什么MySQL数据类型将存储此Java BigInteger？

Question

I'm using Java 6, Hibernate 4.1.0.Final, and Spring 3.1.1.RELEASE. I have a String (maximum of 32 characters) that I wish to convert to a number and then back again to a String. I want to know what MySQL (v 5.5) data type I should use to store the number (which I think is a BigInteger) and I would also like to know if there's a better way to do the conversion. Right now, I'm doing

// Convert to integer
final BigInteger bigInt = new BigInteger(myString.getBytes());

// Convert back to a string
final String oldString = new String(bigInt.toByteArray());

The Hibernate mapping on the field in question is

@Column(name = "ORDER_ID")
private BigInteger orderId;

Thanks for your help, -

Answer 1

Look at the NUMERIC datatype. I've used that to store very large decimal numbers up to 39 digits long.

The database field has a type of "NUMERIC(39)".

The hibernate mapping used was:

<property name="foo" type="big_integer" column="ORDER_ID" length="39"/>

To convert a string to a BigInteger from a hex string, use:

BigInteger bigInt = new BigInteger(myString, 16);