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Data Access options

Posted on 2004-10-28
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Last Modified: 2010-04-05
Hi

I have a tables with 500,000 records. and i have many screens in my application.

someone told me that if i use data-aware component then each of them makes a seperate connection with databas....

what are the other option we can access the database and display the data.....without using data aware component...

I am using sql-server and delphi 5 enterprise.....

Mahesh
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Question by:princemahesh
    5 Comments
     
    LVL 27

    Assisted Solution

    by:kretzschmar
    >someone told me that if i use data-aware component then each of them makes a
    >seperate connection with databas....

    thats nonsens

    if u use bde use a tdatabase
    if u use ado use Tadoconnection

    to connect to your database

    meikl ;-)

    0
     

    Author Comment

    by:princemahesh
    Hi

    Thanks meikl for ur comment

    Could you tell me what is common way of displaying data in a object oriented application....

    do we use ado components and data aware components....for data access or is there any other way.

    I am just bit confused about how object oiented principles are implemented while coading...

    Mahesh


    0
     
    LVL 17

    Accepted Solution

    by:
    Hi,

    - one application-wide TADOConnection component for connecting to your SQLServer (ConnectionString property, for instance)
    - several dataset components (TADOQuery, TADOTable, TADODataSet, etc.) connected to the TADOConnection above (their Connection property
    - several TDataSource components, each linked to one dataset component via its DataSet property
    - several DataControl components like TDBGrid, each connected to one TDataSource component via its DataSource property (and DataField property for TDBEdit, etc. which display one field only).

    Regards, Geo
    0
     
    LVL 15

    Expert Comment

    by:mikelittlewood
    Personally, I don't like to use data aware components.

    Rather I use an ADOQuery to pull back the data I need and then manually populate say a TListView with the information you need.
    I tend to work on the prinicipal, don't do anything unless the user causes an event. I also tend to do all my validating within my applications rather than database side

    Geobul is correct though, 1 ADO Connection and several dataset components (usually a READ Query and a READ/WRITE query and maybe a GENERAL query)
    0
     
    LVL 17

    Expert Comment

    by:geobul
    mikelittlewood, me neither :-) I use TEdit, TComboBox, etc. for manipulating data but it requires lots of coding while for displaying purposes the above is just enough.
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