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Diffstat (limited to 'user_guide_src/source/database/forge.rst')
| -rw-r--r-- | user_guide_src/source/database/forge.rst | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/user_guide_src/source/database/forge.rst b/user_guide_src/source/database/forge.rst index de5748b45..ca904ed00 100644 --- a/user_guide_src/source/database/forge.rst +++ b/user_guide_src/source/database/forge.rst @@ -231,7 +231,7 @@ Modifying Tables **************** $this->dbforge->add_column() -============================= +============================ The ``add_column()`` method is used to modify an existing table. It accepts the same field array as above, and can be used for an unlimited @@ -243,10 +243,25 @@ number of additional fields. 'preferences' => array('type' => 'TEXT') ); $this->dbforge->add_column('table_name', $fields); - // gives ALTER TABLE table_name ADD preferences TEXT + // Executes: ALTER TABLE table_name ADD preferences TEXT + +If you are using MySQL or CUBIRD, then you can take advantage of their +AFTER and FIRST clauses to position the new column. + +Examples:: + + // Will place the new column after the `another_field` column: + $fields = array( + 'preferences' => array('type' => 'TEXT', 'after' => 'another_field') + ); + + // Will place the new column at the start of the table definition: + $fields = array( + 'preferences' => array('type' => 'TEXT', 'first' => TRUE) + ); $this->dbforge->drop_column() -============================== +============================= Used to remove a column from a table. @@ -256,7 +271,7 @@ Used to remove a column from a table. $this->dbforge->modify_column() -================================ +=============================== The usage of this method is identical to ``add_column()``, except it alters an existing column rather than adding a new one. In order to |