Saturday, 16 February 2019

simple mysql trigger

Category : MySql
sekarang saya mencoba untuk memberikan sedikit tutorial dasar tentang mysql trigger. trigger itu gunanya sangat banyak sekali, kita langsung ke contoh ok?

misalnya kita punya table seperti ini :
Table_blog Table_kategori
- id_blog (PK)
- id_kategori (FK)
- judul_blog
- isi_blog
- id_kategori (PF)
- nama_kategori

di table di atas terlihat ada hubungan one to many antara table_blog dengan table_kategori. dimana 1 blog hanya memiliki 1 kategori. tapi 1 kategori bisa di miliki banyak blog.

mari kita berikan sedikit data pada tabel di atas

id_blog id_kategori judul_blog isi_blog
 1  1 dasar  php
 ini adalah isi blog "dasar php"
 2  1 php lanjutan  ini adalah isi blog "php lanjutan"
 3  2 simple javascript
 ini adalah isi blog "simple javascript"

id_kategori nama_kategori
1 PHP Script
2 Javascript

pada kasus ini jadi bila kita menghilangkan kategori "php script" maka klo dalam sisi programing kita harus query lagi untuk menghapus dalam table_blog. nah sebenernya ada cara laen, yaitu mengunakan trigger dari mysql. sintaknya untuk menyelesaikan permasalahan di atas adalah :


CREATE TRIGGER table_kategori_del AFTER DELETE on table_kategori   
DELETE FROM table_blog WHERE id_kategori = OLD.id_kategori;


perintah di atas memberitahukan mysql setelah ada penghapusan (AFTER DELETE) pada table_kategori lakukan penghapusan blog dengan kategori yang telah di hapus.

dalam pembahasan kali ini hanya membahas penghapusan, tapi ada template trigger yang bisa di pake sebagai referensi :


DROP TRIGGER `trigger_name`$$

  INSERT INTO test2 SET a2 = NEW.a1;
  DELETE FROM test3 WHERE a3 = NEW.a1;
  UPDATE test4 SET b4 = b4 + 1 WHERE a4 = NEW.a1;END$$

semoga berguna

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