mybatis知识
一、封装ibatis中数据，设置外键值为集合1.封装mybatis中数据，设置外键值为集合list,通过配置<constructor>
<resultMap id="recordsResult" type="com.cmbstc.bass.system.po.MessageRecords" >
<constructor>
<idArg column="RECORDSID" javaType="int"/>
</constructor>
</resultMap>
2.需要添加构造方法
public MessageRecords(){
}
public MessageRecords(Integer recordsId){
this.recordsId = recordsId;
}
二、在mybatis中配置集合类型，使用关键字“collection”
1.在mybatis中配置集合类型，使用关键字“collection”
<resultMap id="messageResult" type="com.cmbstc.bass.system.po.Message">
<result property="messageId" column="MESSAGEID" />
<result property="messageContent" column="MESSAGECONTENT" />
<result property="status" column="STATUS" />
<result property="messageDate" column="MESSAGEDATE" />
<result property="msgType" column="MSGTYPE" />
<result property="messageTitle" column="MSGTITLE" />
<association property="creator" column="USERID" resultMap="usersResult"/>
<collection property="records" resultMap="recordsResult"/>
</resultMap>
2.association用来配置MessageRecords中的实体
<resultMap id="recordsResult" type="com.cmbstc.bass.system.po.MessageRecords" >
<constructor>
<idArg column="RECORDSID" javaType="int"/>
</constructor>
<!-- <result property="recordsId" column="RECORDSID" /> -->
<result property="status" column="MSGSTATUS" />
<association property="receiver" column="receiverID"
javaType="com.cmbstc.bass.system.po.User">
<result property="userId" column="receiverID" />
<result property="userName" column="receiverName" />
</association>
</resultMap>
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