多个数据库连接和 Yii 2.0 [英] Multiple database connections and Yii 2.0

问题描述

我有两个数据库，每个数据库都有相同的表和相同的字段，但是如何在 Yii 2.0?

I have two databases, and every database has the same table with the same fields, but how do I get all records from all of two databases at the same time in Yii 2.0?

推荐答案

首先你需要像下面这样配置你的数据库:

First you need to configure your databases like below:

return [
'components' => [
    'db1' => [
        'class' => 'yii\db\Connection',
        'dsn' => 'mysql:host=localhost;dbname=db1name', //maybe other dbms such as psql,...
        'username' => 'db1username',
        'password' => 'db1password',
    ],
    'db2' => [
        'class' => 'yii\db\Connection',
        'dsn' => 'mysql:host=localhost;dbname=db2name', // Maybe other DBMS such as psql (PostgreSQL),...
        'username' => 'db2username',
        'password' => 'db2password',
    ],
],
];

然后你可以简单地:

// To get from db1
Yii::$app->db1->createCommand((new \yii\db\Query)->select('*')->from('tbl_name'))->queryAll()

// To get from db2
Yii::$app->db2->createCommand((new \yii\db\Query)->select('*')->from('tbl_name'))->queryAll()

如果您使用的是活动记录模型，您可以在模型中定义:

If you are using an active record model, in your model you can define:

public static function getDb() {
    return Yii::$app->db1;
}

//Or db2
public static function getDb() {
    return Yii::$app->db2;
}

那么:

如果你在getDb()方法中设置了db1，结果将从db1中获取，依此类推.

If you have set db1 in the getDb() method, the result will be fetched from db1 and so on.

ModelName::find()->select('*')->all();

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