MyBatis的注解

nescafeboy1

基于注解的mybatis和spring整合:http://huangmin001.iyunv.com/blog/1185806
这个文章说的很详细,很值得一看.

Mapper中注解（Annotation）的使用示例:http://puras.cn/mybatis-annotation-example
Mapper：
public interface RoleMapper {
final String SELECT_ALL = "SELECT * FROM nap_roles";
final String SELECT_BY_ID = "SELECT * FROM nap_roles WHERE id=#{id}";
final String INSERT = "INSERT INTO nap_roles(name, description, ctime, mtime) VALUES(#{name}, #{description}, #{creationTime}, #{modifiedTime})";
final String UPDATE = "UPDATE nap_roles SET name=#{name}, description=#{description}, mtime=#{modifiedTime} WHERE id=#{id}";
final String DELETE = "DELETE FROM nap_roles WHERE id=#{id}";
final String SELECT_BY_PAGE_BEGIN = "SELECT * FROM nap_roles";
final String SELECT_BY_PAGE_END = " limit #{startPosition}, #{maxResult}";
final String COUNT = "SELECT COUNT(id) FROM nap_roles WHERE 1=1 ";
@Insert(INSERT)
@Options(useGeneratedKeys = true, keyProperty = "id")
void create(Role role);
@Update(UPDATE)
void update(Role role);
@Delete(DELETE)
void delete(Long id);
@Select(SELECT_ALL)
@Results(value = {
@Result(property="id"),
@Result(property="name"),
@Result(property="description"),
@Result(property="creationTime", column="ctime"),
@Result(property="modifiedTime", column="mtime")
})
List findAll();
@SelectProvider(type = RoleProvider.class, method = "findByPage")
@Results(value = {
@Result(property="id"),
@Result(property="name"),
@Result(property="description"),
@Result(property="creationTime", column="ctime"),
@Result(property="modifiedTime", column="mtime")
})
List findByPage(Map params);
@Select(SELECT_BY_ID)
@Results(value = {
@Result(property="id"),
@Result(property="name"),
@Result(property="description"),
@Result(property="creationTime", column="ctime"),
@Result(property="modifiedTime", column="mtime")
})
Role findById(Long id);
@SelectProvider(type = RoleProvider.class, method = "getCount")
int getCount(Role role);
@Select(COUNT)
int count();
}

在使用比较复杂的SQL时，会用到各种Provider来处理。
虽然都改用Annotation了，但还有些地方不是特别的爽。
1、ResultMap，不知道怎么来定义一个对象，所有的都引用一个；
2、所有的SQL都写到JAVA里了，修改起来，也是件麻烦事。