Sites on Object Oriented Databases??????

Hi
I want some help on OOD. Please recommend some sites on this topic.
Thanks

Amjad,
Oracle database is an Object-Relational Database. In addition to relational functionality, Oracle8i and 9i also provide Objects features with user-defined types, type inheritance, as well as corresponding language APIs in Java, XML, C/C++, PL/SQL, and VB. You can check out the documentation at http://download-west.oracle.com/otndoc/oracle9i/901_doc/appdev.901/a88878/toc.htm. You can also posted your questions to'Oracle Objects' forum.
Regards,
Geoff

Similar Messages

Is oracle OODBMS (Object Oriented database management system)?

Hello, All
Is oracle OODBMS (Object Oriented database management system)? and if yes, please explain.
I have query in my mind so, I just posted here.
Regards,
Rahul
Edited by: Rahul K. Thakar on Nov 3, 2010 12:03 PM
Edited by: Rahul K. Thakar on Nov 3, 2010 12:04 PM

I believe the precise answer is that Oracle is ORDBMS (Object-Relational DBMS).For a brief period in time Oracle Corporation offered a product called Object Oriented Oracle (OOO).
It was such a wonderous product that it was buried in the trash can of history when it did neither task very well.

Object Oriented Databases

Has anyone had any experience with connecting Forte with an Object Oriented
Database (such as ObjectStore)?
Two things:
1. Impact on application architecture
2. Speed of database operations.
Thanks
Dan Parker
Michelin North America (Canada) Inc
902 753 1789
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Bump?

Only oracle object tables to create object oriented database

Can we use only oracle object tables for a database and if it can be done, can we create pure object oriented database with oracle. How it can be done?
help..
thank you..

PriyashanthaHP wrote:
I have no my own definitions for OODB. There are lot in the internet. I'm asking, can't we use that OODB concept with oracle. And gave you an example with 'employee' and 'department' tables. I asked that can we create object tables for these two tables keeping their relationship
thank you..
There is no way to answer that without knowing what YOU mean by OODB.
See the database concepts doc
http://docs.oracle.com/cd/B28359_01/server.111/b28318/schema.htm
Nested Tables
You can create a table with a column whose datatype is another table. That is, tables can be nested within other tables as values in a column. The Oracle database server stores nested table data out of line from the rows of the parent table, using a store table that is associated with the nested table column. The parent row contains a unique set identifier value associated with a nested table instance.
Oracle Database Object-Relational Developer's Guidefor further information on nested tables
Oracle Database Advanced Application Developer's Guide

Why generate object-oriented database schema

Let me begin with an example:
public class Base
protected int id = 0;
protected String name = null;
public class Derived extends Base
protected int type = 0;
Derived class and Base class form an object-oriented inheritence. After
using SchemaToolTask, the following table definition is generated :
create table base
id INT NOT NULL,
name VARCHAR(255),
PRIMARY KEY (id)
create table derived
id INT NOT NULL,
type INT,
PRIMARY KEY (id)
Actually, RDBMS is ER-oriented. Every meaningful entity corresponds to a
database table. But in this example, maybe "Base" has no any meaning, just
for abstraction. So why we must generate this table ? Why cannot be
configurated to just generate
create table derived
id INT NOT NULL,
name VARCHAR(255),
type INT,
PRIMARY KEY (id)
This will not only avoid join operation in SELECT, but also reduce the table
size according to Base class.
Thanks
Liang Zhilong
EMail : [email protected]
Tel : (021)54235858-6650
Fax : (021)54235800
PhotonicBridges Co., Ltd.
12F, 900 Yi Shan Rd., Shanghai 200233

As I said, this is quite high on our project plans.
On Wed, 25 Jun 2003 14:41:29 +0800, Liang Zhilong wrote:
I believe your concern is reasonable. However, in our application, the
operation you assumed( to find all base instances owned by class C) is
rare, so it'll be useful if my suggested mapping is taken as an option.
Moreover, we should not get better performance at the cost of worse
database schema. Kodo should have enough capacity to optimize database
operations. For example, to find all base instances owned by class C, kodo
should issue a "SELECT col1, col2 FROM a UNION SELECT col1, col2 FROM b".
"Stephen kim" <[email protected]>
??????:[email protected]...
This sort of mapping is on our project plan but know that there a number
of severe performance penalties that can happen with the mapping you
describe. If you desire to lack the join, a flat-class mapping is the
most efficient table structure.
Take for example the multiple classes problem:
base
|_ A
|_ B
which would result in table a and table b. Now try to do an ordering
query. You would issue 2 selects and then have to merge in memory. To
do any relation join, again you multiply the number of SQL statements by
the number of subclasses (e.g. to find all base instances owned by class
C, you would have to query against a and b).
On Wed, 25 Jun 2003 12:39:39 +0800, Liang Zhilong wrote:
Let me begin with an example:
public class Base
protected int id = 0;
protected String name = null;
public class Derived extends Base
protected int type = 0;
Derived class and Base class form an object-oriented inheritence.
After using SchemaToolTask, the following table definition is
generated :
create
table base
id INT NOT NULL,
name VARCHAR(255),
PRIMARY KEY (id)
create table derived
id INT NOT NULL,
type INT,
PRIMARY KEY (id)
Actually, RDBMS is ER-oriented. Every meaningful entity corresponds to
a database table. But in this example, maybe "Base" has no any
meaning,just
for abstraction. So why we must generate this table ? Why cannot be
configurated to just generate
create table derived
id INT NOT NULL,
name VARCHAR(255),
type INT,
PRIMARY KEY (id)
This will not only avoid join operation in SELECT, but also reduce the
table size according to Base class.
Thanks
Liang Zhilong
EMail : [email protected]
Tel : (021)54235858-6650
Fax : (021)54235800
PhotonicBridges Co., Ltd.
12F, 900 Yi Shan Rd., Shanghai 200233--
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com

Is Berkeley an object-oriented database?

As the subject described, please help me to understand if the Berkeley is an object-oriented, or a data structure based database.

Hi Kevin,
A Berkeley DB database is like a relational table. Data is stored as key/data pairs and a key/data pair (a record) is similar to an RDBMS row with a primary key.
What Berkeley DB is not: http://www.oracle.com/technology/documentation/berkeley-db/db/ref/intro/dbisnot.html
What is Berkeley DB: http://www.oracle.com/technology/documentation/berkeley-db/db/ref/intro/dbis.html
Do you need Berkeley DB?: http://www.oracle.com/technology/documentation/berkeley-db/db/ref/intro/need.html
Bogdan Coman

Object Oriented Databases and entity beans?

Does one of the authors care to comment on the benefits of using OODBMS models versus RDBMS models for entity beans? Any differences between BMP and CMP in this scenario?
Thanks!
Peter

Bump?

Can I develop a 100% Object Oriented DB with Oracle 11?

Hello!
I want to know if I can develop a 100% object oriented data base in Oracle 10g or 11? I have reed the "Oracle Database 11g The Complete Reference" chapter 41 "Advanced Object-
Oriented Concepts" and I still have the doubt if I can implement a database 100% object-oriented. I hope you can help me.
Thanks!

>
I want to know if I can develop a 100% object oriented data base in Oracle 10g or 11?
>
The short answer is no.
See this AskTom blog for the long answer.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1545206281987
It starts off with Tom saying
>
First off, in Oracle you would be considering pure relational versus Object RELATIONAL,
not OO. We have object relational extensions to the relational database. We do not have
an object oriented database.
>
I think you will find a lot of infomation in there from Tom and other respondents about the differences between relational, object relational and object oriented.

Can I develop a 100% Object Oriented DB with Oracle 10g?

Hello!
I need to know if I can develop a pure Object Oriented Data Base? because I have been looking for this information, and I just found Oracle's arquitecture is oriented to relational object model.
Thanks!
Edited by: 925803 on 05-abr-2012 10:39

Dear "925803",
1) You're asking this question in the Oracle Application Express discussion forum - not really related to generic Database questions. This Database forum may be more suited: General Database Discussions
2) The Oracle database is not an object-oriented database.
Joel

Object Oriented? Or Not?

Perhaps the way I raised this question would be peculiar for you as I'm a newbie!
I'm willing to use oracle object oriented programing for my applications, and some senior people(work in my organization) told me that Object oriented database concept is failed in the industry. As a reason they say that; even if Object oriented databases solved some problems people had with relational databases, still Object oriented databases are failed to facilitate most of the advantages of relational databases. It's somewhat chaotic for me, as I'm new to PL developments.
They didn't mention any specific reason; but just told me that relational databases perform well and faster than object oriented databases, and for business logic, object oriented databases has some accuracy issues.
But I'm not ready to accept that it will be useless to learn 'Oracle Object Oriented Programing' or 'Object Oriented Database Concept' would be failed.
So I need to know,
1. Will it be useless to learn & use 'OOP' techniques when learning PL/SQL programing?
2. Is there any disadvantage of using 'OOP' with oracle? (If there is any, please let me know if you have time for that).
Especially, (The most pleasing answer I would like to hear from you ;-) )
3. If Object Oriented Databases concept is better and something that a "PL/SQL" developer must learn; please let me know that.
Please provide me a link if you can, which would help me to learn why should we use 'OOP' with oracle (if Object oriented database is better than Relational database)

Intruder wrote:
So I need to know,
1. Will it be useless to learn & use 'OOP' techniques when learning PL/SQL programing?No. OOP has very little do with relational database design. The two is not mutually exclusive and can co-exist easily.
2. Is there any disadvantage of using 'OOP' with oracle? (If there is any, please let me know if you have time for that).That depends on how+ you use it. If OOP was truly horrible and bad, then why does Oracle spend money on the research and development on it for their RDBMS product?
Especially, (The most pleasing answer I would like to hear from you ;-) )
3. If Object Oriented Databases concept is better and something that a "PL/SQL" developer must learn; please let me know that.OOP is not Object Orientated Database. These are two very different concepts. OOP competes with procedural programming. Object Orientated Database design competes with Relational Database Design (and others of course).
There are two primary issues with an Object Orientated Database design. Complexity. Performance.
Do you for example store the subclasses of the same abstract class in the same physical object table? You can do that in Oracle.. but then the database need to resolve the class type at run-time.. every single time.. for every single object accessed... At what cost ito performance?
How do you treat collection classes? A collection can be stored as a physical table. It can also be stored as an attribute (column) of an object (table) - in which case the physical implementation for that is a nested table. There are dire performance issues with nested tables when these are used and applied incorrectly.
There are numerous such issues.
Compare this with something as mature and robust as Relational Database Design. Easy to understand. Easy to use. And what the Oracle RDBMS product was specifically designed to support.
Which one is "+better+" (especially in the Oracle RDBMS environment)? It should be obvious.
I suggest that you read Codd's original paper on "+A Relation Model of Data for Large Shared Data Banks+", read "+The Third Manifesto+" from Chris Date, and papers from various other authors for insight.

Relational or Object-oriented

Hi everyone,
I'm just a novice in db design and have been given the task to design a db for our app. The app data consists of multiple Java node objects (as many as the user can think of, and needs to have) that, most of the time, have references to the parents and children (nodes). The main goal is to facilitate searching of objects (based on attributes) and object sharing. The objects are composite, meaning they contain links to others that contain links to many others.
I'm confused of which, relation or object oriented, databse is a better fit for the design. So far, several questions have popped up like:
1. To represent links (to other objects), which, an object id or a primary key, is better?
2. How to represent Java vector and hashtable in db?
3. If objects A and B link to C, after A and C are loaded, then if B is loaded, how do I know to share the copy of C (from A) instead of creating a new one?
Any help from you db experts, or if i can be pointed to the right direction, is greatly appreciated. And forgive me if I ask stupid questions.
Thanks,

You can use either a relational or an object-oriented database to store this sort of information. An object-oriented design may well be easier to build an object-oriented database if the goal is basically to use a database as a persistent bitbucket of objects that you will instantiate in an application server.
My preference, however, would be to use a relational database because that makes the data much more accessible to other applications. In most cases, if the data is valuable enough to want to write an application around, it is valuable enough to want to ensure that it survives any particular application. Relational databases are much better at this than are object databases, which necessarily enshrine a particular way of looking at the data.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Open source, object-oriented embedded database for J2ME

For J2ME-based devices that require embedded data management, there is now an open source, object-oriented embedded database for J2ME called Perst Lite.
Perst Lite can be downloaded as part of the Perst open source embedded database package, at
http://www.mcobject.com/downloads.php?step=2&catID=4
Cheers,
Ted

Spam blocked. As this user has only ever logged in here to post spam, the user account is blocked for a year.
db

EXECUTE permission denied on object 'xp_sqlagent_notify', database 'mssqlsystemresource', schema 'sys'.

I'm trying to create a new subscriptions on an existing report and get the following error.
An internal error occurred on the report server. See the error log for more details. (rsInternalError) Get Online Help
Get Online Help
EXECUTE permission denied on object 'xp_sqlagent_notify', database 'mssqlsystemresource', schema 'sys'.
I ran the following that was suggested in http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=17774&SiteID=1. But still I get the same error. Do I need a reboot or restart of the services?
The only log file information I can find contains the following.
System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: An internal error occurred on the report server. See the error log for more details. ---> Microsoft.ReportingServices.Diagnostics.Utilities.InternalCatalogException: An internal error occurred on the report server. See the error log for more details. ---> System.Data.SqlClient.SqlException: EXECUTE permission denied on object 'xp_sqlagent_notify', database 'mssqlsystemresource', schema 'sys'.
   --- End of inner exception stack trace ---
   at Microsoft.ReportingServices.WebServer.ReportingService2005.ListSchedules(Schedule[]& Schedules)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   at Microsoft.SqlServer.ReportingServices2005.ReportingService2005.ListSchedules()
   at Microsoft.SqlServer.ReportingServices2005.RSConnection.ListSchedules()
   at Microsoft.ReportingServices.UI.SharedScheduleDropDown.EnsureSchedulesAreLoaded()
   at Microsoft.ReportingServices.UI.SharedScheduleDropDown.SharedScheduleDropDown_Load(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
aspnet_wp!ui!1!17/10/2006-08:44:26:: e ERROR: Exception in ShowErrorPage: System.Threading.ThreadAbortException: Thread was being aborted.
   at System.Threading.Thread.AbortInternal()
   at System.Threading.Thread.Abort(Object stateInfo)
   at System.Web.HttpResponse.End()
   at System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm)
   at Microsoft.ReportingServices.UI.ReportingPage.ShowErrorPage(String errMsg) at    at System.Threading.Thread.AbortInternal()
   at System.Threading.Thread.Abort(Object stateInfo)
   at System.Web.HttpResponse.End()
   at System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm)
   at Microsoft.ReportingServices.UI.ReportingPage.ShowErrorPage(String errMsg)
aspnet_wp!extensionfactory!e!17/10/2006-09:35:13:: w WARN: The extension Report Server Email does not have a LocalizedNameAttribute.
aspnet_wp!extensionfactory!e!17/10/2006-09:35:13:: w WARN: The extension Report Server FileShare does not have a LocalizedNameAttribute.
aspnet_wp!ui!e!17/10/2006-09:35:13:: e ERROR: System.Web.Services.Protocols.SoapException: An internal error occurred on the report server. See the error log for more details. ---> Microsoft.ReportingServices.Diagnostics.Utilities.InternalCatalogException: An internal error occurred on the report server. See the error log for more details. ---> System.Data.SqlClient.SqlException: EXECUTE permission denied on object 'xp_sqlagent_notify', database 'mssqlsystemresource', schema 'sys'.
   --- End of inner exception stack trace ---
   at Microsoft.ReportingServices.WebServer.ReportingService2005.ListSchedules(Schedule[]& Schedules)
aspnet_wp!ui!e!17/10/2006-09:35:13:: e ERROR: HTTP status code --> 200
I cannot find any other error log.
Can anybody help?
Tuesday, October 17, 2006 8:49 AM
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Sorry for the late reply. Try this: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=662319&SiteID=1
Thursday, November 16, 2006 2:51 AM
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GRANT EXECUTE ON master.dbo.xp_sqlagent_notify TO RSExecRole
GO
solved my problem.
Proposed as answer by
Christopher D. Stover
Monday, September 16, 2013 6:52 PM
Monday, September 16, 2013 6:51 PM
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Tried that but no joy. Found this post on SQLServerCentral, solved our issue which mimic's the posters issue. Just adding here as this is the first result in our search.
Look for Topic452669-150-1
There are a number of places I found with the information in the following
link:
http://phew-meme.blogspot.com/2007/10/reporting-service-on-report.html
In
my specific case, the RsExecRole role in both the "master" and "msdb" databases
had had both the "NT Authority\Network Service" and "NTAuthority\System" logins
removed from its members (the RSExecRole had had all its members removed by
someone doing some maintenance). I compared another Reporting Services
installation on another server after reading information in the above
link.
Steps:
1. In Mangement Studio connect to the SQL Server instance
on which Reporting Services runs.
2. Databases > system Databases
3.
master > Security > Roles > RSExecRole (then add whatever logins are
required... check in the ReportServer or ReportServerTempDB databases if you're
not sure)
4. msdb > Security > Roles > RSExecRole (add the same
logins you did to the master DB)
In the end you need the same logins in
RSExecRole role for the master, msdb, ReportServer, and ReportServerTempDB
databases. ("ReportServer" is the default Reporting Services database name, in
case that's not clear ;)
Monday, March 31, 2014 1:24 PM
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Tried that but no joy. Found this post on SQLServerCentral, solved our issue which mimic's the posters issue. Just adding here as this is the first result in our search.
Look for Topic452669-150-1
There are a number of places I found with the information in the following
link:
http://phew-meme.blogspot.com/2007/10/reporting-service-on-report.html
In
my specific case, the RsExecRole role in both the "master" and "msdb" databases
had had both the "NT Authority\Network Service" and "NTAuthority\System" logins
removed from its members (the RSExecRole had had all its members removed by
someone doing some maintenance). I compared another Reporting Services
installation on another server after reading information in the above
link.
Steps:
1. In Mangement Studio connect to the SQL Server instance
on which Reporting Services runs.
2. Databases > system Databases
3.
master > Security > Roles > RSExecRole (then add whatever logins are
required... check in the ReportServer or ReportServerTempDB databases if you're
not sure)
4. msdb > Security > Roles > RSExecRole (add the same
logins you did to the master DB)
In the end you need the same logins in
RSExecRole role for the master, msdb, ReportServer, and ReportServerTempDB
databases. ("ReportServer" is the default Reporting Services database name, in
case that's not clear ;)

HOw to make an Object oriented alv respond to double click

Hi all,
HOw to make an Object oriented alv respond to double click.SAmple code will be helpful.
Thanks in advance,
Alex.

Hi,
1. Create a Control (for Custom and Split Containers only)
2. Instantiate a Container Object (in case of Custom and Split Containers, specify the control which is created by us in Screen painter) CREATE OBJECT
3. Instantiate an Object of the kind of report that has to be displayed (List, Grid or Tree). CREATE OBJECT . Here we need to specify the Parent Container as the so that it sits in that container.
4. Call appropriate methods to display the report on the screen. CALL METHOD ->
DATA : g_dock TYPE REF TO cl_gui_docking_container,
g_split TYPE REF TO cl_gui_easy_splitter_container,
g_cont1 TYPE REF TO cl_gui_container,
g_cont2 TYPE REF TO cl_gui_container,
g_grid1 TYPE REF TO cl_gui_alv_grid,
g_grid2 TYPE REF TO cl_gui_alv_grid.
i_mara is an internal table of structure MARA
SELECT * FROM mara INTO TABLE i_mara.
i_kna1 is an internal table of structure KNA1
SELECT * FROM kna1 INTO TABLE i_kna1.
To create an Object of type Docking Container
CREATE OBJECT g_dock
EXPORTING
side = cl_gui_docking_container=>dock_at_top
extension = 200 .
To Create an Object of Type Split Container. Here we can see that the Docking *Container Created above has been used as a parent .
CREATE OBJECT g_split
EXPORTING
parent = g_dock
orientation = 1 .
Easy Split container splits one Control into 2 manageable controls, each of them is used * to handle one GUI Container each
g_cont1 = g_split->top_left_container.
g_cont2 = g_split->bottom_right_container.
To Create an Object of type Grid . Here we can see that the Left Split Container * Created above has been used as a parent .
CREATE OBJECT g_grid1
EXPORTING
i_parent = g_cont1 .
To Create an Object of type Grid . Here we can see that the Right Split Container * Created above has been used as a parent .
CREATE OBJECT g_grid2
EXPORTING
i_parent = g_cont2 .
The method of Grid Control Object is used to display the Data.
CALL METHOD g_grid1->set_table_for_first_display
EXPORTING
i_structure_name = 'MARA'
CHANGING
it_outtab = i_mara[] .
The method of Grid Control Object is used to display the Data.
CALL METHOD g_grid2->set_table_for_first_display
EXPORTING
i_structure_name = 'KNA1'
CHANGING
it_outtab = i_kna1[] .
Regards
Hari

What are the basic pillars of Object Oriented Programming?

there are 3 pillars of OOP which are Encapsulation, inheritance, polymorphism, but i heard lot's of people even companies software engineers use abstraction is a pillar, i haven't find it from MSDN why abstraction is not a pillar ?

Whereas encapsulation, inheritence and polymorphism are specific implementation details of OOP (i.e. the key ideas that make programming
object-oriented), abstraction is a high-level way of looking at your overall application design.
For example, in a simple database application you would not want to write your code so that your user-interface, business logic, and database code was all hard-coded and "tied" to each other.
Ideally you would think about your design and try to plan your application so that your user-interface code is independent of your business logic code (which can be "plugged-in" and/or changed as necessary), which is again independent of your database
code such that you could even switch to a different database and only need to change that one part of your code-base.
As an example, you might not pass a class representing some business logic directly into your user-interface code. Rather, you may want to create an interface representing a generic way of representing your logic that could be re-used by lots of business
classes. It is then this interface that could be used by your UI code or database code to validate data, rather than specific classes. Then you could create more classes in future that just have to implement the same interfaces, knowing that the rest of your
code would not need to change. This is just one aspect of "abstraction".
If you do a search for "application design patterns" or "object-oriented design patterns" you will find plenty of articles and books on how to go about doing this.

Sites on Object Oriented Databases??????

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