命名sql使用sum( $field$ )动态统计总数，执行报错：Caused by: com.primeton.ext.data.xpath.IllegalXPathException: has illegal literal 'SUM(OPERATOR_ID)' in xpath 'SUM(OPERATOR_ID)'.

【问题描述】

想通过命名sql，动态统计Platform7.6系统表cap_user对应列值的总数，执行出错

命名sql:

<sqlMap>    

<select id="select_id" parameterClass="java.util.Map" resultClass="commonj.sdo.DataObject">      

select sum( $field$ ) from cap_user    

</select>

</sqlMap>

调用命名sql的逻辑流，param为java.util.HashMap类型

报错信息：

Caused by: com.primeton.das.sql.impl.ibatis.common.jdbc.exception.NestedSQLException:  

--- The error occurred in C:\primeton\platform76\apache-tomcat-7.0.54\webapps\default\WEB-INF\_srv\work\user\com.primeton.eos.demo\com\primeton\eos\demo\newnamingsql.namingsql.  --- The error occurred while applying a result map. 

--- Check the com.primeton.eos.demo.newnamingsql.select_id-AutoResultMap. 

--- Check the result mapping for the 'SUM(OPERATOR_ID)' property. 

--- Cause: com.primeton.ext.data.xpath.IllegalXPathException: has illegal literal 'SUM(OPERATOR_ID)' in xpath 'SUM(OPERATOR_ID)'.  at com.primeton.das.sql.impl.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:263)  at com.primeton.das.sql.impl.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:166)  at com.primeton.das.sql.impl.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:634)  

...... Caused by: com.primeton.ext.data.xpath.IllegalXPathException: has illegal literal 'SUM(OPERATOR_ID)' in xpath 'SUM(OPERATOR_ID)'.

【解决方案】

问题原因：因为sum( $field$ )的返回结果根据resultClass映射出错，可参考如下两种方式调整命名sql，demo见附件:

1】<sqlMap>    

<select id="select_id" parameterClass="java.util.HashMap" resultClass="commonj.sdo.DataObject">      

select sum($field$) as 'total' from cap_user    

</select>

</sqlMap>

2】<sqlMap>    

<select id="select_id" parameterClass="java.util.HashMap" resultClass="java.lang.Integer">      

select sum($field$) from cap_user    

</select>

</sqlMap>

demo.zip