Removed Driver::getDatabase() in favor of Connection::getDatabase()

UPGRADE.md

@@ -1,5 +1,11 @@
 # Upgrade to 3.0
 
+## BC BREAK: Changes in obtaining the currently selected database name
+
+- The `Doctrine\DBAL\Driver::getDatabase()` method has been removed. Please use `Doctrine\DBAL\Connection::getDatabase()` instead.
+- `Doctrine\DBAL\Connection::getDatabase()` will always return the name of the database currently connected to, regardless of the configuration parameters and will initialize a database connection if it's not yet established.
+- A call to `Doctrine\DBAL\Connection::getDatabase()`, when connected to an SQLite database, will no longer return the database file path.
+
 ## BC BREAK: Changes in handling string and binary columns
 
 - When generating schema DDL, DBAL no longer provides the default length for string and binary columns. The application may need to provide the column length if required by the target platform.

lib/Doctrine/DBAL/Connection.php

@@ -205,11 +205,23 @@ public function getParams() : array
     }
 
     /**
-     * Gets the name of the database this Connection is connected to.
+     * Gets the name of the currently selected database.
+     *
+     * @return string|null The name of the database or NULL if a database is not selected.
+     *                     The platforms which don't support the concept of a database (e.g. embedded databases)
+     *                     must always return a string as an indicator of an implicitly selected database.
+     *
+     * @throws DBALException
      */
     public function getDatabase() : ?string
     {
-        return $this->_driver->getDatabase($this);
+        $platform = $this->getDatabasePlatform();
+        $query    = $platform->getDummySelectSQL($platform->getCurrentDatabaseExpression());
+        $database = $this->query($query)->fetchColumn();
+
+        assert(is_string($database) || $database === null);
+
+        return $database;
     }
 
     /**

lib/Doctrine/DBAL/Driver.php

@@ -44,11 +44,4 @@ public function getDatabasePlatform() : AbstractPlatform;
      * database schema of the platform this driver connects to.
      */
     public function getSchemaManager(Connection $conn) : AbstractSchemaManager;
-
-    /**
-     * Gets the name of the database connected to for this driver.
-     *
-     * @return string|null The name of the database or NULL if no database is currently selected.
-     */
-    public function getDatabase(Connection $conn) : ?string;
 }

lib/Doctrine/DBAL/Driver/AbstractDB2Driver.php

@@ -16,16 +16,6 @@
  */
 abstract class AbstractDB2Driver implements Driver
 {
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['dbname'];
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php

@@ -193,16 +193,6 @@ private function getMariaDbMysqlVersionNumber(string $versionString) : string
         return $versionParts['major'] . '.' . $versionParts['minor'] . '.' . $versionParts['patch'];
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['dbname'] ?? $conn->query('SELECT DATABASE()')->fetchColumn();
-    }
-
     /**
      * {@inheritdoc}
      *

lib/Doctrine/DBAL/Driver/AbstractOracleDriver.php

@@ -63,16 +63,6 @@ public function convertException(string $message, DriverExceptionInterface $exce
         return new DriverException($message, $exception);
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['user'];
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Driver/AbstractPostgreSQLDriver.php

@@ -107,16 +107,6 @@ public function createDatabasePlatformForVersion(string $version) : AbstractPlat
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['dbname'] ?? $conn->query('SELECT CURRENT_DATABASE()')->fetchColumn();
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Driver/AbstractSQLAnywhereDriver.php

@@ -89,16 +89,6 @@ public function createDatabasePlatformForVersion(string $version) : AbstractPlat
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['dbname'] ?? $conn->query('SELECT DB_NAME()')->fetchColumn();
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Driver/AbstractSQLServerDriver.php

@@ -51,16 +51,6 @@ public function createDatabasePlatformForVersion(string $version) : AbstractPlat
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['dbname'] ?? $conn->query('SELECT DB_NAME()')->fetchColumn();
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Driver/AbstractSQLiteDriver.php

@@ -76,16 +76,6 @@ public function convertException(string $message, DriverExceptionInterface $exce
         return new DriverException($message, $exception);
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDatabase(Connection $conn) : ?string
-    {
-        $params = $conn->getParams();
-
-        return $params['path'] ?? '';
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -1112,6 +1112,11 @@ public function getBitOrComparisonExpression(string $value1, string $value2) : s
         return '(' . $value1 . ' | ' . $value2 . ')';
     }
 
+    /**
+     * Returns the SQL expression which represents the currently selected database.
+     */
+    abstract public function getCurrentDatabaseExpression() : string;
+
     /**
      * Returns the FOR UPDATE expression.
      */

lib/Doctrine/DBAL/Platforms/DB2Platform.php

@@ -794,6 +794,14 @@ public function getSubstringExpression(string $string, string $start, ?string $l
         return sprintf('SUBSTR(%s, %s, %s)', $string, $start, $length);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return 'CURRENT_USER';
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Platforms/MySqlPlatform.php

@@ -117,6 +117,14 @@ public function getDateDiffExpression(string $date1, string $date2) : string
         return 'DATEDIFF(' . $date1 . ', ' . $date2 . ')';
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return 'DATABASE()';
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Platforms/OraclePlatform.php

@@ -145,6 +145,14 @@ public function getBitAndComparisonExpression(string $value1, string $value2) :
         return 'BITAND(' . $value1 . ', ' . $value2 . ')';
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return "SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')";
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php

@@ -125,6 +125,14 @@ public function getDateDiffExpression(string $date1, string $date2) : string
         return '(DATE(' . $date1 . ')-DATE(' . $date2 . '))';
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return 'CURRENT_DATABASE()';
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Platforms/SQLAnywherePlatform.php

@@ -1124,6 +1124,14 @@ public function getTrimExpression(string $str, int $mode = TrimMode::UNSPECIFIED
         }
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return 'DB_NAME()';
+    }
+
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php

@@ -1097,6 +1097,14 @@ public function getLengthExpression(string $string) : string
         return 'LEN(' . $string . ')';
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return 'DB_NAME()';
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Platforms/SqlitePlatform.php

@@ -150,6 +150,19 @@ public function getDateDiffExpression(string $date1, string $date2) : string
         return sprintf("JULIANDAY(%s, 'start of day') - JULIANDAY(%s, 'start of day')", $date1, $date2);
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * The SQLite platform doesn't support the concept of a database, therefore, it always returns an empty string
+     * as an indicator of an implicitly selected database.
+     *
+     * @see \Doctrine\DBAL\Connection::getDatabase()
+     */
+    public function getCurrentDatabaseExpression() : string
+    {
+        return "''";
+    }
+
     /**
      * {@inheritDoc}
      */

tests/Doctrine/Tests/DBAL/Driver/AbstractDriverTest.php

@@ -140,23 +140,6 @@ public function testThrowsExceptionOnCreatingDatabasePlatformsForInvalidVersion(
         $this->driver->createDatabasePlatformForVersion('foo');
     }
 
-    public function testReturnsDatabaseName() : void
-    {
-        $params = [
-            'user'     => 'foo',
-            'password' => 'bar',
-            'dbname'   => 'baz',
-        ];
-
-        $connection = $this->getConnectionMock();
-
-        $connection->expects($this->once())
-            ->method('getParams')
-            ->will($this->returnValue($params));
-
-        self::assertSame($params['dbname'], $this->driver->getDatabase($connection));
-    }
-
     public function testReturnsDatabasePlatform() : void
     {
         self::assertEquals($this->createPlatform(), $this->driver->getDatabasePlatform());

tests/Doctrine/Tests/DBAL/Driver/AbstractMySQLDriverTest.php

@@ -7,7 +7,6 @@
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Driver;
 use Doctrine\DBAL\Driver\AbstractMySQLDriver;
-use Doctrine\DBAL\Driver\ResultStatement;
 use Doctrine\DBAL\Platforms\AbstractPlatform;
 use Doctrine\DBAL\Platforms\MariaDb1027Platform;
 use Doctrine\DBAL\Platforms\MySQL57Platform;
@@ -18,35 +17,6 @@
 
 class AbstractMySQLDriverTest extends AbstractDriverTest
 {
-    public function testReturnsDatabaseName() : void
-    {
-        parent::testReturnsDatabaseName();
-
-        $database = 'bloo';
-        $params   = [
-            'user'     => 'foo',
-            'password' => 'bar',
-        ];
-
-        $statement = $this->createMock(ResultStatement::class);
-
-        $statement->expects($this->once())
-            ->method('fetchColumn')
-            ->will($this->returnValue($database));
-
-        $connection = $this->getConnectionMock();
-
-        $connection->expects($this->once())
-            ->method('getParams')
-            ->will($this->returnValue($params));
-
-        $connection->expects($this->once())
-            ->method('query')
-            ->will($this->returnValue($statement));
-
-        self::assertSame($database, $this->driver->getDatabase($connection));
-    }
-
     protected function createDriver() : Driver
     {
         return $this->getMockForAbstractClass(AbstractMySQLDriver::class);