C#编程访问数据库测试程序

Code

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

namespace CSharpBegining

{

class Program

{

//C#编程访问数据库测试程序

static void Main(string[] args)

{

adpter();

//this.BaseCommand();

}

private static void adpter()

{

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["CSharpBegining.Properties.Settings.ArchivesConnectionString"].ConnectionString);

//conn.Open();

}

private void BaseCommand()

{

SqlConnection conn = new SqlConnection();

//conn.ConnectionString = ConfigurationManager.ConnectionStrings["CSharpBegining.Properties.Settings.ArchivesConnectionString"].ConnectionString;

conn.ConnectionString = "Data Source=wei-pc;Initial Catalog=Archives;Integrated Security=true";

//exec ExecuteReader()

SqlCommand cmdReader = new SqlCommand();

cmdReader.CommandText = "select * from [Transfer]";

cmdReader.Connection = conn;

//exec ExecuteScalar()

//SQL SERVER 不区分大小写，但是个人感觉还是区分比较好，以免出现莫名其妙的问题

SqlCommand cmdCount = new SqlCommand("select count(*) from [user]", conn);

//exec ExecuteNonQuery

SqlCommand cmdNonQ = new SqlCommand("insert into [User] values (007,'fireice','50126',2009/4/1,10)", conn);

//测试CommandType.TableDirect。结果失败。SQL SERVER 2005版本为开发版

//SqlCommand cmdType = new SqlCommand("[User]", conn);

//.Net Framework SqlClient 数据提供程序不支持ommandType 枚举值 512

//cmdType.CommandType = CommandType.TableDirect;

string tableName = "User";

SqlCommand cmdPrt = new SqlCommand("SELECT * FROM [" + tableName + "] WHERE userID=@userID", conn);

cmdPrt.Parameters.Add("@userID", SqlDbType.NVarChar).Value = "7";

////SqlCommand cmdPrt = new SqlCommand("SELECT * FROM [@User] WHERE userID=@userID", conn);

//这种方法行不通，存储过程中也尚未找到解决表名作为参数的办法

////cmdPrt.Parameters.Add("@User", SqlDbType.Structured).Value = "User";

try

{

conn.Open();

//int rowCount = (int)cmdCount.ExecuteScalar();

//int res = cmdNonQ.ExecuteNonQuery();

SqlDataReader rd;

//rd= cmdReader.ExecuteReader();

//rd = cmdType.ExecuteReader();

rd = cmdPrt.ExecuteReader();

while (rd.Read())

{

System.Console.Write(rd[0].ToString() + " ");

System.Console.Write(rd.GetString(1) + " ");

System.Console.Write(rd[2] + " ");

System.Console.Write(rd["loginTimes"] + " ");

System.Console.Write(rd.FieldCount + " "); //列数量

System.Console.WriteLine();

System.Console.WriteLine();

for (int index = 0; index < rd.FieldCount; index++)

{

System.Console.Write(rd[index] + "_");

}

System.Console.WriteLine("\n");

}

}

catch (System.Exception e)

{

System.Console.WriteLine(e.ToString());

}

finally

{

conn.Close();

}

}

}

}