C#连接数据库的方法有哪些

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一、Oracle

查询

    public static DataTable QueryData()    {        DataTable dtResult = new DataTable();        try        {            using (OracleConnection oc = new OracleConnection(HttpContext.Current.Session["DBName"].ToString().Trim()))            {                oc.Open();                string sql = @" SELECT * FROM DUAL";                OracleDataAdapter oaCmd = new OracleDataAdapter(sql, oc);                //oaCmd.SelectCommand.Parameters.Add("fDate", OracleType.VarChar, 50).Value = DateTime.Now.ToString("yyyy/MM/dd") + " " + "00:00:00";                //oaCmd.SelectCommand.Parameters.Add("eDate", OracleType.VarChar, 50).Value = DateTime.Now.ToString("yyyy/MM/dd") + " " + "23:59:59";                oaCmd.Fill(dtResult);                oc.Close();            }        }        catch (Exception ex)        {                    }        return dtResult;    }

更新

    public static void DoInser(string login_user, string login_db)    {        try        {            //string strDBXMLFile = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath.ToString()) + @"\DB.XML";            //DataSet dsXML = new DataSet();            //dsXML.ReadXml(strDBXMLFile);            //DataTable dtAEPDB = dsXML.Tables["DB_NAME"];            //DB 链接            string s = "Data Source=(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = ip地址 )(PORT =端口)))(CONNECT_DATA = (SID=SID号)(SERVER = DEDICATED)));uid = 用户名; password=密码;Connection Lifetime=60;Max Pool Size=50;Min Pool Size=0;Pooling=true";            using (OracleConnection oc = new OracleConnection(s))            {                oc.Open();                string sql = @" INSERT INTO 表名  (栏位1, 栏位2, 栏位3,....)VALUES  (栏位1值, 栏位2值, 栏位3值, ....)";                OracleCommand oaCmd = new OracleCommand(sql, oc);                //oaCmd.Parameters.Add("参数", OracleType.VarChar, 30).Value = "";                oaCmd.CommandType = CommandType.Text;                oaCmd.ExecuteNonQuery();                oc.Close();            }        }        catch (Exception ex)        {                   }    }

二、SQLServer

查询

    public static DataTable QueryData()    {        DataTable dtResult = new DataTable();        try        {            using (SqlConnection sqlConnection = new SqlConnection(HttpContext.Current.Session["DBName"].ToString().Trim()))            {                sqlConnection.Open();                string sql = @" SELECT * FROM DUAL";                SqlDataAdapter sqlDa = new SqlDataAdapter(sql, sqlConnection);                sqlDa.SelectCommand.Parameters.Add("fDate", SqlDbType.VarChar, 50).Value = DateTime.Now.ToString("yyyy/MM/dd") + " " + "00:00:00";                sqlDa.SelectCommand.Parameters.Add("eDate", SqlDbType.VarChar, 50).Value = DateTime.Now.ToString("yyyy/MM/dd") + " " + "23:59:59";                sqlDa.Fill(dtResult);                sqlConnection.Close();            }        }        catch (Exception ex)        {                    }        return dtResult;    }

更新

    public static void DoInser(string login_user, string login_db)    {        try        {            string s = "数据库链接";            using (SqlConnection sqlConnection = new SqlConnection(s))            {                sqlConnection.Open();                string sql = @" INSERT INTO 表名  (栏位1, 栏位2, 栏位3,....)VALUES  (栏位1值, 栏位2值, 栏位3值, ....)";                SqlDataAdapter sqlDa = new SqlDataAdapter(sql, sqlConnection);                sqlDa.InsertCommand.Parameters.Add("参数", SqlDbType.VarChar, 30).Value = "";                SqlCommand cmd = new SqlCommand();                cmd.CommandType = CommandType.Text;                cmd.ExecuteNonQuery();                sqlConnection.Close();            }        }        catch (Exception ex)        {                   }    }

工具类

    public DataTable ExecuteQuery(string sqlStr)      //用于查询；其实是相当于提供一个可以传参的函数，到时候写一个sql语句，存在string里，传给这个函数，就会自动执行。    {        SqlConnection con = new SqlConnection("MySqlCon");        con.Open();        SqlCommand cmd = new SqlCommand();        cmd.Connection = con;        cmd.CommandType = CommandType.Text;        cmd.CommandText = sqlStr;        DataTable dt = new DataTable();        SqlDataAdapter msda;        msda = new SqlDataAdapter(cmd);        msda.Fill(dt);        con.Close();        return dt;    }    public int ExecuteUpdate(string sqlStr)      //用于增删改;    {        SqlConnection con = new SqlConnection("MySqlCon");        con.Open();        SqlCommand cmd = new SqlCommand();        cmd.Connection = con;        cmd.CommandType = CommandType.Text;        cmd.CommandText = sqlStr;        int iud = 0;        iud = cmd.ExecuteNonQuery();        con.Close();        return iud;    }

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