Question

In my project, I am using mvc pattern. I do no know which class operate database operations. That’s I am doing database operations in Model class, but I do not know this is correct. I have confused. Controller class maybe can be correct place insertion, deletion, update oparations. However, I do not know exactly where I have to do database operations. Also I want to search a value in database. Is model class convenient for these operations ? Thanks,

Answer 1

You should learn more about MVC architecture. As stated on Wikipedia

The model manages the behavior and
data of the application domain,
responds to requests for information
about its state (usually from the
view), and responds to instructions to
change state (usually from the
controller). In event-driven systems,
the model notifies observers (usually
views) when the information changes so
that they can react.

The view renders the model into a form
suitable for interaction, typically a
user interface element. Multiple views
can exist for a single model for
different purposes. A viewport
typically has a one to one
correspondence with a display surface
and knows how to render to it.

The controller receives user input and
initiates a response by making calls
on model objects. A controller accepts
input from the user and instructs the
model and viewport to perform actions
based on that input.

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Controller class maybe can be correct
place insertion, deletion, update
oparations.

No. You should do logic in Model. Controller are only used to call that functionalities.

Also I want to search a value in
database. Is model class convenient
for these operations ?

You should do it in Model.