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yii2-migration

Disclaimer

This is a fork of https://github.com/bizley/yii2-migration - All credits to Bizley!

This is mostly for self use, and the work here is based on branch 3.x on top of version 3.6.5

Changes here add init() function to templates in order to specify the DB connection to use when executing migrations.
This allows to use the default Yii migration tool without specifying DB connection in command

What's tested

Methods: create and create-all

Migration creator and updater

Generates migration file based on the existing database table and previous migrations.

Installation

Add the package to your composer.json:

{
    "require": {
        "websvc/yii2migration": "^3.7"
    }
}

and run composer update or alternatively run composer require websvc/yii2migration:^3.7

Other versions

Configuration

Add the following in your configuration file (preferably console configuration file):

'components' => [
    // ...
],
'controllerMap' => [
    'migration' => [
        'class' => 'websvc\yii2migration\controllers\MigrationController',
    ],
],

Usage

The following console command are available:

• List all the tables in the database:

  php yii migration

  or

  php yii migration/list

• Generate migration to create DB table table_name:

  php yii migration/create table_name

• Generate migrations to create all DB tables:

  php yii migration/create-all

• Generate migration to update DB table table_name:

  php yii migration/update table_name

• Generate migrations to update all DB tables:

  php yii migration/update-all

You can generate multiple migrations for many tables at once by separating the names with a comma:

php yii migration/create table_name1,table_name2,table_name3

Starting from version 3.4/2.7 creating multiple table migrations at once forces the proper migration order based on the presence of the foreign keys. When tables are cross-referenced the additional foreign keys migration is generated at the end of default generation.

Updating migration

Starting with yii2-migration v2.0 it is possible to generate updating migration for database table.

1. History of applied migrations is scanned to gather all modifications made to the table.
2. Virtual table schema is prepared and compared with current table schema.
3. Differences are generated as update migration.
4. In case of migration history not keeping information about the table creating migration is generated.

Command line parameters

[1] Remember that with different database types general column schemas may be generated with different length.

MySQL examples:

Column varchar(255)
generalSchema=0: $this->string(255)
generalSchema=1: $this->string()

Column int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
generalSchema=0: $this->integer(11)->notNull()->append('AUTO_INCREMENT PRIMARY KEY')
generalSchema=1: $this->primaryKey()

Since 3.6/2.9 when column size is different from DBMS' default it's kept:
Column varchar(45)
generalSchema=0: $this->string(45)
generalSchema=1: $this->string(45)

[2] Here you can place migrations containing actions that can not be covered by extractor i.e. when there is a migration setting the RBAC hierarchy with authManager component. Such actions should be kept in separated migration and placed on this list to prevent them from being run during the extraction process.

Renaming

When you rename table or column remember to generate appropriate migration manually otherwise this extension will not generate updating migration (in case of the table) or will generate migration with command to drop original column and add renamed one (in case of the column). This is happening because yii2-migration can only compare two states of the table without the knowledge of how one state turned into another. And while the very result of migration renaming the column and the one dropping it and adding another is the same in terms of structure, the latter makes you lose data.

Once you add renaming migration to the history it's being tracked by the extension.

Notes

This extension should work with all database types supported in Yii 2 core:

• CUBRID (9.3.x and higher)
• MS SQL Server (2008 and above)
• MySQL (4.1.x and 5.x)
• Oracle
• PostgreSQL (9.x and above)
• SQLite (2/3)

Yii 2 limitations:

• version 2.0.13 is required to track non-unique indexes,
• version 2.0.14 is required to handle TINYINT and JSON type columns.

Only history of migrations extending yii\db\Migration class can be properly scanned and only changes applied with default yii\db\Migration methods can be recognised (with the exception of execute(), addCommentOnTable() and dropCommentFromTable() methods). Changes made to table's data (like insert(), upsert(), delete(), truncate(), etc.) are not tracked.

Updating migrations process requires for methods createTable(), addColumn(), and alterColumn() to provide changes in columns definition in form of an instance of yii\db\ColumnSchemaBuilder (like $this->string() instead of 'varchar(255)').

Tests

Tests for MySQL, PostgreSQL, and SQLite are provided. Database configuration is stored in tests/config.php (you can override it by creating config.local.php file there).