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The simple loop construct encloses a set of SQL statements between the keywords LOOP and END LOOP. The EXIT statement ends the loop. You use the simple loop construct when you don t know how many times the loop should execute. The logic inside the LOOP and END LOOP statements decides when the loop is terminated. In the following example, the loop will be executed until a quality grade of 6 is reached: LOOP . . . if quality_grade > 5 . . . EXIT; end if; END LOOP;

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The next sections introduce a step-by-step approach that I recommend for reconfiguring a project for C++/CLI. This approach has several goals as follows: Partial migration and short iterations in this context, iteration is the timeframe from one buildable and testable state of your project to the next. Shorter iterations give you more options to test your project s output. If a test fails, it is likely caused by changes made since the last iteration. This can simplify the error tracking significantly. Minimizing impact on existing code. Minimizing overhead of managed execution.

Another simple loop type is the LOOP . . . EXIT . . . WHEN construct, which controls the duration of the loop with a WHEN statement. A condition is specified for the WHEN statement, and when this condition becomes true, the loop will terminate. Here s a simple example: DECLARE count_num NUMBER(6); BEGIN count_num := 1; LOOP dbms_output.put_line(' This is the current count count_num := count_num + 1; Exit when count_num > 100; END LOOP; END;

'|| count_num);

The WHILE loop specifies that a certain statement be executed while a certain condition is true. Note that the condition is evaluated outside the loop. Each time the statements within the LOOP and END LOOP statements are executed, the condition is evaluated. When the condition no longer holds true, the loop is exited. Here s an example of the WHILE loop: WHILE total <= 25000 LOOP . . . SELECT sal INTO salary FROM emp WHERE . . . total := total + salary; END LOOP;

Both the logical AND (&&) and logical OR (||) sequences are simply shortcut versions of the more verbose syntax presented here.

The FOR loop is used when you want a statement to be executed a certain number of times. The FOR loop emulates the classic do loop that exists in most programming languages. Here s an example of the FOR loop:

BEGIN FOR count_num IN 1..100 LOOP dbms_output.put_line('The current count is : END LOOP; END;

'|| count_num);

To migrate to managed compilation, you should start by modifying properties at the project level. Project-level properties are inherited by all project items (source files); however, for a project item, you can explicitly overwrite inherited settings. The very first setting that you should look at is the choice of the CRT variant. Figure 7-3 shows how you can find and modify this setting.

Records in PL/SQL let you treat related data as a single unit. Records contain fields, with each field standing for a different item. You can use the %ROWTYPE attribute to declare a table s columns as a record, which uses the table as a cursor template, or you can create your own records. Here s a simple example of a record: DECLARE TYPE MeetingTyp IS RECORD ( date_held DATE, location VARCHAR2(20), purpose VARCHAR2(50)); To reference an individual field in a record, you use the dot notation, as shown here: MeetingTyp.location

An Oracle cursor is a handle to an area in memory that holds the result set of a SQL query, enabling you to individually process the rows in the result set. Oracle uses implicit cursors for all DML statements. Explicit cursors are created and used by application coders.

test $debug -eq 1 && { echo some_debug_output echo some_more_debug_output }

Implicit cursors are automatically used by Oracle every time you use a SELECT statement in PL/SQL. You can use implicit cursors in statements that return just one row. If your SQL statement returns more than one row, an error will result. In the following PL/SQL code block, the SELECT statement makes use of an implicit cursor: DECLARE emp_name varchar2(40); salary float; BEGIN SELECT emp_name, salary FROM employees WHERE employee_id=9999; dbms_output.put_line('employee_name : '||emp_name||' salary :'||salary); END; /

Explicit cursors are created by the application developer, and they facilitate operations with a set of rows, which can be processed one by one. You always use explicit cursors when you know your SQL statement will return more than one row. Notice that you have to declare an explicit cursor in the