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import book.util.JDBCUtil; import book.util.InputUtil; class DemoOptLockingBySavingOldValues { public static void main(String args[]) throws Exception { Connection conn = null; Object[] empDetails = null; try { conn = JDBCUtil.getConnection( "scott", "tiger", "ora10g" ); We initialize the variable empno with Martin s employee number, and then we invoke the method _displayEmpDetails. The method _displayEmpDetails prints out Martin s salary and name information, and also returns the current employee name and salary in an object array: int empNo = 7654; empDetails = _displayEmpDetails( conn, empNo ); We then introduce an artificial pause in our program by invoking InputUtil.waitTill UserHitsEnter() (discussed in section A Utility to Pause in a Java Program of 1) to simulate the time the end user takes to change the employee details before issuing the final update. This enables us to sneak in a conflicting update in our experimental runs: InputUtil.waitTillUserHitsEnter("Row has been selected but is not locked."); We invoke the _updateEmpInfo() method to update the employee information (we retain the old name but bump up the salary by $100, from $1,350 to $1,450): String oldEmpName = (String) empDetails[0]; int oldSalary = ((Integer) empDetails[1]).intValue(); _updateEmpInfo( conn, empNo, oldEmpName, oldSalary, "MARTIN", 1450 ); } finally { JDBCUtil.close ( conn ); } }// end of main The _displayEmpDetails method simply invokes the opt_lock_save_old_val_demo.get_ emp_details method to retrieve the employee details to be modified: private static Object[] _displayEmpDetails( Connection conn, int empNo ) throws SQLException { Object[] result = new Object[2]; CallableStatement cstmt = null; int salary = 0; String empName = null; try

{ cstmt = conn.prepareCall( "{call opt_lock_save_old_val_demo.get_emp_details( , , )}" ); cstmt.setInt( 1, empNo ); cstmt.registerOutParameter( 2, OracleTypes.VARCHAR ); cstmt.registerOutParameter( 3, OracleTypes.NUMBER ); cstmt.execute(); empName = cstmt.getString( 2 ); salary = cstmt.getInt( 3 ); System.out.println( "empno: " + empNo + ", name: " + empName + ", salary: " + salary ); result[0] = empName; result[1] = new Integer( salary ); } finally { JDBCUtil.close( cstmt ); } return result; } Toward the end of the class, we define the method _updateEmpInfo() that invokes the method opt_lock_save_old_val_demo.update_emp_info to update the employee details. Notice that we print an appropriate message depending on the number of rows successfully updated: private static void _updateEmpInfo( Connection conn, int empNo, String oldEmpName, int oldSalary, String newEmpName, int newSalary ) throws SQLException { CallableStatement cstmt = null; try { cstmt = conn.prepareCall( "{call opt_lock_save_old_val_demo.update_emp_info( , , , , , )}" ); cstmt.setInt( 1, empNo ); cstmt.setString( 2, oldEmpName ); cstmt.setInt( 3, oldSalary ); cstmt.setString( 4, newEmpName ); cstmt.setInt( 5, newSalary ); cstmt.registerOutParameter( 6, OracleTypes.NUMBER ); cstmt.execute(); int numOfRowsUpdated = cstmt.getInt( 6 ); if( numOfRowsUpdated <= 0 ) { System.out.println( "Sorry. Someone else changed the data that" + " you were trying to update. Please retry." ); }

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