How to call a function in a package

Question

I am doing the following but not working

select package_name.function_name(param,param) from dual

I call a function that returns a cursor, so im guessing "from dual"is the problem

is there any other way to do this?

Answer 1

I assume you mean the Ref cursor. This is a PL / SQL construct that acts as a pointer to the set of records returned by the query. This means that it must be interpreted by the client that is executing the request. For example, we can map the Ref cursor to JDBC or ODBC ResultSet.

There is nothing wrong with your main application. Here is a function similar to yours:

SQL> desc get_emps
FUNCTION get_emps RETURNS REF CURSOR
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 P_DNO                          NUMBER(2)               IN
 P_SORT_COL                     VARCHAR2                IN     DEFAULT
 P_ASC_DESC                     VARCHAR2                IN     DEFAULT

SQL> 

I can easily call this in the wider PL / SQL block:

SQL> declare
  2      rc sys_refcursor;
  3  begin
  4      rc := get_emps(50);
  5  end;
  6  /

PL/SQL procedure successfully completed.

SQL>

SQL * PLus CURSOR :

SQL> select get_emps(50) from dual
  2  /

GET_EMPS(50)
--------------------
CURSOR STATEMENT : 1

CURSOR STATEMENT : 1

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      8060 VERREYNNE  PLUMBER         8061 08-APR-08       4000                    50
      8061 FEUERSTEIN PLUMBER         7839 27-FEB-10       4500                    50
      8085 TRICHLER   PLUMBER         8061 08-APR-10       3500                    50
      8100 PODER      PLUMBER         8061                 3750                    50


SQL>

SQL Developer, .

, , :

• ?
• " "? , , ?
• , ​​ , ..

---

, , User-Defined Ref Cursor ( ). . :

SQL> create or replace package emp_rc_utils as
  2
  3      type emp_rc is ref cursor return emp%rowtype;
  4
  5      function       get_emps
  6          ( p_dno in emp.deptno%type
  7      )
  8      return emp_rc;
  9  end;
 10  /

Package created.

SQL> create or replace package body emp_rc_utils as
  2
  3      function       get_emps
  4          ( p_dno in emp.deptno%type
  5      )
  6          return emp_rc
  7      is
  8          return_value emp_rc_utils.emp_rc;
  9      begin
 10
 11          open return_value for select * from emp where deptno = p_dno;
 12
 13          return return_value;
 14      end get_emps;
 15
 16  end emp_rc_utils;
 17  /

Package body created.

SQL>

...

SQL> declare
  2      rc sys_refcursor;
  3  begin
  4      rc := emp_rc_utils.get_emps(50);
  5  end;
  6  /

PL/SQL procedure successfully completed.


SQL> select emp_rc_utils.get_emps(50) from dual
  2  /

EMP_RC_UTILS.GET_EMP
--------------------
CURSOR STATEMENT : 1

CURSOR STATEMENT : 1

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      8085 TRICHLER   PLUMBER         8061 08-APR-10       3500                    50
      8060 VERREYNNE  PLUMBER         8061 08-APR-08       4000                    50
      8061 FEUERSTEIN PLUMBER         7839 27-FEB-10       4500                    50
      8100 PODER      PLUMBER         8061                 3750                    50


SQL>

Answer 2

refcursor :

create or replace
function getRef return sys_refcursor
is
l_ref  sys_refcursor;
begin

    open l_ref for
    select 1 a, 'a' c from dual
    union all
    select 2 a, 'b' c from dual
    union all
    select 3 a, 'c' c from dual
    union all
    select 4 a, 'd' c from dual;

    return l_ref;

end getRef;
/

select getref() from dual;

GETREF() 
-------- 
A                      C  
---------------------- -  
1                      a  
2                      b  
3                      c  
4                      d  

--you'll notice this isn't the most user-friendly result set if you look at it in SQL Developer or whatno
--drop function getRef;

"",

create or replace type lookup_row as 
  object ( a number, c varchar2(20) );
  /
create or replace type lookups_tab as 
  table of lookup_row;
/

create or replace
function getUserDefinedTableType return lookups_tab
is
lTestTypeTable  lookups_tab;
begin

     SELECT lookup_row(a,c)
               bulk collect INTO lTestTypeTable
               from
    (select 1 a, 'a' c from dual
    union all
    select 2 a, 'b' c from dual
    union all
    select 3 a, 'c' c from dual
    union all
    select 4 a, 'd' c from dual);

    return lTestTypeTable;

end getUserDefinedTableType;
/


select * from table(getUserDefinedTableType());
--this returns it in a more user friendly manner
--http://www.oreillynet.com/pub/a/network/2003/01/22/feuerstein.html?page=2
--http://stackoverflow.com/questions/3150137/converting-oracle-query-into-user-defined-types-in-pl-sql/3152885#3152885
A                      C                    
---------------------- -------------------- 
1                      a                    
2                      b                    
3                      c                    
4                      d  

Answer 3

You tried:

myCursor := package_name.function_name(param,param);

this must be from inside the test block or stored procedure.