MySQL data storage question

How would开发者_JAVA技巧 I store the following code below its output in my Mysql table? How would the field be made?

md5(uniqid(microtime(),1))

example.

field CHAR(128) NOT NULL

field CHAR(32) NOT NULL

The output of MD5() will always be 32 characters long

But of course you can save it in a binary format, in this case you should use:

field BINARY(16) NOT NULL