MyBatis基于注解实现复杂的多条件SQL语句查询

@Component
public interface UserMapper extends Mapper<User>, MySqlMapper<User> {

    @SelectProvider(type = DynamicDataDaoProvider.class, method = "selectUserByid")
    List<User> selectUserByidIn(@Param("list") List<Integer> list);

    @SelectProvider(type = DynamicDataDaoProvider.class, method = "getCity")
    List<User> getCity(@Param("id") Integer id, @Param("email") String email);


    class DynamicDataDaoProvider{
        public String getCity(@Param("id") Integer id, @Param("email") String email){
            return new SQL(){{
                    SELECT(" * ");
                    FROM("orm_user");
                    if(id != null) WHERE("id = #{id}");
                    if(email != null) {
                        OR(); WHERE("email = #{email}");
                    }
                }}.toString();
        }
        public String selectUserByid(@Param("list") List<Integer> list){
            StringBuffer sql = new StringBuffer("select * from orm_user u where u.id in (");
            for(int i : list){
                sql.append(i + ", ");
            }
            sql.delete(sql.length()-2, sql.length());
            sql.append(")");
            return sql.toString();
        }
    }
}

注意： 参数之间要用@Param注解来做关联