專案為了提升效能

需要select查詢的時候，讀取從庫mysql資料

插入修改的時候，操作主庫mysql資料

在laravel中只需要配置一下就可以實現

read就是從庫的連線資訊，write就是主庫的連線資訊，在.env裡可以進行配置

        'mysql' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_OA_URL'),
            //配置資料庫讀寫分離
            'read' => [
                'host'
 
 => env('DB_OA_READ_HOST', '127.0.0.1'),
                'port' => env('DB_OA_READ_PORT', '3306'),
                'database' => env('DB_OA_READ_DATABASE', 'forge'),
                'username' => env('DB_OA_READ_USERNAME', 'forge'),
                'password' => env('DB_OA_READ_PASSWORD'
 
, ''),
            ],
            'write' => [
                'host' => env('DB_OA_HOST', '127.0.0.1'),
                'port' => env('DB_OA_PORT', '3306'),
                'database' => env('DB_OA_DATABASE', 'forge'),
                'username' => env('DB_OA_USERNAME', 'forge'),
                
 
'password' => env('DB_OA_PASSWORD', ''),
            ],
            'unix_socket' => env('DB_OA_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => true,
            'engine' => null,
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ],

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