这个标签我用的比较少，所以收集几个案例先，等未来有需求了再深入研究：
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<select id="getUserList_choose" resultMap="resultMap_user" parameterType="com.yiibai.pojo.User">
SELECT * FROM User u
<where>
<choose>
<when test="username !=null ">
u.username LIKE CONCAT(CONCAT('%', #{username, jdbcType=VARCHAR}),'%')
</when >
<when test="sex != null and sex != '' ">
AND u.sex = #{sex, jdbcType=INTEGER}
</when >
<when test="birthday != null ">
AND u.birthday = #{birthday, jdbcType=DATE}
</when >
<otherwise>
</otherwise>
</choose>
</where>
</select>
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