function DatabaseUpdateTestCase::testExpressionUpdate in Drupal 7

Test updating with expressions.

File

modules/simpletest/tests/database_test.test, line 863

Class

DatabaseUpdateTestCase

Update builder tests.

Code

function testExpressionUpdate() {

  // Set age = 1 for a single row for this test to work.
  db_update('test')
    ->condition('id', 1)
    ->fields(array(
    'age' => 1,
  ))
    ->execute();

  // Ensure that expressions are handled properly.  This should set every
  // record's age to a square of itself, which will change only three of the
  // four records in the table since 1*1 = 1. That means only three records
  // are modified, so we should get back 3, not 4, from execute().
  $num_rows = db_update('test')
    ->expression('age', 'age * age')
    ->execute();
  $this
    ->assertIdentical($num_rows, 3, 'Number of affected rows are returned.');
}