modules/simpletest/tests/database_test.module


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<?php
// $Id$

/**
 * Implementation of hook_query_alter().
 */
function database_test_query_alter(SelectQuery $query) {

  if ($query->hasTag('database_test_alter_add_range')) {
    $query->range(0, 2);
  }

  if ($query->hasTag('database_test_alter_remove_range')) {
    $query->range();
  }

  if ($query->hasTag('database_test_alter_add_join')) {
    $people_alias = $query->join('test', 'people', "test_task.pid=people.id");
    $name_field = $query->addField('people', 'name', 'name');
    $query->condition($people_alias . '.id', 2);
  }

  if ($query->hasTag('database_test_alter_change_conditional')) {
    $conditions =& $query->conditions();
    $conditions[0]['value'] = 2;
  }

  if ($query->hasTag('database_test_alter_change_fields')) {
    $fields =& $query->getFields();
    unset($fields['age']);
  }

  if ($query->hasTag('database_test_alter_change_expressions')) {
    $expressions =& $query->getExpressions();
    $expressions['double_age']['expression'] = 'age*3';
  }
}