Easy Stored Procedure Output Oracle Select

本文转自：http://www.oraclealchemist.com/oracle/easy-stored-procedure-output/

I answered a question on a DBA Forum today and I thought it was a common enough question to warrant a blog posting.

Question:  I am new to the wonderful world of Oracle. I want to be able to view the results of a stored procedure in an output window, say out of Oracle SQL developer. Unfortunately it appears I need to write some more code to actually view the data.

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On a more generic note, can anyone explain to me why Oracle has chosen to make PL/SQL inordinately more complicated than say MS SQL/Servers tSQL? I mean in tSQL I would just write:

CREATE OR REPLACE PROCEDURE TESTSPROC2 AS select * from test_table order by id_no; GO

and viola, a nice result set spits out in Query Analyzer (or a .net application).

Answer:

Before I go on, let me say I agree that PL/SQL is more powerful.  That being said, here are your options.

1. Test it with REFCURSOR using a FUNCTION and selecting from dual:

 

SQL> create or replace function testfunc return sys_refcursor 2 as 3 c_test sys_refcursor; 4 begin 5 open c_test for select first_name, last_name, email from employees where rownum < 10; 6 return c_test; 7 end; 8 / Function created. SQL> select testfunc() from dual; TESTFUNC() -------------------- CURSOR STATEMENT : 1 CURSOR STATEMENT : 1 FIRST_NAME LAST_NAME EMAIL -------------------- ------------------------- ------------------------- Steven King SKING Neena Kochhar NKOCHHAR Lex De Haan LDEHAAN Alexander Hunold AHUNOLD Bruce Ernst BERNST David Austin DAUSTIN Valli Pataballa VPATABAL Diana Lorentz DLORENTZ Nancy Greenberg NGREENBE 9 rows selected.

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SQL > create or replace function testfunc return sys_refcursor   2   as   3     c_test sys_refcursor ;   4   begin   5     open c_test for select first_name , last_name , email from employees where rownum < 10 ;   6     return c_test ;   7   end ;   8   /   Function created .   SQL > select testfunc ( ) from dual ;   TESTFUNC ( ) -- -- -- -- -- -- -- -- -- -- CURSOR STATEMENT : 1   CURSOR STATEMENT : 1   FIRST_NAME           LAST_NAME                 EMAIL -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- -- -- -- -- -- -- -- -- - Steven               King                      SKING Neena                Kochhar                   NKOCHHAR Lex                  De Haan                   LDEHAAN Alexander            Hunold                    AHUNOLD Bruce                Ernst                     BERNST David                Austin                    DAUSTIN Valli                Pataballa                 VPATABAL Diana                Lorentz                   DLORENTZ Nancy                Greenberg                 NGREENBE   9 rows selected .

 

2. Use the same function and return it into a variable: 

 

SQL> variable rc refcursor SQL> exec :rc := testfunc() PL/SQL procedure successfully completed. SQL> print rc FIRST_NAME LAST_NAME EMAIL -------------------- ------------------------- ------------------------- Steven King SKING Neena Kochhar NKOCHHAR Lex De Haan LDEHAAN Alexander Hunold AHUNOLD Bruce Ernst BERNST David Austin DAUSTIN Valli Pataballa VPATABAL Diana Lorentz DLORENTZ Nancy Greenberg NGREENBE 9 rows selected.

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SQL > variable rc refcursor SQL > exec : rc : = testfunc ( )   PL / SQL procedure successfully completed .   SQL > print rc   FIRST_NAME           LAST_NAME                 EMAIL -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- -- -- -- -- -- -- -- -- - Steven               King                      SKING Neena                Kochhar                   NKOCHHAR Lex                  De Haan                   LDEHAAN Alexander            Hunold                    AHUNOLD Bruce                Ernst                     BERNST David                Austin                    DAUSTIN Valli                Pataballa                 VPATABAL Diana                Lorentz                   DLORENTZ Nancy                Greenberg                 NGREENBE   9 rows selected .

 

3. Use your procedure with a variable:

 

SQL> create or replace procedure testproc(c_test out sys_refcursor) is 2 begin 3 open c_test for select first_name, last_name, email from employees where rownum < 10; 4 end; 5 / Procedure created. SQL> variable rc2 refcursor SQL> exec testproc(:rc2); PL/SQL procedure successfully completed. SQL> print rc2 FIRST_NAME LAST_NAME EMAIL -------------------- ------------------------- ------------------------- Steven King SKING Neena Kochhar NKOCHHAR Lex De Haan LDEHAAN Alexander Hunold AHUNOLD Bruce Ernst BERNST David Austin DAUSTIN Valli Pataballa VPATABAL Diana Lorentz DLORENTZ Nancy Greenberg NGREENBE 9 rows selected.

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SQL > create or replace procedure testproc ( c_test out sys_refcursor ) is   2   begin   3     open c_test for select first_name , last_name , email from employees where rownum < 10 ;   4   end ;   5   /   Procedure created .   SQL > variable rc2 refcursor SQL > exec testproc ( : rc2 ) ;   PL / SQL procedure successfully completed .   SQL > print rc2   FIRST_NAME           LAST_NAME                 EMAIL -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- -- -- -- -- -- -- -- -- - Steven               King                      SKING Neena                Kochhar                   NKOCHHAR Lex                  De Haan                   LDEHAAN Alexander            Hunold                    AHUNOLD Bruce                Ernst                     BERNST David                Austin                    DAUSTIN Valli                Pataballa                 VPATABAL Diana                Lorentz                   DLORENTZ Nancy                Greenberg                 NGREENBE   9 rows selected .

 

#3 is more in-line with your original needs. Personally I’m a fan of #1 and #2 because of the capabilities of returning a refcursor as a function, like passing it into DBMS_XMLGEN.GETXML.