首先,mysql需要資料庫連接配接配置&allowMultiQueries=true
jdbc:mysql://127.0.0.1:3306/mybank?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
oracle下支援執行多條語句,下面3個相同
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
<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>
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
<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>
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
<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>
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
foreach的主要用在建構in條件中,它可以在SQL語句中進行疊代一個集合。foreach元素的屬性主要有 item,index,collection,open,separator,close。item表示集合中每一個元素進行疊代時的别名,index指 定一個名字,用于表示在疊代過程中,每次疊代到的位置,open表示該語句以什麼開始,separator表示在每次進行疊代之間以什麼符号作為分隔 符,close表示以什麼結束,在使用foreach的時候最關鍵的也是最容易出錯的就是collection屬性,該屬性是必須指定的,但是在不同情況 下,該屬性的值是不一樣的,主要有一下3種情況:
1. 如果傳入的是單參數且參數類型是一個List的時候,collection屬性值為list
2. 如果傳入的是單參數且參數類型是一個array數組的時候,collection的屬性值為array
3. 如果傳入的參數是多個的時候,我們就需要把它們封裝成一個Map了,當然單參數也可以封裝成map,實際上如果你在傳入參數的時候,在breast裡面也是會把它封裝成一個Map的,map的key就是參數名,是以這個時候collection屬性值就是傳入的List或array對象在自己封裝的map裡面的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(....) 這種語句 in所在的集合有條數限制 為1000條
<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不一樣
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
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>
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)
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>
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiZpdmLlR2bjlHcvN2LcNXZnFWbp9CXt92YuM3ZvxmYuNmLu9Wbt92Yvw1LcpDc0RHaiojIsJye.gif)