There is no getter for property named ‘id‘ in ‘class java.lang.Integer‘
一：发现问题
sql动态语句中如果 parameterType="int"
<select id="sel_campusinfo" parameterType="int" resultType="Campusinfo">
select cmpid,cmpname from campusinfo where state!='d' and cmpid=#{cmpid}
</select>
是正确的，但是如果加上if test
<select id="sel_campusinfo" parameterType="int" resultType="Campusinfo">
select cmpid,cmpname from campusinfo where state!='d' and cmpid!=0
<if test="cmpid!=0">and cmpid=#{cmpid}</if>
</select>则报错：
There is no getter for property named 'cmpid' in 'class java.lang.Integer'
出错原因：Mybatis默认采用ONGL解析参数，所以会自动采用对象树的形式取Integer.cmpid。Integer对象没有cmpid属性。如果不解析参数，mybatis自动识别传入的参数，不会报错。
二：解决办法
1.修改select语句
<select id="sel_campusinfo" parameterType="int" resultType="Campusinfo">
select cmpid,cmpname from campusinfo where state!='d' and cmpid!=0
<if test="_parameter!=0">and cmpid=#{_parameter}</if>
</select>参数名全部改为_parameter。
2.不修改sql，只修改接口
接口类：
Campusinfo sel_campusinfo( int cmpid);
改为：
Campusinfo sel_campusinfo(@Param(value="cmpid") int cmpid);
3.可以将参数包装在hashmap或者对象中作为参数