asp.net中连接各种数据库字符串连接程序(mysql/mssql/access)

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Data.Sql;

namespace ado
{
public class ConnectionDemo1
{
public void GetOleDbTable()
{
#region namespace
//using System.Data.OleDb;
#endregion

#region OLEDB Access

//OLEDB
//C#连接Access的方式

//Access 2003 Provider=Microsoft.Jet.OLEDB.4.0
//Access 2007 Provider=Microsoft.Ace.OleDb.12.0

//(1)无数据库密码，无用户密码，共享方式打开
//"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;"
//(2)有数据库密码，没有用户密码,这种方式以独占方式打开
//"Provider=Microsoft.Jet.OleDB.4.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;Jet OleDb:DataBase Password=123"
//(3)有数据库密码，有用户密码 可以用该方法,但用户密码处就算设有密码也必须为空，这种方式以独占方式打开
//"Provider=Microsoft.Jet.OleDB.4.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;Jet OleDb:DataBase Password=12345;Persist Security Info=true;password=;user id=Admin"

#endregion

#region OLEDB MSSQL

//OLEDB
//C#连接MSSQL的方式

//Windows 身份验证
//"Provider=SQLOLEDB;Data Source=PEK7-6TKX23XSQLEXPRESS;Initial Catalog=Test;Trusted_Connection=Yes;";
//SQL Server 身份验证
//"Provider=SQLOLEDB;Data Source=127.0.0.1SQLEXPRESS;Initial Catalog=Test;User Id=sa;Password=123456;";

#endregion

#region OLEDB Oracle
//OLEDB
//C#连接Oracle的方式

//"Provider=MSDAORA;Data Source=MyDatabaseAlias;User ID=MyUID;Password=MyPassword";
#endregion

//string strConn = @"Provider=Microsoft.Ace.OleDb.12.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;Jet OleDb:DataBase Password=123";//Access 2007
string strConn =
@"Provider=SQLOLEDB;Data Source=127.0.0.1SQLEXPRESS;Initial Catalog=Test;User Id=sa;Password=123456;";
OleDbConnection conn = new OleDbConnection(strConn);
OleDbCommand comm = new OleDbCommand();

comm.CommandText = "SELECT * FROM Users";
comm.CommandType = CommandType.Text;
comm.Connection = conn;
if (conn.State != ConnectionState.Open)
{
conn.Open();
DataSet ds = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter(comm);
da.Fill(ds);
conn.Close();
}
}

public void GetSqlConnectionTable()
{
#region namespace
//using System.Data.SqlClient;
#endregion

#region MSSQL SqlConnection
//SqlConnection
//C#连接MSSQL的方式

//Windows 身份验证
//"Data Source=PEK7-6TKX23XSQLEXPRESS;Initial Catalog=Test;Trusted_Connection=Yes;";
//SQL Server 身份验证
//"server=127.0.0.1SQLEXPRESS;database=Test;Uid=sa;PassWord=123456";
#endregion

//string strConn = @"server=127.0.0.1SQLEXPRESS;database=Test;Uid=sa;PassWord=123456";
string strConn = @"Data Source=PEK7-6TKX23XSQLEXPRESS;Initial Catalog=Test;Trusted_Connection=Yes;";

SqlConnection conn = new SqlConnection(strConn);
SqlCommand comm = new SqlCommand();
comm.CommandText = "SELECT * FROM Users";
comm.CommandType = CommandType.Text;
comm.Connection = conn;

if(conn.State!=ConnectionState.Open)
{
conn.Open();
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(comm);
da.Fill(ds);
conn.Close();
}

}
}
}

//OLEDB
//C#连接Access的方式

//Access 2003 Provider=Microsoft.Jet.OLEDB.4.0
//Access 2007 Provider=Microsoft.Ace.OleDb.12.0

//(1)无数据库密码，无用户密码，共享方式打开
//"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;"
//(2)有数据库密码，没有用户密码,这种方式以独占方式打开
//"Provider=Microsoft.Jet.OleDB.4.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;Jet OleDb:DataBase Password=123"
//(3)有数据库密码，有用户密码 可以用该方法,但用户密码处就算设有密码也必须为空，这种方式以独占方式打开
//"Provider=Microsoft.Jet.OleDB.4.0;Data Source=D:qjx文档GenericDemoDataStudent.accdb;Jet OleDb:DataBase Password=12345;Persist Security Info=true;password=;user id=Admin"