SQL>
SQL> CREATE OR REPLACE PROCEDURE myProcedure(p1 IN VARCHAR2 := NULL) AS
2 BEGIN
3 DBMS_OUTPUT.PUT_LINE('myProcedure called with ' || p1);
4 END myProcedure;
5 /
Procedure created.
SQL>
SQL>
SQL>
SQL>
SQL> CREATE OR REPLACE PROCEDURE myProcedure2(p1 IN OUT VARCHAR2) AS
2 BEGIN
3 DBMS_OUTPUT.PUT_LINE('myProcedure2 called with ' || p1);
4 p1 := p1 || ' returned!';
5 END myProcedure2;
6 /
Procedure created.
SQL>
SQL>
SQL> CREATE OR REPLACE FUNCTION CallFunc(p1 IN VARCHAR2)
2 RETURN VARCHAR2 AS
3 BEGIN
4 DBMS_OUTPUT.PUT_LINE('CallFunc called with ' || p1);
5 RETURN p1;
6 END CallFunc;
7 /
Function created.
SQL>
SQL>
SQL>
SQL>
SQL> set serveroutput on
SQL>
SQL> -- Some valid calls direct from SQL.
SQL> CALL myProcedure('Hello!');
myProcedure called with Hello!
Call completed.
SQL>
SQL> Call completed.
2
SQL> CALL myProcedure();
myProcedure called with
Call completed.
SQL>
SQL> Call completed.
2
SQL> VARIABLE v_Output VARCHAR2(50);
SQL>
SQL>
SQL> Call completed.
2
SQL> PRINT v_Output
V_OUTPUT
--------------------------------------------------------------------------------
SQL>
SQL> CALL myProcedure2(:v_Output);
myProcedure2 called with
Call completed.
SQL>
SQL> Call completed.
2
SQL> PRINT v_Output
V_OUTPUT
--------------------------------------------------------------------------------
returned!
SQL>
SQL>