2006年从mysqli迁移到PDO的错误代码映射

I'm converting a PHP code, which uses mysqli for connecting to mysql database, to a PHP code that uses PDO for connecting to mysql database.

Is there a SQLSTATE which is equivalent to the error code 2006 in mysqli?

Because a piece of my code is written like this:

switch($this->_dbi->errno){
    case 2006:
        $this->close();
        throw new Exception();
        break;
}

How can I use PDO to rewrite this code?

SQLSTATE is the return value of PDO::errorCode.

Error 2006(CR_SERVER_GONE_ERROR) means MySQL server has gone away

You can use the array of PDO::errorInfo. There you get an array like the following:

Array
(
    [0] => HY000
    [1] => 1
    [2] => near "bogus": syntax error
)

• 0: This is the same value like on PDO::errorCode.
• 1: The error number. Different between the database providers, but here would be your error number 2006.
• 2: The error message / description.

Your example would look like this:

switch ($pdo->errorInfo()[1]) {
    case 2006:
        $this->close();
        throw new Exception();
        break;
}