Yiic 多数据库迁移

Question

是否可以为多个数据库运行 Yiic migrate create 命令？

我有一个多租户数据架构、一个源代码和多个客户端数据库。每个客户端将使用相同的源代码，但使用单独的数据库。

例如。 Andrew.Digital.com、Samson.Digital.com 将有两个数据库但指向相同的源代码。

所以我只想知道是否有可能将 Yiic 迁移用于多个数据库？

什么是 SAAS（多租户）https://msdn.microsoft.com/en-us/library/aa479086.aspx

Answer 1

您可以在 protected/config/console.php 上配置多个连接

然后，在运行迁移时，指定连接 id

/yiic migrate --connectionID=db         # The default
/yiic migrate --connectionID=andrew     # connection andrew
/yiic migrate --connectionID=client3    # connection client3

Answer 2

您可以配置多个数据库连接并在上述 @crafter 中提到的迁移命令中提及，或者您可以在运行时覆盖数据库连接并使其动态化。

这里有一些步骤可以覆盖默认的 Yii 迁移控制器类并使用多个数据库迁移。

1：在console/controllers/MigrateController下新建一个控制器类（MigrateController）

2：将以下内容添加到上面创建的类（MigrateController）（console/controllers/MigrateController）中。

```

<?php
/**
 * Yii MigrateController class that will override default up functionality & used dynamic connection based on your settings, or DB lists
 * @author Nadeem Akhtar <nadeem@myswich.com>
 * Date: 1/19/16
 * Time: 4:34 PM
 */


namespace console\controllers;

use Yii;
use yii\console\controllers\MigrateController as BaseMigrateController;
use yii\helpers\Console;

/**
 * Test controller
 */
class MigrateController extends BaseMigrateController {

    /*
     * init function
     *
     *
     * */
    public function init() {
        parent::init();
    }

    /**
     * Upgrades the application by applying new migrations.
     * For example,
     *
     * ```
     * yii migrate     # apply all new migrations
     * yii migrate 3   # apply the first 3 new migrations
     * ```
     *
     * @param integer $limit the number of new migrations to be applied. If 0, it means
     * applying all available new migrations.
     *
     * @return integer the status of the action execution. 0 means normal, other values mean abnormal.
     * Example call: **./yii migrate/migrate-up**
     */
    public function actionMigrateUp($limit = 0)
    {
        // Get all databases from companies settings
        $companies = Companies::find()->where('settings')->all();

        foreach($companies as $company) {

            $this->setRunTimeConnection($company['settings']); // This will set dynamic connection based on your record in DB

            $this->stdout("New migration founds for ".$company['name'].".\n", Console::FG_GREEN); // print message to show which migration is runing for which company 
            $this->actionUp($limit);
        }
    }

    /*
     * Dynamic connection
     * Override default **Yii::$app->db** settings         
     *
     * */

    public function setRunTimeConnection($setting) {

        $host = $setting['DB_host'];
        $dbName = $setting['DB_name'];

        $dsn = "mysql:host=$host;dbname=$dbName"; //Host & Database
        Yii::$app->db->dsn = $dsn;
        Yii::$app->db->username = $setting['DB_username'];
        Yii::$app->db->password = $setting['DB_password'];
    }
}

3：在你的控制台/config/main.php 中添加迁移控制器映射

.
.
.
'controllerMap' => [
        'migrate'   => 'console\controllers\MigrateController',
    ],

4：现在创建一些虚拟迁移并在 $array 列表中添加三个或四个数据库

5：你已经完成了一切！！！

你可以根据自己的要求玩更多。