[DBAL-1220] Fix dropping database with active connection on PostgreSQL

lib/Doctrine/DBAL/Platforms/PostgreSQL92Platform.php

@@ -72,4 +72,12 @@ protected function initializeDoctrineTypeMappings()
         parent::initializeDoctrineTypeMappings();
         $this->doctrineTypeMapping['json'] = 'json_array';
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCloseActiveDatabaseConnectionsSQL($database)
+    {
+        return "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = '$database'";
+    }
 }

lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php

@@ -420,6 +420,34 @@ public function getCreateDatabaseSQL($name)
         return 'CREATE DATABASE ' . $name;
     }
 
+    /**
+     * Returns the SQL statement for disallowing new connections on the given database.
+     *
+     * This is useful to force DROP DATABASE operations which could fail because of active connections.
+     *
+     * @param string $database The name of the database to disallow new connections for.
+     *
+     * @return string
+     */
+    public function getDisallowDatabaseConnectionsSQL($database)
+    {
+        return "UPDATE pg_database SET datallowconn = 'false' WHERE datname = '$database'";
+    }
+
+    /**
+     * Returns the SQL statement for closing currently active connections on the given database.
+     *
+     * This is useful to force DROP DATABASE operations which could fail because of active connections.
+     *
+     * @param string $database The name of the database to close currently active connections for.
+     *
+     * @return string
+     */
+    public function getCloseActiveDatabaseConnectionsSQL($database)
+    {
+        return "SELECT pg_terminate_backend(procpid) FROM pg_stat_activity WHERE datname = '$database'";
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Schema/PostgreSqlSchemaManager.php

@@ -19,6 +19,7 @@
 
 namespace Doctrine\DBAL\Schema;
 
+use Doctrine\DBAL\Exception\DriverException;
 use Doctrine\DBAL\Types\Type;
 
 /**
@@ -100,6 +101,33 @@ public function determineExistingSchemaSearchPaths()
         });
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function dropDatabase($database)
+    {
+        try {
+            parent::dropDatabase($database);
+        } catch (DriverException $exception) {
+            // If we have a SQLSTATE 55006, the drop database operation failed
+            // because of active connections on the database.
+            // To force dropping the database, we first have to close all active connections
+            // on that database and issue the drop database operation again.
+            if ($exception->getSQLState() !== '55006') {
+                throw $exception;
+            }
+
+            $this->_execSql(
+                array(
+                    $this->_platform->getDisallowDatabaseConnectionsSQL($database),
+                    $this->_platform->getCloseActiveDatabaseConnectionsSQL($database),
+                )
+            );
+
+            parent::dropDatabase($database);
+        }
+    }
+
     /**
      * {@inheritdoc}
      */

tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php

@@ -40,6 +40,36 @@ protected function setUp()
         $this->_sm = $this->_conn->getSchemaManager();
     }
 
+    /**
+     * @group DBAL-1220
+     */
+    public function testDropsDatabaseWithActiveConnections()
+    {
+        if (! $this->_sm->getDatabasePlatform()->supportsCreateDropDatabase()) {
+            $this->markTestSkipped('Cannot drop Database client side with this Driver.');
+        }
+
+        $this->_sm->dropAndCreateDatabase('test_drop_database');
+
+        $this->assertContains('test_drop_database', $this->_sm->listDatabases());
+
+        $params = $this->_conn->getParams();
+        $params['dbname'] = 'test_drop_database';
+
+        $user = isset($params['user']) ? $params['user'] : null;
+        $password = isset($params['password']) ? $params['password'] : null;
+
+        $connection = $this->_conn->getDriver()->connect($params, $user, $password);
+
+        $this->assertInstanceOf('Doctrine\DBAL\Driver\Connection', $connection);
+
+        $this->_sm->dropDatabase('test_drop_database');
+
+        $this->assertNotContains('test_drop_database', $this->_sm->listDatabases());
+
+        unset($connection);
+    }
+
     /**
      * @group DBAL-195
      */

tests/Doctrine/Tests/DBAL/Functional/Schema/SqliteSchemaManagerTest.php

@@ -26,6 +26,32 @@ public function testCreateAndDropDatabase()
         $this->assertEquals(false, file_exists($path));
     }
 
+    /**
+     * @group DBAL-1220
+     */
+    public function testDropsDatabaseWithActiveConnections()
+    {
+        $this->_sm->dropAndCreateDatabase('test_drop_database');
+
+        $this->assertFileExists('test_drop_database');
+
+        $params = $this->_conn->getParams();
+        $params['dbname'] = 'test_drop_database';
+
+        $user = isset($params['user']) ? $params['user'] : null;
+        $password = isset($params['password']) ? $params['password'] : null;
+
+        $connection = $this->_conn->getDriver()->connect($params, $user, $password);
+
+        $this->assertInstanceOf('Doctrine\DBAL\Driver\Connection', $connection);
+
+        $this->_sm->dropDatabase('test_drop_database');
+
+        $this->assertFileNotExists('test_drop_database');
+
+        unset($connection);
+    }
+
     public function testRenameTable()
     {
         $this->createTestTable('oldname');

tests/Doctrine/Tests/DBAL/Platforms/AbstractPostgreSqlPlatformTestCase.php

@@ -792,4 +792,26 @@ public function testInitializesTsvectorTypeMapping()
         $this->assertTrue($this->_platform->hasDoctrineTypeMappingFor('tsvector'));
         $this->assertEquals('text', $this->_platform->getDoctrineTypeMapping('tsvector'));
     }
+
+    /**
+     * @group DBAL-1220
+     */
+    public function testReturnsDisallowDatabaseConnectionsSQL()
+    {
+        $this->assertSame(
+            "UPDATE pg_database SET datallowconn = 'false' WHERE datname = 'foo'",
+            $this->_platform->getDisallowDatabaseConnectionsSQL('foo')
+        );
+    }
+
+    /**
+     * @group DBAL-1220
+     */
+    public function testReturnsCloseActiveDatabaseConnectionsSQL()
+    {
+        $this->assertSame(
+            "SELECT pg_terminate_backend(procpid) FROM pg_stat_activity WHERE datname = 'foo'",
+            $this->_platform->getCloseActiveDatabaseConnectionsSQL('foo')
+        );
+    }
 }

tests/Doctrine/Tests/DBAL/Platforms/PostgreSQL92PlatformTest.php

@@ -56,4 +56,15 @@ public function testInitializesJsonTypeMapping()
         $this->assertTrue($this->_platform->hasDoctrineTypeMappingFor('json'));
         $this->assertEquals('json_array', $this->_platform->getDoctrineTypeMapping('json'));
     }
+
+    /**
+     * @group DBAL-1220
+     */
+    public function testReturnsCloseActiveDatabaseConnectionsSQL()
+    {
+        $this->assertSame(
+            "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = 'foo'",
+            $this->_platform->getCloseActiveDatabaseConnectionsSQL('foo')
+        );
+    }
 }