mybatis xml mapper 文件中 if-else 寫法

https://www.cnblogs.com/pangguoming/p/8434541.html

mybaits 中沒有else要用chose when otherwise 代替

範例一

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<!--批量插入用戶--> <insert id="insertBusinessUserList" parameterType="java.util.List">     insert into `business_user` (`id` , `user_type` , `user_login` )     values     <foreach collection="list" index="index" item="item" separator=",">         <trim prefix="(" suffix=")" suffixOverrides=",">             <choose>                 <when test="item.id != null and item.id !=''">                     #{item.id,jdbcType=CHAR},                 </when>                 <otherwise>                     '',                 </otherwise>             </choose>             <choose>                 <when test="item.userType != null and item.userType !=''">                     #{item.userType,jdbcType=VARCHAR},                 </when>                 <otherwise>                     '',                 </otherwise>             </choose>         </trim>     </foreach> </insert>

 

其中choose爲一個整體 
when是if 
otherwise是else

範例二：

 

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<select id="selectSelective" resultMap="xxx" parameterType="xxx">     select     <include refid="Base_Column_List"/>     from xxx     where del_flag=0     <choose>         <when test="xxx !=null and xxx != ''">             and xxx like concat(concat('%', #{xxx}), '%')         </when>         <otherwise>             and xxx like '**%'         </otherwise>     </choose> </select>

 

 下面就是MyBatis中的if....else...表示方法

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<choose>     <when test="">         //...     </when>     <otherwise>         //...     </otherwise> </choose>