[ci skip] 3.1.10 release

1 files changed, 0 insertions, 184 deletions

diff --git a/user_guide_src/source/libraries/migration.rst b/user_guide_src/source/libraries/migration.rst
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-################
-Migrations Class
-################
-
-Migrations are a convenient way for you to alter your database in a 
-structured and organized manner. You could edit fragments of SQL by hand 
-but you would then be responsible for telling other developers that they 
-need to go and run them. You would also have to keep track of which changes 
-need to be run against the production machines next time you deploy.
-
-The database table **migration** tracks which migrations have already been 
-run so all you have to do is update your application files and 
-call ``$this->migration->current()`` to work out which migrations should be run. 
-The current version is found in **application/config/migration.php**.
-
-.. contents::
-  :local:
-
-.. raw:: html
-
-  <div class="custom-index container"></div>
-
-********************
-Migration file names
-********************
-
-Each Migration is run in numeric order forward or backwards depending on the
-method taken. Two numbering styles are available:
-
-* **Sequential:** each migration is numbered in sequence, starting with **001**.
-  Each number must be three digits, and there must not be any gaps in the
-  sequence. (This was the numbering scheme prior to CodeIgniter 3.0.)
-* **Timestamp:** each migration is numbered using the timestamp when the migration
-  was created, in **YYYYMMDDHHIISS** format (e.g. **20121031100537**). This
-  helps prevent numbering conflicts when working in a team environment, and is
-  the preferred scheme in CodeIgniter 3.0 and later.
-
-The desired style may be selected using the ``$config['migration_type']``
-setting in your *application/config/migration.php* file.
-
-Regardless of which numbering style you choose to use, prefix your migration
-files with the migration number followed by an underscore and a descriptive
-name for the migration. For example:
-
-* 001_add_blog.php (sequential numbering)
-* 20121031100537_add_blog.php (timestamp numbering)
-
-******************
-Create a Migration
-******************
-	
-This will be the first migration for a new site which has a blog. All 
-migrations go in the **application/migrations/** directory and have names such 
-as *20121031100537_add_blog.php*.
-::
-
-	<?php
-
-	defined('BASEPATH') OR exit('No direct script access allowed');
-
-	class Migration_Add_blog extends CI_Migration {
-
-		public function up()
-		{
-			$this->dbforge->add_field(array(
-				'blog_id' => array(
-					'type' => 'INT',
-					'constraint' => 5,
-					'unsigned' => TRUE,
-					'auto_increment' => TRUE
-				),
-				'blog_title' => array(
-					'type' => 'VARCHAR',
-					'constraint' => '100',
-				),
-				'blog_description' => array(
-					'type' => 'TEXT',
-					'null' => TRUE,
-				),
-			));
-			$this->dbforge->add_key('blog_id', TRUE);
-			$this->dbforge->create_table('blog');
-		}
-
-		public function down()
-		{
-			$this->dbforge->drop_table('blog');
-		}
-	}
-
-Then in **application/config/migration.php** set ``$config['migration_version'] = 20121031100537;``.
-
-*************
-Usage Example
-*************
-
-In this example some simple code is placed in **application/controllers/Migrate.php** 
-to update the schema.::
-
-	<?php
-	
-	class Migrate extends CI_Controller
-	{
-
-		public function index()
-		{
-			$this->load->library('migration');
-
-			if ($this->migration->current() === FALSE)
-			{
-				show_error($this->migration->error_string());
-			}
-		}
-
-	}
-
-*********************
-Migration Preferences
-*********************
-
-The following is a table of all the config options for migrations.
-
-========================== ====================== ========================== =============================================
-Preference                 Default                Options                    Description
-========================== ====================== ========================== =============================================
-**migration_enabled**      FALSE                  TRUE / FALSE               Enable or disable migrations.
-**migration_path**         APPPATH.'migrations/'  None                       The path to your migrations folder.
-**migration_version**      0                      None                       The current version your database should use.
-**migration_table**        migrations             None                       The table name for storing the schema
-                                                                             version number.
-**migration_auto_latest**  FALSE                  TRUE / FALSE               Enable or disable automatically 
-                                                                             running migrations.
-**migration_type**         'timestamp'            'timestamp' / 'sequential' The type of numeric identifier used to name
-                                                                             migration files.
-========================== ====================== ========================== =============================================
-
-***************
-Class Reference
-***************
-
-.. php:class:: CI_Migration
-
-	.. php:method:: current()
-
-		:returns:	TRUE if no migrations are found, current version string on success, FALSE on failure
-		:rtype:	mixed
-
-		Migrates up to the current version (whatever is set for
-		``$config['migration_version']`` in *application/config/migration.php*).
-
-	.. php:method:: error_string()
-
-		:returns:	Error messages
-		:rtype:	string
-
-		This returns a string of errors that were detected while performing a migration.
-
-	.. php:method:: find_migrations()
-
-		:returns:	An array of migration files
-		:rtype:	array
-
-		An array of migration filenames are returned that are found in the **migration_path** property.
-
-	.. php:method:: latest()
-
-		:returns:	Current version string on success, FALSE on failure
-		:rtype:	mixed
-
-		This works much the same way as ``current()`` but instead of looking for 
-		the ``$config['migration_version']`` the Migration class will use the very 
-		newest migration found in the filesystem.
-
-	.. php:method:: version($target_version)
-
-		:param	mixed	$target_version: Migration version to process
-		:returns:	TRUE if no migrations are found, current version string on success, FALSE on failure
-		:rtype:	mixed
-
-		Version can be used to roll back changes or step forwards programmatically to 
-		specific versions. It works just like ``current()`` but ignores ``$config['migration_version']``.
-		::
-
-			$this->migration->version(5);