Solved

using ALTER TABLE in ORACLE 9i to RENAME NOT NULL CONSTRAINTS IN A LOOP

Posted on 2004-08-12
2
7,271 Views
Last Modified: 2012-06-21
I am getting an error message in the following SQL at the two lines where I invoke ALTER.  What I need to do is rename all NOT NULL constraints in my database to a more meaningful name.  Can someone help me with this?  I need to get this done quick!

DROP TABLE TEMP_CONSTRAINT_RENAMER;
CREATE TABLE TEMP_CONSTRAINT_RENAMER (
aTABLE_NAME VARCHAR2(32),
aCOLUMN_NAME VARCHAR2(32),
aOLD_CONSTRAINT_NAME VARCHAR2(32),
aNEW_CONSTRAINT_NAME VARCHAR2(32)
);

INSERT INTO TEMP_CONSTRAINT_RENAMER (aTABLE_NAME,aCOLUMN_NAME,aOLD_CONSTRAINT_NAME,aNEW_CONSTRAINT_NAME)
SELECT TABLE_NAME, COLUMN_NAME, CONSTRAINT_NAME, 'NN_' || substr(TABLE_NAME,6,12) || '_' || substr(COLUMN_NAME,1,12) || '_' ||  ROWNUM AS NEW_CONSTRAINT_NAME
FROM USER_CONS_COLUMNS
WHERE CONSTRAINT_NAME LIKE 'SYS%';

CREATE OR REPLACE PROCEDURE TEMP_MAKE_NN_NAMES IS

CURSOR C1 IS SELECT ATABLE_NAME,ACOLUMN_NAME,AOLD_CONSTRAINT_NAME,ANEW_CONSTRAINT_NAME FROM TEMP_CONSTRAINT_RENAMER;

myTABLE_NAME VARCHAR(32);
myCOLUMN_NAME VARCHAR(32);
myOLD_CONSTRAINT_NAME VARCHAR(32);
myNEW_CONSTRAINT_NAME VARCHAR(32);

BEGIN
  FETCH C1 INTO myTABLE_NAME, myCOLUMN_NAME, myOLD_CONSTRAINT_NAME, myNEW_CONSTRAINT_NAME;
  WHILE C1%FOUND LOOP
    /* THE FOLLOWING TWO LINES OF CODE WILL NOT COMPILE!  HELP!
     ALTER TABLE myTABLE_NAME DROP CONSTRAINT myOLD_CONSTRAINT_NAME;
     ALTER TABLE myTABLE_NAME MODIFY myCOLUMN_NAME CONSTRAINT myNEW_CONSTRAINT_NAME NOT NULL;
     FETCH C1 INTO myTABLE_NAME, myCOLUMN_NAME, myOLD_CONSTRAINT_NAME, myNEW_CONSTRAINT_NAME;
  END LOOP;
  CLOSE C1;
END TEMP_MAKE_NN_NAMES;

/* EXEC TEMP_MAKE_NN_NAMES;
0
Comment
Question by:rdytmire
2 Comments
 
LVL 5

Accepted Solution

by:
mudumbe earned 500 total points
ID: 11785442
There are 2 problems:

1.  You need OPEN c1 stmt before the first fetch.
2.  In order to your ALTER TABLE, the easiest way is to use EXECUTE IMMEDIATE.  PL/SQL does not support the way you have constructed ALTER TABLE

     execute immediate 'ALTER TABLE ' || myTABLE_NAME || ' DROP CONSTRAINT ' ||
     myOLD_CONSTRAINT_NAME;
     execute immediate 'ALTER TABLE '  ||myTABLE_NAME || ' MODIFY ' ||
     myCOLUMN_NAME || '  CONSTRAINT ' || myNEW_CONSTRAINT_NAME || ' NOT NULL';

NOTE the extra spaces around the quoted string (keywords) to avoid runtime sql syntax errors.
0
 
LVL 1

Author Comment

by:rdytmire
ID: 11785610
Thanks.. this solved the problem.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article describes some very basic things about SQL Server filegroups.
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
Video by: Steve
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now