[转] ADO.NET调用存储过程带输出参数或返回值

     CREATE PROCEDURE [dbo].[GetNameById]
      @studentid varchar(),
      @studentname nvarchar() OUTPUT
     AS
     BEGIN
      SELECT @studentname=studentname FROM student
         WHERE studentid=@studentid
      if @@Error<>
       RETURN -
      else
       RETURN
     END  

     using (SqlConnection conn = new SqlConnection(connStr))
     {
         try
         {
             SqlCommand cmd = new SqlCommand("GetNameById", conn);
             cmd.CommandType = CommandType.StoredProcedure;
             cmd.Parameters.AddWithValue("@studentid", "");　　//给输入参数赋值
             SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, );　　//定义输出参数
             parOutput.Direction = ParameterDirection.Output;　　//参数类型为Output
             SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
             parReturn.Direction = ParameterDirection.ReturnValue; 　　//参数类型为ReturnValue
             cmd.Parameters.Add(parReturn);
             conn.Open();
             cmd.ExecuteNonQuery();
             MessageBox.Show(parOutput.Value.ToString());   //显示输出参数的值
             MessageBox.Show(parReturn.Value.ToString());　　//显示返回值
         }
         catch (System.Exception ex)
         {
             MessageBox.Show(ex.Message);
         }
     }  

     Create PROCEDURE AddOrderTran
         @country nvarchar(),
         @adds nvarchar(),
         @ynames nvarchar(),
         @pids nvarchar(),
         @cellp nvarchar(),
         @cphone nvarchar(),
         @amounts nvarchar(),
         @cartnumber nvarchar()
     as
         Declare @id int
         BEGIN TRANSACTION
             insert into Orders(Order_Country,Order_Adress,Order_UserName,Order_PostID,Cells,Order_Phone,Total_pay,CartNumber,IsPay)
                 values (@country,@adds,@ynames,@pids,@cellp,@cphone,@amounts,@cartnumber,'')
             Select @id=@@identity
             insert into Orders_Item (OrderNumber,ProductsID,Products_Color,Products_Price,Order_Qty,Item_Total)
                 select  @id,Carts_Item.ProductsID,Carts_Item.Products_Color,Carts_Item.Products_Price,Carts_Item.Item_Qty,Carts_Item.Total_Pay
                 from Carts_Item where Carts_Item.CartNumber=@cartnumber
             delete Carts_Item where CartNumber=@cartnumber
             IF @@error <>   --发生错误
             BEGIN
                 ROLLBACK TRANSACTION
                 RETURN
             END
             ELSE
             BEGIN
                 COMMIT TRANSACTION
                 RETURN @id    --执行成功
         END  

             #region 执行存储过程  

             SqlParameter[] param = new SqlParameter[]
               {
                   new SqlParameter("@country",country),
                   new SqlParameter("@adds",adds),
                   new SqlParameter("@ynames",ynames),
                   new SqlParameter("@pids", pids),
                   new SqlParameter("@cellp",cellp),
                   new SqlParameter("@cphone", cphone),
                   new SqlParameter("@amounts",amounts),
                   new SqlParameter("@cartnumber",cartnumber),
                   new SqlParameter("@return",SqlDbType.Int)
               };
             param[].Direction = ParameterDirection.ReturnValue;
             MSCL.SqlHelper.RunProcedure("AddOrderTran", param);
             object obj = param[].Value; //接受返回值  

             //string connStr = System.Configuration.ConfigurationManager.AppSettings["ConStr"].ToString();
             //using (SqlConnection conn = new SqlConnection(connStr))
             //{
             //    conn.Open();
             //    SqlCommand cmd = new SqlCommand("AddOrderTran", conn);
             //    cmd.CommandType = CommandType.StoredProcedure;  

             //    SqlParameter para1 = new SqlParameter("@country", country);
             //    para1.Direction = ParameterDirection.Input;  //参数方向 为输入参数
             //    cmd.Parameters.Add(para1);  

             //    SqlParameter para2 = new SqlParameter("@adds", adds);
             //    para2.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para2);  

             //    SqlParameter para3 = new SqlParameter("@ynames", ynames);
             //    para3.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para3);  

             //    SqlParameter para4 = new SqlParameter("@pids", pids);
             //    para4.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para4);  

             //    SqlParameter para5 = new SqlParameter("@cellp", cellp);
             //    para5.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para5);  

             //    SqlParameter para6 = new SqlParameter("@cphone", cphone);
             //    para6.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para6);  

             //    SqlParameter para7 = new SqlParameter("@amounts", amounts);
             //    para7.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para7);  

             //    SqlParameter para8 = new SqlParameter("@cartnumber", cartnumber);
             //    para8.Direction = ParameterDirection.Input;
             //    cmd.Parameters.Add(para8);  

             //    SqlParameter paraReturn = new SqlParameter("@return", SqlDbType.Int);
             //    paraReturn.Direction = ParameterDirection.ReturnValue;  //参数方向 为返回参数
             //    cmd.Parameters.Add(paraReturn);  

             //    cmd.ExecuteNonQuery();  

             //    object obj = paraReturn;
             //    if (obj.ToString() == "0")
             //    {
             //        //存储过程执行失败
             //    }
             //    else
             //    {
             //        //成功
             //    }
             //}
             //#endregion  

     本文的数据库用的是sql server自带数据Northwind   

     .只返回单一记录集的存储过程  

     SqlConnection sqlconn = new SqlConnection(conn);
     SqlCommand cmd = new SqlCommand();
     // 设置sql连接
     cmd.Connection = sqlconn;
     // 如果执行语句
     cmd.CommandText = "Categoriestest1";
     // 指定执行语句为存储过程
     cmd.CommandType = CommandType.StoredProcedure;  

     SqlDataAdapter dp = new SqlDataAdapter(cmd);
     DataSet ds = new DataSet();
     // 填充dataset
     dp.Fill(ds);
     // 以下是显示效果
     GridView1.DataSource = ds;
     GridView1.DataBind();  

     存储过程Categoriestest1
     CREATE PROCEDURE Categoriestest1
      AS
      select *
      from  Categories
      GO  

     . 没有输入输出的存储过程
     SqlConnection sqlconn = new SqlConnection(conn);
     SqlCommand cmd = new SqlCommand();  

     cmd.Connection = sqlconn;
     cmd.CommandText = "Categoriestest2";
     cmd.CommandType = CommandType.StoredProcedure;
     sqlconn.Open();
     // 执行并显示影响行数
     Label1.Text = cmd.ExecuteNonQuery().ToString();
     sqlconn.Close();  

     存储过程Categoriestest2  

     CREATE PROCEDURE Categoriestest2  AS
      insert into dbo.Categories
      (CategoryName,[Description],[Picture])
      values ('test1','test1',null)
      GO  

     . 有返回值的存储过程
     SqlConnection sqlconn = new SqlConnection(conn);
              SqlCommand cmd = new SqlCommand();
              cmd.Connection = sqlconn;
              cmd.CommandText = "Categoriestest3";
              cmd.CommandType = CommandType.StoredProcedure;
              // 创建参数
             IDataParameter[] parameters = {
                      new SqlParameter("rval", SqlDbType.Int,)
                  };
              // 将参数类型设置为 返回值类型
             parameters[].Direction = ParameterDirection.ReturnValue;
              // 添加参数
             cmd.Parameters.Add(parameters[]);  

              sqlconn.Open();
              // 执行存储过程并返回影响的行数
             Label1.Text = cmd.ExecuteNonQuery().ToString();
              sqlconn.Close();
              // 显示影响的行数和返回值
             Label1.Text += "-" + parameters[].Value.ToString() ;  

     存储过程Categoriestest3  

     CREATE PROCEDURE Categoriestest3
      AS
      insert into dbo.Categories
      (CategoryName,[Description],[Picture])
      values ('test1','test1',null)
     return @@rowcount
      GO  

     . 有输入参数和输出参数的存储过程  

      SqlConnection sqlconn = new SqlConnection(conn);
              SqlCommand cmd = new SqlCommand();
              cmd.Connection = sqlconn;
              cmd.CommandText = "Categoriestest4";
              cmd.CommandType = CommandType.StoredProcedure;
              // 创建参数
             IDataParameter[] parameters = {
                      new SqlParameter("@Id", SqlDbType.Int,) ,
                      new SqlParameter("@CategoryName", SqlDbType.NVarChar,) ,
                  };
              // 设置参数类型
             parameters[].Direction = ParameterDirection.Output;  // 设置为输出参数
             parameters[].Value = "testCategoryName";
              // 添加参数
             cmd.Parameters.Add(parameters[]);
              cmd.Parameters.Add(parameters[]);  

              sqlconn.Open();
              // 执行存储过程并返回影响的行数
             Label1.Text = cmd.ExecuteNonQuery().ToString();
              sqlconn.Close();
              // 显示影响的行数和输出参数
             Label1.Text += "-" + parameters[].Value.ToString() ;  

     存储过程Categoriestest4        

     CREATE PROCEDURE Categoriestest4
      @id int output,
      @CategoryName nvarchar()
      AS
      insert into dbo.Categories
      (CategoryName,[Description],[Picture])
      values (@CategoryName,'test1',null)
     set  @id = @@IDENTITY
      GO  

     . 同时具有返回值、输入参数、输出参数的存储过程  

      SqlConnection sqlconn = new SqlConnection(conn);
              SqlCommand cmd = new SqlCommand();
              cmd.Connection = sqlconn;
              cmd.CommandText = "Categoriestest5";
              cmd.CommandType = CommandType.StoredProcedure;
              // 创建参数
             IDataParameter[] parameters = {
                      new SqlParameter("@Id", SqlDbType.Int,) ,
                      new SqlParameter("@CategoryName", SqlDbType.NVarChar,) ,
                      new SqlParameter("rval", SqlDbType.Int,)
                  };
              // 设置参数类型
             parameters[].Direction = ParameterDirection.Output;       // 设置为输出参数
             parameters[].Value = "testCategoryName";                  // 给输入参数赋值
             parameters[].Direction = ParameterDirection.ReturnValue;  // 设置为返回值
             // 添加参数
             cmd.Parameters.Add(parameters[]);
              cmd.Parameters.Add(parameters[]);
              cmd.Parameters.Add(parameters[]);  

              sqlconn.Open();
              // 执行存储过程并返回影响的行数
             Label1.Text = cmd.ExecuteNonQuery().ToString();
              sqlconn.Close();
              // 显示影响的行数，输出参数和返回值
             Label1.Text += "-" + parameters[].Value.ToString() + "-" + parameters[].Value.ToString();  

      存储过程Categoriestest5  

     CREATE PROCEDURE Categoriestest5
      @id int output,
      @CategoryName nvarchar()
      AS
      insert into dbo.Categories
      (CategoryName,[Description],[Picture])
      values (@CategoryName,'test1',null)
     set  @id = @@IDENTITY
     return @@rowcount
      GO  

      . 同时返回参数和记录集的存储过程
         SqlConnection sqlconn = new SqlConnection(conn);
         SqlCommand cmd = new SqlCommand();
         cmd.Connection = sqlconn;
         cmd.CommandText = "Categoriestest6";
         cmd.CommandType = CommandType.StoredProcedure;
              // 创建参数
             IDataParameter[] parameters = {
                      new SqlParameter("@Id", SqlDbType.Int,) ,
                      new SqlParameter("@CategoryName", SqlDbType.NVarChar,) ,
                      new SqlParameter("rval", SqlDbType.Int,)                   // 返回值
                 };
              // 设置参数类型
         parameters[].Direction = ParameterDirection.Output;        // 设置为输出参数
         parameters[].Value = "testCategoryName";                   // 给输入参数赋值
         parameters[].Direction = ParameterDirection.ReturnValue;   // 设置为返回值
         // 添加参数
         cmd.Parameters.Add(parameters[]);
         cmd.Parameters.Add(parameters[]);
         cmd.Parameters.Add(parameters[]);  

         SqlDataAdapter dp = new SqlDataAdapter(cmd);
         DataSet ds = new DataSet();
         // 填充dataset
         dp.Fill(ds);
         // 显示结果集
         GridView1.DataSource = ds.Tables[];
         GridView1.DataBind();  

         Label1.Text = "";
         // 显示输出参数和返回值
         Label1.Text +=  parameters[].Value.ToString() + "-" + parameters[].Value.ToString();  

     存储过程Categoriestest6  

     CREATE PROCEDURE Categoriestest6
      @id int output,
      @CategoryName nvarchar()
      AS
      insert into dbo.Categories
      (CategoryName,[Description],[Picture])
      values (@CategoryName,'test1',null)
     set  @id = @@IDENTITY
      select * from Categories
     return @@rowcount
      GO  

     . 返回多个记录集的存储过程  

     SqlConnection sqlconn = new SqlConnection(conn);
     SqlCommand cmd = new SqlCommand();  

     cmd.Connection = sqlconn;
     cmd.CommandText = "Categoriestest7";
     cmd.CommandType = CommandType.StoredProcedure;  

     SqlDataAdapter dp = new SqlDataAdapter(cmd);
     DataSet ds = new DataSet();
     // 填充dataset
     dp.Fill(ds);
     // 显示结果集1
     GridView1.DataSource = ds.Tables[];
     GridView1.DataBind();
     // 显示结果集2
     GridView2.DataSource = ds.Tables[];
     GridView2.DataBind();  

     存储过程Categoriestest7  

     CREATE PROCEDURE Categoriestest7
      AS
      select * from Categories
      select * from Categories
      GO