mysql Trigger vor dem Einsetzen mehrere

Question

Ich habe eine Tabelle wie folgt aus: my_table_name

id | Name | tipo
1 | hallo | 0
2 | Welt | 0
3 | hello3 | 0

CREATE TRIGGER first_trigger BEFORE INSERT ON my_table_name 
FOR EACH ROW 
BEGIN 
    IF (NEW.`tipo` <> 100) 
    THEN  
     SET NEW.tipo = 0; 
    ELSE  
     SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Error'; 
    END IF; 
END 

Ich möchte diese SQL-Anweisung einfügen, wo ich mehrere Zeilen mich das erste Einsätze ist falsch und das zweite ist rechts

INSERT INTO my_table_name(id, name, tipo) VALUES (4, 'hello1', 100), (5, 'hello5', 50); 

resut Tabelle:

id | Name | tipo
1 | hallo | 0
2 | Welt | 0
3 | hello3 | 0
5 | hello5 | 0

Answer 1

In dem von Ihnen vorgestellten Szenario ist es relativ einfach zu erreichen, was Sie brauchen.

Das Problem tritt auf, wenn die Tabelle leer ist.

mysql> DELIMITER // 

mysql> DROP TABLE IF EXISTS `my_table_name`// 
Query OK, 0 rows affected (0,00 sec) 

mysql> CREATE TABLE IF NOT EXISTS `my_table_name` (
    -> `id` INT UNSIGNED NOT NULL PRIMARY KEY, 
    -> `name` VARCHAR(25), 
    -> `tipo` INT UNSIGNED NOT NULL 
    ->)// 
Query OK, 0 rows affected (0,00 sec) 

mysql> CREATE TRIGGER `first_trigger` BEFORE INSERT ON `my_table_name` 
    -> FOR EACH ROW 
    -> BEGIN 
    -> IF NEW.`tipo` != 100 THEN 
    ->  SET NEW.`tipo` := 0; 
    -> ELSE 
    ->  SET NEW.`id` := (SELECT `id` FROM `my_table_name` LIMIT 1); 
    -> END IF; 
    -> END// 
Query OK, 0 rows affected (0,00 sec) 

mysql> DELIMITER ; 

mysql> INSERT INTO `my_table_name` 
    -> (`id`, `name`, `tipo`) 
    -> VALUES 
    -> (1, 'hello', 0), (2, 'world', 0), (3, 'hello3', 0); 
Query OK, 3 rows affected (0,01 sec) 
Records: 3 Duplicates: 0 Warnings: 0 

mysql> SELECT 
    -> `id`, 
    -> `name`, 
    -> `tipo` 
    -> FROM 
    -> `my_table_name`; 
+----+--------+------+ 
| id | name | tipo | 
+----+--------+------+ 
| 1 | hello | 0 | 
| 2 | world | 0 | 
| 3 | hello3 | 0 | 
+----+--------+------+ 
3 rows in set (0,00 sec) 

mysql> INSERT IGNORE `my_table_name` 
    -> (`id`, `name`, `tipo`) 
    -> VALUES 
    -> (4, 'hello1', 100), (5, 'hello5', 50); 
Query OK, 1 row affected, 1 warning (0,00 sec) 
Records: 2 Duplicates: 1 Warnings: 1 

mysql> SHOW WARNINGS; 
+---------+------+---------------------------------------+ 
| Level | Code | Message        | 
+---------+------+---------------------------------------+ 
| Warning | 1062 | Duplicate entry '1' for key 'PRIMARY' | 
+---------+------+---------------------------------------+ 
1 row in set (0,00 sec) 

mysql> SELECT 
    -> `id`, 
    -> `name`, 
    -> `tipo` 
    -> FROM 
    -> `my_table_name`; 
+----+--------+------+ 
| id | name | tipo | 
+----+--------+------+ 
| 1 | hello | 0 | 
| 2 | world | 0 | 
| 3 | hello3 | 0 | 
| 5 | hello5 | 0 | 
+----+--------+------+ 
4 rows in set (0,00 sec) 

UPDATE

Eine weitere Option (egal ob die Tabelle leer ist) ist mit Klausel WITH CHECK OPTION eine aktualisierbare Ansicht zu verwenden.

mysql> DELIMITER // 

mysql> DROP VIEW IF EXISTS `view_my_table_name`// 
Query OK, 0 rows affected (0,00 sec) 

mysql> DROP TABLE IF EXISTS `my_table_name`// 
Query OK, 0 rows affected (0,00 sec) 

mysql> CREATE TABLE IF NOT EXISTS `my_table_name` (
    -> `id` INT UNSIGNED NOT NULL PRIMARY KEY, 
    -> `name` VARCHAR(25), 
    -> `tipo` INT UNSIGNED NOT NULL 
    ->)// 
Query OK, 0 rows affected (0,00 sec) 

mysql> CREATE VIEW `view_my_table_name` AS 
    -> SELECT `id`, `name`, `tipo` 
    -> FROM `my_table_name` 
    -> WHERE `tipo` != 100 
    -> WITH LOCAL CHECK OPTION// 
Query OK, 0 rows affected (0,01 sec) 

mysql> CREATE TRIGGER `first_trigger` BEFORE INSERT ON `my_table_name` 
    -> FOR EACH ROW 
    -> BEGIN 
    -> IF NEW.`tipo` != 100 THEN 
    ->  SET NEW.`tipo` := 0; 
    -> END IF; 
    -> END// 
Query OK, 0 rows affected (0,00 sec) 

mysql> DELIMITER ; 

mysql> INSERT INTO `my_table_name` 
    -> (`id`, `name`, `tipo`) 
    -> VALUES 
    -> (1, 'hello', 0), (2, 'world', 0), (3, 'hello3', 0); 
Query OK, 3 rows affected (0,00 sec) 
Records: 3 Duplicates: 0 Warnings: 0 

mysql> SELECT 
    -> `id`, 
    -> `name`, 
    -> `tipo` 
    -> FROM 
    -> `my_table_name`; 
+----+--------+------+ 
| id | name | tipo | 
+----+--------+------+ 
| 1 | hello | 0 | 
| 2 | world | 0 | 
| 3 | hello3 | 0 | 
+----+--------+------+ 
3 rows in set (0,00 sec) 

mysql> INSERT IGNORE `view_my_table_name` 
    -> (`id`, `name`, `tipo`) 
    -> VALUES 
    -> (4, 'hello4', 100), (5, 'hello5', 50); 
Query OK, 1 row affected, 1 warning (0,00 sec) 
Records: 1 Duplicates: 0 Warnings: 1 

mysql> SHOW WARNINGS; 
+---------+------+--------------------------------------------+ 
| Level | Code | Message         | 
+---------+------+--------------------------------------------+ 
| Warning | 1369 | CHECK OPTION failed '_.view_my_table_name' | 
+---------+------+--------------------------------------------+ 
1 row in set (0,00 sec) 

mysql> SELECT 
    -> `id`, 
    -> `name`, 
    -> `tipo` 
    -> FROM 
    -> `my_table_name`; 
+----+--------+------+ 
| id | name | tipo | 
+----+--------+------+ 
| 1 | hello | 0 | 
| 2 | world | 0 | 
| 3 | hello3 | 0 | 
| 5 | hello5 | 0 | 
+----+--------+------+ 
4 rows in set (0,00 sec)