diff options
Diffstat (limited to 'user_guide_src/source/database/transactions.rst')
| -rw-r--r-- | user_guide_src/source/database/transactions.rst | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/user_guide_src/source/database/transactions.rst b/user_guide_src/source/database/transactions.rst index e82210b96..e9190e59a 100644 --- a/user_guide_src/source/database/transactions.rst +++ b/user_guide_src/source/database/transactions.rst @@ -35,7 +35,11 @@ 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(); + $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 @@ -61,7 +65,15 @@ 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 } + $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 + } Enabling Transactions ===================== @@ -70,7 +82,11 @@ Transactions are enabled automatically the moment you use $this->db->trans_start(). 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(); + $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-commited, just as they are when running queries without transactions. @@ -83,14 +99,29 @@ 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(); + $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(); } + $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(). |