Oracel--实现自动编号字段
转自http://yxl864.blog.163.com/blog/static/140608558201023001239317/

SQL Server,Sybase:

有identity性可以系自增1

create table a

(

a1 int identity(1,1),

a2 varchar(6)

)

然後在insert:

insert into a values('hello!'); --不用管a1,系你自增1



Oracle:

使用SEQUENCE(序列)可以到你的要求

create table a

(

a1 int ,

a2 varchar2(6)

);

create SEQUENCE seq_a INCREMENT BY 1;



然後在insert:

insert into a values(seq_a.nextval,'hello!'); --seq_a.nextval是序列的下值



代码：

decline_id_sql = "select to_char(S_DECLINE_ID.nextval) DECLINE_ID from DUAL";
try {
dba = new DBAccess(con);
ResultSet rs = dba.openSelect(decline_id_sql);
rs.beforeFirst();
if (rs.next()) {
decline_id = StringUtil.escapeSQLTags((rs
.getString("DECLINE_ID")));
}
declineItemBean.setDecline_id(decline_id);
rs.close();
dba.closeSelect();
} catch (Exception ex) {
}