DB2 UPDATE TRIGGER
Pregunta
I am trying to create a trigger in a DB2
database that runs on the update of a column in one table, and then fills in another table with certain values.
For example, there is a power unit table with a FLEET_ID
column. Every time the FLEET_ID
is changed, I need to to create a new row in the TRANS_AUDIT
table.
The TRANS_AUDIT
schema is as follows:
CREATE TABLE LYNX.TRANS_AUDIT (
TA_ID INTEGER NOT NULL,
TA_KEY_VALUE VARCHAR(100),
TA_TABLE_CHANGED VARCHAR(40),
TA_FIELD_CHANGED VARCHAR(40),
TA_OLD_FIELD_VALUE VARCHAR(100),
TA_NEW_FIELD_VALUE VARCHAR(100),
TA_USER_WHO_CHANGED VARCHAR(128),
TA_DATE_CHANGED TIMESTAMP,
TA_COMMENT VARCHAR(40),
TA_OLD_FIELD_DOUBLE DOUBLE DEFAULT 0,
TA_NEW_FIELD_DOUBLE DOUBLE DEFAULT 0,
PRIMARY KEY (TA_ID)
);
Here is what I have so far, but I can't seem to get it to work, I am getting a "function sequence" error.
CREATE TRIGGER PU_UPD_FLEETID
AFTER UPDATE OF FLEET_ID ON PUNIT
REFERENCING OLD AS O NEW AS N
FOR EACH ROW
MODE DB2SQL
BEGIN ATOMIC
DECLARE
vTA_ID INTEGER;
IF(N.FLEET_ID <> O.FLEET_ID) THEN
SELECT MAX(TA_ID)+1 INTO vTA_ID; --generate a unique sequential id
INSERT INTO LYNX.TRANS_AUDIT
(TA_ID, TA_KEY_VALUE, TA_TABLE_CHANGED, TA_FIELD_CHANGED, TA_OLD_FIELD_VALUE,
TA_NEW_FIELD_VALUE, TA_USER_WHO_CHANGED, TA_DATE_CHANGED, TA_COMMENT,
TA_OLD_FIELD_DOUBLE, TA_NEW_FIELD_DOUBLE)
VALUES
(TA_ID, N.UNIT_ID , 'PUNIT', 'FLEET_ID', O.FLEET_ID, N.FLEET_ID , SESSION_USER
,CURRENT TIMESTAMP , '', '0' ,'0' );
END IF;
END;
No hay solución correcta
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