function db_prefix_tables

Append a database prefix to all tables in a query.

Queries sent to Drupal should wrap all table names in curly brackets. This function searches for this syntax and adds Drupal's table prefix to all tables, allowing Drupal to coexist with other systems in the same database if necessary.

Parameters

$sql: A string containing a partial or entire SQL query.

Return value

The properly-prefixed string.

Related topics

File

includes/database.inc, line 81

Wrapper for database interface code.

Code

function db_prefix_tables($sql) {
  global $db_prefix;
  if (is_array($db_prefix)) {
    if (array_key_exists('default', $db_prefix)) {
      $tmp = $db_prefix;
      unset($tmp['default']);
      foreach ($tmp as $key => $val) {
        $sql = strtr($sql, array(
          '{' . $key . '}' => $val . $key,
        ));
      }
      return strtr($sql, array(
        '{' => $db_prefix['default'],
        '}' => '',
      ));
    }
    else {
      foreach ($db_prefix as $key => $val) {
        $sql = strtr($sql, array(
          '{' . $key . '}' => $val . $key,
        ));
      }
      return strtr($sql, array(
        '{' => '',
        '}' => '',
      ));
    }
  }
  else {
    return strtr($sql, array(
      '{' => $db_prefix,
      '}' => '',
    ));
  }
}