J2EE developers use the data access object (DAO) design mode to separate the underlying data access logic from the high-level business logic, so that the DAO mode can focus more on writing data access code.Let's first review the DAO design mode and
Background:The methods for accessing data vary depending on different data sources. Accessing persistent data sources, such as databases, varies with their storage types (relational databases, object-oriented databases, simple file storage, other
ODBC(Open Database Connectivity, Open Database interconnection)
In 1992, Microsoft's wosa (windows open services architecture), a Database Component, established a set of specifications, it also provides a set of standard APIs for database access
DAO (Database access Object) uses the Microsoft Jet database engine to access the database.
Microsoft Jet provides a data engine for products such as access and Visual Basic.
Like ODBC, DAO provides a set of APIs for programmatic use. MFC also
Dao (Database Access Object) uses the Microsoft Jet Database Engine to access the database.
Microsoft Jet provides data engines for products such as access and Visual Basic.
Like ODBC, Dao provides a set of APIS for programming. MFC also
SUN provides a set of database access specifications (that is, a set of interfaces) and protocol standards for database connection, then various database manufacturers follow SUN's specifications to provide a set of APIs to access their own database
DAO (DataAccessObjects) Definition: DAO (Data Access Object) is an application programming interface (API), which exists in Microsoft's Visual Basic, it allows programmers to request Access to Microsoft's Access database. The DAO object closes the
DAO provides two different object models, an object model that accesses data through the jet engine, as shown in the following illustration. Another object model is to access data through ODBCDirect. Both of these object models are hierarchically
Original:the difference between Ado,oledb,odbc,daoODBC(Open database Connectivity, opening databases interconnect)In 1992, Microsoft's Open Services Architecture (Wosa,windows Open service Architecture), a component of the database, established a
I have recently worked and found some misunderstandings that I have known. I have been slowly improving my experience at work.
As the system grows bigger and bigger, in order to make the system level clear, we are used to hierarchical
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