Hibernate从Java中的db获取数据后，返回整数的null

Question

Class
{
    private int objectId;
}
<result property="objectId" column="id" />

SQL MAP

Query returns null and the int field is set to null. so this line of code

object.getObjectId(); 

throws a null pointer exception.

How do i check if objectId is null or not? I see people using ResultSet in java, but i cannot

Answer 1

Change the type from int to Integer . Then it'll be able to be null , and you'll be able to check this at runtime.