C Calling Stored Procedure Detailed Explanation of With Return Value Parameter Input and Output etc
- 2021-10-13 08:22:57
- OfStack
This article illustrates how C # calls stored procedures. Share it for your reference, as follows:
CREATE PROCEDURE [dbo].[GetNameById]
@studentid varchar(8),
@studentname nvarchar(50) OUTPUT
AS
BEGIN
SELECT @studentname=studentname FROM student
WHERE studentid=@studentid
if @@Error<>0
RETURN -1
else
RETURN 0
END
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Create PROCEDURE AddOrderTran
@country nvarchar(100),
@adds nvarchar(100),
@ynames nvarchar(100),
@pids nvarchar(100),
@cellp nvarchar(100),
@cphone nvarchar(100),
@amounts nvarchar(100),
@cartnumber nvarchar(100)
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,'0')
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 <> 0 -- An error occurred
BEGIN
ROLLBACK TRANSACTION
RETURN 0
END
ELSE
BEGIN
COMMIT TRANSACTION
RETURN @id -- Successful execution
END
#region Execute stored procedures
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[8].Direction = ParameterDirection.ReturnValue;
MSCL.SqlHelper.RunProcedure("AddOrderTran", param);
object obj = param[8].Value; // Accept the return value
//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; // Parameter direction Is an input parameter
// 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; // Parameter direction For the return parameter
// cmd.Parameters.Add(paraReturn);
// cmd.ExecuteNonQuery();
// object obj = paraReturn;
// if (obj.ToString() == "0")
// {
// // Stored procedure execution failed
// }
// else
// {
// // Success
// }
//}
//#endregion
The database in this paper uses sql, server and its own data Northwind
1. Stored procedures that return only single 1 recordsets
SqlConnection sqlconn = new SqlConnection(conn);
SqlCommand cmd = new SqlCommand();
// Settings sql Connect
cmd.Connection = sqlconn;
// If you execute a statement
cmd.CommandText = "Categoriestest1";
// Specify the execution statement as a stored procedure
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter dp = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
// Padding dataset
dp.Fill(ds);
// The following is the display effect
GridView1.DataSource = ds;
GridView1.DataBind();
Stored procedure Categoriestest1
CREATE PROCEDURE Categoriestest1
AS
select *
from Categories
GO
2. Stored procedures without input and output
SqlConnection sqlconn = new SqlConnection(conn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = sqlconn;
cmd.CommandText = "Categoriestest2";
cmd.CommandType = CommandType.StoredProcedure;
sqlconn.Open();
// Execute and display the number of affected rows
Label1.Text = cmd.ExecuteNonQuery().ToString();
sqlconn.Close();
Stored procedure Categoriestest2
CREATE PROCEDURE Categoriestest2 AS
insert into dbo.Categories
(CategoryName,[Description],[Picture])
values ('test1','test1',null)
GO
3. Stored procedures with return values
SqlConnection sqlconn = new SqlConnection(conn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = sqlconn;
cmd.CommandText = "Categoriestest3";
cmd.CommandType = CommandType.StoredProcedure;
// Create Parameters
IDataParameter[] parameters = {
new SqlParameter("rval", SqlDbType.Int,4)
};
// Set the parameter type to Return value type
parameters[0].Direction = ParameterDirection.ReturnValue;
// Add parameters
cmd.Parameters.Add(parameters[0]);
sqlconn.Open();
// Execute the stored procedure and return the number of affected rows
Label1.Text = cmd.ExecuteNonQuery().ToString();
sqlconn.Close();
// Displays the number of affected rows and the return value
Label1.Text += "-" + parameters[0].Value.ToString() ;
Stored procedure Categoriestest3
CREATE PROCEDURE Categoriestest3
AS
insert into dbo.Categories
(CategoryName,[Description],[Picture])
values ('test1','test1',null)
return @@rowcount
GO
4. Stored procedures with input and output parameters
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Stored procedure Categoriestest4
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
5. Stored procedures with return values, input parameters, and output parameters
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Stored procedure Categoriestest5
CREATE PROCEDURE Categoriestest5
@id int output,
@CategoryName nvarchar(15)
AS
insert into dbo.Categories
(CategoryName,[Description],[Picture])
values (@CategoryName,'test1',null)
set @id = @@IDENTITY
return @@rowcount
GO
6. Stored procedures that return both parameters and recordsets
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Stored procedure Categoriestest6
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
7. Stored procedures that return multiple recordsets
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Stored procedure Categoriestest7
using (SqlConnection conn = new SqlConnection(connStr))
{
try
{
SqlCommand cmd = new SqlCommand("GetNameById", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@studentid", "09888888"); // Assign values to input parameters
SqlParameter parOutput =cmd.Parameters.Add("@studentname", SqlDbType.NVarChar, 50); // Define output parameters
parOutput.Direction = ParameterDirection.Output; // Parameter type is Output
SqlParameter parReturn = new SqlParameter("@return", SqlDbType.Int);
parReturn.Direction = ParameterDirection.ReturnValue; // Parameter type is ReturnValue
cmd.Parameters.Add(parReturn);
conn.Open();
cmd.ExecuteNonQuery();
MessageBox.Show(parOutput.Value.ToString()); // Displays the value of the output parameter
MessageBox.Show(parReturn.Value.ToString()); // Display return value
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
For more readers interested in C # related content, please check out the topics on this site: "C # Common Control Usage Tutorial", "WinForm Control Usage Summary", "C # Data Structure and Algorithm Tutorial", "C # Object-Oriented Programming Introduction Tutorial" and "C # Programming Thread Use Skills Summary"
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