SQL编程:存储过程+事务处理+回滚+数据迁移
最近给学校在做一个.NET网站,名字叫做文正学院过程化成绩录入系统,其中需要用到老用户登陆系统需要从旧系统里将以前存在的数据导入到新数据表中, ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 USE [new_
最近给学校在做一个.NET网站,名字叫做文正学院过程化成绩录入系统,其中需要用到老用户登陆系统需要从旧系统里将以前存在的数据导入到新数据表中,
?
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USE [new_wzjw]
GO
/****** Object: StoredProcedure [dbo].[成绩管理_过程化成绩录入_数据迁移] Script Date: 2014/3/16 22:55:38 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create proc [dbo].[成绩管理_过程化成绩录入_数据迁移]
@kcId jxrw_code/*自定义变量名*/
as
begin
begin try
begin tran
INSERT INTO [web_inputCj_xsxkb]
([xh] ,[xm],[xxxzdm],[xxxzmc],[cjxzdm],[kcid],[lrsj],[manuAdd])
select xh, xm, xxxzdm,xxxzmc, cjxzdm, kcid, lrsj, manualAdd
from web_inputCj_cjb as a where a.kcId = @kcId
and not exists ( select * from web_inputCj_xsxkb as b
where a.xh = b.xh and a.kcId = b.kcid )
commit tran
return 0
end try
begin catch
rollback tran
return 1
end catch

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MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


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