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// explicit class imports to avoid // name collisions between JAXM and JMS import javax.jms.QueueConnectionFactory; import javax.jms.QueueConnection; import javax.jms.QueueSession; import javax.jms.Session; import javax.jms.QueueSender; import javax.jms.Queue; import javax.jms.TextMessage; import javax.xml.messaging.*; import javax.xml.soap.*; // JAXM based on JDOM import org.jdom.*; import java.io.*; import java.util.*; import javax.servlet.*; public class ImageUpdateServlet extends JAXMServlet { private QueueConnectionFactory qcFactory = null; private Queue queue = null; public void init(ServletConfig servletConfig) throws ServletException { try { Context naming = new InitialContext(); qcFactory = (QueueConnectionFactory) naming.lookup( "mycompany.jms.QueueConnectionFactory"); queue = (Queue) naming.lookup( "mycompany.jms.ProductImageUpdateQueue"); } catch(Exception e) { throw new ServletException(e.getMessage()); } } public SOAPMessage onMessage(SOAPMessage message) { try { // put the JAXM Message on the Queue ByteArrayOutputStream baos = new ByteArrayOutputStream(); message.writeTo(baos); String jaxmMsgString = baos.toString("UTF-8");

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DDL changes need to be handled by the application This might present a significant challenge in some environments Dropping a column (non-primary key) is permitted, but the CHANGETABLE function might still return details about the column if column change tracking is enabled Adding a column is also permitted but column change tracking will ignore the new column Changes to the data type of a column are permitted but are not tracked When change tracking for columns is enabled, a special function, CHANGE_TRACKING_IS_ COLUMN_IN_MASK, is used to determine whether a specific column has been updated Truncating a table does not cause each individual row DELETE to be tracked It does, however, reset the minimum valid version for the table Clients will then detect that they are too far out of sync and need to reload any values from the table .

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Databases must be at database compatibility level 90 or higher for change tracking to be enabled You also can t disable change tracking at the database level until it has been disabled for all tables within the database The syschange_tracked_tables system view can help with locating these tables Because updates to the change tracking tables are done in the context of the transaction that caused the modification, performance is impacted SQL Server Books Online suggests that this impact is similar to having an additional non-clustered index on the table that needs to be updated as modifications occur Security also needs to be considered To access changes for a table, a user needs both SELECT permission on at least the primary key of the table and also VIEW CHANGE TRACKING permission The latter is required to avoid information leakage that could occur if only SELECT permissions were required .

QueueConnection qcon = qcFactory.createQueueConnection(); QueueSession qsession = qcon.createQueueSession(false, Session.AUTO_ACKNOWLEDGE); QueueSender qsender = qsession.createSender(queue); TextMessage msg = qsession.createTextMessage(); qcon.start(); msg.setText(jaxmMsgString); qsender.send(msg); // clean up qsender.close(); qsession.close(); qcon.close();

For example, it might be inappropriate to allow a user to have any knowledge of rows that were deleted from the table before they were given permission to view change details The final significant issue to consider is how to handle a restore of the database Depending upon the time of the latest syncs, clients may or may not be affected In most cases, a re-sync is the appropriate action If you have been following along with the code in this book, you might also wish to clean up the inserted data and disable change tracking with the following code:.

DELETE FROM HR.Employees WHERE empid > 9; DBCC CHECKIDENT('HR.Employees',RESEED,9); ALTER TABLE HR.Employees DISABLE CHANGE_TRACKING; ALTER DATABASE InsideTSQL2008 SET CHANGE_TRACKING = OFF; ALTER DATABASE InsideTSQL2008 SET ALLOW_SNAPSHOT_ISOLATION OFF;

Integrated Services Digital Network (ISDN)

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