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  1. Moodle
  2. MDL-63319

Renaming a column in MySQL or MSSQL could break on a reserved word



    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.3.7, 3.4.4, 3.5.1, 3.6
    • Fix Version/s: 3.4.6, 3.5.3
    • Component/s: Database SQL/XMLDB
    • Labels:


      On reading CONTRIB-7420, where there was the need to rename a column named w/ a reserved word, I found that sql_generator::getRenameFieldSQL properly encodes the column name, while the overridden method in MySQL doesn't take care of it.
      Same broken result when falling into the upgrade step coded for MDL-60793, as already described in the Community some time ago: https://moodle.org/mod/forum/discuss.php?d=373009.

      Again, same end effect appears in MSSQL - there are no public posts about it -, here since the syntax of the stored procedure doesn't handle quotes as coded in getEncQuoted() for general usage.


      • on MySQL, you cannot rename a field named with a reserved word; this is the major issue affecting the two examples above
      • on MSSQL, you cannot rename a field into a reserved word, this is a minor/cosmetic issue; a peer review should discourage people from renaming a field from a valid name into a reserved word for at least one of the supported DB servers in Moodle
      • on both PostgreSQL and Oracle Moodle DB API supports to go back and forth on renaming a field from/into a reserved word


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