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DBMS_OUTPUT:
The Package DBMS_OUTPUT enables you to display output from the PL/SQL subprograms and blocks, that makes it easier to test and debug them. The procedure put_ line results the information to the buffer in the SGA. You can display the information by calling the procedure get_line or by setting the SERVEROUTPUT ON in the SQL*Plus. For illustration, assume that you create the stored procedure which is as shown below:
CREATE PROCEDURE calc_payroll (payroll OUT NUMBER) AS
CURSOR c1 IS SELECT sal, comm FROM emp;
BEGIN
payroll := 0;
FOR c1rec IN c1 LOOP
c1rec.comm := NVL(c1rec.comm, 0);
payroll := payroll + c1rec.sal + c1rec.comm;
END LOOP;
/* Display debug info. */
DBMS_OUTPUT.PUT_LINE('Value of payroll: ' || TO_CHAR(payroll));
END;
Whenever you issue the commands below, the SQL*Plus display the value assigned by the procedure to the parameter payroll:
SQL> SET SERVEROUTPUT ON
SQL> VARIABLE num NUMBER
SQL> CALL calc_payroll(:num);
Value of payroll: 31225
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