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Batis的sqlMap配置文件的selectKey元素有个type属性,可以指定pre或者post表示前生成(pre)还是后生成(post)。
Oracle设置
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<!--
Oracle SEQUENCE
-->
2
<
insert
id
="insertProduct-ORACLE"
parameterClass
="com.domain.Product"
>
3
<
selectKey
resultClass
="int"
keyProperty
="id"
type
="pre"
>
4
<![CDATA[
SELECT STOCKIDSEQUENCE.NEXTVAL AS ID FROM DUAL
]]>
5
</
selectKey
>
6
<![CDATA[
insert into PRODUCT (PRD_ID,PRD_DESCRIPTION) values(#id#,#description#)
]]>
7
</
insert
>
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MS SQL Server配置
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<!--
Microsoft SQL Server IDENTITY Column
-->
2
<
insert
id
="insertProduct-MS-SQL"
parameterClass
="com.domain.Product"
>
3
<![CDATA[
insert into PRODUCT (PRD_DESCRIPTION) values(#description#)
]]>
4
<
selectKey
resultClass
="int"
keyProperty
="id"
type
="post"
>
5
<![CDATA[
SELECT @@IDENTITY AS ID
]]>
6
<!--
该方法不安全 应当用SCOPE_IDENTITY() 但这个函数属于域函数,需要在一个语句块中执行。
-->
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</
selectKey
>
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</
insert
>
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上述MS SQL Server配置随是官网提供的配置,但实际上却恰恰隐患重重!按下述配置,确保获得有效主键。
1
<!--
Microsoft SQL Server IDENTITY Column 改进
-->
2
<
insert
id
="insertProduct-MS-SQL"
parameterClass
="com.domain.Product"
>
3
<
selectKey
resultClass
="int"
keyProperty
="id"
>
4
<![CDATA[
insert into PRODUCT (PRD_DESCRIPTION) values(#description#)
5
SELECT SCOPE_IDENTITY() AS ID
]]>
6
</
selectKey
>
7
</
insert
>
![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
2
![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
3
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4
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MySQL配置
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<!--
MySQL Last Insert Id
-->
2
<
insert
id
="insertProduct-Mysql"
parameterClass
="com.domain.Product"
>
3
<![CDATA[
insert into PRODUCT(PRD_DESCRIPTION) values(#description#)
]]>
4
<
selectKey
resultClass
="int"
keyProperty
="id"
>
5
<![CDATA[
SELECT LAST_INSERT_ID() AS ID
]]>
6
<!--
该方法LAST_INSERT_ID()与数据库连接绑定,同属统一会话级别,不会发生上述MS SQL Server的函数问题。
-->
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</
selectKey
>
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</
insert
>
![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
2
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3
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通过以上方式,可以最大程度上确保插入数据的时候获得当前自增主键。