步步为营 .NET三层架构解析 二、数据库设计
要开发用户管理系统,我们首先要了解需求,现在就举一个简单需求,用户表,假设有两种角色用一个字段departID来判断,管理员和员工,
我们要先建一个用户表custom和一个部门表department:
CREATE TABLE [dbo].[custom]([id] [ int ] IDENTITY(1,1) NOT NULL,
[cname] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NOT NULL,
[departID] [ int ] NOT NULL,
[age] [ int ] NOT NULL,
[ename] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NOT NULL,
[password] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NOT NULL,
CONSTRAINT [PK_custom] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY];
CREATE TABLE [dbo].[department](
[id] [ int ] IDENTITY(1,1) NOT NULL,
[departname] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NOT NULL,
[description] [nchar](10) COLLATE Chinese_PRC_CI_AS NOT NULL,
CONSTRAINT [PK_department] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
建完数据库表后,开始写存储过程,插入一条数据:
CREATE PROCEDURE [dbo].[spInsertCustom]
@cname nvarchar(50),
@ename nvarchar(50),
@age int ,
@departID int ,
@password nvarchar(50)
AS
BEGIN
insert into custom(cname,departID,age,ename,password) values (@cname,@departID,@age,@ename,@password)
END
RETURN @@Identity
create PROCEDURE [dbo].[spInsertDepartment]
@departname nvarchar(50),
@description nvarchar(50)
AS
BEGIN
insert into department(departname,description)values(@departname,@description)
END
RETURN @@Identity
现建两个更新一条数据的存储过程:
CREATE PROCEDURE [dbo].[spupdatecustom]@id int ,
@cname nvarchar(50),
@departID int ,
@age int ,
@ename nvarchar(50),
@password nvarchar(50)
AS
BEGIN
update
custom
set
cname = @cname,
departID = @departID,
age = @age,
ename = @ename,
password = @password
where id = @id
END
COMMIT TRAN
create procedure spupdatedepart
(
@departname nvarchar(50),
@description nchar(10),
@id int
)
as
UPDATE [dbo].[department]
SET [departname] = @departname
,[description] = @departname
WHERE id=@id
再新建两个取出所有用户的存储过程:
CREATE PROCEDURE [dbo].[spGetcustom]
AS
BEGIN
select * from custom order by id desc
END
create PROCEDURE [dbo].[spGetAlldepartment]
AS
BEGIN
select * from department
END
再新建一个根据ID取出一条数据的存储过程:
CREATE PROCEDURE [dbo].[spGetcustomer]
@id int
AS
BEGIN
select * from custom where id = @id
END
现建一个根据部门名取部门ID的存储过程:
create PROCEDURE [dbo].[spGetdepartmenter]
@departname nvarchar(50)
AS
BEGIN
select * from department where departname = @departname
END
再建两个根据ID删除数据的存储过程:
create PROCEDURE [dbo].[spDeletecustom]
@id int
AS
BEGIN
delete custom where id = @id
END
CREATE PROCEDURE spdeletedepart
@id int
AS
BEGIN
delete department where id = @id
END
GO
数据库设计就建好了,这只是一个简单的示例.欢迎拍砖.
下次讲解SQLHelper的设计.
作者： Leo_wl
出处： http://www.cnblogs.com/Leo_wl/
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