set sql_mode=ORACLE;
:NEW.a := 1;
ERROR 42000: 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 'a := 1' at line 1
:OLD.a := 1;
ERROR 42000: 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 'a := 1' at line 1
:OLa.a := 1;
ERROR 42000: 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 'a := 1' at line 1
SELECT :NEW.a;
ERROR 42000: 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 'a' at line 1
SELECT :OLD.a;
ERROR 42000: 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 'a' at line 1
SELECT :OLa.a;
ERROR 42000: 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 'a' at line 1
CREATE TABLE t1 (a INT);
CREATE TRIGGER tr1 BEFORE INSERT ON t1 FOR EACH ROW NEW.a:= 10;
INSERT INTO t1 VALUES ();
SELECT * FROM t1;
a
10
DROP TRIGGER tr1;
DROP TABLE t1;
CREATE TABLE t1 (a INT);
CREATE TRIGGER tr1 BEFORE INSERT ON t1 FOR EACH ROW :NEW.a:= 10;
INSERT INTO t1 VALUES ();
SELECT * FROM t1;
a
10
DROP TRIGGER tr1;
DROP TABLE t1;
CREATE TABLE t1 (a INT);
CREATE TRIGGER tr1 BEFORE INSERT ON t1 FOR EACH ROW
BEGIN
IF :NEW.a IS NULL
THEN
:NEW.a:= 10;
END IF;
END;
/
INSERT INTO t1 VALUES (NULL);
SELECT * FROM t1;
a
10
DROP TRIGGER tr1;
DROP TABLE t1;
CREATE TABLE t1 (a INT);
CREATE TRIGGER tr1 BEFORE UPDATE ON t1 FOR EACH ROW
BEGIN
IF :OLD.a IS NULL
THEN
:NEW.a:= 10;
END IF;
END;
/
INSERT INTO t1 VALUES (NULL);
UPDATE t1 SET a=NULL;
SELECT * FROM t1;
a
10
DROP TRIGGER tr1;
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT, c INT);
CREATE TRIGGER tr1 BEFORE INSERT ON t1
FOR EACH ROW
DECLARE
cnt INT := 0;
BEGIN
IF :NEW.a IS NULL THEN cnt:=cnt+1; END IF;
IF :NEW.b IS NULL THEN cnt:=cnt+1; END IF;
IF :NEW.c IS NULL THEN :NEW.c:=cnt; END IF;
END;
/
INSERT INTO t1 VALUES ();
INSERT INTO t1 VALUES (1, NULL, NULL);
INSERT INTO t1 VALUES (NULL, 1, NULL);
INSERT INTO t1 VALUES (1, 1, NULL);
SELECT * FROM t1;
a	b	c
NULL	NULL	2
1	NULL	1
NULL	1	1
1	1	0
DROP TABLE t1;