mybatis 中高级结果映射的官方文档示例：
http://www.mybatis.org/mybatis-3/zh/sqlmap-xml.html#a
其中使用的列映射是在xml中直接配置的，比如：
实际使用中我们经常在属性配置时使用 autoMapping, columnPrefix 来做字段映射，按照之前的想法直接在 select 时添加前缀的方式匹配不上， 需要在select时，根据层级关系添加对应的父级的columnPrefix:
例子：
select 语句：
SELECT
ew.workflow_code AS ew_workflow_code,
ew.workflow_name AS ew_workflow_name,
ew.workflow_sequence_default AS ew_workflow_sequence_default,
ew.workflow_sequence_customized AS ew_workflow_sequence_customized,
ew.module_code AS ew_module_code,
ew.component_code AS ew_component_code,
ew.is_enable AS ew_is_enable,
ew.is_default AS ew_is_default,
ew.created_at AS ew_created_at,
ew.updated_at AS ew_updated_at,
ec.connection_code AS ew_ec_connection_code,
ec.type AS ew_ec_type,
ec.url AS ew_ec_url,
ec.user AS ew_ec_user,
ec.engine_id AS ew_ec_engine_id,
ec.created_at AS ew_ec_created_at,
ec.updated_at AS ew_ec_updated_at,
ewts.workflow_token_code AS ew_ewts_workflow_token_code,
ewts.source_table_alias_name AS ew_ewts_source_table_alias_name,
ewts.source_column_name AS ew_ewts_source_column_name,
ewts.source_column_expression_default AS ew_ewts_source_column_expression_default,
ewts.source_column_expression_customized AS ew_ewts_source_column_expression_customized,
ewts.target_column_alias_name AS ew_ewts_target_column_alias_name,
ewts.is_enable AS ew_ewts_is_enable,
ewts.is_default AS ew_ewts_is_default,
ewts.created_at AS ew_ewts_created_at,
ewts.updated_at AS ew_ewts_updated_at,
ewtfj.workflow_token_code AS ew_ewtfj_workflow_token_code,
ewtfj.source_db_name AS ew_ewtfj_source_db_name,
ewtfj.source_table_name AS ew_ewtfj_source_table_name,
ewtfj.source_table_expression AS ew_ewtfj_source_table_expression,
ewtfj.source_table_alias_name AS ew_ewtfj_source_table_alias_name,
ewtfj.is_primary_table AS ew_ewtfj_is_primary_table,
ewtfj.join_type AS ew_ewtfj_join_type,
ewtfj.join_on_current_column_name AS ew_ewtfj_join_on_current_column_name,
ewtfj.join_on_right_table_alias_name AS ew_ewtfj_join_on_right_table_alias_name,
ewtfj.join_on_right_table_column_name AS ew_ewtfj_join_on_right_table_column_name,
ewtfj.join_on_expression AS ew_ewtfj_join_on_expression,
ewtfj.is_enable AS ew_ewtfj_is_enable,
ewtfj.is_default AS ew_ewtfj_is_default,
ewtfj.created_at AS ew_ewtfj_created_at,
ewtfj.updated_at AS ew_ewtfj_updated_at,
ewtfj.workflow_token_code AS ew_ewtf_workflow_token_code,
ewtf.common_filter_expression AS ew_ewtf_common_filter_expression,
ewtf.common_filter_expression_customized AS ew_ewtf_common_filter_expression_customized,
ewtf.incremental_filter_expression AS ew_ewtf_incremental_filter_expression,
ewtf.incremental_filter_expression_customized AS ew_ewtf_incremental_filter_expression_customized,
ewtf.range_filter_expression AS ew_ewtf_range_filter_expression,
ewtf.range_filter_expression_customized AS ew_ewtf_range_filter_expression_customized,
ewtf.is_enable AS ew_ewtf_is_enable,
ewtf.is_default AS ew_ewtf_is_default,
ewtf.created_at AS ew_ewtf_created_at,
ewtf.updated_at AS ew_ewtf_updated_at
...
注意其中select as 的字段名称，添加了resultMap中的层级关系。