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} } } } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } } Updating a Ref Object Updating a Ref object simply means making it point to a different row in the table. The following _doUpdateRef() method does that by first invoking the method _getRefForUpdate() to retrieve the Ref object and then invoking the method _updateEmployeeRef() to update the reference object in the table: private static void _doUpdateRef( Connection conn ) throws SQLException { Ref newManagerRef = _getRefForUpdate( conn, 1 ); _updateEmployeeRef( conn, 3, newManagerRef ); conn.commit(); } The definition of the method _getRefForUpdate() basically is the same as that of the method _doSelectRef() covered in section Querying a Ref Object earlier. The only difference is that it uses the for update nowait clause to lock the row so that another session does not update the same row before we complete our update. This problem, known as the lost update problem, along with its suggested solutions, is discussed in detail in 16. private static Ref _getRefForUpdate( Connection conn, int empNo ) throws SQLException { String stmtString = "select ref(e) " + " from emp_table_with_ref e " + " where e.emp_no = for update nowait"; PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, empNo ); rset = pstmt.executeQuery(); Ref managerRef = null; if(rset.next()) // only one row expected {

managerRef = rset.getRef( 1 ); } return managerRef; } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } } The method _updateEmployeeRef() takes the selected reference object and performs the actual update: private static void _updateEmployeeRef( Connection conn, int empNo, Ref newManagerRef ) throws SQLException { The statement string for the update simply sets the reference column manager to the passed value. Later, we use the method setRef() of the PreparedStatement interface to carry out the actual update. In this case, we effectively change the data so that Jack reports directly to Larry instead of reporting to John (a huge promotion, considering Larry is the CEO!). String updateStmtString = "update emp_table_with_ref e" + " set e.manager = " + " where e.emp_no = "; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( updateStmtString pstmt.setRef( 1, newManagerRef ); pstmt.setInt( 2, empNo ); pstmt.execute(); } finally { JDBCUtil.close( pstmt); } } } // end of program That wraps up our discussion of weakly typed Ref objects. In the next section, we look at how to use custom reference classes to query and update references.

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By clicking the Browser s View Source menu item, you can inspect the combination of HTML and JavaScript that was generated by the server control (see Figure 2-4). You can see that it is vastly different from what was shown at design time in Figure 2-2. The <asp:Calendar> tag has been replaced by a <div> tag that encapsulates the HTML. This lays out the calendar as a table showing the days, dates, and month; and the JavaScript that handles the links to move forward and backward by month.

As you may have guessed by now, we will use the JPublisher utility (see 7 for details on how to use this utility) to generate the custom classes for our reference objects. A custom reference class must satisfy the following requirements: It must implement the oracle.sql.ORAData and oracle.sql.ORADataFactory interfaces. It must provide a way to refer to the underlying object s data (JPublisher does this by using an underlying REF attribute). As in the case of collection classes, the standard SQLData interface supports only SQL object mappings; it does not support mappings for reference objects. Thus, if you instruct JPublisher to implement the standard SQLData interface in creating a custom object class, it will not generate a custom reference class. You must use the ORAData implementation for this purpose.

In this section, we will use the JPublisher utility to generate the reference classes for the object type emp_ref_type. We will use the following properties file (called prop.txt) for this purpose: jpub.user=benchmark/benchmark jpub.methods=all jpub.builtintypes=jdbc jpub.numbertypes=objectjdbc jpub.usertypes=oracle jpub.package=book.ch08.ref.jpub jpub.input=input.txt Note that you may need to modify the jpub.package property to give a package name according to your directory structure; this is the package to which the generated classes belong. The file input.txt referred to in the property jpub.input contains the following line: SQLEMP_TYPE AS Employee As you can see, we plan to generate a class Employee for our object type emp_ref_type. JPublisher will also generate the employee reference class (called EmployeeRef) automatically. We finally generate the custom reference classes by running the following command: Jpub props=prop.txt

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