@SelectProvider
@UpdateProvider
@InsertProvider
@DeleteProvider
example：

public interface UserMapper {
    @SelectProvider(type = SqlProvider.class, method = "selectUser")
    @ResultMap("userMap")
     public User getUser(long userId);

     public class SqlProvider {
        public String selectUser(long userId) {
          return "select * from user where userId=" + userId;
        }
    }  
}

但是，如果在getUser方法中，對(duì)userId方法使用了@Param注解的話，那么相應(yīng)selectUser方法必須接受Map<String, Object>做為參數(shù)：

@SelectProvider(type = SqlProvider.class, method = "selectUser2")
     @ResultMap("userMap")
     public User getUser2(@Param("userId") long userId);


 public String selectUser2(Map<String, Object> para) {
         return "select * from user where userId=" + para.get("userId");
  }