Procedure check constraint
Hi allMy procedure should check, if the constraints are violated, and if they do then the insertion must be rejected.
How can I insert a code to this procedure to verify if the constraints are vilolated?
Procedure:
CREATE PROCEDURE add_new_customer)
IN cust_no customer. CUST_NO % TYPE,
c_name IN client. C_NAME % TYPE,
IN c_city customer. C_CITY % TYPE,
client IN c_telno. C_TELNO % TYPE,
client IN c_faxno. C_FAXNO % TYPE,
client IN cust_code. CUST_CODE % TYPE,
client IN office_no. OFFICE_NO % TYPE)
AS
v_cust_no NUMBER (5);
v_c_name VARCHAR (30): = 'John ';
v_c_city VARCHAR (30): = "London";
v_c_telno VARCHAR (20): = '07812586060';
v_c_faxno varchar (20): = ";
v_cust_code VARCHAR (2): = ';
v_office_no NUMBER (5): = 125;
BEGIN
INSERT INTO customer (cust_no, c_name, c_city, c_telno, c_faxno, cust_code, office_no)
VALUES (CUST_NO_SEQ. NEXTVAL, Upper (v_c_name), Upper (v_c_city), v_c_telno, v_c_faxno, Upper (v_cust_code), v_office_no);
END;
/
Constraints are the following:
Check the cust_code IN('A+','A','B1','B2','C1','C2',null) CUSTOMER_CUST_CODE_CK
Primary_Key CUSTOMER_CUST_NO_PK
Foreign_Key CUSTOMER_OFFICE_NO_FK
SYS_C009827 check the "CUST_NO" IS NOT NULL
SYS_C009828 check the "C_NAME' IS NOT NULL
SYS_C009829 check the "C_CITY' IS NOT NULL
SYS_C009830 check the 'C_TELNO' IS NOT NULL
Thank you very much!!!
Published by: 899335 on December 12, 2011 11:38
Published by: 899335 on December 12, 2011 11:39
>
My code does not work:
It is probably for this reason
e_values EXCEPTION;
It is declared in the executable section, when it should be declared in the declaration section.
This is how the variables.
There are other problems with your procedure. I have listed below as well as additional comments on things
You should and should not do.
-- 1.
-- Use CREATE OR REPLACE - Much easier to work with
CREATE OR REPLACE PROCEDURE add_new_customer (
-- 2.
-- Naming formal parameters exactly like table columns is not a good
-- idea. You can run into hard to detect scope problems.
-- The convention is some prefix, like P_ or IN_
in_cust_no IN customer.cust_no%TYPE,
in_c_name IN customer.c_name%TYPE,
in_c_city IN customer.c_city%TYPE,
in_c_telno IN customer.c_telno%TYPE,
in_c_faxno IN customer.c_faxno%TYPE,
in_cust_code IN customer.cust_code%TYPE,
in_office_no IN customer.office_no%TYPE
) AS
-- 3.
-- These variables are exactly the same as input parameters, you don't need them
-- v_cust_no NUMBER (5);
-- v_c_name VARCHAR (30) := 'Marcelo';
-- v_c_city VARCHAR (30) := 'London';
-- v_c_telno VARCHAR (20) := '07812586857';
-- v_c_faxno VARCHAR (20) := '';
-- v_cust_code VARCHAR (2) := '';
-- v_office_no NUMBER (5) := 125;
BEGIN
-- 4.
-- You cannot declare anything here, you are in executable section
-- e_values EXCEPTION;
INSERT INTO customer (cust_no,
c_name,
c_city,
c_telno,
c_faxno,
cust_code,
office_no
)
-- 4.
-- You probably want to use the procedure's input parameters here, otherwise they aren't used.
VALUES (cust_no_seq.NEXTVAL,
UPPER (in_c_name),
UPPER (in_c_city),
in_c_telno,
in_c_faxno,
UPPER (in_cust_code),
in_office_no
);
-- 5.
-- This is dead code, like in never reached. If v_cust_code were null,
-- this would not be reached since the INSERT INTO would have raised an
-- exception.
-- IF v_cust_code = NULL THEN
-- RAISE e_values;
-- END IF;
-- 5.
-- Most often it is a bad idea to COMMIT inside a stored procedure.
-- If you do the procedure will not be useful as part of a bigger transaction.
-- COMMIT;
-- 6.
-- If you do not have anything reasonable to do with exceptions, don't handle it.
-- Printing it out is not exception handling. You gain nothing, compared to letting
-- it be (Called let it propagate).
-- It is perfectly fine to let exceptios propagate, and very common.
-- EXCEPTION
-- WHEN e_values THEN
-- DBMS_OUTPUT.put_line ('Cust Code cannot be empty.');
-- 7.
-- Use End Identifiers. Especially, once you start working with packages, they
-- are very useful to keep track of where things end and what ends.
END add_new_customer;
/
So, if I remove all my comments now, your procedure now looks like:
(I also gave it a slightly different name, because I bet that you will add all guests are 'new')
CREATE OR REPLACE PROCEDURE add_customer (
in_cust_no IN customer.cust_no%TYPE,
in_c_name IN customer.c_name%TYPE,
in_c_city IN customer.c_city%TYPE,
in_c_telno IN customer.c_telno%TYPE,
in_c_faxno IN customer.c_faxno%TYPE,
in_cust_code IN customer.cust_code%TYPE,
in_office_no IN customer.office_no%TYPE
) AS
BEGIN
INSERT INTO customer (cust_no,
c_name,
c_city,
c_telno,
c_faxno,
cust_code,
office_no
)
VALUES (cust_no_seq.NEXTVAL,
UPPER (in_c_name),
UPPER (in_c_city),
in_c_telno,
in_c_faxno,
UPPER (in_cust_code),
in_office_no
);
END add_customer;
/
Nice, isn't it?
Then, you create a PACKAGE, say CUST and place your new procedure inside that, instead
to leave a standalone procedure, which is rarely used.
Best regards
Peter
Tags: Database
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Hi, could someone help me solve a problem with the check constraint.
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