1、创建表
<div class=”codetitle”><a style=”CURSOR: pointer” data=”4911″ class=”copybut” id=”copybut4911″ onclick=”doCopy(‘code4911’)”> 代码如下:<div class=”codebody” id=”code4911″>
createtableTest_Increase(
useridnumber(10)NOTNULLprimarykey,/主键，自动增加/
usernamevarchar2(20)
);

2、创建自动增长序列
<div class=”codetitle”><a style=”CURSOR: pointer” data=”96625″ class=”copybut” id=”copybut96625″ onclick=”doCopy(‘code96625’)”> 代码如下:<div class=”codebody” id=”code96625″>
CREATESEQUENCETestIncrease_Sequence
INCREMENTBY1–每次加几个
STARTWITH1–从1开始计数
NOMAXVALUE–不设置最大值，设置最大值：maxvalue9999
NOCYCLE–一直累加，不循环
CACHE10;

3、创建触发器
<div class=”codetitle”><a style=”CURSOR: pointer” data=”74599″ class=”copybut” id=”copybut74599″ onclick=”doCopy(‘code74599’)”> 代码如下:<div class=”codebody” id=”code74599″>
CREATETRIGGERTest_IncreaseBEFORE
insertONTest_IncreaseFOREACHROW/对每一行都检测是否触发/
begin
selectTestIncrease_Sequence.nextvalinto:New.useridfromdual;
end;
//退出sqlplus行编辑/

4、提交
<div class=”codetitle”><a style=”CURSOR: pointer” data=”14120″ class=”copybut” id=”copybut14120″ onclick=”doCopy(‘code14120’)”> 代码如下:<div class=”codebody” id=”code14120″>
commit;

5、测试
insertinto
<div class=”codetitle”><a style=”CURSOR: pointer” data=”95557″ class=”copybut” id=”copybut95557″ onclick=”doCopy(‘code95557’)”> 代码如下:<div class=”codebody” id=”code95557″>
Test_Increase(Username)values(‘test’);