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Database abstraction layer

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

Code

includes/database/select.inc, line 561

<?php
public function countQuery() {
  // Create our new query object that we will mutate into a count query.
  $count = clone($this);

  // Zero-out existing fields and expressions.
  $fields = & $count->getFields();
  $fields = array();
  $expressions = & $count->getExpressions();
  $expressions = array();

  // Also remove 'all_fields' statements, which are expanded into tablename.*
  // when the query is executed.
  $tables = &$count->getTables();
  foreach ($tables as $alias => &$table) {
    unset($table['all_fields']);
  }

  // Ordering a count query is a waste of cycles, and breaks on some
  // databases anyway.
  $orders = &$count->getOrderBy();
  $orders = array();

  // COUNT() is an expression, so we add that back in.
  $count->addExpression('COUNT(*)');

  return $count;
}
?>