Question

I want to change my field comment using php but there is a problem!!

I need to get other column`s features 😐

this is my code(gets all column features):

$query = "
        SELECT 
            *
            FROM information_schema.COLUMNS
                WHERE 
                    TABLE_SCHEMA = '$dbName' AND 
                    TABLE_NAME = '$tableName' AND 
                    COLUMN_NAME = '".$row->name."'";

    $result = mysql_query($query) or die($query.'<br>'.mysql_error());
    $tempRow = mysql_fetch_object($result);

this is my code that changes the comment

 $query = "ALTER TABLE `$tableName` 
            MODIFY  `".$row->name."` 
            ".$tempRow->COLUMN_TYPE." 
            DEFAULT ".$tempRow->COLUMN_DEFAULT."
            COMMENT '$comment'"   ;


        $result = mysql_query($query) or die($query.'<br>'.mysql_error());

but problem is that i lose some features , for example , outo increament , primary key …

is there any way that i dont need to write all features , just change comment like update query ?!! if not how I should correct this query?!

Answer 1

        if ($tempRow->IS_NULLABLE == "NO")
        {
            $nullStr =" Not null ";
        }else
        {
            $nullStr ="  null ";
        }            

        if (strlen($tempRow->COLUMN_DEFAULT) >0 )
        {
            $defaultStr = "DEFAULT ".$tempRow->COLUMN_DEFAULT;
        }else
        {
            $defaultStr ="  ";
        }

        if (strlen($tempRow->COLLATION_NAME )>0)
        {
            $collateStr = "collate " . $tempRow->COLLATION_NAME ;
        }
         $comment .= implode("|",$info);
        $query = "ALTER TABLE `$tableName` 
            MODIFY  `".$row->name."` 
            ".$tempRow->COLUMN_TYPE." 
            ".$nullStr."
            ".$extraStr."
            ".$defaultStr."
            ". $tempRow->EXTRA."
            ". $collateStr."

            COMMENT '$comment'"   ;