Mybatis批量操作
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批量插入
void batchInsertBackup(List<UserRights> list);
<insert id ="batchInsertBackup" parameterType="java.util.List" >
insert into user_rights_backup
(id,supplier_id,user_id,rights_id,rules_id,
start_time,end_time,goods_no,has_num,type,
status,ctime,mtime,biz_type,first_type,
is_limit_time)
values
<foreach collection ="list" item="entityRecord" index= "index" separator =",">
(
#{entityRecord.id}, #{entityRecord.supplierId},#{entityRecord.userId},#{entityRecord.rightsId},#{entityRecord.rulesId},
#{entityRecord.startTime}, #{entityRecord.endTime}, #{entityRecord.goodsNo},#{entityRecord.hasNum},#{entityRecord.type},
#{entityRecord.status},#{entityRecord.ctime},#{entityRecord.mtime},#{entityRecord.bizType},#{entityRecord.firstType},
#{entityRecord.isLimitTime}
)
</foreach >
</insert >
批量删除源数据
void batchDelete(List<UserRights> list);
<delete id="batchDelete" parameterType="java.util.List" >
delete from user_rights where id in (
<foreach collection="list" item="entity" index= "index" separator=",">
#{entity.id}
</foreach>
)
</delete>
根据id,批量查询
List<UserRights> batchQuery(List<Long> idList);
<select id="batchQuery" resultMap="BaseResultMap" parameterType="java.util.List">
select
<include refid="base_column_list"/>
from user_rights
where id in
<foreach collection="list" index="index" item="item" separator="," open="(" close=")">
#{item,jdbcType=BIGINT}
</foreach>
</select>
根据id,批量更新时间和状态
<update id="updateBatch" parameterType="java.util.List">
update user_rights
<trim prefix="set" suffixOverrides=",">
<trim prefix="status = case" suffix="end,">
<foreach collection="list" item="item" index="index">
when id=#{item.id} then #{item.status}
</foreach>
</trim>
<trim prefix=" start_time = case" suffix="end,">
<foreach collection="list" item="item" index="index">
when id=#{item.id} then #{item.startTime}
</foreach>
</trim>
</trim>
where id in
<foreach collection="list" index="index" item="item" separator="," open="(" close=")">
#{item.id,jdbcType=BIGINT}
</foreach>
</update>
首先,mysql需要数据库连接配置&allowMultiQueries=true
jdbc:mysql://127.0.0.1:3306/mybank?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
oracle下支持执行多条语句,下面3个相同
<update id="batchUpdate" parameterType="java.util.List"> <foreach collection="list" item="item" index="index" open="begin" close=";end;" separator=";" > update T_EMP_1 <set> age = #{item.age}+1,name=#{item.name} </set> where id = #{item.id} </foreach> </update>
<update id="batchUpdate" parameterType="java.util.List"> <foreach collection="list" item="item" index="index" open="begin" close="end;" separator="" > update T_EMP_1 <set> age = #{item.age}+1,name=#{item.name} </set> where id = #{item.id}; </foreach> </update>
<update id="batchUpdate" parameterType="java.util.List"> begin <foreach collection="list" item="item" index="index" separator="" > update T_EMP_1 <set> age = #{item.age}+1,name=#{item.name} </set> where id = #{item.id}; </foreach> end; </update>
foreach的主要用在构建in条件中,它可以在SQL语句中进行迭代一个集合。foreach元素的属性主要有 item,index,collection,open,separator,close。item表示集合中每一个元素进行迭代时的别名,index指 定一个名字,用于表示在迭代过程中,每次迭代到的位置,open表示该语句以什么开始,separator表示在每次进行迭代之间以什么符号作为分隔 符,close表示以什么结束,在使用foreach的时候最关键的也是最容易出错的就是collection属性,该属性是必须指定的,但是在不同情况 下,该属性的值是不一样的,主要有一下3种情况:
1. 如果传入的是单参数且参数类型是一个List的时候,collection属性值为list
2. 如果传入的是单参数且参数类型是一个array数组的时候,collection的属性值为array
3. 如果传入的参数是多个的时候,我们就需要把它们封装成一个Map了,当然单参数也可以封装成map,实际上如果你在传入参数的时候,在breast里面也是会把它封装成一个Map的,map的key就是参数名,所以这个时候collection属性值就是传入的List或array对象在自己封装的map里面的key
批量删除
<delete id="batchDeleteStudent" parameterType="List"> DELETE FROM STUDENT WHERE id IN <foreach collection="list" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </delete>
批量更新 注意:oracle中 形如 update *** set *** where ** in(....) 这种语句 in所在的集合有条数限制 为1000条
<update id="batchUpdateStudent" parameterType="List"> UPDATE STUDENT SET name = "5566" WHERE id IN <foreach collection="list" item="item" index="index" open="(" separator="," close=")" > #{item} </foreach> </update>
<update id="batchUpdateStudentWithMap" parameterType="Map" > UPDATE STUDENT SET name = #{name} WHERE id IN <foreach collection="idList" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </update>
批量插入 mysql和oracle不一样
mysql: <insert id="batchInsertStudent" parameterType="java.util.List"> INSERT INTO STUDENT (id,name,sex,tel,address) VALUES <foreach collection="list" item="item" index="index" separator="," > (#{item.id},#{item.name},#{item.sex},#{item.tel},#{item.address}) </foreach> </insert>
oracle: <insert id="insertBatch4Oracle" parameterType="List"> insert into aa(a,b) <foreach collection="list" item="item" index="index" separator="union all" > select #{item.a},#{item.b} from dual </foreach> </insert>
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