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Data Base model

Hi

I want to store and retrieve data. The data represent invoice that has may simple item or complex item. The invoice may have an undetermined number of items.

E.g.
Invoice 1
    Item 1
        Item 1.1
            Item 1.1.1
        Item 1.2
     Item 2
     Item 3

What is the best way to design such data base. I think about recursive table but iam not sure if that's right.


Thanks.
0
ang3lus
Asked:
ang3lus
1 Solution
 
johanntagleCommented:
I would go for two tables.  One for Invoice, which includes other non-item data (client, date, etc).  Then one for Invoice_Items.  Among other fields describing the item, this table will have InvoiceID (or InvoiceNumber) which will determine which invoice it belongs to, then a parent_item_id which has the value of the id of the parent item if the entry is a sub-item.  Something like:

mysql> desc invoices;
+--------------+-------------+------+-----+---------+----------------+
| Field        | Type        | Null | Key | Default | Extra          |
+--------------+-------------+------+-----+---------+----------------+
| id           | int(11)     | NO   | PRI | NULL    | auto_increment |
| invoice_date | date        | YES  |     | NULL    |                |
| client_name  | varchar(30) | YES  |     | NULL    |                |
+--------------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

mysql> desc invoice_items;
+----------------+-------------+------+-----+---------+----------------+
| Field          | Type        | Null | Key | Default | Extra          |
+----------------+-------------+------+-----+---------+----------------+
| id             | int(11)     | NO   | PRI | NULL    | auto_increment |
| invoice_id     | int(11)     | YES  |     | NULL    |                |
| item_name      | varchar(30) | YES  |     | NULL    |                |
| parent_item_id | int(11)     | YES  |     | NULL    |                |
+----------------+-------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)

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