sqlserver级联更新和删除c#调用存储过程返回值

整理一下级联更新和删除 c#调用返回值

use master  go  IF exists(select 1from sysdatabaseswhere name='temp') BEGIN       DROP DATABASE temp END create database temp go use temp go --drop table  ProductInfo create table ProductInfo (     ProductIdint  primary key ,     ProductName varchar(20),    )    create table ProductDetails (     idint identity(1,1) primary key,     num varchar(100) ,     ProductIdint,     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 deletefrom ProductInfowhere 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 (      @IDint ) 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 (      @IDint,      @outputValue nvarchar(50) output    ) as  Select @outputValue='aa' go