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Schema API

A Drupal schema definition is an array structure representing one or more tables and their related keys and indexes. A schema is defined by hook_schema(), which usually lives in a modulename.install file.

Code

includes/database/pgsql/schema.inc, line 256

<?php
protected function _createKeySql($fields) {
  $ret = array();
  foreach ($fields as $field) {
    if (is_array($field)) {
      $ret[] = 'substr(' . $field[0] . ', 1, ' . $field[1] . ')';
    }
    else {
      $ret[] = $field;
    }
  }
  return implode(', ', $ret);
}
?>