ADO.NET中调用存储过程

下面这个例子展示如何在ADO.NET调用存储过程。我只选择了一种方式，说实话不太喜欢多样化的方式去处理问题，这种发散式的做法在编程中似乎没有必要。选择自己喜欢的一种方式。

这里SQL Server有一个样本数据库Northwind.

以Northwind里的Region表为例：

Region表有2个字段：

• RegionID, int 主键
• RegionDescription, nchar(50)

写以下几个存储过程：

RegionUpdate: 多个参数

CREATE PROCEDURE RegionUpdate(@RegionID INTEGER, @RegionDescription NCHAR(50))

AS

SET NOCOUNT OFF

UPDATE Region

SET RegionDescription = @RegionDescription

WHERE RegionID = @RegionID

GO

RegionDelete 一个参数

CREATE PROCEDURE RegionUpdate(@RegionID INTEGER)

AS

SET NOCOUNT OFF

DELETE FROM Region

WHERE RegionID = @RegionID

GO

RegionInsert 带返回参数

CREATE PROCEDURE RegionInsert(@RegionDescription NCHAR(50), @RegionID INTEGER OUTPUT)

AS

SET NOCOUNT OFF

SELECT @RegionID = MAX(RegionID) + 1 

FROM Region

INSERT INTO Region VALUES(@RegionID, @RegionDescription)

GO

 

工程添加下面的配置文件

App.confi

 

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <connectionStrings>

    <add name="Northwind"

         providerName ="System.Data.SqlClient"

         connectionString ="server=(local); integrated security = SSPI;

         database = Northwind" />

  </connectionStrings>

</configuration>

关于连接字符串怎么写参考：

http://www.connectionstrings.com

下面是C# code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.Configuration;

using System.Data.SqlClient;





namespace SQLProcedureDemo

{

    class Program

    {

        private static string GetConnectionStringsConfig(string connectionName)

        {

            string connectionString = ConfigurationManager.ConnectionStrings[connectionName].ConnectionString.ToString();

            Console.WriteLine(connectionString);

            return connectionString;

        }





        static void Main(string[] args)

        {

            string source = GetConnectionStringsConfig("Northwind");



            try

            {

                using (SqlConnection conn = new SqlConnection(source))

                {

                    conn.Open();



                    // Invoke RegionUpdate Procedure

                    SqlCommand cmd = new SqlCommand("RegionUpdate", conn);

                    cmd.CommandType = CommandType.StoredProcedure;

                    SqlParameter updatepara1 = new SqlParameter("@RegionID", SqlDbType.Int);

                    updatepara1.Value = 3;

                    cmd.Parameters.Add(updatepara1);

                    SqlParameter updatepara2 = new SqlParameter("@RegionDescription", SqlDbType.NChar);

                    updatepara2.Value = "Northern";

                    cmd.Parameters.Add(updatepara2);



                    // You can also use the following statement

                    //cmd.Parameters.AddWithValue("@RegionID", 3);

                    //cmd.Parameters.AddWithValue("@RegionDescription", "Northern");



                    cmd.ExecuteNonQuery();



                    // Invoke RegionDelete Procedure                    

                    SqlCommand cmdDel = new SqlCommand("RegionDelete", conn);

                    cmdDel.CommandType = CommandType.StoredProcedure;

                    SqlParameter myParameter = new SqlParameter("@RegionID", SqlDbType.Int);

                    myParameter.Value =5;

                    cmdDel.Parameters.Add(myParameter);

                    cmdDel.ExecuteNonQuery();

                    



                    // Invoke RegionInsert Procedure

                    SqlCommand cmdInsert = new SqlCommand("RegionInsert", conn);

                    cmdInsert.CommandType = CommandType.StoredProcedure;

                    

                    SqlParameter para1 = new SqlParameter("@RegionDescription", SqlDbType.NChar);

                    para1.Value = "South West";

                    cmdInsert.Parameters.Add(para1);



                    SqlParameter para2 = new SqlParameter("@RegionID", SqlDbType.Int);

                    para2.Direction = ParameterDirection.Output;

                    cmdInsert.Parameters.Add(para2);



                    cmdInsert.ExecuteNonQuery();



                    int newRegionID = (int)cmdInsert.Parameters["@RegionID"].Value;

                    Console.WriteLine(newRegionID);                    

                    conn.Close();

                }

            }

            catch (SqlException ex)

            {

                //



                Console.WriteLine(ex.Message);

 

            }



            Console.ReadKey();

        }

    }

}