How do I CONCAT() a string with itself using a curser in mysql

Question

0.00/5 (No votes)

See more:

my table is like this: SPJ table(snumber, pnumber, jnumber, qty)

my string varchar outputs null when I concat it to itself.

what I want is parenthesized the pairs of ( supplier-number, total-qty-supplied) for all supplier who supply parts.

this is what I have:

SQL

DELIMITER $$
    CREATE DEFINER=`root`@`localhost` PROCEDURE `supplierInfo`(OUT `string` VARCHAR(300))
    BEGIN
    DECLARE s VARCHAR(40);
    DECLARE number VARCHAR(4);
    DECLARE qty  int(6);
    DECLARE FOUND BOOLEAN DEFAULT TRUE;

    DECLARE cur CURSOR FOR
    SELECT DISTINCT spj.snumber, SUM(spj.qty)
    FROM spj
    GROUP BY spj.snumber;
    DECLARE CONTINUE HANDLER FOR NOT FOUND
    SET FOUND = false;
    OPEN cur; 
    FETCH cur INTO number, qty;
    WHILE(FOUND)DO
    SET string = CONCAT(string,'(',number,' ',qty,')');
    FETCH cur INTO number, qty;
    END WHILE;
    CLOSE cur;
    END$$
    DELIMITER ;

What I have tried:

SET string = CONCAT(string,'(',number,' ',qty,')');

SQL

Posted 4-Dec-17 18:07pm

Member 13558298

Updated 4-Dec-17 18:35pm

Add a Solution

Comments

Santosh kumar Pithani 5-Dec-17 0:28am

why 'String' is used in concat? Use "set string=(select concat('(',number,',',qty,')') );"

2 solutions

Solution 2

DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `supplierInfo`()
BEGIN
DECLARE number VARCHAR(4);
DECLARE qty  int(6);
DECLARE FOUND BOOLEAN DEFAULT TRUE;

DECLARE cur CURSOR FOR
SELECT DISTINCT spj.snumber, SUM(spj.qty)
FROM spj
GROUP BY spj.snumber;

DECLARE CONTINUE HANDLER FOR NOT FOUND
SET FOUND = false;

OPEN cur; 
FETCH cur INTO number, qty;

WHILE(FOUND)DO
SELECT CONCAT('(Supplier = ',number,', total Part qty = ',qty,')') AS snumber_And_total_Qty;
FETCH cur INTO number, qty;
END WHILE;

CLOSE cur;
END$$
DELIMITER ;

Posted 4-Dec-17 18:35pm

Member 13558298

Comments

Santosh kumar Pithani 5-Dec-17 1:08am

Good!

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)

Santosh kumar Pithani · Accepted Answer · 2017-12-04T18:30:00

Solution 1

SELECT CONCAT('stringName','(number',',qty)') as Name;

output
------
Name
----
stringName(number,qty)

Posted 4-Dec-17 18:30pm

Santosh kumar Pithani

Comments

Member 13558298 5-Dec-17 0:37am

thanks you are a life saver it worked like a charm!

Santosh kumar Pithani 5-Dec-17 0:48am

Welcome !