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Editorial Team
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Asked: 2026-06-17T21:50:03+00:00

I want to pass in the string such as 1,3,5,7,9,0,3 which comes from a

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I want to pass in the string such as “1,3,5,7,9,0,3” which comes from a Java method into a function and for the function to return each value separated by the comma as an Int which will then be used later in a stored procedure (shown below).

CREATE PROCEDURE updateLastModifiedDate(IN p_classId VARCHAR(21844), IN p_timestamp VARCHAR(21844))
    BEGIN
        SET @query = CONCAT ('UPDATE class SET LastModifiedDate = ',p_timestamp,' WHERE ClassId IN (', p_classId ,')');
        PREPARE stmt FROM @query;
        EXECUTE stmt;
        DEALLOCATE PREPARE stmt;
    END //
DELIMITER ;

How would I write the function?

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1 Answer

  1. Editorial Team

    In your case, the input to the function is a COMMA SEPARATED string. But MySql does not include a built-in function to split a COMMA SEPARATED string (comma is just an example for a separator).

    You have mentioned the input as “1,3,5,7,9,0,3”. That means, the count of items is 7. This count Needs to be Constant. I can give you as example but the Count of items should be Constant always.

    Also a mysql function can return a single value only. So you have to call the Procedure from within the function only (after splitting values).

    Am giving you a mysql function with the assumption that, the input string contains 7 items always And the separator used was comma. You have have to modify the function otherwise.

    DELIMITER @@

CREATE FUNCTION getCustomerFullName(commaSeparatedString VARCHAR(256))
RETURNS INT
BEGIN
  DECLARE value1 INT DEFAULT 0;
  DECLARE value2 INT DEFAULT 0;
  DECLARE value3 INT DEFAULT 0;
  DECLARE value4 INT DEFAULT 0;
  DECLARE value5 INT DEFAULT 0;
  DECLARE value6 INT DEFAULT 0;
  DECLARE value7 INT DEFAULT 0;

  IF NOT commaSeparatedString IS NULL
    THEN
          SELECT LENGTH(commaSeparatedString) - LENGTH(REPLACE(commaSeparatedString, ',', '')) INTO @commaCount;

          IF  @commaCount = 0
            THEN
                 RETURN 0;  
          ELSE
            SET value1 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 1),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 0)) + 1), ',', '');
            SET value2 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 2),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 1)) + 1), ',', '');
            SET value3 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 3),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 2)) + 1), ',', '');
            SET value4 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 4),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 3)) + 1), ',', '');
            SET value5 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 5),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 4)) + 1), ',', '');
            SET value6 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 6),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 5)) + 1), ',', '');
            SET value7 = REPLACE(SUBSTRING(SUBSTRING_INDEX(commaSeparatedString, ',', 7),LENGTH(SUBSTRING_INDEX(commaSeparatedString, ',', 6)) + 1), ',', '');

        END IF;
  END IF; 

  CALL updateLastModifiedDate(value1, value2, value3, value4, value5, value6, value7);

  RETURN 1;
END;
@@

DELIMITER ;

    Courtesy:

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