code: public ResultMap getResultMap(Configuration configuration) {
          if (this.resultMap != null) {
              return this.resultMap;
          }
          if (entityClassColumns == null || entityClassColumns.size() == 0) {
              return null;
          }
          List<ResultMapping> resultMappings = new ArrayList<ResultMapping>();
          for (EntityColumn entityColumn : entityClassColumns) {
              String column = entityColumn.getColumn();
              //去掉可能存在的分隔符
              Matcher matcher = DELIMITER.matcher(column);
              if(matcher.find()){
                  column = matcher.group(1);
              }
              ResultMapping.Builder builder = new ResultMapping.Builder(configuration, entityColumn.getProperty(), column, entityColumn.getJavaType());
              if (entityColumn.getJdbcType() != null) {
                  builder.jdbcType(entityColumn.getJdbcType());
              }
              if (entityColumn.getTypeHandler() != null) {
                  try {
                      builder.typeHandler(getInstance(entityColumn.getJavaType(),entityColumn.getTypeHandler()));
                  } catch (Exception e) {
                      throw new MapperException(e);
                  }
              }
              List<ResultFlag> flags = new ArrayList<ResultFlag>();
              if (entityColumn.isId()) {
                  flags.add(ResultFlag.ID);
              }
              builder.flags(flags);
              resultMappings.add(builder.build());
          }
          ResultMap.Builder builder = new ResultMap.Builder(configuration, "BaseMapperResultMap", this.entityClass, resultMappings, true);
          this.resultMap = builder.build();
          return this.resultMap;
      }
docs: 生成当前实体的resultMap对象
  
  @param configuration
  @return