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[Mahara Bot <1827445@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://reviews.mahara.org/10392
Committed: https://git.mahara.org/mahara/mahara/commit/fb37ef6e28a2156efcd35ce3d0a53268b4f93d59
Submitter: Robert Lyon (robertl@xxxxxxxxxxxxxxx)
Branch:    master

commit fb37ef6e28a2156efcd35ce3d0a53268b4f93d59
Author: Cecilia Vela Gurovic <ceciliavg@xxxxxxxxxxxxxxx>
Date:   Thu Oct 3 13:50:55 2019 +1300

Bug 1827445: db_table_exists alternative without changing SQL exceptions

and the same for db_column_exists

behatnotneeded

Change-Id: Id69e285b39aff1dca7edbbf16847c3b7a436baa5

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https://bugs.launchpad.net/bugs/1827445

Title:
  Improve efficiency when checking if a table field exists

Status in Mahara:
  Fix Committed

Bug description:
  When upgrading we use a field_exists() check to see if a table has a
  certain column or not which is fine there as upgrade chunks are a one-
  time execution run when users are all logged out.

  However we have begun to use field_exists() within other parts of the
  code and so this can get called on every page load by multiple users
  at once. This requires fetching the ddl.lib file and setting ul an
  XMLDB table object and an XMLDB field object which has overhead.

  Instead we should just query the database directly and ask it if the
  table has the column or not

  So instead of doing:

  require_once('ddl.php');
  $table = new XMLDBTable('tablename');
  $field = new XMLDBField('fieldname');
  if (field_exists($table, $field)) {
      ...
  }

  We could just do:

  if (column_exists('tablename', 'fieldname')) {
      ...
  }

  And have the column_exists function that call the database directly

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