I recently restored a database to a 2005 SQL Server and it is now
reporting that it is in standby / readonly mode. I've seen some
suggestion that this could be solved through re-restoring the database
but the database restore isn't an option. I've tried taking it offline
so that I could get access to restore it and haven't had any luck
there as well. Is there something I'm missing here or do I just need
to drop and restore the database all over again?RESTORE DATABASE [database_name] WITH RECOVERY
"johnvmc@.gmail.com" wrote:
> I recently restored a database to a 2005 SQL Server and it is now
> reporting that it is in standby / readonly mode. I've seen some
> suggestion that this could be solved through re-restoring the database
> but the database restore isn't an option. I've tried taking it offline
> so that I could get access to restore it and haven't had any luck
> there as well. Is there something I'm missing here or do I just need
> to drop and restore the database all over again?
>
Showing posts with label reporting. Show all posts
Showing posts with label reporting. Show all posts
Thursday, March 29, 2012
Database images not showing
How should I store an image into my SQL database in order to be able to read
it using Reporting Services Image control? I have a table with an image
field (datatype of the field is 'Image').
I have tried several ways and the report is always rendered with the image
showing a red cross inside it (image broken). However if I read the table
using MS Access ADP and double click on the image field, MS Paint opens and
shows up the image (this is a bmp image). I have also set the MIMEType of
the rs image field to 'image/bmp' (filling this field this is compulsory
with database images).
It seems that, even though the database field contents ('Image' field) are
properly stored, Reporting Services does not know how to handle it. May I
need to do a CONVERT(Binary, MyImageField) or the database field be of
another type? How should I store the image inside the database so that RS
could read it?
Regards.
PS: This is RS SP2.This sounds like the images are stored as OLE images in the database (e.g.
Access would convert images into OLE images). You can try the following
expression to get rid of the OLE chunk:
=System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
105))
--
This posting is provided "AS IS" with no warranties, and confers no rights.
"David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
> How should I store an image into my SQL database in order to be able to
> read it using Reporting Services Image control? I have a table with an
> image field (datatype of the field is 'Image').
> I have tried several ways and the report is always rendered with the image
> showing a red cross inside it (image broken). However if I read the table
> using MS Access ADP and double click on the image field, MS Paint opens
> and shows up the image (this is a bmp image). I have also set the MIMEType
> of the rs image field to 'image/bmp' (filling this field this is
> compulsory with database images).
> It seems that, even though the database field contents ('Image' field) are
> properly stored, Reporting Services does not know how to handle it. May I
> need to do a CONVERT(Binary, MyImageField) or the database field be of
> another type? How should I store the image inside the database so that RS
> could read it?
> Regards.
> PS: This is RS SP2.
>|||Thanks for your reply but it seems that there should be another reason. Your
explanation is on the good road, but
I have tried your expression, with that 105 varying from 100 to 110 with the
same results. The red cross is still there.
Any other suggestion? Regards.
PS: Just for further debugging, I have an output of the first 950 bytes
generated by the expression:
=System.Convert.ToBase64String(Fields!Picture.Value)
Here they follow:
FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
"Robert Bruckner [MSFT]" <robruc@.online.microsoft.com> escribió en el
mensaje news:eL5pK2LVFHA.612@.TK2MSFTNGP12.phx.gbl...
> This sounds like the images are stored as OLE images in the database (e.g.
> Access would convert images into OLE images). You can try the following
> expression to get rid of the OLE chunk:
> =System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
> 105))
> --
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
> "David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
> news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
>> How should I store an image into my SQL database in order to be able to
>> read it using Reporting Services Image control? I have a table with an
>> image field (datatype of the field is 'Image').
>> I have tried several ways and the report is always rendered with the
>> image showing a red cross inside it (image broken). However if I read the
>> table using MS Access ADP and double click on the image field, MS Paint
>> opens and shows up the image (this is a bmp image). I have also set the
>> MIMEType of the rs image field to 'image/bmp' (filling this field this is
>> compulsory with database images).
>> It seems that, even though the database field contents ('Image' field)
>> are properly stored, Reporting Services does not know how to handle it.
>> May I need to do a CONVERT(Binary, MyImageField) or the database field be
>> of another type? How should I store the image inside the database so that
>> RS could read it?
>> Regards.
>> PS: This is RS SP2.
>|||More information on the subject:
I have been doing more tests with this sample bitmap. I have sent it to
myself via email just to read the source code of the message and extract the
base64 of the bitmap. The header of attachment and some hundreds the
begining bytes are here:
--_=_NextPart_001_01C55532.6E34D77F
Content-Type: image/bmp;
name="PHOTO.BMP"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="PHOTO.BMP"
Qk1gSAAAAAAAAHYAAAAoAAAAzwAAALEAAAABAAQAAAAAAAAAAAAQFwAAEBcAAAAAAAAAAAAAAAAA
AP///wD6+voA8/PzAOfn5wDb29sAzMzMALm5uQCjo6MAi4uLAHNzcwBZWVkAQkJCAC8vLwAfHx8A
Dw8PABERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
EREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERARERERERERERERERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
EREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
etc...
If I copy this base64 chunk of data and set the Reporting Services image
field to:
=System.Convert.FromBase64String("the chunk")
The image is shown perfecly on the report.
However, if I compare some bytes of the begining of this chunk (which is
shown to be correct) and try to find it somewhere on the string returned by:
=System.Convert.ToBase64String(Fields!Picture.Value)
which is:
FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
I can't find it anywhere. There is no 'Qk1gS' substring in it. Now my
question are: Are there multiple ways of converting a file into a base64
string? How can I remove the OLE header of the database if I cannot find the
matching of the image REAL data using this 'comparing' approach?
Regards.
"David Lightman Robles" <dlightman@.NOSPAMiname.com> escribió en el mensaje
news:%23AtcAySVFHA.2124@.TK2MSFTNGP14.phx.gbl...
> Thanks for your reply but it seems that there should be another reason.
> Your explanation is on the good road, but
> I have tried your expression, with that 105 varying from 100 to 110 with
> the same results. The red cross is still there.
> Any other suggestion? Regards.
> PS: Just for further debugging, I have an output of the first 950 bytes
> generated by the expression:
> =System.Convert.ToBase64String(Fields!Picture.Value)
> Here they follow:
> FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
>
> "Robert Bruckner [MSFT]" <robruc@.online.microsoft.com> escribió en el
> mensaje news:eL5pK2LVFHA.612@.TK2MSFTNGP12.phx.gbl...
>> This sounds like the images are stored as OLE images in the database
>> (e.g. Access would convert images into OLE images). You can try the
>> following expression to get rid of the OLE chunk:
>> =System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
>> 105))
>> --
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>> "David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
>> news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
>> How should I store an image into my SQL database in order to be able to
>> read it using Reporting Services Image control? I have a table with an
>> image field (datatype of the field is 'Image').
>> I have tried several ways and the report is always rendered with the
>> image showing a red cross inside it (image broken). However if I read
>> the table using MS Access ADP and double click on the image field, MS
>> Paint opens and shows up the image (this is a bmp image). I have also
>> set the MIMEType of the rs image field to 'image/bmp' (filling this
>> field this is compulsory with database images).
>> It seems that, even though the database field contents ('Image' field)
>> are properly stored, Reporting Services does not know how to handle it.
>> May I need to do a CONVERT(Binary, MyImageField) or the database field
>> be of another type? How should I store the image inside the database so
>> that RS could read it?
>> Regards.
>> PS: This is RS SP2.
>>
>|||Instead of doing tests with the final image, I have created a 5x5 pix bitmap
to work/test with.
The Base64 encoding of it (grabbed from an email sourcecode is):
Qk2GAAAAAAAAADYAAAAoAAAABQAAAAUAAAABABgAAAAAAFAAAAAAAAAAAAAAAAAAAAAAAAAA////////////////////AP///wAA/////////wAA/wD///////////////////8A////////AAD/////AAD/AAAA/////////////////wA=
It works perfectly if I set the value property of the rs image to:
=System.Convert.FromBase64String("the former base64 string")
Now, the database version of the same file: I set a texbox in the RS report
and set its value to =System.Convert.ToBase64String(Fields!Picture.Value) so
that I could retrieve the complete base64 of the image stored in the
database. Here it is:
FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAoAAAAEJNhgAAAAAAAAA2AAAAKAAAAAUAAAAFAAAAAQAYAAAAAABQAAAAAAAAAAAAAAAAAAAAAAAAAP///////////////////wD///8AAP////////8AAP8A////////////////////AP///////wAA/////wAA/wAAAP////////////////8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBQAAAAAAAIqtBf4=
By other means, I have been able to revert this base64 string back to binary
and here are the results:
9 + ÿÿÿÿImagen de mapa de bits Paint.Picture PBrush
BM? 6 ( P ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿ
ÿÿÿÿÿÿÿ ÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿ ÿÿÿÿ ÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿ
S þ
Of course, I have some rubbish here. But not everything is lost: Now I can
see that a localized language string is included in the OLE chunk before the
'BM' indicating the begining of the bitmap file. And now the final question:
Should I use other string than
=System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
105))
when the locale of the systems/servers/software is not english? In my case
I'm using spanish and since the string 'Imagen de mapa de bits' is not as
long as 'Bitmap image file', I think that 105 is not valid/correct when
other languages are used.
After some calculations I think that the OLE chunk size for spanish (which
is my case) is 121 instead of 105. However the red cross is still there!!!!!
:(((
Another aproach, instead of letting RS cropping the image ole data, is to
retrieve the image from the database without it. Is it feasible to retrieve
just a 'substring' of the image?
Please help. I really need it. Thaks.
"David Lightman Robles" <dlightman@.NOSPAMiname.com> escribió en el mensaje
news:%23AtcAySVFHA.2124@.TK2MSFTNGP14.phx.gbl...
> Thanks for your reply but it seems that there should be another reason.
> Your explanation is on the good road, but
> I have tried your expression, with that 105 varying from 100 to 110 with
> the same results. The red cross is still there.
> Any other suggestion? Regards.
> PS: Just for further debugging, I have an output of the first 950 bytes
> generated by the expression:
> =System.Convert.ToBase64String(Fields!Picture.Value)
> Here they follow:
> FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
>
> "Robert Bruckner [MSFT]" <robruc@.online.microsoft.com> escribió en el
> mensaje news:eL5pK2LVFHA.612@.TK2MSFTNGP12.phx.gbl...
>> This sounds like the images are stored as OLE images in the database
>> (e.g. Access would convert images into OLE images). You can try the
>> following expression to get rid of the OLE chunk:
>> =System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
>> 105))
>> --
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>> "David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
>> news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
>> How should I store an image into my SQL database in order to be able to
>> read it using Reporting Services Image control? I have a table with an
>> image field (datatype of the field is 'Image').
>> I have tried several ways and the report is always rendered with the
>> image showing a red cross inside it (image broken). However if I read
>> the table using MS Access ADP and double click on the image field, MS
>> Paint opens and shows up the image (this is a bmp image). I have also
>> set the MIMEType of the rs image field to 'image/bmp' (filling this
>> field this is compulsory with database images).
>> It seems that, even though the database field contents ('Image' field)
>> are properly stored, Reporting Services does not know how to handle it.
>> May I need to do a CONVERT(Binary, MyImageField) or the database field
>> be of another type? How should I store the image inside the database so
>> that RS could read it?
>> Regards.
>> PS: This is RS SP2.
>>
>
it using Reporting Services Image control? I have a table with an image
field (datatype of the field is 'Image').
I have tried several ways and the report is always rendered with the image
showing a red cross inside it (image broken). However if I read the table
using MS Access ADP and double click on the image field, MS Paint opens and
shows up the image (this is a bmp image). I have also set the MIMEType of
the rs image field to 'image/bmp' (filling this field this is compulsory
with database images).
It seems that, even though the database field contents ('Image' field) are
properly stored, Reporting Services does not know how to handle it. May I
need to do a CONVERT(Binary, MyImageField) or the database field be of
another type? How should I store the image inside the database so that RS
could read it?
Regards.
PS: This is RS SP2.This sounds like the images are stored as OLE images in the database (e.g.
Access would convert images into OLE images). You can try the following
expression to get rid of the OLE chunk:
=System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
105))
--
This posting is provided "AS IS" with no warranties, and confers no rights.
"David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
> How should I store an image into my SQL database in order to be able to
> read it using Reporting Services Image control? I have a table with an
> image field (datatype of the field is 'Image').
> I have tried several ways and the report is always rendered with the image
> showing a red cross inside it (image broken). However if I read the table
> using MS Access ADP and double click on the image field, MS Paint opens
> and shows up the image (this is a bmp image). I have also set the MIMEType
> of the rs image field to 'image/bmp' (filling this field this is
> compulsory with database images).
> It seems that, even though the database field contents ('Image' field) are
> properly stored, Reporting Services does not know how to handle it. May I
> need to do a CONVERT(Binary, MyImageField) or the database field be of
> another type? How should I store the image inside the database so that RS
> could read it?
> Regards.
> PS: This is RS SP2.
>|||Thanks for your reply but it seems that there should be another reason. Your
explanation is on the good road, but
I have tried your expression, with that 105 varying from 100 to 110 with the
same results. The red cross is still there.
Any other suggestion? Regards.
PS: Just for further debugging, I have an output of the first 950 bytes
generated by the expression:
=System.Convert.ToBase64String(Fields!Picture.Value)
Here they follow:
FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
"Robert Bruckner [MSFT]" <robruc@.online.microsoft.com> escribió en el
mensaje news:eL5pK2LVFHA.612@.TK2MSFTNGP12.phx.gbl...
> This sounds like the images are stored as OLE images in the database (e.g.
> Access would convert images into OLE images). You can try the following
> expression to get rid of the OLE chunk:
> =System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
> 105))
> --
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
> "David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
> news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
>> How should I store an image into my SQL database in order to be able to
>> read it using Reporting Services Image control? I have a table with an
>> image field (datatype of the field is 'Image').
>> I have tried several ways and the report is always rendered with the
>> image showing a red cross inside it (image broken). However if I read the
>> table using MS Access ADP and double click on the image field, MS Paint
>> opens and shows up the image (this is a bmp image). I have also set the
>> MIMEType of the rs image field to 'image/bmp' (filling this field this is
>> compulsory with database images).
>> It seems that, even though the database field contents ('Image' field)
>> are properly stored, Reporting Services does not know how to handle it.
>> May I need to do a CONVERT(Binary, MyImageField) or the database field be
>> of another type? How should I store the image inside the database so that
>> RS could read it?
>> Regards.
>> PS: This is RS SP2.
>|||More information on the subject:
I have been doing more tests with this sample bitmap. I have sent it to
myself via email just to read the source code of the message and extract the
base64 of the bitmap. The header of attachment and some hundreds the
begining bytes are here:
--_=_NextPart_001_01C55532.6E34D77F
Content-Type: image/bmp;
name="PHOTO.BMP"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="PHOTO.BMP"
Qk1gSAAAAAAAAHYAAAAoAAAAzwAAALEAAAABAAQAAAAAAAAAAAAQFwAAEBcAAAAAAAAAAAAAAAAA
AP///wD6+voA8/PzAOfn5wDb29sAzMzMALm5uQCjo6MAi4uLAHNzcwBZWVkAQkJCAC8vLwAfHx8A
Dw8PABERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
EREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERARERERERERERERERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
EREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERER
ERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
etc...
If I copy this base64 chunk of data and set the Reporting Services image
field to:
=System.Convert.FromBase64String("the chunk")
The image is shown perfecly on the report.
However, if I compare some bytes of the begining of this chunk (which is
shown to be correct) and try to find it somewhere on the string returned by:
=System.Convert.ToBase64String(Fields!Picture.Value)
which is:
FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
I can't find it anywhere. There is no 'Qk1gS' substring in it. Now my
question are: Are there multiple ways of converting a file into a base64
string? How can I remove the OLE header of the database if I cannot find the
matching of the image REAL data using this 'comparing' approach?
Regards.
"David Lightman Robles" <dlightman@.NOSPAMiname.com> escribió en el mensaje
news:%23AtcAySVFHA.2124@.TK2MSFTNGP14.phx.gbl...
> Thanks for your reply but it seems that there should be another reason.
> Your explanation is on the good road, but
> I have tried your expression, with that 105 varying from 100 to 110 with
> the same results. The red cross is still there.
> Any other suggestion? Regards.
> PS: Just for further debugging, I have an output of the first 950 bytes
> generated by the expression:
> =System.Convert.ToBase64String(Fields!Picture.Value)
> Here they follow:
> FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
>
> "Robert Bruckner [MSFT]" <robruc@.online.microsoft.com> escribió en el
> mensaje news:eL5pK2LVFHA.612@.TK2MSFTNGP12.phx.gbl...
>> This sounds like the images are stored as OLE images in the database
>> (e.g. Access would convert images into OLE images). You can try the
>> following expression to get rid of the OLE chunk:
>> =System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
>> 105))
>> --
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>> "David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
>> news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
>> How should I store an image into my SQL database in order to be able to
>> read it using Reporting Services Image control? I have a table with an
>> image field (datatype of the field is 'Image').
>> I have tried several ways and the report is always rendered with the
>> image showing a red cross inside it (image broken). However if I read
>> the table using MS Access ADP and double click on the image field, MS
>> Paint opens and shows up the image (this is a bmp image). I have also
>> set the MIMEType of the rs image field to 'image/bmp' (filling this
>> field this is compulsory with database images).
>> It seems that, even though the database field contents ('Image' field)
>> are properly stored, Reporting Services does not know how to handle it.
>> May I need to do a CONVERT(Binary, MyImageField) or the database field
>> be of another type? How should I store the image inside the database so
>> that RS could read it?
>> Regards.
>> PS: This is RS SP2.
>>
>|||Instead of doing tests with the final image, I have created a 5x5 pix bitmap
to work/test with.
The Base64 encoding of it (grabbed from an email sourcecode is):
Qk2GAAAAAAAAADYAAAAoAAAABQAAAAUAAAABABgAAAAAAFAAAAAAAAAAAAAAAAAAAAAAAAAA////////////////////AP///wAA/////////wAA/wD///////////////////8A////////AAD/////AAD/AAAA/////////////////wA=
It works perfectly if I set the value property of the rs image to:
=System.Convert.FromBase64String("the former base64 string")
Now, the database version of the same file: I set a texbox in the RS report
and set its value to =System.Convert.ToBase64String(Fields!Picture.Value) so
that I could retrieve the complete base64 of the image stored in the
database. Here it is:
FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAoAAAAEJNhgAAAAAAAAA2AAAAKAAAAAUAAAAFAAAAAQAYAAAAAABQAAAAAAAAAAAAAAAAAAAAAAAAAP///////////////////wD///8AAP////////8AAP8A////////////////////AP///////wAA/////wAA/wAAAP////////////////8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBQAAAAAAAIqtBf4=
By other means, I have been able to revert this base64 string back to binary
and here are the results:
9 + ÿÿÿÿImagen de mapa de bits Paint.Picture PBrush
BM? 6 ( P ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿ
ÿÿÿÿÿÿÿ ÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿ ÿÿÿÿ ÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿ
S þ
Of course, I have some rubbish here. But not everything is lost: Now I can
see that a localized language string is included in the OLE chunk before the
'BM' indicating the begining of the bitmap file. And now the final question:
Should I use other string than
=System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
105))
when the locale of the systems/servers/software is not english? In my case
I'm using spanish and since the string 'Imagen de mapa de bits' is not as
long as 'Bitmap image file', I think that 105 is not valid/correct when
other languages are used.
After some calculations I think that the OLE chunk size for spanish (which
is my case) is 121 instead of 105. However the red cross is still there!!!!!
:(((
Another aproach, instead of letting RS cropping the image ole data, is to
retrieve the image from the database without it. Is it feasible to retrieve
just a 'substring' of the image?
Please help. I really need it. Thaks.
"David Lightman Robles" <dlightman@.NOSPAMiname.com> escribió en el mensaje
news:%23AtcAySVFHA.2124@.TK2MSFTNGP14.phx.gbl...
> Thanks for your reply but it seems that there should be another reason.
> Your explanation is on the good road, but
> I have tried your expression, with that 105 varying from 100 to 110 with
> the same results. The red cross is still there.
> Any other suggestion? Regards.
> PS: Just for further debugging, I have an output of the first 950 bytes
> generated by the expression:
> =System.Convert.ToBase64String(Fields!Picture.Value)
> Here they follow:
> FRw5AAIAAAAXAA4AFAArAP////9JbWFnZW4gZGUgbWFwYSBkZSBiaXRzAFBhaW50LlBpY3R1cmUAAQUAAAIAAAAHAAAAUEJydXNoAAAAAAAAAAAAYEgAAEJNYEgAAAAAAAB2AAAAKAAAAM8AAACxAAAAAQAEAAAAAAAAAAAAEBcAABAXAAAAAAAAAAAAAAAAAAD///8A+vr6APPz8wDn5+cA29vbAMzMzAC5ubkAo6OjAIuLiwBzc3MAWVlZAEJCQgAvLy8AHx8fAA8PDwAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBEREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREQERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERAREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREREBERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERERER
>
> "Robert Bruckner [MSFT]" <robruc@.online.microsoft.com> escribió en el
> mensaje news:eL5pK2LVFHA.612@.TK2MSFTNGP12.phx.gbl...
>> This sounds like the images are stored as OLE images in the database
>> (e.g. Access would convert images into OLE images). You can try the
>> following expression to get rid of the OLE chunk:
>> =System.Convert.FromBase64String(Mid(System.Convert.ToBase64String(Fields!Picture.Value),
>> 105))
>> --
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>> "David Lightman Robles" <dlightman@.NOSPAMiname.com> wrote in message
>> news:e5gQDOJVFHA.584@.TK2MSFTNGP15.phx.gbl...
>> How should I store an image into my SQL database in order to be able to
>> read it using Reporting Services Image control? I have a table with an
>> image field (datatype of the field is 'Image').
>> I have tried several ways and the report is always rendered with the
>> image showing a red cross inside it (image broken). However if I read
>> the table using MS Access ADP and double click on the image field, MS
>> Paint opens and shows up the image (this is a bmp image). I have also
>> set the MIMEType of the rs image field to 'image/bmp' (filling this
>> field this is compulsory with database images).
>> It seems that, even though the database field contents ('Image' field)
>> are properly stored, Reporting Services does not know how to handle it.
>> May I need to do a CONVERT(Binary, MyImageField) or the database field
>> be of another type? How should I store the image inside the database so
>> that RS could read it?
>> Regards.
>> PS: This is RS SP2.
>>
>
Thursday, March 8, 2012
Database Diagram + Reporting Services/Report Builder
If I make a new database, why is it that VS 2005 server explorer can see it, access the tables and stored procs, etc ... but when using Reporting Services/Report Builder after I make the data source and generate the model NOTHING APPEARS in Report Builder (message about "there is no content in this data source")..
now this has been driving me nuts for a few days and the solution was to click on "DataBase Diagram" in Sql Managment studio for that DB and say "Yes" to the dialog that appears?
My question is why is that the case?
Carl
Ping Microsoft.
Is this a bug?
Carl
Wednesday, March 7, 2012
Database Design Theory
I have been tasked with creating a Data Warehouse.
Problem is that old storage vs reporting debate.
I have determined that the data that I will recieve and store will be like follows (simplified form) for expandability
KEY FldKEy FldData DateTime AuditTrail
Daily I will use this data based on use input process this data into the following format and say
if fldkey/ flddata open a cycle.
populate row with null close date
if fldkey/ flddata closes cycle
update row with date
If fldkey/ flddata changes a cutable value
update row
if fldkey/ flddata changes a cutable value (type 2 table)
insert a row into detail update value and obsolete previous row.
KEY DateStart DateEnd FLDDATA1 FLDDATE2 Op_Cl_IND HEADER Record
KEY EFFdate OBSDATE FLDdata3 FLDData4 Detail Records
KEY EFFdate OBSDATE FLDdata3 FLDData4
KEY EFFdate OBSDATE FLDdata3 FLDData4
Problem: FLDKey is a finite count however the max is undefined.
IS there any way to solve the problem of not being able to nail down users to tell you what they want to cut by. What I have been instructed by mgr (old IDMS) is that they wish to see all on the FldData and have the ability to cut by all of it. However the Flddata could be anything (cannot be indexed).
400,000,000 rows at least.
Do I need to nail the users down or am I am missing something.
Sorry if so cryptic
:(Too cryptic, and too much jargon. (Cut?, Cycle?)
But this sure doesn't look like a data warehouse project to me.|||Thought so.
User requirement store a undetermined amount of data about an item
Cannot create a structure with
Key Make Model Year Cost Sold Junked
1 Ford Taurus 97 10000 1/1/98 2/28/06
2 Ford Ranger 97 20000 1/12/99 null
Need to create
Key Fieldname data
1 Make Ford
1 Model Taurus
1 Year 97
1 Cost 10000
1 Sold 1/1/98
1 Junked 2/28/06
As the Number of fields captured is not fixed.
Now I need to sum the that in the data field by a cut of that data.
Total Cost of All 1997 Ford Cars and grouped by the age in months of the auto.
Work of a small table to do this however 400 m rows of data over 18 months Tring to find the data 1997 and Ford in the data field then determining the total dollars of those
Well.
Question is there some thing that I am missing or do I need to get the user to define a more static structure. And transform this into a star schema.
The table structure to store the data (Audit trail)
perhaps datamart is a more appropriate term.|||So you're trying to do the logical vertical table thingee...
Why?
There are sooo many bad reasons for doing this...
The concept is that you want to be able to add new "columns" on the fly
I'll tell you this, if you do go this route, you better make sure to use a partitioned view where the tables are in their own file groups and distributed across many physical disks...
I wonder what you would partition on though|||That is my thought that this a bad idea.
I need to convince my MGR and Users to give me more Defined specs.
Was just asking if there is something that I am missing.
The Goal to the Audit Trail is to capture every poteitial detail of a thing. And to get that info If you have that things ID you can do this. However any and look at every detail about this. the other reason for the data structure of the audit trail is scalability of data storage.
If the users can define the key of a thing and details about that I can use the daily audit file to transpose this information.
I just wanted to make sure that my thoughts were not clouded by preconcieved notions or by lack of knowledge about new techniques.
Thank you|||What you are talking about is known as an EAV (Entity/Attribute/Value) model, and while it is occasionally appropriate, it is very difficult to write code around and I would NEVER recommend it for a "data warehouse".
If you need an unstructured data schema, consider developing in SQL Server 2005 and using the new XML datatype instead of an EAV design.|||Thank You BlindMan for putting a name to my problem. (EAV)
Thank You Brett
I am only using this struture to store an audit trail of a dynamic data structure.
I will persuade the users better to define there business needs so that I may make a true Data Warehouse.
I will use the Audit trail data and evaluate the rows of data that I recieve nighlty to populate the Warehouse. From predifined specs.
I cannot force a change in the data entering the Database.
But once here it is mine all mine.. AH HA HA HA :D|||I think you need to rethink your audit trail. If you are trying to use a single table to store all data changes from any other table, you are going to find the resulting dataset quite unwieldy. Either just store a description of the change that occured, or create separate archive tables for each production to table to store a history of modifications.|||Thank You BlindMan for putting a name to my problem. (EAV)have a look at tony andrews' article OTLT and EAV: the two big design mistakes all beginners make (http://tonyandrews.blogspot.com/2004/10/otlt-and-eav-two-big-design-mistakes.html)
tony's another dbforums stallwart|||To tell the truth...for me, doing audits...simpler is better
Just have an exact copy of the table.
Add 3 columns, HIST_ADD_BY, HIST_ADD_DT, HIST_ADD_TYPE
Create a trigger that inserts into this table for all UPDATE and DELETE Operations and move the entire row
Put no indexes on this table
Boom, audit done
If you want performance on analysis, I'd reccomend that you bcp the data out and load it to a table with indexes (applied after the load)
I would not want to interfere with the triggers at all
MOO|||Thanks all for the reference to the column.
The EAV I am forced to use is a decision of My Management and cannot push them off of that concept. Oh the fate of a peon. I have explained the pros and cons of this decision but this is what has been decided.
The other option that they suggested was to dynamically evaluate the key fields and if a new one appears generate the DDL to add a field to a table of 800+ fields and transpose this data.
They wish to make the data flexible for any forseeable senario without further IT involvment.
If I had total control ....|||They wish to make the data flexible for any forseeable senario without further IT involvment.lol
I've been enjoying the evolution of this thread. I love it when threads like this end with the management concluding that they can conceive of a model that will require no "further IT involvment".
I've never had the misfortune to run into a full blown EAV model (appropriately implemented or not) in the flesh but it's pretty clear with only a little reading and even a substandard imagination like mine that this is precisly where they do not lead you.
Pro - can stick any data in the db
Con - can stick any data in the db
Con - Try getting it out again
"for any forseeable senario" lol.
Ah well - you tried. Best of luck :D|||Put it in writing/e-mail right now that you think XML is the way to go with this. Then save a copy of the document in your CYA file.
Some very complex coding is ahead of you.|||committing to writing that XML is the way to go may backfire on ya...
not that i've got any XML experience, but i've heard horror stories about performance, and since XML has such cachet with management, they may take you up on it and then you could be cooked|||Yes, the performance sucks compared with a standard normalized database, but is probably no worse than an EAV design and with a helluva lot less programming. I would not place data in an XML column unnecessarily, but would reserve it only for data that could not be predefined in the business model.
Problem is that old storage vs reporting debate.
I have determined that the data that I will recieve and store will be like follows (simplified form) for expandability
KEY FldKEy FldData DateTime AuditTrail
Daily I will use this data based on use input process this data into the following format and say
if fldkey/ flddata open a cycle.
populate row with null close date
if fldkey/ flddata closes cycle
update row with date
If fldkey/ flddata changes a cutable value
update row
if fldkey/ flddata changes a cutable value (type 2 table)
insert a row into detail update value and obsolete previous row.
KEY DateStart DateEnd FLDDATA1 FLDDATE2 Op_Cl_IND HEADER Record
KEY EFFdate OBSDATE FLDdata3 FLDData4 Detail Records
KEY EFFdate OBSDATE FLDdata3 FLDData4
KEY EFFdate OBSDATE FLDdata3 FLDData4
Problem: FLDKey is a finite count however the max is undefined.
IS there any way to solve the problem of not being able to nail down users to tell you what they want to cut by. What I have been instructed by mgr (old IDMS) is that they wish to see all on the FldData and have the ability to cut by all of it. However the Flddata could be anything (cannot be indexed).
400,000,000 rows at least.
Do I need to nail the users down or am I am missing something.
Sorry if so cryptic
:(Too cryptic, and too much jargon. (Cut?, Cycle?)
But this sure doesn't look like a data warehouse project to me.|||Thought so.
User requirement store a undetermined amount of data about an item
Cannot create a structure with
Key Make Model Year Cost Sold Junked
1 Ford Taurus 97 10000 1/1/98 2/28/06
2 Ford Ranger 97 20000 1/12/99 null
Need to create
Key Fieldname data
1 Make Ford
1 Model Taurus
1 Year 97
1 Cost 10000
1 Sold 1/1/98
1 Junked 2/28/06
As the Number of fields captured is not fixed.
Now I need to sum the that in the data field by a cut of that data.
Total Cost of All 1997 Ford Cars and grouped by the age in months of the auto.
Work of a small table to do this however 400 m rows of data over 18 months Tring to find the data 1997 and Ford in the data field then determining the total dollars of those
Well.
Question is there some thing that I am missing or do I need to get the user to define a more static structure. And transform this into a star schema.
The table structure to store the data (Audit trail)
perhaps datamart is a more appropriate term.|||So you're trying to do the logical vertical table thingee...
Why?
There are sooo many bad reasons for doing this...
The concept is that you want to be able to add new "columns" on the fly
I'll tell you this, if you do go this route, you better make sure to use a partitioned view where the tables are in their own file groups and distributed across many physical disks...
I wonder what you would partition on though|||That is my thought that this a bad idea.
I need to convince my MGR and Users to give me more Defined specs.
Was just asking if there is something that I am missing.
The Goal to the Audit Trail is to capture every poteitial detail of a thing. And to get that info If you have that things ID you can do this. However any and look at every detail about this. the other reason for the data structure of the audit trail is scalability of data storage.
If the users can define the key of a thing and details about that I can use the daily audit file to transpose this information.
I just wanted to make sure that my thoughts were not clouded by preconcieved notions or by lack of knowledge about new techniques.
Thank you|||What you are talking about is known as an EAV (Entity/Attribute/Value) model, and while it is occasionally appropriate, it is very difficult to write code around and I would NEVER recommend it for a "data warehouse".
If you need an unstructured data schema, consider developing in SQL Server 2005 and using the new XML datatype instead of an EAV design.|||Thank You BlindMan for putting a name to my problem. (EAV)
Thank You Brett
I am only using this struture to store an audit trail of a dynamic data structure.
I will persuade the users better to define there business needs so that I may make a true Data Warehouse.
I will use the Audit trail data and evaluate the rows of data that I recieve nighlty to populate the Warehouse. From predifined specs.
I cannot force a change in the data entering the Database.
But once here it is mine all mine.. AH HA HA HA :D|||I think you need to rethink your audit trail. If you are trying to use a single table to store all data changes from any other table, you are going to find the resulting dataset quite unwieldy. Either just store a description of the change that occured, or create separate archive tables for each production to table to store a history of modifications.|||Thank You BlindMan for putting a name to my problem. (EAV)have a look at tony andrews' article OTLT and EAV: the two big design mistakes all beginners make (http://tonyandrews.blogspot.com/2004/10/otlt-and-eav-two-big-design-mistakes.html)
tony's another dbforums stallwart|||To tell the truth...for me, doing audits...simpler is better
Just have an exact copy of the table.
Add 3 columns, HIST_ADD_BY, HIST_ADD_DT, HIST_ADD_TYPE
Create a trigger that inserts into this table for all UPDATE and DELETE Operations and move the entire row
Put no indexes on this table
Boom, audit done
If you want performance on analysis, I'd reccomend that you bcp the data out and load it to a table with indexes (applied after the load)
I would not want to interfere with the triggers at all
MOO|||Thanks all for the reference to the column.
The EAV I am forced to use is a decision of My Management and cannot push them off of that concept. Oh the fate of a peon. I have explained the pros and cons of this decision but this is what has been decided.
The other option that they suggested was to dynamically evaluate the key fields and if a new one appears generate the DDL to add a field to a table of 800+ fields and transpose this data.
They wish to make the data flexible for any forseeable senario without further IT involvment.
If I had total control ....|||They wish to make the data flexible for any forseeable senario without further IT involvment.lol
I've been enjoying the evolution of this thread. I love it when threads like this end with the management concluding that they can conceive of a model that will require no "further IT involvment".
I've never had the misfortune to run into a full blown EAV model (appropriately implemented or not) in the flesh but it's pretty clear with only a little reading and even a substandard imagination like mine that this is precisly where they do not lead you.
Pro - can stick any data in the db
Con - can stick any data in the db
Con - Try getting it out again
"for any forseeable senario" lol.
Ah well - you tried. Best of luck :D|||Put it in writing/e-mail right now that you think XML is the way to go with this. Then save a copy of the document in your CYA file.
Some very complex coding is ahead of you.|||committing to writing that XML is the way to go may backfire on ya...
not that i've got any XML experience, but i've heard horror stories about performance, and since XML has such cachet with management, they may take you up on it and then you could be cooked|||Yes, the performance sucks compared with a standard normalized database, but is probably no worse than an EAV design and with a helluva lot less programming. I would not place data in an XML column unnecessarily, but would reserve it only for data that could not be predefined in the business model.
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