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ADO.NET中调用存储过程

2010-07-12 16:29 459 查看

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

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RegionDelete 一个参数

CREATE PROCEDURE RegionUpdate(@RegionID INTEGER)
AS
SET NOCOUNT OFF
DELETE FROM Region
WHERE RegionID = @RegionID
GO

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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

<?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>

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();
}
}
}

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