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Plsql - DBMS Output

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.

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Plsql - DBMS Output