Mybatis中传参包There is no getter for property named 'XXX' in 'class java.lang.String'

Mybatis中传参包There is no getter for property named 'XXX' in 'class java.lang.String'

一、发现问题

<select id="queryStudentByNum" resultType="student" parameterType="string">

select num,name,phone from student  
<where> 
<if test = " num!=null and num!='' ">
AND num = #{num}
</if>
</where>
</select> 
Mybatis查询传入一个字符串传参数，报There is no getter for property named 'num' in 'class java.lang.String'。

二、解决问题

<select id="queryStudentByNum" resultType="student" parameterType="string">

select num,name,phone from student  
<where> 
<if test = "_parameter!=null">
AND num = #{_parameter}
</if>
</where>
</select>
无论参数名，都要改成"_parameter"。

三、原因分析

Mybatis默认采用ONGL解析参数，所以会自动采用对象树的形式取string.num值，引起报错。也可以public List methodName(@Param(value="num") String num)的方法说明参数值