/// <summary>
/// 根据参数创建实例。
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="providerName">数据库驱动的名称。System.Data.SqlClient、System.Data.OleDb 、System.Data.Odbc、System.Data.OracleClient等</param>
/// <returns></returns>
public static DataAccessLibrary CreateDal(string connectionString, string providerName)
{
DataAccessLibrary myDal;
switch (providerName)
{
case "System.Data.SqlClient": //SqlClient "System.Data.SqlClient"
myDal = new SqlClientDal(connectionString, providerName);
break;
default: //OleDb
myDal = new OleDbDal(connectionString, providerName);
break;
case "System.Data.Odbc": //Odbc
myDal = new OdbcDal(connectionString, providerName);
break;
case "System.Data.OracleClient":
myDal = new OracleClientDal(connectionString, providerName);
break;
}
return(myDal);
}
/// <summary>
/// 根据web.config里的默认值实例化
/// </summary>
/// <returns></returns>
public static DataAccessLibrary CreateDal()
{
DataAccessLibrary myDal;
switch (CommonFactory.ProviderName)
{
case "System.Data.SqlClient": //SqlClient "System.Data.SqlClient"
myDal = new SqlClientDal();
break;
default: //OleDb
myDal = new OleDbDal();
break;
case "System.Data.Odbc": //Odbc
myDal = new OdbcDal();
break;
case "System.Data.OracleClient":
myDal = new OracleClientDal();
break;
}
return(myDal);
}
