范例一
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<!--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>
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其中choose为一个整体
when是if
otherwise是else
范例二：
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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>
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下面就是MyBatis中的if....else...表示方法
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<choose>
<when test="">
//...
</when>
<otherwise>
//...
</otherwise>
</choose>
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