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To update a value in the varray column, you have to replace the entire varray with a new varray value you cannot selectively replace or add an element. Thus for a simple update, you will have to use procedural code. This is a huge limitation that should more or less convince you that using varrays in tables is not a good idea in general. Not only does the code complexity increase, but also the performance of an update decreases since you are now forced to use procedural code instead of SQL. As an example of a procedural update, see the following code for the procedure add_email_address. The procedure adds a new a e-mail address to a given department number in the dep_email_addresses table: benchmark@ORA10G> create or replace procedure add_email_address( 2 p_dep_no in number, p_email_address in varchar2) 3 is 4 l_prev_email_addresses dep_email_addresses.email_addresses%type; 5 begin 6 First, we select the old varray column value into a varray variable: 8 9 10 11 12 select c.email_addresses into l_prev_email_addresses from dep_email_addresses c where dep_no = p_dep_no; Next, we extend the varray variable to store the new e-mail address: 14 l_prev_email_addresses.extend(1); We then store the new e-mail address as the last element of the varray variable: 16 17 l_prev_email_addresses( l_prev_email_addresses.count) := p_email_address; Finally, we replace the varray column in the table with the new varray variable value: 20 21 22 23 24 update dep_email_addresses d set d.email_addresses = l_prev_email_addresses where dep_no = p_dep_no; end add_email_address; /

Figure 8-26. Signals based on the JavaBeans naming pattern A and B exchange only one signal, called actionPerformed. Since the notification is delivered by a call through the ActionListener interface, you can infer that the signal is related to the Action event, and that a payload object of type ActionEvent is passed in the notification to B. In the source code for A, the actionPerformed notification might be sent by a Fire method named FireAction. The problem with the JavaBeans event naming convention is that it ties event names to internal plumbing details, such as interface and method names. When used on a wiring diagram, these names often don t provide enough information about what event was detected and what the event notification is telling the subscriber. In the previous diagram, you could use an Action event to notify object B of almost anything. The diagram provides no clues that might help you understand why the connection is made between A and B, and what the signal does. The situation is akin to an electrical diagram labeling a wire only by its color or its gauge, neither of which help understand what the wire is for.

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Transactions form the basis of any database. In this chapter, you ll take a brief look at transactions in the context of JDBC. You ll see how to commit and roll back a transaction in JDBC. You ll learn what transaction isolation levels are and which ones are supported by Oracle. You ll learn about some important principles you need to follow when writing transactions for an Oracle application. You ll also examine transaction savepoints, a feature exposed to Java programs in JDBC 3.0.

Events fired using procedure calls use a reference to the subscriber. Before firing a PC event, the sender must always check to see if the subscriber reference points to something; otherwise, a runtime error will occur. Since PC events are fired as indirect procedure calls, the subscriber reference will contain a reference either to a typed object or to a method. In both cases, the reference is usually initialized to zero or null, indicating no subscribers. When an object subscribes, a reference to it is saved in the event source. Firing events using procedure calls is conceptually similar across most languages, but each language imposes its own details at the implementation level.

Someone accidentally deleted the worksheet that contained the source data for your pivot table, and you would like to re-create it. (Yes, you know you should have kept a backup copy!) This problem is based on the SourceData.xlsx workbook.

In this chapter, you ll first be introduced to the mechanics of how Oracle processes SQL statements. You ll then examine two of the fundamental statement interfaces of JDBC: Statement and PreparedStatement. You ll look at why you should almost always prefer PreparedStatement over Statement. You ll learn about how using PreparedStatement can help avoid SQL injection (a security hacking technique) attacks. You ll also learn about standard and Oracle update batching, and compare the two in terms of performance and other features.

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