fix casting pooled connections to PGStatement problem patch by JariP

src/interfaces/jdbc/org/postgresql/jdbc2/optional/PooledConnectionImpl.java

@@ -14,7 +14,7 @@ import org.postgresql.PGConnection;
  *
  * @author Aaron Mulder (ammulder@chariotsolutions.com)
  * @author Csaba Nagy (ncsaba@yahoo.com)
- * @version $Revision: 1.7 $
+ * @version $Revision: 1.8 $
  */
 public class PooledConnectionImpl implements PooledConnection
 {
@@ -266,17 +266,17 @@ public class PooledConnectionImpl implements PooledConnection
             else if(method.getName().equals("createStatement"))
             {
                 Statement st = (Statement)method.invoke(con, args);
-                return Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{Statement.class}, new StatementHandler(this, st));
+                return Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{Statement.class, org.postgresql.PGStatement.class}, new StatementHandler(this, st));
             }
             else if(method.getName().equals("prepareCall"))
             {
                 Statement st = (Statement)method.invoke(con, args);
-                return Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{CallableStatement.class}, new StatementHandler(this, st));
+                return Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{CallableStatement.class, org.postgresql.PGStatement.class}, new StatementHandler(this, st));
             }
             else if(method.getName().equals("prepareStatement"))
             {
                 Statement st = (Statement)method.invoke(con, args);
-                return Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{PreparedStatement.class}, new StatementHandler(this, st));
+                return Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{PreparedStatement.class, org.postgresql.PGStatement.class}, new StatementHandler(this, st));
             }
 			else
 			{

src/interfaces/jdbc/org/postgresql/test/jdbc2/optional/ConnectionPoolTest.java

@@ -11,7 +11,7 @@ import java.sql.*;
  * interface to the PooledConnection is through the CPDS.
  *
  * @author Aaron Mulder (ammulder@chariotsolutions.com)
- * @version $Revision: 1.7 $
+ * @version $Revision: 1.8 $
  */
 public class ConnectionPoolTest extends BaseDataSourceTest
 {
@@ -422,6 +422,29 @@ public class ConnectionPoolTest extends BaseDataSourceTest
         }
     }
 
+    /**
+     * Ensure that a statement created from a pool can be used
+     * like any other statement in regard to pg extensions.
+     */
+    public void testStatementsProxyPGStatement() {
+	try {
+	    PooledConnection pc = getPooledConnection();
+	    con = pc.getConnection();
+	    
+	    Statement s = con.createStatement();
+	    boolean b = ((org.postgresql.PGStatement)s).isUseServerPrepare();
+
+	    PreparedStatement ps = con.prepareStatement("select 'x'");
+	    b = ((org.postgresql.PGStatement)ps).isUseServerPrepare();
+
+            CallableStatement cs = con.prepareCall("select 'x'");
+	    b = ((org.postgresql.PGStatement)cs).isUseServerPrepare();
+
+	} catch (SQLException e) {
+	    fail(e.getMessage());
+	}
+    }
+
     /**
 	 * Helper class to remove a listener during event dispatching.
 	 */