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You may have noticed that regardless of whether you use SQLData or ORAData, the code generated by JPublisher suffers from what many would justifiably consider a serious drawback. The problem is that the custom classes (which are domain objects that is, objects that represent end-user business entities such as an Address, a Person, and so on) are tightly coupled with the persistence mechanism. For example, the getAddress() method in the generated domain class MyAddressAuto executes the method get_address() to retrieve the data from the database. Even if database independence is not a goal of your design, it is a good coding practice to separate out the persistence mechanism that you use to save and retrieve your domain objects from the domain objects themselves. This is a fairly involved topic in its own right, and it s beyond the scope of this book. Many well-documented frameworks (such as the Spring framework) are available, using which this objective can be achieved.

Although SQL is easy to learn and has a lot of powerful features, it doesn t allow the procedural constructs of third-generation languages such as C. PL/SQL is Oracle s proprietary extension to SQL, and it provides you the functionality of a serious programming language. One of the big advantages of using PL/SQL is that you can use program units called procedures or packages in the database, thus increasing code reuse and performance.

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A PL/SQL block is an executable program. A PL/SQL code block, whether encapsulated in a program unit such as a procedure or specified as a free-form anonymous block, consists of the following structures, with a total of four key statements, only two of which are mandatory: DECLARE: In this optional section, you declare the program variables and cursors. BEGIN: This mandatory statement indicates that SQL and PL/SQL statements will follow it. EXCEPTION: This optional statement specifies error handling. END: This mandatory statement indicates the end of the PL/SQL code block. Here s an example of a simple PL/SQL code block: SQL> DECLARE isbn NUMBER(9) BEGIN isbn := 123456789; insert into book values (isbn, 'databases', 59.99); COMMIT; END; SQL>

You can declare both variables and constants in the DECLARE section. Before you can use any variable, you must first declare it. A PL/SQL variable can be a built-in type such as DATE, NUMBER, VARCHAR2, or CHAR, or it can be a composite type such as VARRAY. In addition, PL/SQL uses the BINARY_INTEGER and BOOLEAN data types.

Summary

Here are some common PL/SQL variable declarations: hired_date emp_name DATE; VARCHAR2(30);

In addition to declaring variables, you can also declare constants, as shown in the following example: tax_rate constant number := 0.08;

In this chapter, you learned what strongly typed interfaces are. You examined the JDBC standard interface, SQLData, and the Oracle extension interfaces, ORAData and ORADataFactory. You learned about the various options provided by JPublisher, a utility that generates custom classes mapping SQL objects to Java for you. You also learned, through examples, how to use JPublisher to generate custom classes that implement either SQLData or ORAData interfaces that allow you to retrieve and manipulate objects stored in the database. In the next chapter, we will examine how to use collections and references in a JDBC program.

You can also use the %TYPE attribute to declare a variable that is of the same type as a specified table s column, as shown here: emp_num employee.emp_id%TYPE;

The %ROWTYPE attribute specifies that the record (row) is of the same data type as a database table. In the following example, the DeptRecord record has all the columns contained in the department table, with identical data types and length: declare v_DeptRecord department%ROWTYPE;

After the BEGIN statement, you can enter all your SQL statements. These look just like your regular SQL statements, but notice the difference in how you handle a SELECT statement and an INSERT statement in the following sections.

n s 9 and 10, we discussed how to query and modify Oracle objects in JDBC either as weakly typed Struct (or its Oracle implementation STRUCT) objects or as strongly typed custom classes generated by JPublisher In this chapter, we will continue the discussion for Oracle collections and references I provided a brief introduction to Oracle collections in the section Collections (Nested Tables and Varrays) of 8 of this book As far as references go, I will give a brief introduction to them in this chapter, along with how to access them using JDBC Very briefly, references are pointers to already existing rows in an object table For more detailed background information, I encourage you to consult Oracle Database Application Developer s Guide Object Relational Features (10g Release 1).

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