[ci skip] 3.1.10 release

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-############
-Transactions
-############
-
-CodeIgniter's database abstraction allows you to use transactions with
-databases that support transaction-safe table types. In MySQL, you'll
-need to be running InnoDB or BDB table types rather than the more common
-MyISAM. Most other database platforms support transactions natively.
-
-If you are not familiar with transactions we recommend you find a good
-online resource to learn about them for your particular database. The
-information below assumes you have a basic understanding of
-transactions.
-
-CodeIgniter's Approach to Transactions
-======================================
-
-CodeIgniter utilizes an approach to transactions that is very similar to
-the process used by the popular database class ADODB. We've chosen that
-approach because it greatly simplifies the process of running
-transactions. In most cases all that is required are two lines of code.
-
-Traditionally, transactions have required a fair amount of work to
-implement since they demand that you keep track of your queries and
-determine whether to commit or rollback based on the success or failure
-of your queries. This is particularly cumbersome with nested queries. In
-contrast, we've implemented a smart transaction system that does all
-this for you automatically (you can also manage your transactions
-manually if you choose to, but there's really no benefit).
-
-Running Transactions
-====================
-
-To run your queries using transactions you will use the
-$this->db->trans_start() and $this->db->trans_complete() functions as
-follows::
-
-	$this->db->trans_start();
-	$this->db->query('AN SQL QUERY...');
-	$this->db->query('ANOTHER QUERY...');
-	$this->db->query('AND YET ANOTHER QUERY...');
-	$this->db->trans_complete();
-
-You can run as many queries as you want between the start/complete
-functions and they will all be committed or rolled back based on success
-or failure of any given query.
-
-Strict Mode
-===========
-
-By default CodeIgniter runs all transactions in Strict Mode. When strict
-mode is enabled, if you are running multiple groups of transactions, if
-one group fails all groups will be rolled back. If strict mode is
-disabled, each group is treated independently, meaning a failure of one
-group will not affect any others.
-
-Strict Mode can be disabled as follows::
-
-	$this->db->trans_strict(FALSE);
-
-Managing Errors
-===============
-
-If you have error reporting enabled in your config/database.php file
-you'll see a standard error message if the commit was unsuccessful. If
-debugging is turned off, you can manage your own errors like this::
-
-	$this->db->trans_start();
-	$this->db->query('AN SQL QUERY...');
-	$this->db->query('ANOTHER QUERY...');
-	$this->db->trans_complete();
-	
-	if ($this->db->trans_status() === FALSE)
-	{
-		// generate an error... or use the log_message() function to log your error
-	}
-
-Disabling Transactions
-======================
-
-If you would like to disable transactions you can do so using
-``$this->db->trans_off()``::
-
-	$this->db->trans_off();
-	
-	$this->db->trans_start();
-	$this->db->query('AN SQL QUERY...');
-	$this->db->trans_complete();
-
-When transactions are disabled, your queries will be auto-committed, just as
-they are when running queries without transactions, practically ignoring
-any calls to ``trans_start()``, ``trans_complete()``, etc.
-
-Test Mode
-=========
-
-You can optionally put the transaction system into "test mode", which
-will cause your queries to be rolled back -- even if the queries produce
-a valid result. To use test mode simply set the first parameter in the
-$this->db->trans_start() function to TRUE::
-
-	$this->db->trans_start(TRUE); // Query will be rolled back
-	$this->db->query('AN SQL QUERY...');
-	$this->db->trans_complete();
-
-Running Transactions Manually
-=============================
-
-If you would like to run transactions manually you can do so as follows::
-
-	$this->db->trans_begin();
-	
-	$this->db->query('AN SQL QUERY...');
-	$this->db->query('ANOTHER QUERY...');
-	$this->db->query('AND YET ANOTHER QUERY...');
-	
-	if ($this->db->trans_status() === FALSE)
-	{
-		$this->db->trans_rollback();
-	}
-	else
-	{
-		$this->db->trans_commit();
-	}
-
-.. note:: Make sure to use $this->db->trans_begin() when running manual
-	transactions, **NOT** $this->db->trans_start().