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Package body created. Let s now look at the Java class, DemoOptLockingUsingShadowColumn, which invokes the opt_lock_shadowcol_demo package methods in order to demonstrate optimistic locking. The class begins with import statements and gets the connection as scott in the main() method: /* This program demonstrates optimistic locking using ora_rowscn (10g only) * COMPATIBLITY NOTE: tested against 10.1.0.2.0.*/ import java.sql.SQLException; import java.sql.Connection; import java.sql.CallableStatement; import oracle.jdbc.OracleTypes; import book.util.JDBCUtil; import book.util.InputUtil; class DemoOptLockingUsingShadowColumn { public static void main(String args[]) throws Exception { Connection conn = null; try { conn = JDBCUtil.getConnection( "scott", "tiger", "ora10g" ); At this point, the user is supposed to have indicated that he wants to update Martin s salary. To simulate that we set the variable empNo to Martin s employee number. int empNo = 7654; Next, we invoke the _displayEmpDetails() method to display Martin s details on the screen that allows the user to modify the details (the ename and sal column values in our example). The method will also return the existing row_change_indicator column value. long rowChangeIndicator = _displayEmpDetails( conn, empNo ); We then pause using our InputUtil.waitTillUserHitsEnter() method (explained in 1) as before: InputUtil.waitTillUserHitsEnter("Row has been selected but is not locked."); At the end of the main() method, we invoke the _updateEmpInfo method with the employee number, the new salary, the new name, and the value of the row_change_indicator column we calculated earlier. This method simply invokes opt_lock_shadowcol_demo. update_emp_info to perform the update. We close the statement in the finally clause as usual: _updateEmpInfo( conn, empNo, 1450, "MARTIN", rowChangeIndicator ); }

finally { JDBCUtil.close ( conn ); } }// end of main The following definition of the methods _displayEmpDetails() and _updateEmpInfo() should be fairly self-explanatory. The method _displayEmpDetails() invokes the PL/SQL package method opt_shadowcol_demo.get_emp_details() to display the employee details of a given employee: private static long _displayEmpDetails( Connection conn, int empNo ) throws SQLException { CallableStatement cstmt = null; long rowChangeIndicator = 0; int salary = 0; String empName = null; try { cstmt = conn.prepareCall( "{call opt_lock_shadowcol_demo.get_emp_details( , , , )}" ); cstmt.setInt( 1, empNo ); cstmt.registerOutParameter( 2, OracleTypes.VARCHAR ); cstmt.registerOutParameter( 3, OracleTypes.NUMBER ); cstmt.registerOutParameter( 4, OracleTypes.NUMBER ); cstmt.execute(); empName = cstmt.getString( 2 ); salary = cstmt.getInt( 3 ); rowChangeIndicator = cstmt.getLong( 4 ); System.out.println( "empno: " + empNo + ", name: " + empName + ", salary: " + salary + ", checksum: " + rowChangeIndicator ); } finally { JDBCUtil.close( cstmt ); } return rowChangeIndicator; } The method _updateEmpInfo() invokes the PL/SQL package method opt_shadowcol_ demo.update_emp_info(), passing in the new values along with the row change indicator that we returned by _displayEmpDetails(): private static void _updateEmpInfo( Connection conn, int empNo, int newSalary, String newEmpName, long rowChangeIndicator ) throws SQLException {

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To accomplish this, create a new ASP.NET AJAX-enabled web site. Because the ScriptManager control has already been placed on the page, drop new UpdatePanel, UpdateProgress, and Timer controls onto the page called MarketData.aspx as shown in Figure 6-1.

CallableStatement cstmt = null; try { cstmt = conn.prepareCall( "{call opt_lock_shadowcol_demo.update_emp_info( , , , , )}" ); cstmt.setInt( 1, empNo ); cstmt.setInt( 2, newSalary ); cstmt.setString( 3, newEmpName ); cstmt.setLong( 4, rowChangeIndicator ); cstmt.registerOutParameter( 5, OracleTypes.NUMBER ); cstmt.execute(); int numOfRowsUpdated = cstmt.getInt( 5 ); if( numOfRowsUpdated <= 0 ) { System.out.println( "Sorry. Someone else changed the data that " + "you were trying to update. Please retry." ); } else { System.out.println( "You have successfully updated the employee " + "information." ); } } finally { JDBCUtil.close( cstmt ); } } }// end of program To test the program, we can run it exactly like we ran the program DemoOptLockingBy SavingOldValues in two windows in the section Optimistic Locking by Saving Old Column Values earlier.

Yet another implementation of optimistic locking involves calculating a checksum of the column values being modified. A checksum is a mathematical function that computes a single, unique value for any input. No two different inputs should map to the same output value. You can use the owa_opt_lock package s checksum function for this purpose. The owa_opt_lock package comes installed as part of the Oracle s HTTP server s mod_plsql module. The checksum function is defined as function owa_opt_lock.checksum(p_buff in varchar2) return number;

After that, you just need an HTML table and a few label controls for the user interface. Let s take a look at the actual markup for this page:

function checksum(p_owner in varchar2, p_tname in varchar2, p_rowid in rowid) return number;

It cannot be used for optimistic locking when being invoked by our JDBC program, since it needs to lock the row in order to calculate the checksum.

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