我应该在MySQL中为这些数据使用什么类型？

Question

I 'm not sure what type (set, integer, time, char, varchar, text,...) should I use for these data:

• IP
• personal message
• data and time
• title
• name (or surname)
• user-agent
• forum answer (or comment)
• email address
• country
• password
• custom session cookie

Answer 1

This depends a bit on your personal taste/your company's conventions, but I'd use:

• IP: CHAR(15)
• personal message: TEXT
• date and time: DATETIME
• title: VARCHAR(255)
• name (or surname): VARCHAR(255)
• user-agent: VARCHAR(255)
• forum answer (or comment): TEXT
• email address: VARCHAR(255)
• country: CHAR(2)
• password: VARCHAR(255)
• custom session cookie: VARCHAR(255)

Answer 2

This is kinda funny question, but i will answer for IP address.

You could store IP address in an INT UNSIGNED.

mysql> SELECT INET_ATON('192.168.0.10') AS ipn; 

mysql> SELECT INET_NTOA(3232235530) AS ipa; 

So you can store an IP address in an INT UNSIGNED (4 bytes) which is of course much more efficient and faster than a CHAR(15).