public BaseDataProvider(EnumDataProviderType?emProvider)
{
if (emProvider == null)
{
throw new CustomException("数据库枚举未赋值");
}
_emProvider = emProvider.Value;
}
/// <summary>
/// Constructs a data access layer data provider.
/// </summary>
public static DataProviderBaseClass GetDataProvider(EnumDataProviderType dataProviderType, string connectionString)
{
// construct specific data access provider class
switch (dataProviderType)
{
case EnumDataProviderType.Access:
case EnumDataProviderType.OleDb:
return(new OleDbDataAccessLayer(connectionString));
case EnumDataProviderType.Odbc:
return(new OdbcDataAccessLayer(connectionString));
case EnumDataProviderType.Oracle:
return(new OracleDataAccessLayer(connectionString));
case EnumDataProviderType.SqlClient:
return(new SqlDataAccessLayer(connectionString));
default:
throw new ArgumentException("Invalid data access layer provider type.");
}
}
public TestDbProvider(EnumDataProviderType emProvider = EnumDataProviderType.TestDb) : base(emProvider)
{
}
/// <summary>
/// Constructs a data access layer based on caller specific data provider.
/// Caller of this method must provide the database connection string through ConnectionString property.
/// </summary>
public static DataProviderBaseClass GetDataProvider(EnumDataProviderType dataProviderType)
{
return(GetDataProvider(dataProviderType, null));
}
/// <summary>
/// Constructs a data access layer based on caller specific data provider.
/// Caller of this method must provide the database connection string through ConnectionString property.
/// </summary>
public static DataProviderBaseClass GetDataProvider(EnumDataProviderType dataProviderType)
{
return GetDataProvider(dataProviderType, null);
}
/// <summary>
/// Constructs a data access layer data provider.
/// </summary>
public static DataProviderBaseClass GetDataProvider(EnumDataProviderType dataProviderType, string connectionString)
{
// construct specific data access provider class
switch (dataProviderType)
{
case EnumDataProviderType.Access:
case EnumDataProviderType.OleDb:
return new OleDbDataAccessLayer(connectionString);
case EnumDataProviderType.Odbc:
return new OdbcDataAccessLayer(connectionString);
case EnumDataProviderType.Oracle:
return new OracleDataAccessLayer(connectionString);
case EnumDataProviderType.SqlClient:
return new SqlDataAccessLayer(connectionString);
default:
throw new ArgumentException("Invalid data access layer provider type.");
}
}
public PmhMallDataProvider(EnumDataProviderType emProvider = EnumDataProviderType.PmhMall) : base(emProvider)
{
}
public PmhMobileDataProvider(EnumDataProviderType emProvider = EnumDataProviderType.PmhMobile) : base(emProvider)
{
}
