.executeNonQuery();

So the good news is this code does work for transactions... bad news i didn't figure it out until i posted ;)