mybatis java.lang.NumberFormatException: For input string: "D"

mybatis语句：

<if test="status!=null and status=='D' ">
            , PriorStatus = Status
</if>

报错：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error updating database.  Cause: java.lang.NumberFormatException: For input string: "D"
### Cause: java.lang.NumberFormatException: For input string: "D"
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79)
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)
    at com.sun.proxy.$Proxy92.update(Unknown Source)

但是原先的代码'VCID'不报错

<when test="resclassid=='VCID'">
                substr(resvalue,to_number(#{VCIDStartStrNum}),length(resvalue)-to_number(#{VCIDStartStrNum})) resvalue
</when>

原因：'D'只有1位，被认为是char。'VCID'不止一位，认为是String。

解决：

<if test="status!=null and status== &quot;D&quot;">
            , PriorStatus = Status
</if>