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Before starting to write code that uses managed types and constructs, I recommend further preparation steps. If your project has a precompiled header (typically called stdafx.pch), you will not be able to use that one for files compiled to managed code. A source file can only use a precompiled header that was created with the same compilation model. Since stdafx.pch was created without any of the /clr switches, it can only be used by files compiled to native code. To create a second precompiled header, add a new source file to your project. Name it stdafx_clr.cpp. Add just one line of code to that file: #include "stdafx.h" Set the following properties for stdafx_clr.cpp: C/C++ Precompiled Headers Create/Use precompiled headers: Set this property to Create precompiled header /Yc. C/C++ Precompiled Headers Precompiled header file: Set this property to $(IntDir)\$(TargetName)_clr.pch. C/C++ Precompiled Headers Create/Use PCH Through file: Set this property to stdafx.h. C/C++ General Compile with CLR Support: Set this property to Common Language Runtime Support /clr. C/C++ Code Generation Basic Runtime Checks: Set this property to Default. C/C++ Code Generation Enable Minimal Rebuild: Set this property to No. C/C++ Code Generation Enable C++ Exceptions: Set this property to Yes with SEH exceptions /EHa. Again, make sure you specify these settings for debug, release, and any other configurations that you may have defined. When you expect that the managed code you intend to write needs other types than your native code, you may consider creating a stdafx_clr.h file to build the precompiled header. In this case, you have to modify the C/C++ Precompiled Headers Create/Use PCH Through file property to stdafx_clr.h.

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You can use both PL/SQL and Java to write applications that need Oracle database access. Although PL/SQL has several object-oriented features, the Java language is well known as an object-oriented programming language. If your application needs heavy database access and must process large amounts of data, PL/SQL is probably a better bet. However, for open distributed applications, Javabased applications are more suitable. The Oracle database contains a Java Virtual Machine (JVM) to interpret Java code from within the database. Just as PL/SQL enables you to store code on the server and use it multiple times, you can also create Java stored procedures and store them in the database. These Java stored procedures are in the form of Java classes. You make Java files available to the Oracle JVM by loading them into the Oracle database as schema objects. You can use the Java programming language in several ways in an Oracle database. You can invoke Java methods in classes that are loaded in the database in the form of Java stored procedures. You can also use two different application programming interfaces (APIs), Java Database Connectivity (JDBC) or SQLJ, to access the Oracle database from a Java-based application program. In the sections that follow, we ll briefly look at the various ways you can work with Java and the Oracle database.

Java stored procedures are, of course, written using Java, and they facilitate the implementation of data-intensive business logic using Java. These procedures are stored within the database like

PL/SQL stored procedures. Java stored procedures can be seen as a link between the Java and nonJava environments. You can execute Java stored procedures just as you would PL/SQL stored procedures. Here s a summary of the steps involved in creating a Java stored procedure: 1. Define the Java class. 2. Using the Java compiler, compile the new class. 3. Load the class into the Oracle database. You can do this by using the loadjava commandline utility. 4. Publish the Java stored procedure. Once you ve completed these steps, you can invoke the Java stored procedure.

The following example adds another layer of complexity to the previous example. Not only are there two expressions to evaluate, but the first expression of the two contains two additional expressions of its own. Note that the two main expressions are surrounded by square brackets and are separated by a logical OR (||). The use of the OR indicates that the entire test evaluates as true whenever either one of the two expressions is true. The -a operator inside the first expression is also a logical AND. You can string multiple expressions together with the -a or the logical OR (-o) operator, as you can with the && and || syntax.

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