Mysql dynamic trigger creation in stored procedure

Question

I want to create the dynamic trigger when call the procedure, it give the mysql server version syntax error, when i select that query and execute in separate query editor it will be executed.

DROP TABLE IF EXISTS auditLog;
CREATE TABLE `auditlog` (
  `tableName` VARCHAR(255) DEFAULT NULL,
  `rowPK` INT(11) DEFAULT NULL,
  `fieldName` VARCHAR(255) DEFAULT NULL,
  `old_value` VARCHAR(255) DEFAULT NULL,
  `new_value` VARCHAR(255) DEFAULT NULL,
  `ts` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=ARCHIVE;

CREATE TABLE country(countryname VARCHAR(100);

DROP PROCEDURE IF EXISTS addLogTrigger;
DELIMITER $
/*
call addLogTrigger('country','CountryID','CountryName')

*/
CREATE PROCEDURE addLogTrigger
(IN tableName VARCHAR(255), IN pkField VARCHAR(255),IN column_name VARCHAR(50))
BEGIN


    SET @qry = CONCAT
    (
' 
DROP TRIGGER IF EXISTS  ', tableName, '_AU ; 

CREATE TRIGGER ', tableName, '_AU AFTER UPDATE ON ', tableName, ' 
FOR EACH ROW
              ',' 
                 INSERT INTO auditLog (',
                    'tableName, ',
                    'rowPK, ',
                    'fieldName, ',
                    'old_value, ',
                    'new_value'
                    ') VALUES 
                    ( ''', 
                        tablename, ''', NEW.', 
                        pkField, ', ''', 
                        column_name, ''', OLD.', 
                        column_name, ', NEW.', 
                        column_name, 
                    '); 
                    '
             , '  

             '
        ) ;

        SELECT @qry;
        PREPARE stmt FROM @qry;
            EXECUTE stmt;
         DEALLOCATE PREPARE stmt;

END$
DELIMITER ;

Kedar Acharekar · Accepted Answer · 2012-09-27 05:08:30Z

2

Karthikeyan,

You can not create a trigger inside stored procedure. Trigger is a DDL statement which is not allowed inside procedures.

" ERROR 1303 (2F003): Can't create a TRIGGER from within another stored routine "

To solve your purpose you can do following:

Take current values from table inside variable.
Simply write a update query inside your procedure, then check whether value is updated or not by "ROW_COUNT()".
Compare new value with old value, of changed then manually insert into change_log table.

answered Sep 27, 2012 at 5:08

Kedar Acharekar

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