Java-MyBatis-????????? MyBatis ??? in ?????????2

Posted 2021-02-02

??????????????????   and   logs   float   name   ??????   span   inf   user   

ylbtech-Java-MyBatis-????????? MyBatis ??? in ?????????2

 

1.????????????

1???

????????????

???SQL??????????????????????????????in???????????????????????????????????????:

select * from HealthCoupon where useType in ( ???4??? , ???3??? )
???????????????MyBatis????????????in??????,?????????????????????,???????????????:

Map<String, Object> selectByUserId(@Param("useType") String useType)

<select id="selectByUserId" resultMap="BaseResultMap" parameterType="java.lang.String">
select * from HealthCoupon where useType in (#{useType,jdbcType=VARCHAR})
</select>

??????useType="2,3";???????????????,???????????????,??????MyBatis?????????????????????MyBatis????????????foreach????????????IN??????,foreach????????????:

foreach???????????? collection?????????????????????????????????List????????????map??????
?collection??? ?????????mapper.java???@Param??????????????????????????????
?item??? ???????????????????????????????????????????????????????????????????????????????????????????????????#{}????????????????????????
index???????????????????????????????????????????????????(??????)
open???????????? sql????????????????????????????????????()?????????
?close?????????
separator???????????????????????????????????????????????????????????????
????????????????????????????????????:

(???)???selectByIdSet(List idList)

????????????????????????List, ??????????????????collection???????????????????????? list

List<User> selectByIdSet(List idList);

<select id="selectByIdSet" resultMap="BaseResultMap">
SELECT
<include refid="Base_Column_List" />
from t_user
WHERE id IN
<foreach collection="list" item="id" index="index" open="(" close=")" separator=",">
#{id}
</foreach>
</select>

(???)???List<User> selectByIdSet(String[] idList)

????????????????????????Array,??????????????????collection???????????????????????? array

List<User> selectByIdSet(String[] idList);

<select id="selectByIdSet" resultMap="BaseResultMap">
SELECT
<include refid="Base_Column_List" />
from t_user
WHERE id IN
<foreach collection="array" item="id" index="index" open="(" close=")" separator=",">
#{id}
</foreach>
</select>

 

(???)?????????????????????

??????????????????????????????,?????????????????????????????????????????????@Param("xxx")??????????????????????????????????????????Map???????????????

3.1 @Param("xxx")??????

List<User> selectByIdSet(@Param("name")String name, @Param("ids")String[] idList);

<select id="selectByIdSet" resultMap="BaseResultMap">
SELECT
<include refid="Base_Column_List" />
from t_user
WHERE name=#{name,jdbcType=VARCHAR} and id IN
<foreach collection="idList" item="id" index="index"
open="(" close=")" separator=",">
#{id}
</foreach>
</select>

3.2 Map??????

Map<String, Object> params = new HashMap<String, Object>(2);
params.put("name", name);
params.put("idList", ids);
mapper.selectByIdSet(params);

<select id="selectByIdSet" resultMap="BaseResultMap"> 
select 
<include refid="Base_Column_List" /> 
from t_user where 
name = #{name}
and ID in 
<foreach item="item" index="index" collection="idList" open="(" separator="," close=")"> 
#{item} 
</foreach> 
</select>

2???

2.????????????

 

3.????????????

 

4.????????????

 

5.????????????

 

 

6.????????????

 

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