everybody!
I have a table with name order and into order have column payment_method, I need find in this columns specific text (Bank transfer) and replace with (bank) after into insert to table value Bank transfer, how I do this via MySQL triggers?
I tried to set trigger with this value
delimiter |
FOR EACH ROW
BEGIN
IF order.payment_method like %Bank transfer% THEN
SET order.payment_method = 'Bank';
END IF;
END
|
delimiter ;
And trigger parametr
Time:AFTER
Event:UPDATE
Please help!
Thanks!
CREATE TRIGGER tr_bi_order
BEFORE INSERT
ON order
FOR EACH ROW
SET NEW.payment_method = CASE WHEN NEW.payment_method LIKE '%Bank transfer%'
THEN 'Bank'
ELSE NEW.payment_method
END;
And the same trigger on BEFORE UPDATE event.
Related
Looking to use a trigger on a MYSQL table when the row is updated, anytime the row is updated. Only setting the id if the id field is null
create trigger before_id_update
BEFORE UPDATE
ON USERS for each row
BEGIN
if id iS NULL THEN
SET id = username
END IF;
END
Currently nothing is happening when the table row is updated
Your code should raise a syntax error, since id and username are undefined variables. If you want to access the values on the updated row, use pseudo-tables NEW or OLD.
You also need a delimiter statement at the beginning of your code, and the set command should be terminated with a semi-colon.
You presumably want:
delimiter //
create trigger before_id_update
before update on users
for each row
begin
if new.id is null then
set new.id = new.username;
end if;
end
//
delimiter ;
Note that this only makes sense if both id and username have the same datatype (which is not obvious from their names).
I have two tables in mysql. One is create_load_test and another isload_test. I am inserting data into create_load_test table via html form. It is get updating.
There are 9 columns in create_load_test and 3 columns in load_test.
I want to update id and load_test column values of 'load_test' table, When a row is inserted in create_load_test table via html form.
How to do this? I know only basics of mysql.
Can you help me to solve this?
create_load_test:
load_test table:
try something like this using trigger.
CREATE TRIGGER `after_update_A` AFTER UPDATE ON `A` FOR EACH ROW
BEGIN
UPDATE TABLE B
SET username = NEW.username
, password = NEW.password
, email = NEW.email
WHERE id = NEW.id;
END $$
I have used like this, now it is working fine.
DELIMITER $$
CREATE TRIGGER triggered_from_createload
BEFORE insert ON create_load_test
FOR EACH ROW
BEGIN
INSERT INTO load_test
SET load_test.id = new.id,
load_test.loadtest = new.loadtest;
END$$
DELIMITER ;
I have a table with 2 columns named "Table1":
(Column 1 named "Col1" with the values: A,B,C,D,E,F)
(Column 2 named "Col2" with the values: 12,15,2,5,200,1).
I would like get all the values from column 2 to change to the value 1 if their value is lower than 100, so that column 2 will eventually look like this:
(Column 2 named "Col2" with the values: 1,1,1,1,200,1).
I tried to create a trigger:
delimiter //
CREATE TRIGGER Table1upd BEFORE UPDATE ON Table1
FOR EACH ROW
BEGIN
IF NEW.Col2<100 THEN
SET NEW.Col2=1;
END IF;
END;//
delimiter ;
When creating the trigger in MySQL workbench it says that the trigger was added but that 0 row(s) affected.
I assume my problem is with the BEFORE UPDATE choice, because the trigger does work when I update a value in the table, but I don't know what to change it to so that the trigger will also initially execute automatically when I create it.
Thank you in advance for any help,
D
The answer is simple: a BEFORE UPDATE trigger only triggers on UPDATE, so you need a second trigger BEFORE INSERT to cover both use cases: update and insert:
delimiter //
CREATE TRIGGER Table1insert BEFORE INSERT ON Table1
FOR EACH ROW
BEGIN
IF NEW.Col2<100 THEN
SET NEW.Col2=1;
END IF;
END;//
delimiter ;
I need to track who changes to a table in mySQL database. Would you please give me an idea how I can determine which of my application users makes changes to a record in a table?
I assume you have a table with 2 columns that their name is colmun1 and column2 You should add modified_by column and also add this trigger:
DELIMITER |
CREATE TRIGGER before_update_sometable
BEFORE UPDATE ON sometable FOR EACH ROW
BEGIN
IF (NEW.column1 <> OLD.column1 or NEW.column2 <> OLD.column2) THEN
NEW.modified_by = user();
END IF;
END;
|
DELIMITER ;
I understand how to fill a field with random values, but I need my field to automatically update with a random value for each new column. For some reason, I'm having trouble figuring out how to do this.
By the way, as it says above, this is for a database in MySQL.
Thanks everyone
You can use a trigger to update a specific colum after insert like this:
DELIMITER |
CREATE TRIGGER randtrigger AFTER INSERT ON your_table
FOR EACH ROW BEGIN
UPDATE your_table SET some_column = rand()
WHERE id = NEW.id;
END;
|
DELIMITER ;