一:發現問題
sql動態語句中如果 parameterType="int"
<select id="sel_campusinfo" parameterType="int" resultType="Campusinfo">
select cmpid,cmpname from campusinfo where state!='d' and cmpid=#{cmpid}
</select>
是正確的,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>
則報錯:
There is no getter for property named 'cmpid' in 'class java.lang.Integer'
出錯原因:Mybatis默認採用ONGL解析參數,所以會自動採用對象樹的形式取Integer.cmpid。Integer對象沒有cmpid屬性。如果不解析參數,mybatis自動識別傳入的參數,不會報錯。
二:解決辦法
1.修改select語句
<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>
參數名全部改爲_parameter。
2.不修改sql,只修改接口
接口類:
Campusinfo sel_campusinfo( int cmpid);
改爲:
Campusinfo sel_campusinfo(@Param(value="cmpid") int cmpid);
3.可以將參數包裝在hashmap或者對象中作爲參數
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作者:cclovett
來源:CSDN
原文:https://blog.csdn.net/cclovett/article/details/12855505
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