DrupalAPI.de

1. drupal
   1. drupal7

Verwandte Themen

Database abstraction layer

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

Code

includes/database/select.inc, line 905

<?php
public function addField($table_alias, $field, $alias = NULL) {
  // If no alias is specified, first try the field name itself.
  if (empty($alias)) {
    $alias = $field;
  }

  // If that's already in use, try the table name and field name.
  if (!empty($this->tables[$alias])) {
    $alias = $table_alias . '_' . $field;
  }

  // If that is already used, just add a counter until we find an unused alias.
  $alias_candidate = $alias;
  $count = 2;
  while (!empty($this->tables[$alias_candidate])) {
    $alias_candidate = $alias . '_' . $count++;
  }
  $alias = $alias_candidate;

  $this->fields[$alias] = array(
      'field' => $field,
      'table' => $table_alias,
      'alias' => $alias,
    );

  return $alias;
}
?>