mybatis批量操作方法
插入数据SQL语句
oracle :
insert into sss
(
a,b
)
select '11','aaa' from dual union all
select '22','bbb' from dual
而在mssql和mysql中是这样的：
insert into sss
(
a,b
)
values('1','2'),('11','2')
mybatis xml
<!-- 批量插入for 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>
<!-- 批量插入for Other -->
<insert id="insertBatch4Other" parameterType="List">
insert into aa
(
a,b
)
VALUES
<foreach collection="list" item="obj" index="index" separator="," >
(
#{obj.a},#{obj.b}
)
</foreach>
</insert>
更新数据
SQL语句
update *** set *** where ** in(....)
这种语句 in所在的集合有条数限制 为1000条，当我们在批量更新千条以上数据时就会有问题，解决方法可以分段在执行，1000条记录为一段。
mybatis xml
<update id="updateBatch" parameterType="Map">
update aa set
a=#{fptm},
b=#{csoftrain}
where c in
<foreach collection="cs" index="index" item="item" open="("separator=","close=")">
#{item}
</foreach>
</update>
oracle插入数据时，使用SEQ
mybatis xml
<insert id="insertBatch" parameterType="ArrayList" useGeneratedKeys="true">
<selectKey keyProperty="deptno" order="BEFORE" resultType="int">
SELECT S_FORUM_USERID.NEXTVAL FROM DUAL
</selectKey>
INSERT INTO DEPT(DEPTNO , DNAME , LOC) SELECT S_FORUM_USERID.NEXTVAL , A.* FROM (
<foreach collection="list" item="item" index="index" separator="UNION">
SELECT #{item.dname} , #{item.loc} FROM DUAL
</foreach>
) A
</insert>
指定数据类型
mybatis xml
<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>
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