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//不开启事务  前两个sql 能够执行成功,第三个执行失败

$this->device_model->addForCamera(1, ‘爱三123‘, ‘2016122903‘, 0);

$this->device_model->setStateInDevices(1, array(2));

$this->device_model->addForCamera(1, ‘爱三1234567890‘, ‘2016122903‘, 0);

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//失败自动回滚

$this->db->trans_start();

//三条sql 都执行失败

$this->device_model->addForCamera(1, ‘爱三123‘, ‘2016122903‘, 0);

$this->device_model->setStateInDevices(1, array(2));

$this->device_model->addForCamera(1, ‘爱三1234567890‘, ‘2016122903‘, 0);

$this->db->trans_complete();

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//若失败手动回滚 成功手动提交

$this->db->trans_begin();

//三条sql 都执行失败

$this->device_model->addForCamera(1, ‘爱三123‘, ‘2016122903‘, 0);

$this->device_model->setStateInDevices(1, array(2));

$this->device_model->addForCamera(1, ‘爱三1234567890‘, ‘2016122903‘, 0);

if ($this->db->trans_status() === false) {

    $this->db->trans_rollback();

} else {

    $this->db->trans_commit();

}