MyBatis中批量插入
方法一：
<insert id="insertbatch" parameterType="java.util.List">
<selectKey keyProperty="fetchTime" order="BEFORE"
resultType="java.lang.String">
SELECT CURRENT_TIMESTAMP()
</selectKey>
insert into kangaiduoyaodian ( depart1, depart2, product_name,
generic_name, img, product_specification, unit,
approval_certificate, manufacturer, marketPrice, vipPrice,
website, fetch_time, productdesc ) values
<foreach collection="list" item="item" index="index"
separator=",">
( #{item.depart1}, #{item.depart2}, #{item.productName},
#{item.genericName}, #{item.img},
#{item.productSpecification}, #{item.unit},
#{item.approvalCertificate}, #{item.manufacturer},
#{item.marketprice}, #{item.vipprice}, #{item.website},
#{fetchTime}, #{item.productdesc} )
</foreach>
</insert>
方法二：
<insert id="batchInsertB2B" parameterType="ArrayList">
insert into xxxxtable(hkgs,hkgsjsda,office,asdf,ddd,ffff,supfullName,classtype,agent_type,remark)<foreach collection="list" item="item" index="index" separator="union all">select #{item.hkgs,jdbcType=VARCHAR},#{item.hkgsjsda,jdbcType=VARCHAR},#{item.office,jdbcType=VARCHAR},#{item.asdf,jdbcType=VARCHAR},#{item.ddd,jdbcType=VARCHAR},#{item.ffff,jdbcType=VARCHAR},#{item.supfullName,jdbcType=VARCHAR},0,0,#{item.remark,jdbcType=VARCHAR} from dual</foreach></insert>
可以考虑用union all来实现批量插入。
例如：insert into XX_TABLE(XX,XX,XX)select 'xx','xx','xx' union all select 'xx','xx','xx' union all select 'xx','xx','xx' ...先拼装好语句再动态传入insert into XX_TABLE(XX,XX,XX)后面部分
MyBatis中批量删除
<!-- 通过主键集合批量删除记录 -->
<delete id="batchRemoveUserByPks" parameterType="java.util.List">
DELETE FROM LD_USER WHERE ID in
<foreach item="item" index="index" collection="list" open="(" separator="," close=")">
#{item}
</foreach>
</delete>
MyBatis中in子句
1.只有一个参数
参数的类型要声明为List或Array
Sql配置如下：
<select id="selectProduct" resultMap="Map">
SELECT *
FROM PRODUCT
WHERE PRODUCTNO IN
<foreach item="productNo" index="index" collection="参数的类型List或array">
#{productNo}
</foreach>
</select>
2.多个参数
首先要将多个参数写入同一个map，将map作为一个参数传入mapper
Sql配置如下：
<select id="selectProduct" resultMap="Map">
SELECT *
FROM PRODUCT
WHERE PRODUCTNO IN
<foreach item="productNo" index="index" collection="map中集合参数的名称">
#{productNo}
</foreach>
</select>
MyBatis批量修改
<update id="updateOrders" parameterType="java.util.List">
update orders set state = '0' where no in <foreach collection="list" item="nos" open="(" separator="," close=")"> #{nos} </foreach> </update>