一、ORACLE中創(chuàng)建自增的ID字段
1、創(chuàng)建序列
?create *sequence_name* ?increment by 1 start with 1 maxvalue 999999999;
2、創(chuàng)建觸發(fā)器---(創(chuàng)建一個基于該表的before insert 觸發(fā)器，在觸發(fā)器中使用該SEQUENCE)
create or replace trigger *triger_name*
before insert on???????*table_name*
referencing old as old new as new for each row
begin
select? *sequence_name.nextval into :new.id from dual;
end;
例:
??????create sequence FP_FP_SEQ
??????minvalue 1
??????maxvalue 999999999999999999999999999
??????start with 49231
??????increment by 1
??????cache 10;
??????create or replace trigger FP_FP_tig before insert on FP_FP for each row
??????begin
???????select FP_FP_seq.nextval into :new.id from dual;
??????end;
/
二、ORACLE中JOB的應(yīng)用
1、創(chuàng)建存儲過程
create or replace procedure??? *pro_name
as
begin
?insert into agri_exhibition_basecur (messid,title,type,pub_date)?? select id,title,sort,pub_date from agri_message? where??? (trunc(sysdate-pub_date)=0 and rownum<6) and sort='供' ;
?insert into agri_exhibition_basecur (messid,title,type,pub_date)?? select id,title,sort,pub_date from agri_message? where??? (trunc(sysdate-pub_date)=0 and rownum<6) and sort='求' ;
end;
/
2、創(chuàng)建JOB
variable jobdxm number;
begin
dbms_job.submit(:jobdxm,'exhi_pro_dxm;',sysdate,'trunc(sysdate,''dd'')+32.5/24');
end;
三、收集的一個簡單的JOB實列
1、創(chuàng)建測試表
SQL> create table a(a date);
表已創(chuàng)建。
2、創(chuàng)建一個自定義過程
SQL> create or replace procedure test as
? 2? begin
? 3? insert into a values(sysdate);
? 4? end;
? 5? /
過程已創(chuàng)建。
3、創(chuàng)建JOB
SQL> variable job1 number;
SQL>
SQL> begin
? 2? dbms_job.submit(:job1,'test;',sysdate,'sysdate+1/1440'); --每天1440分鐘，即一分鐘運行test過程一次
? 3? end;
? 4? /
PL/SQL 過程已成功完成。
4、運行JOB
SQL> begin
? 2? dbms_job.run(:job1);
? 3? end;
? 4? /
PL/SQL 過程已成功完成。
SQL> select to_char(a,'yyyy/mm/dd hh24:mi:ss') 時間 from a;
時間
-------------------
2001/01/07 23:51:21
2001/01/07 23:52:22
2001/01/07 23:53:24
5、刪除JOB
SQL> begin
? 2? dbms_job.remove(:job1);
? 3? end;
? 4? /
PL/SQL 過程已成功完成。
6、一些必要的參數(shù)
修改initsid.ora參數(shù)
job_queue_processes = 4
job_queue_interval = 10
job_queue_keep_connections=true
修改可執(zhí)行作業(yè)個數(shù)為20個
ALTER SYSTEM SET JOB_QUEUE_PROCESSES = 20
修改取消限制模式
ALTER SYSTEM DISABLE RESTRICTED SESSION;
7、兩個必要的表
????? user_jobs及dba_jobs_running
8、相關(guān)的幾個JOB操作
刪除job:dbms_job.remove(jobno);
修改要執(zhí)行的操作:job:dbms_job.what(jobno,what);
修改下次執(zhí)行時間：dbms_job.next_date(job,next_date);
修改間隔時間：dbms_job.interval(job,interval);
停止job:dbms.broken(job,broken,nextdate);
啟動job:dbms_job.run(jobno);