3. Data Access Façade
Discuss DAF, or first come first to see the code:
Code 7: What is DAF?
// Dafbase: Provide basic Data Access support required to most applications,
// including call DAL methods, etc.
Public Abstract Class Dafbase
{
Public Dafbase () {}
Protected Virtual Defbase CallDalmethod
Object [] Paramsvalue)
{
DEFBASE RESULT = NULL;
...
Return Result;
}
...
}
Is it enough FAINT? The so-called Dafbase is a way!
However, it is not difficult to see from the method name, it is through it, we can call true
Positive data access (Data Access Logic) function, and the link to their link is
Data Entity Façade already discussed!
Imagine if there is no Data Entity Façade, we can easily
Is this called in a unified manner (for example: Data Entity is DataTable or
XML, or even ObjectSetj?
Perhaps, some friends will say: That is not difficult, can you use the object type directly? If this is true, then, please do a test, you know how unrealistic (N more places need to judge Data Entity Type and mandatory type conversion, this is different from the implicit operatorl)!
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