整理sqlserver 级联更新和删除 c#调用存储过程返回值

use master  
go  
IF exists(select 1 from sysdatabases where name='temp')
BEGIN	
	DROP DATABASE temp
END
create database temp
go
use temp
go
--drop table  ProductInfo
create table ProductInfo
(
	ProductId int  primary key ,
	ProductName varchar(20),  	
)
 
create table ProductDetails
(
	id int identity(1,1) primary key,
	num varchar(100) , 
	ProductId int,
	foreign key (ProductId) references ProductInfo(ProductId) on delete cascade on update cascade
)
 
insert ProductInfo values (1,'Think')
insert ProductInfo values(2,'TCL')
insert ProductInfo values(3,'HTC')
 
insert ProductDetails values('T420',1)
insert ProductDetails values('Xo1',1)
insert ProductDetails values('TVoo1',2)
insert ProductDetails values('TPhone',2)
insert ProductDetails values('One',3)
insert ProductDetails values('Buffer',3)

 


alter table 表名
add constraint 外键名
foreign key(字段名) references 主表名(字段名)
on delete cascade --删除
on update cascade --更新

--查看现有数据
select * from ProductInfo
select * from ProductDetails

--更改
update ProductInfo set ProductId=5  where ProductName='Think'
select * from ProductInfo
select * from ProductDetails

--删除
delete from ProductInfo where ProductId=5
select * from ProductInfo
select * from ProductDetails

第一种方法:
C#代码:
protected void btnBack_Click(object sender, EventArgs e)
{
        //调用存储过程
        stringconStr=ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ToString();
        SqlConnection conn = new SqlConnection(conStr);
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "MyProc";
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Connection=conn;
        conn.Open();
        SqlParameter sp = new SqlParameter("@ID", SqlDbType.Int);
        sp.Value = int.Parse("3");
        cmd.Parameters.Add(sp);
 
        //定义输出参数
        SqlParameter returnValue = new SqlParameter("@returnValue", SqlDbType.Int);
        returnValue.Direction = ParameterDirection.ReturnValue;
        cmd.Parameters.Add(returnValue);
        cmd.ExecuteNonQuery();        
        conn.Close();
 
}
存储过程如下:
create procedure MyProc
(
     @ID int
)
as
 
 return 1
 

go
注意,(return)这种方式 只能返加数值类型
 
第二种方法:
protected void btnBack_Click(object sender, EventArgs e)
{
        //调用存储过程
        string conStr = System.Configuration.ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ToString();
        SqlConnection conn = new SqlConnection(conStr);
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "MyProc";
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Connection=conn;
        conn.Open();
        SqlParameter sp = new SqlParameter("@ID", SqlDbType.Int);
        sp.Value = int.Parse("3");
        cmd.Parameters.Add(sp);
 
        //定义输出参数
        sp = new SqlParameter("@outputValue", SqlDbType.NVarChar,50);
        sp.Direction = ParameterDirection.Output;
        cmd.Parameters.Add(sp);
        cmd.ExecuteNonQuery();
        
        conn.Close();
 
    }
 
存储过程如下:
alter procedure MyProc
(
     @ID int,
     @outputValue nvarchar(50) output
 
)
as
 Select @outputValue='aa'
go