Trigger to insert data based on a value - mysql

Question

We have 3 tables:
punches-table :
ID user_code (columns )
2 10
Employees_table :
Id user_code(columns )
5 10
I want a trigger that once a new record is inserted to punches_table will search for the same user_code in employees table and than insert the 2 id values into:
Punches-employees-relation_table:
ID employees_id punches_id
1 2 5
Update
Thanks for the answer, I am getting 1064 error, I guess I have MariaDB and the code is not good for MariaDB.
Here is what I am trying to do: First I would like to say that at the first time I did not put the exact tables and fields names.
So to put thing in order: The first table name is a123_employees_punches
Fields:
id (char(36))
user_code (int(255))
The 2nd table is abc12_employees_cstm
Fields:
id_c (char(36))
usercode_c (varchar(255))
The 3rd table is abc12_employees_a123_employees_punches_1_c
fields:
abc12_employees_a123_employees_punches_1abc12_employees_ida (varchar(36))
abc12_empl4863punches_idb (varchar(36))
Environment:
Server: Localhost via UNIX socket
Server type: MariaDB
Server version: 5.5.64-MariaDB - MariaDB Server
Protocol version: 10
User: root#localhost
Server charset: UTF-8 Unicode (utf8)
The goal is to have a trigger that once a new record is inserted into a123_employees_punches table to obtain the matching id_c from abc12_employees_cstm table based on the new user_code inserted and matching usercode_c.
And then will insert into 2 fields in the abc12_employees_a123_employees_punches_1_c table (abc12_employees_a123_employees_punches_1abc12_employees_ida (varchar(36)) and abc12_empl4863punches_idb (varchar(36))
I tried this so far:
CREATE TRIGGER relate_punch_to_employee AFTER INSERT on a123_employees_punches
FOR EACH ROW
BEGIN
SELECT id_c INTO #id FROM a123_employees_punches_cstm WHERE usercode_c = NEW. user_code ;
INSERT into abc12_employees_a123_employees_punches_1_c (abc12_employees_a123_employees_punches_1abc12_employees_ida, abc12_empl4863punches_idb) VALUES (#id, NEW.id);
END$$
but it gives me the following error:
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 4

Answer 1

Your tables and fields don't look correct and you didn't provide the create table, so you must check the tables and statements below if they work
DELIMITER $$
CREATE TRIGGER after_punches_table_insert
AFTER INSERT
ON punches_table
FOR EACH ROW
BEGIN
SELECT Id INTO #id
FROM Employees_table
WhERE user_code = NEW. user_code ;
INSERT INTO Punches_employees_relation_table (employees_id, punches_id)
VALUES(NEW.ID,#id);
END$$
DELIMITER ;
select version();
| version() |
| :-------------------------------------- |
| 10.3.16-MariaDB-1:10.3.16+maria~stretch |
CREATE TABLE Punches_employees_relation_table (
`employees_id` INTEGER,
`punches_id` INTEGER
);
✓
CREATE TABLE Employees_table (
`Id` INTEGER,
`user_code` INTEGER
);
✓
INsERT INTO Employees_table (
`Id` ,
`user_code`
) VALUES (1,100);
✓
SELECT * FROM Employees_table;
Id | user_code
-: | --------:
1 | 100
CREATE TABLE punches_table (
`ID` INTEGER,
`user_code` INTEGER
);
✓
CREATE TRIGGER after_punches_table_insert
AFTER INSERT
ON punches_table
FOR EACH ROW
BEGIN
SET #id2 = NEW.user_code;
SELECT Id INTO #id
FROM Employees_table
WhERE user_code = NEW.user_code ;
INSERT INTO Punches_employees_relation_table (employees_id, punches_id)
VALUES(#id,NEW.ID);
END;
✓
InsERT punches_table (ID,user_code) VALUES (3,100);
✓
SELECT * FROM Punches_employees_relation_table;
employees_id | punches_id
-----------: | ---------:
1 | 3
db<>fiddle here