Re: Stored Procedure with NOT PL/SQL

From: Thomas Kyte <tkyte_at_us.oracle.com>
Date: Tue, 24 Nov 1998 15:22:25 GMT
Message-ID: <365dcf18.6955902@192.86.155.100>

A copy of this was sent to Frank Meng <frankmeng_at_usa.net> (if that email address didn't require changing) On Tue, 24 Nov 1998 14:44:03 GMT, you wrote:

> I want to create a stored procedure for
>SELECT * from MYTABLE
>When I use BEGIN & END command, Oracle asked me using INTO.
>I don't want to INTO some table, but only display it on the screen.
>When I don't use BEGIN & END with SQL Plus 8.0, I got the message:
>-------------------------------------
>PLS-00103: Encountered the symbol "SELECT" when expecting one of
>the following:
>begin function package pragma procedure subtype type use ...
>-------------------------------------
>Someone told me I must use a cursor to select only one record each time
>and
>use INTO.
>I can't believe it, because I can do it very easily with Microsoft SQL
>Server.
>Please tell me what is wrong to frankmeng_at_usa.net
>Thanks in advance.
>Frank

With 7.2 on up of the database you have cursor variables. Cursor variables are cursors opened by a pl/sql routine and fetched from by another application or pl/sql routine (in 7.3 pl/sql routines can fetch from cursor variables as well as open them). The cursor variables are opened with the privelegs of the owner of the procedure and behave just like they were completely contained within the pl/sql routine. It uses the inputs to decide what database it will run a query on.

Here is an example:

create or replace package types
as

    type cursorType is ref cursor;
end;
/  

create or replace function sp_ListEmp return types.cursortype as

    l_cursor types.cursorType;
begin

    open l_cursor for select ename, empno from emp order by ename;  

    return l_cursor;
end;
/    

REM SQL*Plus commands to use a cursor variable  

variable c refcursor
exec :c := sp_ListEmp
print c

---

and the Pro*c to use this would look like:

static void process()
{
EXEC SQL BEGIN DECLARE SECTION;
    SQL_CURSOR my_cursor;

    VARCHAR     ename[40];
    int         empno;

EXEC SQL END DECLARE SECTION;       EXEC SQL WHENEVER SQLERROR DO sqlerror_hard();  

    EXEC SQL ALLOCATE :my_cursor;  

    EXEC SQL EXECUTE BEGIN
        :my_cursor := sp_listEmp;
    END; END-EXEC;       for( ;; )
    {

        EXEC SQL WHENEVER NOTFOUND DO break;
        EXEC SQL FETCH :my_cursor INTO :ename, empno;
 
        printf( "'%.*s', %d\n", ename.len, ename.arr, empno );

    }
    EXEC SQL CLOSE :my_cursor;
}  

Thomas Kyte
tkyte_at_us.oracle.com
Oracle Government
Herndon VA

--
http://govt.us.oracle.com/ -- downloadable utilities  

---

Opinions are mine and do not necessarily reflect those of Oracle Corporation  

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