第一步，配置.env
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=db_1
DB_USERNAME=user
DB_PASSWORD=pwd
DB_HOST_LIB=127.0.0.1
DB_PORT_LIB=3306
DB_DATABASE_LIB=db_2
DB_USERNAME_LIB=user
DB_PASSWORD_LIB=pwd
上面的_LIB可以改成你需要的，比如_TWO等等，只要后面配置成一样的即可
第二步，编辑config/database.php
在mysql后面新增配置信息
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'unix_socket' => env('DB_SOCKET', ''),
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null,
],
'mysql_lib' => [
'driver' => 'mysql',
'host' => env('DB_HOST_LIB', '127.0.0.1'),
'port' => env('DB_PORT_LIB', '3306'),
'database' => env('DB_DATABASE_LIB', 'forge'),
'username' => env('DB_USERNAME_LIB', 'forge'),
'password' => env('DB_PASSWORD_LIB', ''),
'unix_socket' => env('DB_SOCKET', ''),
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null,
],
第三步，在需要用到的model中，进行切换
class Books extends Model
{
protected $connection = 'mysql_lib';
public $table = "books";
public $timestamps = false;
}
使用DB查询的时候，切换方式：
DB::connection('mysql_lib')->select("select id,name from books");
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