连接数据库与角色相关简单实现

using System;


using System.Collections.Generic;


using System.Text;


using System.Data;


using System.Data.OleDb;


using System.Runtime.Serialization;


using System.Runtime.Serialization.Formatters.Binary;


using System.Diagnostics;




namespace Common.File




...{


public class DBConnect




...{




public DBConnect() ...{ }




private DBConnectInfo dbc;


private string encryName;


private string encryPwd;




CryptoService cs = new CryptoService();


private void InitRoles()




...{


OleDbConnection con = new OleDbConnection();


string role = cs.Descrypt(encryName);


string pwd = cs.Descrypt(encryPwd);


con.ConnectionString = "Provider=" + dbc.Provider + ";Initial Catalog=" + dbc.Database + ";Password=" + pwd + ";User ID=" + role + ";Data Source=" + dbc.DataSource;




OleDbDataAdapter oda = new OleDbDataAdapter("Select role_id,role_pwd From sys_roles", con);


try




...{


con.Open();


DataSet ds = new DataSet();


oda.Fill(ds, "roles");


foreach (DataRow dr in ds.Tables["roles"].Rows)




...{


}


con.Close();


con.Dispose();


oda.Dispose();




}


catch (System.Exception e)




...{


Debug.Assert(true, e.Message);


}




}


public OleDbConnection OleDbConnection(string loginrole,string as_Database,string as_DataSource)




...{


OleDbConnection dbcon = null;


string role = cs.Descrypt(this.encryName);


string pwd = cs.Descrypt(this.encryPwd);


OleDbConnection con = new OleDbConnection();


string cstr = "Provider=" + dbc.Provider + ";Initial Catalog=" + dbc.Database + ";Password=" + pwd + ";User ID=" + role + ";Data Source=" + dbc.DataSource;


con.ConnectionString = cstr;


string sql = "Select role_pwd From sys_roles Where role_id='" + loginrole + "'";


OleDbCommand cmd = new OleDbCommand(sql, con);


OleDbDataReader reader;


try




...{


con.Open();


reader = cmd.ExecuteReader();


while (reader.Read())




...{


pwd = reader.GetString(0);


pwd = Decrypt(pwd);


break;


}


cstr = "Provider=" + dbc.Provider + ";Initial Catalog=" + dbc.Database + ";Password=" + pwd + ";User ID=" + loginrole + ";Data Source=" + dbc.DataSource;


dbcon = new OleDbConnection(cstr);


}


catch




...{


return null;


}


return dbcon;


}


private string Decrypt(string pwd)




...{


return cs.Descrypt(pwd);


}




}


}



２－－－


using System;


using System.Collections.Generic;


using System.Text;




namespace Common.File




...{


public class DBConnectInfo




...{




Fields#region Fields


private string _provider;


private string _database;


private string _datasource;


private string _role;


#endregion






Properties#region Properties


public string Provider




...{


get




...{


return _provider;


}


set




...{


_provider = value;


}


}


public string Database




...{


get




...{


return _database;


}


set




...{


_database = value;


}


}


public string DataSource




...{


get




...{


return _datasource;


}


set




...{


_datasource = value;


}


}


public string Role




...{


get




...{


return _role;


}


set




...{


_role = value;


}


}


#endregion






Methods#region Methods


#endregion


}


}