In this part, we will examine the DBMS Output in PL/SQL. The DBMS_OUTPUT is an implicit bundle that empowers you to show yield, troubleshooting data, and send messages from PL/SQL blocks, subprograms, bundles, and triggers. We have just utilized this bundle all through our instructional exercise.
Allow us to take a gander at a little code scrap that will show all the client tables in the data set. Attempt it in your information base 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 bundle has the accompanying subprograms −
S.No | 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;
/
At the point when the above code is executed at the SQL brief, it delivers the accompanying outcome −
Hello Reader!
Hope you have enjoyed the tutorials!
Have a great time exploring pl/sql!
PL/SQL procedure successfully completed.