.NET(C#)连接各类数据库-集锦

using System.Data;

using System.Data.OleDb;

..
string strConnection="Provider=Microsoft.Jet.OleDb.4.0;";

strConnection+=@"Data Source=C:BegASPNETNorthwind.mdb";
OleDbConnection objConnection=new OleDbConnection(strConnection);

..
objConnection.Open();

objConnection.Close();

strConnection+="Data Source=";

strConnection+=MapPath("Northwind.mdb");

using System.Data;

using System.Data.SqlClient;

..
string strConnection="user id=sa;password=;";

strConnection+="initial catalog=Northwind;Server=YourSQLServer;";

strConnection+="Connect Timeout=30";
SqlConnection objConnection=new SqlConnection(strConnection);

..
objConnection.Open();

objConnection.Close();

using System.Data.OracleClient;

using System.Data;
//在窗体上添加一个按钮，叫Button1，双击Button1，输入以下代码
private void Button1_Click(object sender, System.EventArgs e)

{

string ConnectionString="Data Source=sky;user=system;password=manager;";//写连接串

OracleConnection conn=new OracleConnection(ConnectionString);//创建一个新连接

try

{conn.Open();

OracleCommand cmd=conn.CreateCommand();

cmd.CommandText="select * from MyTable";//在这儿写sql语句

OracleDataReader odr=cmd.ExecuteReader();//创建一个OracleDateReader对象

while(odr.Read())//读取数据，如果odr.Read()返回为false的话，就说明到记录集的尾部了           
{

Response.Write(odr.GetOracleString(1).ToString());//输出字段1，这个数是字段索引，具体怎么使
用字段名还有待研究

}

odr.Close();

}

catch(Exception ee)

{

Response.Write(ee.Message); //如果有错误，输出错误信息

}

finally

{

conn.Close(); //关闭连接

}

}

using MySQLDriverCS; 
// 建立数据库连接

MySQLConnection DBConn;

DBConn = new MySQLConnection(new MySQLConnectionString
("localhost","mysql","root","",3306).AsString);

DBConn.Open(); 
// 执行查询语句

MySQLCommand DBComm;

DBComm = new MySQLCommand("select Host,User from user",DBConn); 
// 读取数据

MySQLDataReader DBReader = DBComm.ExecuteReaderEx(); 
// 显示数据

try

{

while (DBReader.Read())

{

Console.WriteLine("Host = {0} and User = {1}", 
DBReader.GetString(0),DBReader.GetString(1));

}

}

finally

{

DBReader.Close();

DBConn.Close();

} 
//关闭数据库连接

DBConn.Close();

OleDbConnection1.Open();

//打开数据库连接

OleDbDataAdapter1.Fill(dataSet1,"Address");

//将得来的数据填入dataSet

DataGrid1.DataBind();

//绑定数据

OleDbConnection1.Close();

//关闭连接 
//增加数据库数据

在Web Form上新增对应字段数量个数的TextBox，及一个button，为该按键增加Click响应事件代码如下：
this.OleDbInsertCommand1.CommandText = "INSERTsintosADDRESS(NAME,

EMAIL, AGE, ADDRESS) VALUES

('"+TextBox1.Text+"','"+TextBox2.Text+"','"+TextBox3.Text+"','"+TextBox4.Text+"')";

OleDbInsertCommand1.Connection.Open();

//打开连接

OleDbInsertCommand1.ExecuteNonQuery();

//执行该SQL语句

OleDbInsertCommand1.Connection.Close();

//关闭连接 

Provider=Sybase.ASEOLEDBProvider.2;

Initial Catalog=数据库名;

User ID=用户名;Data Source=数据源;

Extended Properties="";

Server Name=ip地址;

Network Protocol=Winsock;

Server Port Address=5000;