class LargeQueryTest

class LargeQueryTest extends DriverSpecificDatabaseTestBase {
  
  /**
   * Tests truncation of messages when max_allowed_packet exception occurs.
   */
  public function testMaxAllowedPacketQueryTruncating() : void {
    // The max_allowed_packet value is configured per database instance.
    // Retrieve the max_allowed_packet value from the current instance and
    // check if PHP is configured with sufficient allowed memory to be able
    // to generate a query larger than max_allowed_packet.
    $max_allowed_packet = $this->connection
      ->query('SELECT @@global.max_allowed_packet')
      ->fetchField();
    if (!Environment::checkMemoryLimit($max_allowed_packet + 16 * 1024 * 1024)) {
      $this->markTestSkipped('The configured max_allowed_packet exceeds the php memory limit. Therefore the test is skipped.');
    }
    $long_name = str_repeat('a', $max_allowed_packet + 1);
    try {
      $this->connection
        ->query('SELECT [name] FROM {test} WHERE [name] = :name', [
        ':name' => $long_name,
      ]);
      $this->fail("An exception should be thrown for queries larger than 'max_allowed_packet'");
    } catch (DatabaseException $e) {
      // Close and re-open the connection. Otherwise we will run into error
      // 2006 "MySQL server had gone away" afterwards.
      Database::closeConnection();
      Database::getConnection();
      // Got a packet bigger than 'max_allowed_packet' bytes exception thrown.
      $this->assertEquals(1153, $e->getPrevious()->errorInfo[1]);
      // 'max_allowed_packet' exception message truncated.
      // Use strlen() to count the bytes exactly, not the unicode chars.
      $this->assertLessThanOrEqual($max_allowed_packet, strlen($e->getMessage()));
    }
  }

}