Error 1442 Hy000 In Mysql
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Error 2002 Hy000 Mysql
the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation error 2002 hy000 mysql centos Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; error 2006 hy000 mysql it only takes a minute: Sign up MySQL Trigger cannot update table - getting ERROR 1442 up vote 4 down vote favorite 1 I have the following trigger: CREATE TRIGGER sum AFTER INSERT ON news FOR EACH ROW UPDATE news SET NEW.sum = (NEW.int_views + NEW.ext_views)/NEW.pageviews It sums the int_views and ext_views column of a table and divides them by
Error 1215 Hy000 Mysql
the total pageviews. Whenever I try to add a new row to news, I get the following error: ERROR 1442 (HY000) at line 3: Can't update table 'news' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. The trigger seems pretty simple to me. Is there a reason why the trigger fails to run? mysql share|improve this question asked Aug 30 '12 at 19:13 egidra 1,50773171 no where condition? –jcho360 Aug 30 '12 at 19:17 @jcho360, Sorry, I'm not seeing where to include a where condition. I want the trigger to execute on every row after it's inserted. –egidra Aug 30 '12 at 19:19 if that doesn't works let me know to try with the WHERE news_id = NEW.news_id; at the end –jcho360 Aug 30 '12 at 19:30 add a comment| 2 Answers 2 active oldest votes up vote 5 down vote accepted The symptom is, that you are running an UPDATE (for all rows) inside a INSERT trigger - both modify the table, which is
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Can't Update Table In Stored Function/trigger Because It Is Already Used By Statement
availability under free open source license, but for its good storage architecture, MySQL is widely used as back-end database servers providing multi-user access. This relational database management system indeed has a great user base, including both http://stackoverflow.com/questions/12203859/mysql-trigger-cannot-update-table-getting-error-1442 organizations as well as individual entrepreneurs. Some of the high-profile web applications using MySQL include Wikipedia, Google (Not for searches), Twitter, and Facebook. However, there are still some features that is not supported by MySQL and if you try to include such functions in your queries, then the database flashes error messages. One such error message that you may received is as below: “1442 (HY000): Can’t update table ‘Table_Name' in stored function/trigger http://www.mysql-database-recovery.com/fix-error-1442.php because it is already used by statement which invoked this stored function / trigger” Reason behind MySQL Error – 1442 MySQL does not support triggers or functions manipulating a table, which is creating them. In other words, in MySQL you are not allowed to refer a table, while updating it. Example: UPDATE Table_Name WHERE 1 = (SELECT 1 FROM Table_Name) MySQL does not support operations as above. This is the reason, in your query if you are creating a trigger that is updating the same table, which is creating the trigger, MySQL will flash Error – 1442. Example: CREATE TRIGGER T1 AFTER UPDATE ON Table_Name FOR EACH ROW UPDATE Table_Name SET d= 'n' WHERE p=0; Solution for MySQL Error 1442: There is no generalized work-around for the MySQL error. Though all other database applications support modification of tables at the time of updating, in near future you can hope to see such flexibility in MySQL also. However, one possible way to resolve MySQL error 1442 is that you can write the query to create the trigger or stored function before updating the corresponding MySQL table. Example: Update the MySQL table by writing the query as ‘CREATE TRIGGER T1 BEFORE UPDATE ON Table_Name’ instead of ‘CREATE TRIGGER T1 AFTER UPDATE
it is already used by statement which invoked this stored function/trigger. 40 Replies Here is a sample table you can create to test following problem/solution on: CREATE TABLE `t1` (
`a` char(1) default http://crazytoon.com/2008/03/03/mysql-error-1442-hy000-cant-update-table-t1-in-stored-functiontrigger-because-it-is-already-used-by-statement-which-invoked-this-stored-functiontrigger/ NULL,
`b` smallint(6) default NULL
);
insert into t1 values ('y','1'); I have a table t1 which has column a and b, I want column a to be updated to ‘n' when column b = 0. Here is the first version I created: DELIMITER |
CREATE TRIGGER trigger1 AFTER UPDATE ON t1
FOR EACH ROW UPDATE t1 SET a= 'n' WHERE b=0;
|
DELIMITER ; The trigger created successfully but I got this error when I tried to do an update on column b on table t1: mysql> update t1 set b=0;
ERROR 1442 (HY000): Can't update table 't1' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
After searching online for a while and trying different solutions, I finally error 2002 hy000 found a way to update the table which has trigger on it:
drop trigger trigger1;
DELIMITER |
CREATE TRIGGER trigger1 BEFORE UPDATE ON t1
FOR EACH ROW
BEGIN
IF NEW.b=0 THEN
SET NEW.a = 'n';
END IF;
END
|
DELIMITER ; After the new trigger is in, I issued the same update query and "ERROR 1442 (HY000): Can't update table ‘t1' in stored function/trigger because it is already used by statement which invoked this stored function/trigger." didn't show up and it updated the col a value to "n" as it suppose to. mysql> update t1 set b=0;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from t1\G
*************************** 1. row ***************************
a: n
b: 0 Therefore, if you want to create a trigger on the table which will update itself, make sure you use the NEW.column_name to refer to the row after it's updated and don't do the full update statement! However, if you are updating some other table, then you can use the regular update statement: DELIMITER |
CREATE TRIGGER trigger1 AFTER UPDA