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Mysql trigger to update if date match and insert if no match all BEFORE INSERT

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2 answers
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please pardon my English i am using language translator.
I have a table summary ,i want a TRIGGER to fire before insert on this table i.e summary and what i want is that, the TRIGGER should check if the incoming date matches with existing date, it should update the table and add incoming value to existing value else it should just insert
summary
+------+-------+-------------+------+
| date |income | expenditure | other|
|22/17 | 200   |   50        |  30  |
|22/17 | 100   |   10        |  80  |
|23/17 | 50    |   100       |  0   |
+------+-------+-------------+------+

summary // this is how i want it to be
+------+-------+-------------+------+
| date |income | expenditure | other|
|22/17 | 300   |   150       |  30  |
|23/17 | 50    |   100       |  0   |
+------+-------+-------------+------+
my table code
CREATE TABLE summary (
  id_ int(11) NOT NULL,
  date_ date NOT NULL,
  income_ text NOT NULL,
  expenditure_ text NOT NULL,
  other_ text NOT NULL,
  PRIMARY KEY(id) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO summary 
(id_, date_, income_, expenditure_, other_)
VALUES
(1, '2017-12-22', 200, 50, 30),
(2, '2017-12-22', 100, 10, 80),
(3, '2017-12-23', 50, 100, 0);
This is what i have been trying so far, though am a Novist
trigger code
DELIMITER
$$
CREATE TRIGGER inc_trig 
BEFORE INSERT 
ON income_
FOR EaCH ROW
BEGIN
DECLARE income,expenditure,other INT;

SET income=1; SET expenditure=2; SET other=3;

IF( NEW.date_ != date_ )THEN

IF NEW.name_ = income THEN
INSERT INTO summary (date_,income)
VALUES (new.date_,new.amount);

ELSEIF NEW.name_ = expenditure THEN
INSERT INTO summary (date_,expenditure_)
VALUES (new.date_,new.amount);

ELSEIF NEW.name_ = other THEN
INSERT INTO summary (date_,other_)
VALUES (new.date_,new.amount);


ELSE(new.date_ = date_)THEN

IF NEW.name_ = income_ THEN
UPDATE summary SET income_ = income_ + new.amount);

ELSEIF NEW.name_ = expenditure THEN
UPDATE summary SET expenditure_ = expenditure_ + new.amount);

ELSEIF NEW.name_ = other THEN
UPDATE summary SET other_ = other_ + new.amount);


END IF;

END
$$

Asked by Joshua Sampson (5 rep)
Dec 10, 2017, 07:33 PM
Last activity: Aug 3, 2025, 01:03 AM