CI框架--事務

CI框架中事務封裝的很完善，使用起來很簡單

1.不開啟事務

//不開啟事務  前兩個sql 能夠執行成功,第三個執行失敗
$this->device_model->addForCamera(1, '愛三123', '2016122903', 0);
$this->device_model->setStateInDevices(1, array(2));
$this->device_model->addForCamera(1, '愛三1234567890', '2016122903', 0);

2.自動事務

//失敗自動回滾
$this->db->trans_start();
//三條sql 都執行失敗
$this->device_model->addForCamera(1, '愛三123', '2016122903', 0);
$this->device_model->setStateInDevices(1, array(2));
$this->device_model->addForCamera(1, '愛三1234567890', '2016122903', 0);

$this->db->trans_complete();

3.手動事務

//若失敗手動回滾 成功手動提交
$this->db->trans_begin();

//三條sql 都執行失敗
$this->device_model->addForCamera(1, '愛三123', '2016122903', 0);
$this->device_model->setStateInDevices(1, array(2));
$this->device_model->addForCamera(1, '愛三1234567890', '2016122903', 0);

if ($this->db->trans_status() === false) {
    $this->db->trans_rollback();
} else {
    $this->db->trans_commit();
}