Use of different views..

hi all ,
what are the use of different views which we can create through data dictionary ?
database view.
maintanance view.
projection view
serch help view.
please explain me the diffrence betn this 4 views in terms of Technical characteristic and functional characterestics...
when to use which view ?
what is the purpose of each view.?
any special characteristics of a particular view ?
Thanks in advance..
regards
Raj

hi,
Views improve perfromance in the following aspects
1. If you want to use more than two table in 'JOIN' condition better to use Views . It will improve performance of a program
2. If you want to use mutiple FOR ALL ENTRIES clause, better to club all SELECT statement in a view.
Note:
1.Views does not contain data in it. It fetches data from the database only depending on the condition ...
2.Views are part of data dictionary. They are a window to view the data in database
3.Views can be used to give security to data. users are allowed to view only basic data only
The followings are different types of views:
- Database View (SE11)
Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set.
In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.
- Help View ( SE54)
Help views are used to output additional information when the online help system is called.
When the F4 button is pressed for a screen field, a check is first made on whether a matchcode is defined for this field. If this is not the case, the help view is displayed in which the check table of the field is the primary table. Thus, for each table no more than one help view can be created, that is, a table can only be primary table in at most one help view.
- Projection View
Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed.
A projection view can draw upon only one table. Selection conditions cannot be specified for projection views.
- Maintenance View ( SE54 )
Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.

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Re: [SunONE-JATO] Re: How to use a tiled view without a model

I'm not sure what is different for you now. You still parse the string
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c
Hoskins, John D. wrote:
Thanks for the feedback.
The problem I was solving involved a single string, which contained
delimited subsets of information.
The string looked like
this:"time|analyst|description|time|analyst|description|..."
In ND, I parsed it apart into it's components (time vector, analyst vector,
description vector), populated the repeated.
With JATO, how would I make a model for something that doesn't have a
database component like this?
I'm pretty new to this MVC thing, so bear with me.
John D. Hoskins
Telephone & Data Systems
Application Development & Support
Voice: 608.664.8263
Fax: 608.664.8288
Email: john.hoskins@t...
-----Original Message-----
From: Craig V. Conover [mailto:<a href="/group/SunONE-JATO/post?protectID=219212113009229091025149066024064239039098031198039130252055210">craig.conover@s...</a>]
Sent: 6/26/2002 3.22 PM
Subject: Re: [SunONE-JATO] Re: How to use a tiled view without a model
I guess the only thing "weird" (for lack of a better term) about what
you are doing is that your are populating the model on the "display
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am making.
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Request -> populate model/display data
If it works for you, then it's not necessarilly wrong. But I would
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c
jhoskins wrote:
Craig,
Thanks for the pointers. I ended up doing something else. I set the
models setSize() method to set the max size, and as the tiles fields
iterated, populated the value from some vectors I had the data in
already. Is this solution fraught with peril and will ultimately fail,
or should I try your way?
John
--- Craig V. Conover wrote:
John,
Check out the docs for DefaultModel. There is an appendRow() method.
So get your tiledview's primary model (the tiledview's primary model
should be set to use an instance of DefaultModel), model.appendRow(),
then model.setValue("fieldname", value) for each value.
Rinse, repeat as needed.
c
jhoskins wrote:
I would like to use a tiled view, but populate the fields manually.
Any pointers about where I can set the size of the tiled view? I tried
setMaxDisplayTiles() in the beginDisplay, but it won't get down and
generate the rows.
John Hoskins
To download the latest version of JATO, please visit:
http://www.sun.com/software/download/developer/5102.html
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
To download the latest version of JATO, please visit:
http://www.sun.com/software/download/developer/5102.html
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
To download the latest version of JATO, please visit:
http://www.sun.com/software/download/developer/5102.html
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
To download the latest version of JATO, please visit:
http://www.sun.com/software/download/developer/5102.html
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp

Craig,
Thanks for the pointers. I ended up doing something else. I set the
models setSize() method to set the max size, and as the tiles fields
iterated, populated the value from some vectors I had the data in
already. Is this solution fraught with peril and will ultimately fail,
or should I try your way?
John
--- "Craig V. Conover" wrote:
John,
Check out the docs for DefaultModel. There is an appendRow() method.
So get your tiledview's primary model (the tiledview's primary model
should be set to use an instance of DefaultModel), model.appendRow(),
then model.setValue("fieldname", value) for each value.
Rinse, repeat as needed.
c
jhoskins wrote:
I would like to use a tiled view, but populate the fields manually.
Any pointers about where I can set the size of the tiled view? I tried
setMaxDisplayTiles() in the beginDisplay, but it won't get down and
generate the rows.
John Hoskins
To download the latest version of JATO, please visit:
http://www.sun.com/software/download/developer/5102.html
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp

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