SqlServer,Access,Oracle连接数据库的方法

1、Access数据库

using System.Data.OleDB;

string conn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=//*.mdb";

OleDbConnection l_Accessconn = New OleDbConnection(conn);

try

{

l_Accessconn.Open();

}

catch(Exception e)

{

throw new Exception(ex.Message);

}

2、SQL Server数据库

using System.Data.SQLClient;

string conn = "Server=**;user id=**;password=**;DataBase=**";

SqlConnection l_Sqlconn = New SqlConnection (conn);

try

{

l_Sqlconn .Open();

}

catch(Exception e)

{

throw new Exception(ex.Message);

}
# - Oracle数据库连接方法
using System;
using System.Data;
using System.Data.OracleClient;

class Sample
{
public static void Main()
{
string myConnString = "user id=zk;data source=zkqx;password=*****";
OracleConnection myConnection = new OracleConnection(myConnString);

OracleCommand catCMD = myConnection.CreateCommand();
catCMD.CommandText = " SELECT CZYDM,CZYMC,CZYMM,CZYQX FROM ZC_CZY ";

myConnection.Open();

OracleDataReader myReader = catCMD.ExecuteReader();

while (myReader.Read())
{
Console.WriteLine("tttt", myReader.GetString(0),myReader.GetString(1),myReader.GetString(2),myReader.GetString(3));
}

myReader.Close();

myConnection.Close();
}
}