數據庫各類模板

--------------------------------創建視圖-------------------------------------

use StudentManager
go
--判斷視圖是否存在
if exists(select * from sysobjects where name='view_ScoreQuery')
drop view view_ScoreQuery
go
--創建視圖
create view view_ScoreQuery
as
select top 1000 Students.StudentId,StudentName,ClassName,
C#=CSharp,SQLDB=SQLServerDB,
ScoreSum=(CSharp+SQLServerDB) from Students
inner join ScoreList on Students.StudentId=ScoreList.StudentId
inner join StudentClass on Students.ClassId=StudentClass.ClassId
order by StudentClass.ClassId
go
--使用視圖查詢
select * from view_ScoreQuery

-------------------有參存儲過程-------------------
use StudentManager
go
if exists(select * from sysobjects where name='usp_ScoreQuery3')
drop procedure usp_ScoreQuery3
go
--創建帶參數的存儲過程
create procedure usp_ScoreQuery3 
@CSharp int=60,
@DB int=60
as
select Students.StudentId,StudentName,C#=CSharp,DB=SQLServerDB
from Students
inner join ScoreList on Students.StudentId=ScoreList.StudentId
where CSharp<@CSharp or SQLServerDB<@DB
go
--調用帶參數的存儲過程
exec usp_ScoreQuery3 65 --第二個參數沒有賦值，則默認
exec usp_ScoreQuery3 @DB=65
exec usp_ScoreQuery3 default,65 --不使用顯示方式賦值
exec usp_ScoreQuery3 --兩個參數都是用默認參數

---------------------------事務--------------------------

use StudentManager
go
declare @errorSum int --定義變量，用於累計事務執行過程中的錯誤
set @errorSum=0 --初始化為0，即無錯誤
begin transaction
begin	
update CardAccount set CurrentMoney=CurrentMoney-1000
where StudentId=100001
set @errorSum=@errorSum+@@error --累計是否有錯誤	
update CardAccount set CurrentMoney=CurrentMoney+1000
where StudentId=100002
set @errorSum=@errorSum+@@error --累計是否有錯誤
if(@errorSum>0)
rollback transaction
else 
commit transaction
end
go
--查詢余額
select Students.StudentId,StudentName,CurrentMoney from Students
inner join CardAccount on Students.StudentId=CardAccount.StudentId

-------------------------------------創建各類主外鍵-------------------
--創建學員信息數據表
use StudentManager
go
if exists (select * from sysobjects where name='Students')
drop table Students
go
create table Students
(
StudentId int identity(100000,1) ,
StudentName varchar(20) not null,
Gender char(2) not null,
Birthday smalldatetime not null,
StudentIdNo numeric(18,0) not null,--身份證號 
PhoneNumber varchar(50),
StudentAddress varchar(500),
ClassId int not null --班級外鍵
)
go
--創建班級表
if exists(select * from sysobjects where name='StudentClass')
drop table StudentClass
go
create table StudentClass
(
ClassId int primary key,
ClassName varchar(20) not null
)
go
--創建成績表
if exists(select * from sysobjects where name='ScoreList')
drop table ScoreList
go
create table ScoreList
(
id int identity(1,1) primary key,
StudentId int not null,
CSharp int null,
SQLServerDB int null,
UpdateTime smalldatetime not null
)
go
--創建一卡通賬戶表
if exists(select * from sysobjects where name='CardAccount')
drop table CardAccount
go
create table CardAccount
(
StudentId int not null,
CurrentMoney money check(CurrentMoney>1) --當前余額(必須大於1元) 
)
go
--創建管理員用戶表
if exists(select * from sysobjects where name='Admins')
drop table Admins
create table Admins
(
LoginId int identity(1000,1) primary key,
LoginPwd varchar(200) not null,
AdminName varchar(20) not null
)
go
--創建數據表的各種約束
use StudentManager
go
--創建“主鍵”約束primary key
if exists(select * from sysobjects where name='pk_StudentId')
alter table Students drop constraint pk_StudentId

alter table Students
add constraint pk_StudentId primary key (StudentId)


--創建唯一約束unique
if exists(select * from sysobjects where name='uq_StudentIdNo')
alter table Students drop constraint uq_StudentIdNo
alter table Students
add constraint uq_StudentIdNo unique (StudentIdNo)

--創建身份證的長度檢查約束
if exists(select * from sysobjects where name='ck_StudentIdNo')
alter table Students drop constraint ck_StudentIdNo
alter table Students
add constraint ck_StudentIdNo check (len(StudentIdNo)=18)

--創建默認約束
if exists(select * from sysobjects where name='df_StudentAddress')
alter table Students drop constraint df_StudentAddress
alter table Students 
add constraint df_StudentAddress default ('地址不詳' ) for StudentAddress

if exists(select * from sysobjects where name='df_UpdateTime')
alter table ScoreList drop constraint df_UpdateTime
alter table ScoreList 
add constraint df_UpdateTime default (getdate() ) for UpdateTime

--創建外鍵約束
if exists(select * from sysobjects where name='fk_classId')
alter table Students drop constraint fk_classId
alter table Students
add constraint fk_classId foreign key (ClassId) references StudentClass(ClassId)

if exists(select * from sysobjects where name='fk_StudentId')
alter table ScoreList drop constraint fk_StudentId
alter table ScoreList
add constraint fk_StudentId foreign key(StudentId) references Students(StudentId)

if exists(select * from sysobjects where name='fk_CardStudentId')
alter table CardAccount drop constraint fk_CardStudentId
alter table CardAccount
add constraint fk_CardStudentId foreign key(StudentId) references Students(StudentId)