Register callback function based on event name.

# Swoole\MySQL::on

(PECL swoole >= 1.9.0)

Swoole\MySQL::on — Register callback function based on event name.

### 说明

public function Swoole\MySQL::on(string `$event_name`, callable `$callback`): void

Register callback function based on event name, current only 'close' event is supported.

### 参数

`event_name`

`callback`

### 返回值

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