MySQL add fields to an Enum

I have to add some enum options to a database table. The problem being, I will have to do this to several tables & databases, and they may not all have the same enum data type. Is there a why to write an alter table query or something similar to append options to a enum data type?

If there is no way to do this purely in MySQL, how would you approach this problem with a PHP开发者_如何学运维 script?

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there is not easy way to append enum values.

this is ugly and untested, but i think it will give you an idea:

<?php

$sql = "select table_schema
             , table_name
             , column_name
             , column_type
             , is_nullable
             , column_default
          from information_schema
         where data_type = 'enum'";

$res = mysql_query($sql);

while ($row = mysql_fetch_assoc($res)) {

  // these are important -->       leading comma --v      close paren --v
  $new_enum = substr($row['column_type', 0, -1) . ",'new','enums','here')"

  $sql = "alter table `{$row['table_schema']}`.`{$row['table_name']}`";
  $sql .= " modify column `{$row['column_name']}`";
  $sql .= " $new_enum";
  $sql .= ($row['is_nullable'] == 'YES') ? " NULL" : " NOT NULL";
  $sql .= " default $row['column_default']";

  mysql_query($sql);
}

you could probably do this "purely in mysql" with a stored procedure, but that's more than i can wrap my brain around right now. :)