多数据之间的连接操作-集中几个.NET常用的方法(不完整)

using System;


using System.Configuration ;


using ASPNETClassLibrary;


using System.Data;


using System.Data.Common;




namespace Study.Command




...{




/**//// <summary>


/// Command 的摘要说明。


/// </summary>


public class Command




...{


public Command()




...{




}






设置连接数据字符串及数据库类型 connectionString AND dataBaseType#region 设置连接数据字符串及数据库类型 connectionString AND dataBaseType




private static string _connectionString = ConfigurationSettings.AppSettings["ConnectionString"].ToString();






/**//// <summary>


/// 获取连接数据


/// </summary>


public static string connectionString




...{




get...{ return _connectionString ; }


}






private static string _dataBaseType = ConfigurationSettings.AppSettings["DataBaseType"].ToString();






/**//// <summary>


/// 得到数据类型


/// </summary>


public static string dataBaseType




...{




get...{ return _dataBaseType;}


}




#endregion connectionString AND dataBaseType






/**//// <summary>


/// 设置连接


/// </summary>


public static void SetConnection()




...{


// "SQL" -- 连接SqlCommand_SQL


// "ODBC" -- 连接到Command_ODBC


// "ORACLE" -- 连接到Command_ORACLE


// "OLEDB" -- 连接到Command_OLEDB


switch(dataBaseType)




...{


case "SQL":


Command_SQL.connectionString = connectionString;


break;


case "ODBC":


Command_ODBC.connectionString = connectionString;


break;


case "ORACLE":


Command_ORACLE.connectionString = connectionString;


break;


case "OLEDB":


Command_OLEDB.connectionString = connectionString;


break;


default:


Command_SQL.connectionString = connectionString;


break;


}//End switch


}








/**//// <summary>


/// 连接数据


/// </summary>


/// <returns></returns>


public static IDbConnection GetConnection()




...{


SetConnection();


IDbConnection cn;


switch(dataBaseType)




...{


case "SQL":


cn = Command_SQL.getSqlConnection();


break;


case "ODBC":


cn = Command_ODBC.getOdbcConnection();


break;


case "ORACLE":


cn = Command_ORACLE.getOracleConnection();


break;


case "OLEDB":


cn = Command_OLEDB.getOleDbConnection();


break;


default:


cn = Command_SQL.getSqlConnection();


break;


}//End switch


return cn;


}








/**//// <summary>


/// 设置Command对象


/// </summary>


/// <returns></returns>


public static IDbCommand GetCommand()




...{


SetConnection();


IDbCommand cmd ;


switch(dataBaseType)




...{


case "SQL":


cmd = Command_SQL.getSqlCommand();


break;


case "ODBC":


cmd = Command_ODBC.getOdbcCommand();


break;


case "ORACLE":


cmd = Command_ORACLE.getOracleCommand();


break;


case "OLEDB":


cmd = Command_OLEDB.getOleDbCommand();


break;


default:


cmd = Command_SQL.getSqlCommand();


break;


}//End switch


return cmd;


}








/**//// <summary>


/// 返回所受影响的行数


/// </summary>


/// <param name="excuteString"></param>


/// <returns></returns>


public static int ExecuteNoeQuery(string executeString)




...{


SetConnection();


int count;


switch(dataBaseType)




...{


case "SQL":


count = Command_SQL.ExecuteNonQuery(executeString);


break;


case "ODBC":


count = Command_ODBC.ExecuteNonQuery(executeString);


break;


case "ORACLE":


count = Command_ORACLE.ExecuteNonQuery(executeString);


break;


case "OLEDB":


count = Command_OLEDB.ExecuteNonQuery(executeString);


break;


default:


count = Command_SQL.ExecuteNonQuery(executeString);


break;


}//End switch


return count;


}








/**//// <summary>


/// 返回首先首列的值


/// </summary>


/// <param name="executeString"></param>


/// <returns></returns>


public static string ExecuteScalar(string executeString)




...{


SetConnection();


string shouHangShouLei;


switch(dataBaseType)




...{


case "SQL":


shouHangShouLei = Command_SQL.ExecuteScalar(executeString);


break;


case "ODBC":


shouHangShouLei = Command_ODBC.ExecuteScalar(executeString);


break;


case "ORACLE":


shouHangShouLei = Command_ORACLE.ExecuteScalar(executeString);


break;


case "OLEDB":


shouHangShouLei = Command_OLEDB.ExecuteScalar(executeString);


break;


default:


shouHangShouLei = Command_SQL.ExecuteScalar(executeString);


break;


}//End switch


return shouHangShouLei;


}








/**//// <summary>


/// 建立一个数据集对象


/// </summary>


/// <param name="executeString"></param>


/// <param name="name"></param>


/// <returns></returns>


public static DataSet GetDataSet(string executeString,string name)




...{


SetConnection();


DataSet dataSet;


switch(dataBaseType)




...{


case "SQL":


dataSet = Command_SQL.getDataSet(executeString,name);


break;


case "ODBC":


dataSet = Command_ODBC.getDataSet(executeString,name);


break;


case "ORACLE":


dataSet = Command_ORACLE.getDataSet(executeString,name);


break;


case "OLEDB":


dataSet = Command_OLEDB.getDataSet(executeString,name);


break;


default:


dataSet = Command_SQL.getDataSet(executeString,name);


break;


}//End switch


return dataSet;


}








/**//// <summary>


/// 建立一个数据集对象


/// </summary>


/// <param name="executeString"></param>


/// <returns></returns>


public static DataSet GetDataSet(string executeString)




...{


SetConnection();


DataSet dataSet;


switch(dataBaseType)




...{


case "SQL":


dataSet = Command_SQL.getDataSet(executeString);


break;


case "ODBC":


dataSet = Command_ODBC.getDataSet(executeString);


break;


case "ORACLE":


dataSet = Command_ORACLE.getDataSet(executeString);


break;


case "OLEDB":


dataSet = Command_OLEDB.getDataSet(executeString);


break;


default:


dataSet = Command_SQL.getDataSet(executeString);


break;


}//End switch


return dataSet;


}








/**//// <summary>


/// 建立一个Table对象


/// </summary>


/// <param name="executeString"></param>


/// <returns></returns>


public static DataTable GetDataTable(string executeString)




...{


SetConnection();


DataTable dataTable;


switch(dataBaseType)




...{


case "SQL":


dataTable = Command_SQL.getDataTable(executeString);


break;


case "ODBC":


dataTable = Command_ODBC.getDataTable(executeString);


break;


case "ORACLE":


dataTable = Command_ORACLE.getDataTable(executeString);


break;


case "OLEDB":


dataTable = Command_OLEDB.getDataTable(executeString);


break;


default:


dataTable = Command_SQL.getDataTable(executeString);


break;


}//End switch


return dataTable;


}




}


}