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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 949

<?php
public function addExpression($expression, $alias = NULL, $arguments = array()) {
  if (empty($alias)) {
    $alias = 'expression';
  }

  $alias_candidate = $alias;
  $count = 2;
  while (!empty($this->expressions[$alias_candidate])) {
    $alias_candidate = $alias . '_' . $count++;
  }
  $alias = $alias_candidate;

  $this->expressions[$alias] = array(
      'expression' => $expression,
      'alias' => $alias,
      'arguments' => $arguments,
    );

  return $alias;
}
?>