How to create a BEFORE INSERT Trigger - mysql

I'm trying to create a BEFORE INSERT trigger and getting errors that I don't understand.
The MySQL to create the trigger looks like this:
CREATE TRIGGER `GetPolyLinkID` BEFORE INSERT ON `TableA`
FOR EACH ROW
BEGIN
INSERT INTO TableB () VALUES ();
NEW.PolyLinkID = last_insert_id();
END
The error I'm getting is
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'END' at line 1


You forgot SET ... begore NEW.PolyLinkID = last_insert_id();
And
For creating complex trigger , you must use the delimiter keyword .
This is a example from rom https://dev.mysql.com/doc/refman/5.6/en/trigger-syntax.html .
delimiter //
CREATE TRIGGER upd_check BEFORE UPDATE ON account
FOR EACH ROW
BEGIN
IF NEW.amount < 0 THEN
SET NEW.amount = 0;
ELSEIF NEW.amount > 100 THEN
SET NEW.amount = 100;
END IF;
END;
//
delimiter ;
Screen shot with sequel pro

Related

sql syntax error creating trigger

I want to create trigger and I have written this query but this does not execute. Please check my query
CREATE
TRIGGER 'blog_after_insert' AFTER INSERT
ON 'blog'
FOR EACH ROW BEGIN
IF NEW.deleted THEN
SET #changetype = 'DELETE';
ELSE
SET #changetype = 'NEW';
END IF;
INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, #changetype);
I am getting this error
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''blog_after_insert' AFTER INSERT
ON 'blog'
FOR EACH ROW BEGIN
IF NEW.del' at line 2

Please run this query
DELIMITER $$
CREATE
TRIGGER blog_after_insert AFTER INSERT
ON blog
FOR EACH ROW BEGIN
IF NEW.deleted THEN
SET #changetype = "DELETE";
ELSE
SET #changetype = "NEW";
END IF;
INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, #changetype);
END$$
DELIMITER ;

Single quotes (') denote string literals - object names, like triggers and tables should use forward quotes, or no quotes at all:
CREATE
TRIGGER blog_after_insert AFTER INSERT -- here
ON blog -- and here
FOR EACH ROW BEGIN
-- rest of code...

Error SQL syntax in a trigger, MySQL

I receive this message "#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 6" but can not figure out what is wrong.
(position and points are MEDIUMINT, they are not primary key neither unique)
Anyone?
CREATE TRIGGER pointsAssigns
before INSERT ON MyTable
FOR EACH ROW
BEGIN
IF NEW.position>6 THEN
set NEW.points=5;
END IF;
END;

As #Mihai mentioned either add closing END and change the DELIMITER
DELIMITER //
CREATE TRIGGER pointsAssigns
BEFORE INSERT ON MyTable
FOR EACH ROW
BEGIN
IF NEW.position > 6 THEN
SET NEW.points = 5;
END IF;
END //
DELIMITER ;
Here is a SQLFiddle demo
or make it one-line trigger and then you don't need neither BEGIN...END block nor changing the DELIMITER
CREATE TRIGGER pointsAssigns
BEFORE INSERT ON MyTable
FOR EACH ROW
SET NEW.points = IF(NEW.position > 6, 5, NEW.points);
Here is a SQLFiddle demo

mysql error with a trigger

I want to create a trigger which will be executed when a new row is about to be inserted if my condition is satisfied ( latest version = 1 ) all previous row will be updated with latest version = 0
CREATE TRIGGER remiseazero
BEFORE INSERT
ON wp_stattype2_3_activite
FOR EACH ROW
BEGIN
IF NEW.latestversion = 1
THEN
update wp_stattype2_3_activite
set latestversion = 0 where typecas = new.typecas;
END IF;
END;$$
Error:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 9

Put delimiter. And remove ; after END.
DELIMITER $$
CREATE TRIGGER remiseazero
BEFORE INSERT
ON wp_stattype2_3_activite
FOR EACH ROW
BEGIN
IF (NEW.latestversion = 1) THEN
update wp_stattype2_3_activite set latestversion = 0 where typecas = NEW.typecas;
END IF;
END$$
DELIMITER ;

MYSQL Error when creating a trigger

I have the following MySQL trigger query :
CREATE
TRIGGER `after_insert_stock` AFTER INSERT
ON `stock`
FOR EACH ROW BEGIN
IF NEW.deleted THEN
SET #changetype = 'DELETE';
ELSE
SET #changetype = 'NEW';
END IF;
INSERT INTO stock_audit (stock_id, commodity_name,commodity_id,delivery_no,supplier_name,batch_no,expiry_date,units_per_pack,no_of_packs,total_quantity,buying_price,selling_price,remarks,available_quantity,user_id,changetype) VALUES (NEW.stock_id,NEW.commodity_name,NEW.commodity_id,NEW.delivery_no,NEW.supplier_name,NEW.batch_no,NEW.expiry_date,NEW.units_per_pack,NEW.total_quantity,NEW.buying_price,NEW.selling_price,NEW.remarks,NEW.available_quantity,NEW.user_id, #changetype);
END$$
When I run the Query I get the following MySQL error : Error
SQL query:
CREATE TRIGGER `after_insert_stock` AFTER INSERT ON `stock_audit`
FOR EACH
ROW BEGIN
IF NEW.deleted
THEN
SET #changetype = 'DELETE';
MySQL said: Documentation
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 7
Please can some one help solving the problem?

You've missed DELIMITER declaration:
DELIMITER $$
CREATE
TRIGGER `after_insert_stock` AFTER INSERT
ON `stock`
FOR EACH ROW BEGIN
IF NEW.deleted THEN
SET #changetype = 'DELETE';
ELSE
SET #changetype = 'NEW';
END IF;
INSERT INTO stock_audit (stock_id, commodity_name,commodity_id,delivery_no,supplier_name,batch_no,expiry_date,units_per_pack,no_of_packs,total_quantity,buying_price,selling_price,remarks,available_quantity,user_id,changetype) VALUES (NEW.stock_id,NEW.commodity_name,NEW.commodity_id,NEW.delivery_no,NEW.supplier_name,NEW.batch_no,NEW.expiry_date,NEW.units_per_pack,NEW.total_quantity,NEW.buying_price,NEW.selling_price,NEW.remarks,NEW.available_quantity,NEW.user_id, #changetype);
END$$

Try this:
DELIMITER $$
CREATE TRIGGER after_insert_stock AFTER INSERT ON stock FOR EACH ROW BEGIN
DECLARE changetype varchar;
IF NEW.deleted THEN
SET changetype := 'DELETE';
ELSE
SET changetype := 'NEW';
END IF;
INSERT INTO stock_audit (stock_id, commodity_name,commodity_id,delivery_no,supplier_name,batch_no,expiry_date,units_per_pack,no_of_packs,total_quantity,buying_price,selling_price,remarks,available_quantity,user_id,changetype) VALUES (NEW.stock_id,NEW.commodity_name,NEW.commodity_id,NEW.delivery_no,NEW.supplier_name,NEW.batch_no,NEW.expiry_date,NEW.units_per_pack,NEW.total_quantity,NEW.buying_price,NEW.selling_price,NEW.remarks,NEW.available_quantity,NEW.user_id, :changetype);
END$$

Try this simplified query -
CREATE TRIGGER `after_insert_stock`
AFTER INSERT
ON `stock`
FOR EACH ROW
INSERT INTO
stock_audit (stock_id, commodity_name,commodity_id,delivery_no,supplier_name,batch_no,expiry_date,units_per_pack,no_of_packs,total_quantity,buying_price,selling_price,remarks,available_quantity,user_id,changetype)
VALUES
(NEW.stock_id,NEW.commodity_name,NEW.commodity_id,NEW.delivery_no,NEW.supplier_name,NEW.batch_no,NEW.expiry_date,NEW.units_per_pack,NEW.total_quantity,NEW.buying_price,NEW.selling_price,NEW.remarks,NEW.available_quantity,NEW.user_id, IF(NEW.deleted, 'DELETE', 'NEW'));

Perform insert or update on table using trigger

I am trying to fetch some values from php page and perform trigger in mysql database. Which is as below:
DELIMITER $$
DROP TRIGGER /*!50032 IF EXISTS */ `test`.`MysqlTrigger`$$
CREATE
/*!50017 DEFINER = 'root'#'localhost' */
TRIGGER `MysqlTrigger` AFTER INSERT OR UPDATE ON `table2`
FOR EACH ROW BEGIN
IF(NEW .flag=0) THEN
INSERT INTO temp(sent,pcount,ncount) VALUES (NEW.sent,NEW.pcount,NEW.ncount);
ELSE
UPDATE temp SET pcount=NEW.pcount AND ncount=NEW.ncount WHERE id = NEW.id;
END IF;
END;
$$
DELIMITER ;
Which gives error:
error Code : 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'or update ON `table2`
FOR EACH ROW BEGIN
if(NEW .flag=0) then
INSERT INTO' at line 3
I tried to change = with =: but error persist. Any idea whaat the prob?

You can't define a trigger for update and insert at the same time. You have to define 2 triggers:
CREATE TRIGGER `Mysql_insert_Trigger` AFTER INSERT ON `table2` ...
CREATE TRIGGER `Mysql_update_Trigger` AFTER UPDATE ON `table2` ...

I count do it. There was problem in syntax. Here is the correct which perform update insert at same moment in different table and update-inset on same table but with if else:
DELIMITER $$
DROP TRIGGER /*!50032 IF EXISTS */ `test`.`MysqlTrigger2`$$
CREATE
/*!50017 DEFINER = 'root'#'localhost' */
TRIGGER `MysqlTrigger2` AFTER INSERT ON `table2`
FOR EACH ROW BEGIN
IF 'flag'=1 THEN
UPDATE record SET sent=NEW.sent WHERE id=NEW.id;
ELSE
INSERT INTO record VALUES (id,NEW.sent);
INSERT INTO temp VALUES ()
END IF;
END;
$$
DELIMITER ;