Duplicate Data Stop in MySQL

问题

I have a table below :

+-----+-------+------+------------+
| ID  | RefID | Type | EventTime  |
+-----+-------+------+------------+
| 101 |   228 |    1 | 1437195633 |
| 102 |   228 |    5 | 1437195633 |
| 103 |   228 |    1 | 1437195633 |
| 104 |   228 |    1 | 1437195442 |
| 105 |   228 |    1 | 1437195442 |
| 106 |   228 |    5 | 1437195442 |
| 107 |   228 |    1 | 1437165634 |
| 108 |   228 |    5 | 1437165442 |
| 109 |   228 |    1 | 1437165634 |
| 110 |   228 |    5 | 1437165442 |
+-----+-------+------+------------+

In that I want to stop inserting duplicate data based on the columns RefID,Type,EventTime only when value of Type = 1.

In the above table ID pair is duplicate (101,103), (104,105), (107,109).

If now I will insert another data say :

INSERT INTO table VALUES('',228,1,1437165634);

Then it should not insert. I am checking while inserting into that table but that is not working as I have checked at the same time 2 insert query is happening, I need to stop it using UNIQUE key constraints.

回答1:

You need change DB architecture. Add table with unique index by RefId, here you will write record with Type "1". In your Yii model in method beforesave check your Type if is 1 to write in added table otherwise write to old table. And you need change beforefind method

And I'm sorry for my english

回答2:

Please try:

public function unique($attribute, $params)
{
    if(!empty($model_name)){
            $this->addError('RefID', 'RefID already exists! Please choose a different one');
            return true;}
}

as a custom function in before save. and call it for the fields you want in the rule. I'm showing you the template for a single field refID

回答3:

I have solved it by using trigger as below :

DB Trigger

delimiter $$

drop trigger if exists stop_duplicate $$
create trigger stop_duplicate before insert on table
for each row
begin
  set @found := false;
  if new.Type = 1 then
SELECT 
        TRUE
    INTO @found FROM
        table
    WHERE
        RefID = new.RefID AND EventTime= new.EventTime AND Type= new.Type;

      if @found then
        signal sqlstate '23000' set message_text = 'CUSTOM_MSG_DUPLICATE';
        end if;
end if;
end   $$
delimiter ;

Yii Model Code

public function save($runValidation = true, $attributes = null) {
    Yii::log(__METHOD__.":: Start ", 'info');
    try {
        return parent::save();
    } catch (Exception $e) {
        $errorInfo = $e instanceof PDOException ? $e->errorInfo : null;
        $message = $e->getMessage();
        Yii::log(__METHOD__ . ": errorcode :{$e->getCode()}, errormessage:{$message} ", 'info');
        // Added for handling duplicate entry issue for index
        if ((int) $e->getCode() === 23000 && strpos($message, 'CUSTOM_MSG_DUPLICATE') !== false) {
            return false;
        }
        throw new CDbException(Yii::t('yii', 'CDbCommand failed to execute the SQL statement: {error}', array('{error}' => $message)), (int) $e->getCode(), $errorInfo);
    }
}

来源：https://stackoverflow.com/questions/32090658/duplicate-data-stop-in-mysql

标签

php

mysql

database

duplicate-data