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@todo Remove this as soon as db_rewrite_sql() has been exterminated.

Verwandte Themen

Database abstraction layer

Allow the use of different database servers using the same code base.

Code

includes/database/sqlite/database.inc, line 155

<?php
public function distinctField($table, $field, $query) {
  $field_to_select = 'DISTINCT(' . $table . '.' . $field . ')';
  // (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
  return preg_replace('/(SELECT.*)(?:' . $table . '\.|\s)(?<!DISTINCT\()(?<!DISTINCT\(' . $table . '\.)' . $field . '(.*FROM )/AUsi', '\1 ' . $field_to_select . '\2', $query);
}
?>