function ConnectionUnitTest::testOpenSelectQueryClose

Tests Database::closeConnection() with a select query.

File

core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php, line 187

Class

ConnectionUnitTest

Tests management of database connections.

Namespace

Code

public function testOpenSelectQueryClose() {
    // Only run this test for the 'mysql' driver.
    $driver = $this->connection
        ->driver();
    if ($driver !== 'mysql') {
        $this->markTestSkipped("MySql tests can not run for driver '{$driver}'.");
    }
    // Add and open a new connection.
    $this->addConnection();
    $id = $this->getConnectionId();
    Database::getConnection(static::TEST_TARGET_CONNECTION);
    // Verify that there is a new connection.
    $this->assertConnection($id);
    // Create a table.
    $name = 'foo';
    Database::getConnection(static::TEST_TARGET_CONNECTION)->schema()
        ->createTable($name, [
        'fields' => [
            'name' => [
                'type' => 'varchar',
                'length' => 255,
            ],
        ],
    ]);
    // Execute a query.
    Database::getConnection(static::TEST_TARGET_CONNECTION)->select('foo', 'f')
        ->fields('f', [
        'name',
    ])
        ->execute()
        ->fetchAll();
    // Drop the table.
    Database::getConnection(static::TEST_TARGET_CONNECTION)->schema()
        ->dropTable($name);
    // Close the connection.
    Database::closeConnection(static::TEST_TARGET_CONNECTION);
    // Wait 20ms to give the database engine sufficient time to react.
    usleep(20000);
    // Verify that we are back to the original connection count.
    $this->assertNoConnection($id);
}