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From d..@apache.org
Subject svn commit: r1550308 - in /db/derby/code/trunk/java/testing/org/apache/derbyTesting: functionTests/tests/lang/ junit/
Date Wed, 11 Dec 2013 23:10:06 GMT
Author: dag
Date: Wed Dec 11 23:10:05 2013
New Revision: 1550308

URL: http://svn.apache.org/r1550308
Log:
DERBY-532 Support deferrable constraints

Patch derby-532-test-speedup changes ConstraintCharacteristicsTest to
use a main memory database for some tests for increased speed. It also
changes the way SystemPropertyTestSetup for static properties closes
down the database to not deregister the driver; without this change we
saw a test setup try to connect via the client driver to a Derby server
engine without a registered driver.


Modified:
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/functionTests/tests/lang/ConstraintCharacteristicsTest.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/ConnectionPoolDataSourceConnector.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/Connector.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DataSourceConnector.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DriverManagerConnector.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/SystemPropertyTestSetup.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/TestConfiguration.java
    db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/XADataSourceConnector.java

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/functionTests/tests/lang/ConstraintCharacteristicsTest.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/functionTests/tests/lang/ConstraintCharacteristicsTest.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/functionTests/tests/lang/ConstraintCharacteristicsTest.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/functionTests/tests/lang/ConstraintCharacteristicsTest.java
Wed Dec 11 23:10:05 2013
@@ -46,6 +46,7 @@ import org.apache.derby.iapi.services.co
 import org.apache.derby.iapi.sql.conn.LanguageConnectionContext;
 import org.apache.derby.impl.jdbc.EmbedConnection;
 import org.apache.derby.impl.sql.GenericPreparedStatement;
+import org.apache.derbyTesting.functionTests.tests.memorydb.MemoryDbManager;
 import org.apache.derbyTesting.junit.BaseJDBCTestCase;
 import org.apache.derbyTesting.junit.J2EEDataSource;
 import org.apache.derbyTesting.junit.JDBC;
@@ -67,6 +68,12 @@ public class ConstraintCharacteristicsTe
     static boolean exportFilesCreatedEmbedded = false;
     static boolean exportFilesCreatedClient = false;
 
+    // Use in memory database for speed for some tests
+    private static final MemoryDbManager dbm =
+            MemoryDbManager.getSharedInstance();
+
+    final static int WAIT_TIMEOUT_DURATION = 1;
+
     public ConstraintCharacteristicsTest(String name) {
         super(name);
     }
@@ -89,9 +96,12 @@ public class ConstraintCharacteristicsTe
         // Need to set a property to allow non default characteristics until
         // feature completed: remove then
         Properties systemProperties = new Properties();
-        systemProperties.setProperty("derby.constraintsTesting", "true");
-        systemProperties.setProperty("derby.locks.waitTimeout", "2");
-        TestSuite s = new TestSuite("WithLenientChecking");
+        systemProperties.setProperty(
+            "derby.constraintsTesting", "true");
+        systemProperties.setProperty(
+            "derby.locks.waitTimeout", Integer.toString(WAIT_TIMEOUT_DURATION));
+        TestSuite s = new TestSuite(
+            "WithLenientChecking");
 
         s.addTest(new ConstraintCharacteristicsTest(
                       "testDropNotNullOnUniqueColumn"));
@@ -128,7 +138,7 @@ public class ConstraintCharacteristicsTe
         s.addTest(new ConstraintCharacteristicsTest(
                       "testAlmostRemovedAllDups"));
 
-        suite.addTest(new SystemPropertyTestSetup(s, systemProperties));
+        suite.addTest(new SystemPropertyTestSetup(s, systemProperties, true));
 
         return new SupportFilesSetup(suite);
     }
@@ -182,17 +192,22 @@ public class ConstraintCharacteristicsTe
         setAutoCommit(true);
         getConnection().createStatement().
                 executeUpdate("drop table referenced");
+        dbm.cleanUp();
         super.tearDown();
     }
 
     public void testSyntaxAndBinding() throws SQLException {
-        Statement s = getConnection().createStatement();
+        Connection c = dbm.createDatabase("cct");
+        c.setAutoCommit(false);
+        Statement s = c.createStatement();
+        s.executeUpdate("create table referenced(i int primary key)");
+        c.commit();
 
         /*
          * T A B L E    L E V E L    C O N S T R A I N T S
          */
 
-        assertTableLevelDefaultBehaviorAccepted(s);
+        assertTableLevelDefaultBehaviorAccepted(c, s);
         assertTableLevelFailTillFeatureImplemented(s);
 
         /*
@@ -227,13 +242,13 @@ public class ConstraintCharacteristicsTe
 
         // Unknown constraint name
         assertStatementError( "42X94", s, "set constraints cuckoo deferred");
-        rollback();
+        c.rollback();
 
         /*
          * C O L U M N    L E V E L    C O N S T R A I N T S
          */
 
-        assertColumnLevelDefaultBehaviorAccepted(s);
+        assertColumnLevelDefaultBehaviorAccepted(c, s);
         assertColumnLevelFailTillFeatureImplemented(s);
 
         // Characteristics are not currently allowed for NOT NULL,
@@ -1088,12 +1103,21 @@ public class ConstraintCharacteristicsTe
 
     final static long SIZE = (1024L * 1024L * 10) / 256;
     public void testManySimilarDuplicates() throws SQLException {
-        Statement s = createStatement();
+        if (usingDerbyNetClient()) {
+            // skip, too heavy fixture to do twice... we use
+            // in memory db in any case...
+            return;
+        }
+
+        Connection c = dbm.createDatabase("cct");
+        c.setAutoCommit(false);
+
+        Statement s = c.createStatement();
         try {
             s.executeUpdate(
                 "create table t (i varchar(256), " +
                     "constraint c primary key(i) initially deferred)");
-            PreparedStatement ps = prepareStatement("insert into t values ?");
+            PreparedStatement ps = c.prepareStatement("insert into t values ?");
             char[] value = new char[256];
             Arrays.fill(value, 'a');
             ps.setString(1, String.valueOf(value));
@@ -1102,18 +1126,10 @@ public class ConstraintCharacteristicsTe
             for (long l=0; l < SIZE; l++) {
                 ps.executeUpdate();
             }
-            commit();
+            c.commit();
         } catch (SQLException e) {
             assertSQLState(LANG_DEFERRED_CONSTRAINTS_VIOLATION, e);
             s.executeUpdate("call syscs_util.syscs_checkpoint_database()");
-        } finally {
-            // clean up resources
-            try {
-                s.executeUpdate("drop table t");
-            } catch (SQLException e) {
-                // ignore, more interested in original exception
-            }
-            commit();
         }
     }
 
@@ -1172,13 +1188,14 @@ public class ConstraintCharacteristicsTe
         }
     }
 
-    private void setupTab1() throws SQLException {
-        Statement stmt = createStatement();
+    private static void setupTab1(String db) throws SQLException {
+        Connection c = dbm.getConnection(db);
+        Statement stmt = c.createStatement();
         stmt.execute(
                 "create table tab1 (i integer)");
         stmt.executeUpdate(
                 "alter table tab1 add constraint con1 unique (i) deferrable");
-        PreparedStatement ps = prepareStatement("insert into tab1 " +
+        PreparedStatement ps = c.prepareStatement("insert into tab1 " +
                 "values (?)");
 
         for (int i = 0; i < 10; i++) {
@@ -1188,15 +1205,16 @@ public class ConstraintCharacteristicsTe
 
         ps.close();
         stmt.close();
-        commit();
+        c.commit();
     }
 
 
-    private void dropTab1() throws SQLException {
-        Statement stmt = createStatement();
+    private static void dropTab1(String db) throws SQLException {
+        Connection c = dbm.getConnection(db);
+        Statement stmt = c.createStatement();
         try {
             stmt.execute("drop table tab1");
-            commit();
+            c.commit();
         } catch (SQLException e) {
             // ignore so we get to see original exception if there is one
         }
@@ -1223,18 +1241,21 @@ public class ConstraintCharacteristicsTe
      * saw a the lock time-out error.
      */
     public void testLockingWithCommit () throws Exception {
-        setupTab1();
+        final String db = "cct";
+        dbm.createDatabase(db).close();
+        setupTab1(db);
 
         try {
             for (int i = 0; i < 4; i++) {
                 for (int j = 0; j < 4; j++) {
                     executeThreads(
-                            (int)Math.pow(2,i),
-                            (int)Math.pow(2,j), true);
+                        db,
+                        (int)Math.pow(2,i),
+                        (int)Math.pow(2,j), true);
                 }
             }
         } finally {
-            dropTab1();
+            dropTab1(db);
         }
     }
 
@@ -1245,18 +1266,21 @@ public class ConstraintCharacteristicsTe
      * See also comment for {@link #testLockingWithCommit() }.
      */
     public void testLockingWithRollback () throws Exception {
-        setupTab1();
+        final String db = "cct";
+        dbm.createDatabase(db).close();
+        setupTab1(db);
 
         try {
             for (int i = 0; i < 4; i++) {
                 for (int j = 0; j < 4; j++) {
                     executeThreads(
-                            (int)Math.pow(2,i),
-                            (int)Math.pow(2,j), false);
+                        db,
+                        (int)Math.pow(2,i),
+                        (int)Math.pow(2,j), false);
                 }
             }
         } finally {
-            dropTab1();
+            dropTab1(db);
         }
     }
 
@@ -1266,6 +1290,7 @@ public class ConstraintCharacteristicsTe
      * first transaction is committed or rolled back based on third
      * parameter (boolean commit).
      *
+     * @param db string of in-memory db to use
      * @param isolation1 isolation level for 1st thread
      * @param isolation2 isolation level for 2nd thread
      * @param commit whether or not to commit
@@ -1273,11 +1298,16 @@ public class ConstraintCharacteristicsTe
      * (Lifted from UniqueConstraintMultiThrededTest to test with deferrable
      * constraint.)
      */
-    private void executeThreads (int isolation1, int isolation2,
-            boolean commit) throws Exception {
-        Connection con1 = openDefaultConnection();
+    private static void executeThreads (
+        String db,
+        int isolation1,
+        int isolation2,
+        boolean commit) throws Exception {
+
+        Connection con1 = dbm.getConnection(db);
         con1.setTransactionIsolation(isolation1);
-        Connection con2 = openDefaultConnection();
+        Connection con2 = dbm.getConnection(db);
+
         try {
             con2.setTransactionIsolation(isolation2);
             DBOperations dbo1 = new DBOperations (con1, 5);
@@ -1285,15 +1315,15 @@ public class ConstraintCharacteristicsTe
             dbo1.delete();
             Thread t = new Thread (dbo2);
             t.start();
-            //wait for 2 sec should be enough for dbo2 so on wait
-            t.sleep(2000);
+
+            t.sleep((WAIT_TIMEOUT_DURATION * 1000) / 2 );
+
             if (commit) {
                 dbo1.rollback();
                 t.join();
                 assertSQLState("isolation levels: " + isolation1
                         + " " + isolation2, "23505", dbo2.getException());
-            }
-            else {
+            } else {
                 dbo1.commit();
                 t.join();
                 assertNull("isolation levels: " + isolation1
@@ -1454,7 +1484,7 @@ public class ConstraintCharacteristicsTe
 
      * @throws SQLException
      */
-    private void assertTableLevelFailTillFeatureImplemented(
+    private static void assertTableLevelFailTillFeatureImplemented(
             Statement s) throws SQLException {
 
         for (String ct : tableConstraintTypes) {
@@ -1476,7 +1506,7 @@ public class ConstraintCharacteristicsTe
 
      * @throws SQLException
      */
-    private void assertColumnLevelFailTillFeatureImplemented(
+    private static void assertColumnLevelFailTillFeatureImplemented(
             Statement s) throws SQLException {
 
         for (String ct : columnConstraintTypes) {
@@ -1493,18 +1523,20 @@ public class ConstraintCharacteristicsTe
      * Assert that we accept characteristics that merely specify the default
      * behavior anyway.
      *
+     * @param c connection
      * @param s statement
      *
      * @throws SQLException
      */
-    private void assertTableLevelDefaultBehaviorAccepted (
+    private static void assertTableLevelDefaultBehaviorAccepted (
+            Connection c,
             Statement s) throws SQLException {
 
         for (String ct : tableConstraintTypes) {
             for (String[] ch : defaultCharacteristics) {
                 assertUpdateCount(s, 0,
                     "create table t(i int, constraint c " + ct + ch[0] + ")");
-                rollback();
+                c.rollback();
             }
         }
     }
@@ -1513,18 +1545,20 @@ public class ConstraintCharacteristicsTe
      * Assert that we accept characteristics that merely specify the default
      * behavior anyway.
      *
+     * @param c connection
      * @param s statement
      *
      * @throws SQLException
      */
-    private void assertColumnLevelDefaultBehaviorAccepted (
+    private static void assertColumnLevelDefaultBehaviorAccepted (
+            Connection c,
             Statement s) throws SQLException {
 
         for (String ct : columnConstraintTypes) {
             for (String ch[] : defaultCharacteristics) {
                 assertUpdateCount(s, 0,
                     "create table t(i int " + ct + ch[0] + ")");
-                rollback();
+                c.rollback();
             }
         }
     }

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/ConnectionPoolDataSourceConnector.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/ConnectionPoolDataSourceConnector.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/ConnectionPoolDataSourceConnector.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/ConnectionPoolDataSourceConnector.java
Wed Dec 11 23:10:05 2013
@@ -29,6 +29,7 @@ import java.util.Properties;
 import javax.sql.ConnectionPoolDataSource;
 
 import junit.framework.AssertionFailedError;
+import org.apache.derby.shared.common.sanity.SanityManager;
 
 /**
  * Connection factory using javax.sql.ConnectionPoolDataSource.
@@ -173,7 +174,12 @@ public class ConnectionPoolDataSourceCon
         config.waitForShutdownComplete(getDatabaseName());
     }
 
-    public void shutEngine() throws SQLException {
+    public void shutEngine(boolean deregisterDriver) throws SQLException {
+        if (SanityManager.DEBUG) {
+             // "false" only used with driver manager
+            SanityManager.ASSERT(deregisterDriver);
+        }
+
         ConnectionPoolDataSource tmpDs =
                 singleUseDS( DataSourceConnector.makeShutdownDBAttributes( config ) );
         JDBCDataSource.setBeanProperty(tmpDs, "databaseName", "");

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/Connector.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/Connector.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/Connector.java (original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/Connector.java Wed Dec
11 23:10:05 2013
@@ -104,8 +104,9 @@ interface Connector {
      * This method can only be called when the
      * engine is running embedded in this JVM.
      * Return nothing, exception is expected to be thrown with SQLState XJ015
+     * @param deregisterDriver if true, deregister driver
      */
-    abstract void shutEngine() throws SQLException;
+    abstract void shutEngine(boolean deregisterDriver) throws SQLException;
    
     /**
      * Set the login timeout for getting connections. Timeout is measured in seconds.

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DataSourceConnector.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DataSourceConnector.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DataSourceConnector.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DataSourceConnector.java
Wed Dec 11 23:10:05 2013
@@ -26,6 +26,7 @@ import java.util.Map;
 import java.util.Properties;
 
 import javax.sql.DataSource;
+import org.apache.derby.shared.common.sanity.SanityManager;
 
 
 /**
@@ -139,7 +140,12 @@ public class DataSourceConnector impleme
         config.waitForShutdownComplete(getDatabaseName());
     }
 
-    public void shutEngine() throws SQLException {
+    public void shutEngine(boolean deregisterDriver) throws SQLException {
+        if (SanityManager.DEBUG) {
+             // "false" only used with driver manager
+            SanityManager.ASSERT(deregisterDriver);
+        }
+
         DataSource tmpDs = singleUseDS( makeShutdownDBAttributes( config ) );
         JDBCDataSource.setBeanProperty(tmpDs, "databaseName", "");
         tmpDs.getConnection();

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DriverManagerConnector.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DriverManagerConnector.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DriverManagerConnector.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/DriverManagerConnector.java
Wed Dec 11 23:10:05 2013
@@ -22,6 +22,7 @@ package org.apache.derbyTesting.junit;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.SQLException;
+import java.util.Enumeration;
 import java.util.Properties;
 
 /**
@@ -154,8 +155,9 @@ public class DriverManagerConnector impl
      * with the user and password defined by the configuration.
      */
     public void shutDatabase() throws SQLException {
-        getConnectionByAttributes(config.getJDBCUrl(),
-                "shutdown", "true");
+        Properties p = new Properties();
+        p.setProperty("shutdown", "true");
+        getConnectionByAttributes(config.getJDBCUrl(), p);
         config.waitForShutdownComplete(getDatabaseName());
     }
 
@@ -165,10 +167,18 @@ public class DriverManagerConnector impl
      * by the configuration.
      * Always shutsdown using the embedded URL thus this
      * method will not work in a remote testing environment.
+     * @param deregisterDriver
+     * @throws java.sql.SQLException
      */
-    public void shutEngine() throws SQLException {
+    public void shutEngine(boolean deregisterDriver) throws SQLException {
+        Properties p = new Properties();
+        p.setProperty("shutdown", "true");
         
-        getConnectionByAttributes("jdbc:derby:", "shutdown", "true");
+        if (!deregisterDriver) {
+            p.setProperty("deregister", "false");
+        }
+
+        getConnectionByAttributes("jdbc:derby:", p);
     }
     
     public void setLoginTimeout( int seconds ) throws SQLException
@@ -186,14 +196,20 @@ public class DriverManagerConnector impl
      * The attributes user and password are set from the configuration
      * and then the passed in attribute is set.
      */
-    private Connection getConnectionByAttributes(String url, String key, String value)
+    private Connection getConnectionByAttributes(
+            String url,
+            Properties p)
         throws SQLException
     {
         Properties attributes = new Properties();
 
         attributes.setProperty("user", config.getUserName());
         attributes.setProperty("password", config.getUserPassword());
-        attributes.setProperty(key, value);
+
+        for (Enumeration e = p.keys(); e.hasMoreElements(); ) {
+            String key = (String)e.nextElement();
+            attributes.setProperty(key, p.getProperty(key));
+        }
 
         try {
             DriverManager.getDriver(url);

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/SystemPropertyTestSetup.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/SystemPropertyTestSetup.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/SystemPropertyTestSetup.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/SystemPropertyTestSetup.java
Wed Dec 11 23:10:05 2013
@@ -109,12 +109,17 @@ public class SystemPropertyTestSetup ext
     	// during the tearDown of SystemPropertyTestSetup during the 
     	// decorator's reuse.
 		this.oldValues = new Properties();
-    	// shutdown engine so static properties take effect
-        // shutdown the engine before setting the properties. this
+
+        // Shutdown engine so static properties take effect.
+        // Shutdown the engine before setting the properties. This
         // is because the properties may change authentication settings
         // to NATIVE authentication and we may be missing a credentials DB.
-    	if (staticProperties)
-    	{ TestConfiguration.getCurrent().shutdownEngine(); }
+        if (staticProperties) {
+            // Use deregister == false here lest in client server mode
+            // we try to connect to a network server without an embedded
+            // driver registered. Issue seen with ConstraintCharacteristicsTest.
+            TestConfiguration.getCurrent().shutdownEngine(false);
+        }
         
     	setProperties(newValues);
     }

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/TestConfiguration.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/TestConfiguration.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/TestConfiguration.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/TestConfiguration.java
Wed Dec 11 23:10:05 2013
@@ -1792,7 +1792,25 @@ public final class TestConfiguration {
     public void shutdownEngine()
     {
         try {
-            connector.shutEngine();
+            connector.shutEngine(true);
+            Assert.fail("Engine failed to shut down");
+        } catch (SQLException e) {
+             BaseJDBCTestCase.assertSQLState("Engine shutdown", "XJ015", e);
+        }
+    }
+
+    /**
+     * Shutdown the engine for this configuration
+     * assuming it is booted.
+     * This method can only be called when the engine
+     * is running embedded in this JVM.
+     *
+     * @param deregisterDeriver if true, deregister the driver
+     */
+    public void shutdownEngine(boolean deregisterDeriver)
+    {
+        try {
+            connector.shutEngine(deregisterDeriver);
             Assert.fail("Engine failed to shut down");
         } catch (SQLException e) {
              BaseJDBCTestCase.assertSQLState("Engine shutdown", "XJ015", e);

Modified: db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/XADataSourceConnector.java
URL: http://svn.apache.org/viewvc/db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/XADataSourceConnector.java?rev=1550308&r1=1550307&r2=1550308&view=diff
==============================================================================
--- db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/XADataSourceConnector.java
(original)
+++ db/derby/code/trunk/java/testing/org/apache/derbyTesting/junit/XADataSourceConnector.java
Wed Dec 11 23:10:05 2013
@@ -142,7 +142,7 @@ public class XADataSourceConnector imple
         config.waitForShutdownComplete(getDatabaseName());
     }
 
-    public void shutEngine() throws SQLException {
+    public void shutEngine(boolean deregisterDriver) throws SQLException {
         Assert.fail("shutdown engine not implemened");
     }
     



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