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In this chapter, you learned about the problem known as lost updates. You looked at various techniques you can use to solve this problem. Changing the transaction isolation level to SERIALIZABLE can solve the problem in some special cases. The technique of locking the row beforehand (pessimistic locking) solves the problem for cases where you maintain state across pages. Optimistic locking solves the problem by detecting the changes made by another transaction and asking the user to retry his transaction if unsuccessful. In most of the web applications that use connection pooling, optimistic locking is the only real alternative since it does not require the application to maintain connections across pages. You examined several implementations of optimistic locking, and finally briefly compared optimistic and pessimistic locking.

Sys.Application.add_init(function() { $create(Sys.UI._UpdateProgress, {"associatedUpdatePanelId":null,"displayAfter" :500,"dynamicLayout":true}, null, null, $get("UpdateProgress1")); }); Sys.Application.add_init(function() { $create(Sys.UI._Timer, {"enabled":true,"interval":2000,"uniqueID":"Timer1"}, null, null, $get("Timer1")); }); // --> </script> </form> </body> </html>

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n this chapter, we will look at why it is critical for a JDBC programmer working with Oracle databases to learn and master PL/SQL. We will also examine a few PL/SQL techniques that will help you in writing high-performance and more maintainable PL/SQL code. This chapter is by no means comprehensive in terms of explaining how to exploit PL/SQL fully. For a thorough introduction to PL/SQL, I recommend that you read the excellent Oracle documentation in Oracle PL/SQL User s Guide and Reference. For the built-in PL/SQL packages, you can refer to the Oracle documentation in PL/SQL Packages and Types Reference. I also highly recommend reading the book Mastering Oracle PL/SQL by Connor McDonald (Apress, ISBN: 1-59059-217-4). 9 of Effective Oracle by Design by Tom Kyte (Osborne McGraw-Hill, ISBN: 0-07-223065-7) also gives some very useful PL/SQL techniques.

In 2, we looked at an example of why you need to know PL/SQL. We revisited the topic in the section Where Should Your SQL Statements Reside, in Java or PL/SQL of 6, where you saw ample justification for why you should, in general, encapsulate your databaserelated logic in PL/SQL and use CallableStatement to call the database-related logic from Java (instead of putting your SQL statement strings in your Java code and invoking them using PreparedStatement). This strategy implies that you need to be a good PL/SQL programmer if you want to write effective JDBC programs. Note that the underlying philosophy is true even if you don t use Oracle, in which case you need to be proficient in the equivalent procedural language of your database (most prominent database vendors provide such a procedural language). In this section, we will summarize and expand on our list of reasons to use PL/SQL extensively in code.

The ASP.NET AJAX server controls emit JavaScript functions that copy and build a new innerHTML property of the <span> or <div> tags that contain the value getting updated. They are also responsible for generating a request on XMLHttpRequest and a callback for when the client request is complete. The callback then builds HTML code to put on the innerHTML property of the named <span> or <div> tags. This is basically how the UpdatePanel works under the hood. It uses Sys.WebForms.PageRequestManager to set up an asynchronous callback. These scripts are all automatically generated by the ScriptManager. Near the end of the source in the last lines of script in the page, you can also see the parameters of the Timer control being passed via JavaScript with the interval set to two seconds and the ID of the control being Timer1. Delving deeper into the generated script details piece by piece would fast take us beyond the scope of this chapter. If you are interested in having a more in-depth understanding of the inner workings of these script blocks on the page, you can view them by using either an HTTP sniffer, the JSView plug-in for FireFox (https://addons.mozilla.org/ en-US/firefox/addon/2076), or other third-party tools designed to capture the browser output.

PL/SQL is a part of the database. When you access data from PL/SQL you re already connected to the database you don t need to make separate round-trips for executing multiple SQL statements. PL/SQL and its data structures are also designed up front to be very closely tied with SQL. For example, when you want to declare a variable that stores a value in the column empno of the table emp in the scott schema, you can (and should) declare it as follows: l_empno emp.empno%type;

This ensures that if in the future you change the data type of the empno column to, say, varchar2(30), your PL/SQL code is insulated from such changes. In the same vein, you can intermingle SQL and PL/SQL freely.

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