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*/ import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.Ref; import oracle.jdbc.OracleConnection; import oracle.jdbc.OracleResultSet; import book.util.JDBCUtil; import book.util.Util; import book.ch11.ref.jpub.Employee; import book.ch11.ref.jpub.EmployeeRef; class DemoCustomRefQueryAndUpdate { public static void main(String args[]) throws SQLException { Util.checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); The method _doSelectRef() demonstrates how to select a Ref object: _doSelectRef( conn ); The method _doUpdateRef() demonstrates how to update a Ref object so that it points to a different row after the update: _doUpdateRef( conn ); } finally { // release JDBC resources in the finally clause. JDBCUtil.close( conn ); } } Querying a Ref Object The method _doSelectRef() is defined as follows: private static void _doSelectRef( Connection conn ) throws SQLException { We define a query statement that selects all columns of the table emp_table_with_ref including the reference column manager: String stmtString = "select e.emp_no, e.name, e.manager" + " from emp_table_with_ref e"; PreparedStatement pstmt = null;

Using AJAX, you can implement a solution that simply displays a visual indicator that the data is being loaded while it is being retrieved in the background Although the operation of retrieving and displaying the data takes about the same amount of time, the second example provides a much more dynamic look and feel The user is still in control while the data is being retrieved At any time, he can enter the code for a new company and retrieve its information without waiting for the first company s data to be loaded AJAX applications typically use HTML, JavaScript, and the associated technologies DHTML and Cascading Style Sheets (CSS) to build UIs When the interfaces need to change dynamically, a call to the server is usually made using the XMLHttpRequest object.

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OracleResultSet orset = null; try { pstmt = conn.prepareStatement( stmtString ); orset = (OracleResultSet) pstmt.executeQuery(); while(orset.next()) { int empNo = orset.getInt( 1 ); String name = orset.getString( 2 ); System.out.println("emp no : " + empNo ); System.out.println("emp name : " + name ); We use the method getORAData() of the OracleResultSet interface to retrieve the reference object as an object of class EmployeeRef: EmployeeRef managerRef = (EmployeeRef) orset.getORAData(3, EmployeeRef.getORADataFactory()); // retrieve the underlying object if( managerRef != null ) { We then use the method getValue() to retrieve the employee object to which this reference object points, and then print out all its attributes using the custom class generated methods: Employee manager = managerRef.getValue(); System.out.println("\t manager emp no" + manager.getEmpNo()); System.out.println("\t manager emp name" + manager.getName()); System.out.println("\t manager's manager ref " + manager.getManager()); } } } finally { JDBCUtil.close( orset); 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 {

EmployeeRef 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 the earlier section titled Querying a Ref Object. 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. Again, this problem, known as the lost update problem, along with its suggested solutions, is discussed in detail in 16. private static EmployeeRef _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; OracleResultSet orset = null; try { pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, empNo ); orset = (OracleResultSet) pstmt.executeQuery(); orset.next(); EmployeeRef managerRef = (EmployeeRef) orset.getORAData(1, EmployeeRef.getORADataFactory()); return managerRef; } finally { JDBCUtil.close( orset); JDBCUtil.close( pstmt); } } The method _updateEmployeeRef() takes the selected reference object and performs the actual update: private static void _updateEmployeeRef( Connection conn, int empNo, EmployeeRef newManagerRef ) throws SQLException {

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