oracle中主键自增设置

create table dectuser(

           userid integer primary key,  /*主键，自动增加*/

           name varchar2(20),

           sex varchar2(2)

           );2、创建自动增长序列

      drop sequence dectuser_tb_seq;

      create sequence dectuser_tb_seq minvalue 1 maxvalue 99999999

               increment by 1

               start with 1;   /*步长为1*/

 

<insert id="insert" parameterClass="cn.javass.spring.chapter7.UserModel"> 
    <selectKey resultClass="int" type="pre" keyProperty="id" > 
         SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL 
    </selectKey> 
     insert into test (id,name) values (#irrd#,#myName#) 
</insert>

 

在进行数据的插入时，有的业务需要获得相应的生成的主键值，以下是ibatis的实现方式：
有些数据库是预生成(pre-generate)主键的，如Oracle和PostgreSQL；有些是后生成(post-generate)主键的，如MySQL和SQL Server。不管是哪种方式，都可以用iBATIS的<selectkey>节点来获取<insert>语句所产生的主键。

demo如下：

xml 代码

<!-- Oracle SEQUENCE Example using .NET 1.1 System.Data.OracleClient -->
<insert id="insertProduct-ORACLE" parameterClass="product">
    <selectKey resultClass="int" type="pre" keyProperty="id" >
         SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL
    </selectKey>
     insert into PRODUCT (PRD_ID,PRD_DESCRIPTION) values (#id#,#description#)
</insert>

<!-- Microsoft SQL Server IDENTITY Column Example -->
<insert id="insertProduct-MS-SQL" parameterClass="product">
     insert into PRODUCT (PRD_DESCRIPTION)
     values (#description#)
    <selectKey resultClass="int" type="post" keyProperty="id" >
         select @@IDENTITY as value
    </selectKey>
</insert>

<!-- MySQL Example -->
<insert id="insertProduct-MYSQL" parameterClass="product">
     insert into PRODUCT (PRD_DESCRIPTION)
     values (#description#)
    <selectKey resultClass="int" type="post" keyProperty="id" >
         select LAST_INSERT_ID() as value
    </selectKey>
</insert>