oracle的批量插入方式是：
insert into db(id, zgbh, shbzh)
select '1', '2', '3' from dual
union all select '2', '3', '4' from dual
union all select '3', '4', '5' from dual
union all select '4', '5', '6' from dual
union all select '5', '6', '7' from dual
由於項目使用到sequence生成id，剛開始的寫法：
<!-- 批次插入，List-->
<insert id="insertList" useGeneratedKeys="true" parameterType="java.util.List">
<selectKey resultType="long" keyProperty="id" order="BEFORE">
SELECT SEQ_xxx_DETAIL.NEXTVAL FROM DUAL
</selectKey>
insert into TBL_xxx_DETAIL
(
<include refid="allColumns"/>
)
<foreach collection="list" item="item" index="index" separator="UNION ALL" >
SELECT
#{id, jdbcType=NUMERIC javaType=long},
#{item.batchFundTitleId, jdbcType=NUMERIC javaType=long},
#{item.transactionRequestId, jdbcType=NUMERIC javaType=long},
#{item.arAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.bankServiceAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.receivedAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.realReceivedAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.verifyDate, jdbcType=DATE javaType=date},
#{item.verifyOp, jdbcType=VARCHAR javaType=string},
#{item.verifyStatus, jdbcType=INTEGER javaType=int},
#{item.created, jdbcType=VARCHAR javaType=string},
#{item.createdDate, jdbcType=DATE javaType=date},
#{item.createdIp, jdbcType=VARCHAR javaType=string},
#{item.modified, jdbcType=VARCHAR javaType=string},
#{item.modifiedDate, jdbcType=DATE javaType=date},
#{item.modifiedIp, jdbcType=VARCHAR javaType=string}
from dual
</foreach>
</insert>
這樣的寫法sequence的查詢方法只查詢一次，造成list中的對象的再插入時id都會一樣，違反主鍵的唯一性約束。
所以修改爲如下的形式：
<insert id="insertList" useGeneratedKeys="true" parameterType="java.util.List">
<selectKey resultType="long" keyProperty="id" order="BEFORE">
SELECT SEQ_xxx_DETAIL.NEXTVAL FROM DUAL
</selectKey>
insert into TBL_xxx_DETAIL
(
<include refid="allColumns"/>
) select SEQ_xxx_DETAIL.NEXTVAL,A.* from(
<foreach collection="list" item="item" index="index" separator="UNION ALL" >
SELECT
#{item.batchFundTitleId, jdbcType=NUMERIC javaType=long},
#{item.transactionRequestId, jdbcType=NUMERIC javaType=long},
#{item.arAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.bankServiceAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.receivedAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.realReceivedAmt, jdbcType=DECIMAL javaType=java.math.BigDecimal},
#{item.verifyDate, jdbcType=DATE javaType=date},
#{item.verifyOp, jdbcType=VARCHAR javaType=string},
#{item.verifyStatus, jdbcType=INTEGER javaType=int},
#{item.created, jdbcType=VARCHAR javaType=string},
#{item.createdDate, jdbcType=DATE javaType=date},
#{item.createdIp, jdbcType=VARCHAR javaType=string},
#{item.modified, jdbcType=VARCHAR javaType=string},
#{item.modifiedDate, jdbcType=DATE javaType=date},
#{item.modifiedIp, jdbcType=VARCHAR javaType=string}
from dual
</foreach>) A
</insert>
把foreach中的id去掉，foreach拼出來的數據作爲一張表A，然後從表A中查詢數據，再接上從sequence中讀取的值作爲id。這樣sequence的值就會多次讀取，id就會不一樣。
<selectKey resultType="long" keyProperty="id" order="BEFORE">
SELECT SEQ_xxx_DETAIL.NEXTVAL FROM DUAL
</selectKey>刪除後會報錯：SQL command not properly ended，暫時沒有查出來原因，有知道的原因的請告訴我哈。
以此文拋磚引玉吧，希望能有更合適的方式。
mysql的批量插入如下：
INSERT INTO MyTable(ID,NAME) VALUES(7,'003'),(8,'004'),(9,'005')
而且mysql有自增字段，可以把id設置爲自增的，這樣的話就不存在id一致的情況。
<insert id="insertBatch" >
insert into student ( NAME,SEX,ADDRESS,TELEPHONE,TID)
values
<foreach collection="list" item="item" index="index" open="(" separator="," close=")">
#{item.name},
#{item.sex},
#{item.address},
#{item.telephone},
#{item.tId}
</foreach>
</insert
============================================================================================
create database link DBLinkName connect to 用戶名 identified by 密碼
using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)'