How Can I Alter All The Columns Of A Table In Mysql In Upper Case

Question

0.00/5 (No votes)

See more:

DELIMITER //

DROP PROCEDURE IF EXISTS uppercasecol //

CREATE PROCEDURE uppercasecol(IN tblname VARCHAR(200))
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE oldname VARCHAR(200);
DECLARE cur CURSOR FOR SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA='ADM01' AND TABLE_NAME=tblname;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN cur;
REPEAT
FETCH cur INTO oldname;
SET @newname = UPPER(oldname);
#IF newname equals to oldname, do nothing;
#select 'a' <> 'A'; -> 0
#select 'a' <> BINARY 'A'; -> 1
SET @isNotSame = @newname <> BINARY oldname;
IF NOT done && @isNotSame THEN
SET @SQL = CONCAT('ALTER TABLE `',tblname,'` CHANGE COLUMN `',oldname,'` @newname');
PREPARE tmpstmt FROM @SQL;
EXECUTE tmpstmt;
DEALLOCATE PREPARE tmpstmt;
END IF;
UNTIL done END REPEAT;
CLOSE cur;
END //
DELIMITER ;
CALL uppercasecol('USER_MODULE');

I am using the above code to convert the column names to upper case but the code is giving error 1604(42000) in CONCAT('ALTER TABLE `',tblname,'` CHANGE COLUMN `',oldname,'` @newname'). Can anyone help me out in this...

thanx in advance

Posted 9-Sep-15 20:10pm

#dev_Preet

Updated 10-Sep-15 22:14pm

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

FrankNight · Answer 1 · 2015-09-11T01:12:00

There was some errors.
this should work.

SQL

BEGIN 
 DECLARE done INT DEFAULT 0; 
 DECLARE oldname VARCHAR(200); 
 DECLARE datatype VARCHAR(200); 
 DECLARE cur CURSOR FOR SELECT COLUMN_NAME, COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS 
 WHERE TABLE_SCHEMA='ADM01' AND TABLE_NAME=tblname;

 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; 
 OPEN cur; 
 
 REPEAT 
   FETCH cur INTO oldname, datatype; 
   SET @newname = UPPER(oldname); 
   SET @isNotSame = @newname <> BINARY oldname; 

   IF NOT done && @isNotSame THEN 

     SET @SQL = CONCAT('ALTER TABLE `', tblname, '` CHANGE COLUMN `', oldname, '` `', @newname, '`', datatype); 
 
     PREPARE tmpstmt FROM @SQL; 
     EXECUTE tmpstmt; 
     DEALLOCATE PREPARE tmpstmt; 

   END IF;

 UNTIL done END REPEAT; 

 CLOSE cur; 

 SELECT 'OK' FROM DUAL;
 
END

The last line

SQL

SELECT 'OK' FROM DUAL

will show you if the procedure will end correctly.

Compare the concat function to find your error.

When you have an error in procedure and you can't debug, try to remove lines of code and re execute it to find the offending line/s, or substitute the variable with constant to see if all works as expected.

To find your error I made the procedure return also the result of concat:

SQL

SELECT
CONCAT('ALTER TABLE `', tblname, '` CHANGE COLUMN `', oldname, '` `', @newname, '`', datatype)
FROM DUAL

So I found, also, that the statement you dynamically execute was incorrect.

F.