http://www.leftso.com/blog/765.html
不过有他的替代 choose,写法如下:
<choose><when test="params!=null">right JOIN</when><otherwise>LEFT JOIN</otherwise></choose>
复制 <choose><when test="params!=null">right JOIN</when><otherwise>LEFT JOIN</otherwise></choose>
以上即可实现 if else 逻辑
https://www.cnblogs.com/buzheng/p/12485464.html
MyBatis中if - else if - else 的使用
有表user(id, name, state, sex, age)
1、单个 if - else 使用。
根据状态不同进行查询
<select id="selectUserByState" resultType="com.bz.model.entity.User">SELECT*FROMuserWHERE1=1<choose><when test="state == 1">AND name = #{name1}</when><otherwise>AND name = #{name2}</otherwise></choose></select>
2、多个if -else if -else的使用。
<select id="selectUserByState" resultType="com.bz.model.entity.User">SELECT*FROMuserWHERE1=1<choose><when test="state == 1">AND name = #{name1}</when><when test="state == 2">AND name = #{name2}</when><otherwise>AND name = #{name3}</otherwise></choose></select>
如有不对之处希望大家指点。共同进步,谢谢!
https://www.cnblogs.com/a8457013/p/8033263.html
mybatis if-else(写法)
mybaits 中没有else要用chose when otherwise 代替
范例一
<!--批量插入用户-->
<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为一个整体
when是if
otherwise是else
范例二:
<select id="selectSelective" resultMap="xxx" parameterType="xxx">select<include refid="Base_Column_List"/>from xxxwhere 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
<choose><when test="">//...</when><otherwise>//...</otherwise>
</choose>
分类: mybatis
标签: mybatis