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Next, we invoke the getORAData() method of the OracleResultSet interface. Notice how we invoke the static method getORADataFactory() of the generated class MyAddressORAData: MyAddressORAData address = (MyAddressORAData) orset.getORAData(1, MyAddressORAData.getORADataFactory() ); System.out.println( address.getAddress() ); } } finally { JDBCUtil.close( orset ); JDBCUtil.close( pstmt ); } } Selecting Objects Using the getObject() Method of ResultSet The second option for selecting objects is to use the standard getObject(index, map) method specified by the ResultSet interface to retrieve data as instances of ORAData. In this case, we must have an entry in the type map that identifies the factory class. This becomes clearer in the definition of the method _demoSelectUsingGetObject() as follows: private static void _demoSelectUsingGetObject( Connection connection) throws SQLException, ClassNotFoundException { PreparedStatement pstmt = null; ResultSet rset = null; try { In the following code, we populate a type map that maps the address object type to the class MyAddressORAData: HashMap myMap = new HashMap(); myMap.put( "BENCHMARK.ADDRESS", Class.forName(MyAddressORAData.class.getName() ) ); String selectStmt = "select value(a) from address_table a"; pstmt = connection.prepareStatement ( selectStmt ); rset = pstmt.executeQuery(); while ( rset.next() ) { When retrieving the object using the getObject() method, we also pass the type map, which informs the JDBC driver which class the object type maps to: MyAddressORAData address = (MyAddressORAData) rset.getObject(1, myMap ); System.out.println( address.getAddress() ); } }

finally { JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } Inserting Objects Using the setORAData() Method of OraclePreparedStatement There are two methods to insert objects. The first uses the setORAData() method of the Oracle extension interface OraclePreparedStatement (or OracleCallableStatement). The method signature is as follows. The method takes as input the column index of the data and an ORAData instance. public void setORAData (int colIndex, ORAData oradata) The method _demoInsertUsingSetORAData() defined as follows uses the setORAData() method as part of the process of inserting an object into address_table. The code is fairly self-explanatory. private static void _demoInsertUsingSetORAData( Connection connection) throws SQLException { OraclePreparedStatement opstmt = null; try { MyAddressORAData myAddress = new MyAddressORAData(); myAddress.setLine1("133 Ferry Rd"); myAddress.setLine2( "Apt # 24"); myAddress.setStreet( "Crypton St." ); myAddress.setCity( "Dallas"); myAddress.setState( "TX" ); myAddress.setZip( "75201" ); String insertStmt = "insert into address_table values( )"; opstmt = (OraclePreparedStatement) connection.prepareStatement ( insertStmt ); opstmt.setORAData (1, myAddress ); int rows = opstmt.executeUpdate(); System.out.println ( "Inserted " + rows + " row(s) " ); connection.commit(); } finally { JDBCUtil.close( opstmt ); } }

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As such, ZedGraph makes an excellent choice for use in an ASP.NET AJAX-based project and is easy to implement in your applications. You simply make a reference to the ZedGraph.DLL in your solution and add the ZedGraph tools to your Toolbox in the standard way.

Inserting Objects Using the setObject() Method of PreparedStatement The second method involves using the standard setObject() method of the Prepared Statement interface (or the CallableStatement interface), as demonstrated by the following _demoInsertUsingSetObject() method: private static void _demoInsertUsingSetObject( Connection connection) throws SQLException, ClassNotFoundException { PreparedStatement pstmt = null; try { MyAddressORAData myAddress = new MyAddressORAData(); myAddress.setLine1("134 Ferry Rd"); myAddress.setLine2( "Apt # 24"); myAddress.setStreet( "Crypton St." ); myAddress.setCity( "Dallas"); myAddress.setState( "TX" ); myAddress.setZip( "75201" ); String insertStmt = "insert into address_table values( )"; pstmt = connection.prepareStatement ( insertStmt ); pstmt.setObject (1, myAddress ); int rows = pstmt.executeUpdate(); System.out.println ( "Inserted " + rows + " row(s) " ); connection.commit(); } finally { JDBCUtil.close( pstmt ); } } Updating Objects As in the case of a SQLData-based implementation, you update an object by selecting it into memory, changing the in-memory Java object as required, and using the Java object to update the object value in the database, as shown in the following code. The phenomenon of lost updates mentioned earlier is applicable here, too; hence we use the phrase for update nowait during the select. The rest of the code uses concepts covered in earlier chapter sections. private static void _demoUpdate( Connection connection) throws SQLException, ClassNotFoundException { OraclePreparedStatement opstmt = null; PreparedStatement pstmt = null; OracleResultSet orset = null; try { MyAddressORAData myAddress = null;

String selectStmt = "select value(a) from address_table a"+ " where line1 = for update nowait"; pstmt = connection.prepareStatement ( selectStmt ); pstmt.setString( 1, "145 Apt # 7" ); orset = (OracleResultSet) pstmt.executeQuery(); if ( orset.next() ) { myAddress = (MyAddressORAData) orset.getORAData(1, MyAddressORAData.getORADataFactory() ); myAddress.setStreet ( "Wonderful St" ); String updateStmt = "update address_table a" + " set value(a) = " + " where a.line1 = "; opstmt = (OraclePreparedStatement) connection.prepareStatement ( updateStmt ); opstmt.setORAData (1, myAddress ); opstmt.setString (2, "145 Apt # 7" ); int rows = opstmt.executeUpdate(); System.out.println ( "Updated " + rows + " rows " ); } connection.commit(); } finally { JDBCUtil.close( orset ); JDBCUtil.close( opstmt ); } } Deleting Objects There is nothing special about deleting an object. It is a simple relational statement, as illustrated in the following _demoDelete() method: private static void _demoDelete( Connection connection) throws SQLException, ClassNotFoundException { PreparedStatement pstmt = null; try { String deleteStmt = "delete address_table a" + " where a.line1 like "; pstmt = connection.prepareStatement ( deleteStmt ); pstmt.setString (1, "Mountain View" ); int rows = pstmt.executeUpdate(); System.out.println ( "Deleted " + rows + " row(s) " ); connection.commit(); }

finally { JDBCUtil.close( pstmt ); } } } Now that you know how to use the SQLData interface and the Oracle extension interfaces ORAData and ORADataFactory, let s compare the two approaches.

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