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added example to db migration query builder usage

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Carsten Brandt
2017-08-24 10:40:45 +02:00
parent 79ad74f763
commit c70f274ca5
1 changed files with 11 additions and 2 deletions
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13
docs/guide/db-migrations.md
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@ -704,8 +704,17 @@ Below is the list of all these database accessing methods:
* [[yii\db\Migration::dropCommentFromTable()|dropCommentFromTable()]]: dropping comment from table
> Info: [[yii\db\Migration]] does not provide a database query method. This is because you normally do not need
to display extra message about retrieving data from a database. It is also because you can use the powerful
[Query Builder](db-query-builder.md) to build and run complex queries.
> to display extra message about retrieving data from a database. It is also because you can use the powerful
> [Query Builder](db-query-builder.md) to build and run complex queries.
> Using Query Builder in a migration may look like this:
>
> ```php
> // update status field for all users
> foreach((new Query)->from('users')->each() as $user) {
> $this->update('users', ['status' => 1], ['id' => $user['id']);
> }
> ```
> Note: When manipulating data using a migration you may find that using your [Active Record](db-active-record.md) classes
> for this might be useful because some of the logic is already implemented there. Keep in mind however, that in contrast