The example of this article describes the method of Yii+MYSQL lock table to prevent duplicate data in concurrent situations. Share it with everyone for your reference, as follows:

lock table read lock

If a thread obtains a read lock on a table, then the thread and all other threads can only read locks from the table Read data, no write operations can be performed.

lock tables user read;//讀鎖定表
unlock tables;//解鎖
lock tables user read local;//本地讀鎖定表，其他線程的insert未被阻塞，update操作被阻塞

lock table write lock

If a thread obtains a write lock on a table, then only the thread that owns the lock can read from and write to the table. Other threads are blocked.

lock tables user write;//寫鎖定表
unlock tables;//解鎖

Usage examples in Yii

/**
* 當(dāng)日單項(xiàng)內(nèi)容狀態(tài)
*/
public function getPointAready($marke,$dayTime){
  $model = SysRun::model()->findByAttributes(array('syr_marking'=>$marke,'syr_daytime'=>$dayTime));
  if(empty($model)){
    //表寫鎖定
    Yii::app()->db->createCommand()->setText("lock tables {{sys_run}} WRITE")->execute();
    $model = new SysRun();
    $model->syr_marking = $marke;
    $model->syr_daytime = $dayTime;
    $model->syr_val = 0;
    $model->syr_subval = 0;
    $model->save();
    //表解鎖
    Yii::app()->db->createCommand()->setText("unlock tables")->execute();
  }
  return $model;
}

I hope this article will be helpful to everyone’s PHP program design based on the Yii framework.

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