MyBatis+MySQL 返回插入的主键ID

<insert id="insertAndGetId" useGeneratedKeys="true" keyProperty="userId" parameterType="com.chenzhou.mybatis.User">
	insert into user(userName,password,comment)
	values(#{userName},#{password},#{comment})
</insert>

　　

public class User {
	private int userId;
	private String userName;
	private String password;
	private String comment;
	
	//setter and getter
}

　　

public interface UserDao {

	public int insertAndGetId(User user);

}

　　

User user = new User();
user.setUserName("chenzhou");
user.setPassword("xxxx");
user.setComment("测试插入数据返回主键功能");

System.out.println("插入前主键为："+user.getUserId());
userDao.insertAndGetId(user);//插入操作
System.out.println("插入后主键为："+user.getUserId());