ou dbms notes for bsc final year pdf download

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[jaseela123d]

The DBMS_OUTPUT is a built-in package that enables you to display output, display debugging information, and send messages from PL/SQL blocks, subprograms, packages, and triggers. We have already used this package all throughout our tutorial.

Let us look at a small code snippet that would display all the user tables in the database. Try it in your database to list down all the table names:

BEGIN
dbms_output.put_line (user || ' Tables in the database:');
FOR t IN (SELECT table_name FROM user_tables)
LOOP
dbms_output.put_line(t.table_name);
END LOOP;
END;
/
DBMS_OUTPUT Subprograms
The DBMS_OUTPUT package has the following subprograms:

S.N Subprogram & Purpose
1 DBMS_OUTPUT.DISABLE;
Disables message output

2 DBMS_OUTPUT.ENABLE(buffer_size IN INTEGER DEFAULT 20000);
Enables message output. A NULL value of buffer_size represents unlimited buffer size.

3 DBMS_OUTPUT.GET_LINE (line OUT VARCHAR2, status OUT INTEGER);
Retrieves a single line of buffered information.

4 DBMS_OUTPUT.GET_LINES (lines OUT CHARARR, numlines IN OUT INTEGER);
Retrieves an array of lines from the buffer.

5 DBMS_OUTPUT.NEW_LINE;
Puts an end-of-line marker

6 DBMS_OUTPUT.PUT(item IN VARCHAR2);
Places a partial line in the buffer.

7 DBMS_OUTPUT.PUT_LINE(item IN VARCHAR2);
Places a line in the buffer.

Example:
DECLARE
lines dbms_output.chararr;
num_lines number;
BEGIN
-- enable the buffer with default size 20000
dbms_output.enable;

dbms_output.put_line('Hello Reader!');
dbms_output.put_line('Hope you have enjoyed the tutorials!');
dbms_output.put_line('Have a great time exploring pl/sql!');

num_lines := 3;

dbms_output.get_lines(lines, num_lines);

FOR i IN 1..num_lines LOOP
dbms_output.put_line(lines(i));
END LOOP;
END;
/
When the above code is executed at SQL prompt, it produces the following result:

Hello Reader!
Hope you have enjoyed the tutorials!
Have a great time exploring pl/sql!

PL/SQL procedure successfully completed.