DAO: It is Microsoft to provide the first attempt for the programmer to provide object-oriented database operations. Its disadvantage is that it is assumed that the data source is on the local machine and cannot be connected to the remote data source. Applications in Access and VB5.0
RDO: (Remote Data Objects) is another object-oriented data access interface for ODBC. It contains methods and objects similar to DAO, but they show more of more ODBC low-level features. Although it doesn't have a well-handed database, it supports other large database Oracle, SQL, etc.
ADO: (ActiveX Data Objiects) Starting is a method that allows ASP access to the database, only supports very basic customer-server data access. Become a replacement of DAO and RDO, with support for disconnecting records, better service enterprise database systems.
ADO.NET: is a new data access technology to optimize individual data providers, suitable for remote data. Handling a large number of applications that users access data simultaneously. Main new things: broken data, XML technology, data provider
