I feel like this has to be somewhat of a common question, however I cannot seem to find the answer via search, so here goes:
We just moved all of our tables to a SQL Server backend and are looking to continue using MS Access as a frontend because of the friendly UI. We do, however, have a couple of tables that use the AutoNumber type which I have learned SQL Server simply converted to the "bigint" data type.
Now, I've already figured out how to make views that utilize the "CAST" function to convert away from "bigint" when I am linking my tables from the backend (this is so that MS ACCESS can read the tables rather than giving me #deleted values), however this leaves my tables of course with no AutoNumber option still. Is there a solution to this? I'd really like to continue using an auto incremental column to be used as a PK for our purposes with these tables.
Thanks for any/all help. It's greatly appreciated
Setting Identity to true with an int type is the same as autonumber.
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I'm building my first big application using React. I built with Express
a Restful API to get and update data on a MySQL DB.
There is a moment when I need to get data from different tables in the same moment and populate different tables on the same page.
Is it correct to make multiple calls at the same moment? Can this cause problems?
Is there a better way to do this, like creating a dedicated API to get all the data?
I apologize in advance if there is something wrong or I was unclear
Yes you could do that, but only if you are doing something ( changing Data or selecting Data ) from another Table example: Table1 apicall1 and Table2 apicall2.
If its from the same table its probably gonna screw something up if you change something big!
I'm in a VERY difficult problem.
I have a Microsoft Access Data Base, but it was made in the most chaotic way possible. The DB has like 150+ tables, Only uses like 50% of the tables. The relations are almost random. But, somehow, it delivers some information.
I need to get a particular component of the DB, but is so tangled that I can not manage to get into the table that creates that value. I revised every table, one by one, and found nothing.
I used mdbtools for Linux to try to inspect with more details the DB. But unfortunately has not been developed in years, and it closes every time. Maybe because the DB is "big" ? -700 mg-
I'm wondering: is there a way to see all the relations the arrives to the particular value I'm looking? Or to decompile the DB? I have no idea in which language it was made. I'm suspecting that it was made in Visual, just because is rather crappy.
Well, waiting for some help.
I would suggest using (still) MS Access for this. But, if relationships look messy on the diagram, you can query one of the system tables (MSysRelationships) directly to get ALL the relationships you need (e.g. for particular table etc.):
To unhide system tables in early versions of Access (97-2003), follow the instructions here:
For Access 2007, do the following:
Sorry if this sounds like a rather dumb question but I would like to do a "select" on data from a Windows Azure table. I tried the following and it worked:
from question in _statusTable.GetAll()
where status.RowKey.StartsWith(name)
I then tried
from question in _statusTable.GetAll()
where status.Description.StartsWith(name)
This one gave me nothing. Can anyone explain to me if or how I can query on rows that are not part of the RowKey or PartitionKey.
You can query on any property, but the types of query supported are limited - e.g. StartsWith isn't supported. Also if you aren't querying on PartitionKey and RowKey, then there are some very important performance issues to understand - and you always need to be aware of ContinuationToken's - almost any query result can contain these.
You can see the sorts of queries supported by looking at the REST API: http://msdn.microsoft.com/en-us/library/dd894031.aspx - it's pretty limited (but quick as a result):
Equal
GreaterThan
GreaterThanOrEqual
LessThan
LessThanOrEqual
NotEqual
If you need to do more, then:
you can mimic things like StartsWith("Fred") by doing a GreaterThanOrEqualTo("Fred") and LessThan("Free")
or client side filtering will work - but that means pulling back all the rows from the storage - which could be a lot of data and which could be computationally and transactionally expensive!
What does GetAll() do? StartsWith isn't supported by WA tables, so I'm assuming GetAll pulls all the data local, and so your query is done over objects in memory. If so, this has nothing to do with Windows Azure, so I'd take a look at whether your data looks like you expect it to.
I'm evaluating SubSonic 3.0 for use in our business as a replacement for our POCO objects. I'm new to SubSonic, literally installing it yesterday. I've gotten to the point where I can connect to one database using the 3.0 LINQ T4 Templates, and have been wooed by the promise of being able to connect to multiple databases in one application using SubSonic.
My issue is I can't find any documentation on how to use the T4 Templates with multiple databases (e.g. adding another connection string, setting up the Settings.ttinclude etc).
I've searched Google and Stackoverflow for an answer to see how this would be done or if its even possible. Any help would be appreciated.
So I seemed to be able to make it work by adding another connectionString to the web.config, and then adding a 2nd set of templates for that connectionString, it works, but it doesn't seem 'clean' or even really that DRY to me.
It also seems that I could do almost the same thing with the .NET Built in LINQ by adding multiple .dbml files.
Can anyone give me some reasoning at this point why we shouldn't just use the built in LINQ support over a 3rd party ORM like SubSonic?
Cross posting from the subsonic mailing list:
Oh yeah I do this all the time, the trick is two copies of the templates(easy) or editing the templates to iterate over two sets of tables(harder). In the second settings.tt change the name of the connection string to reflect the other database. You might also want to change the namespace so that you don't have conflicts where table names are the same. It seems hacky but I don't think it is because it allows you to make changes to the templates for each database independently.
If you really want only one set of templates the easiest way to go about it is to edit SQLServer.tt (or your choice of database) and override how LoadTables works such that it will accept a list of connections rather than a single one. I have to say this is a pain and it is going to be much harder than having 2 copies of the files.
(In reply to your answer of your question)
Can anyone give me some reasoning at this point why I shouldn't just use the built in LINQ over a 3rd party ORM like SubSonic?
On immediate thought: SubSonic supports more than just Microsoft Sql Server.
I run a sports program where i have a master roll of who is in which class in excel. I want to link this to a database in access that stores the other information about each athlete, e.g. address, parents name, school, medical details. I want to be able to add names to class in the excel speadsheet and have this automatically generate a record for that person in access. There also needs to be some failsafe for athletes that are in multiple classes. I was also doing class roles as pivot tables out of the access database so i need to code for classes and also have this allow for athletes in multiple classes/disciplines.
It is easy enough to update an Access table from Excel via ADO, after that it is very much about your tables and indexes. If you are not familiar with relational databases, you might like to read http://r937.com/relational.html. That being said, it would be a lot easier to work in Access and output to Excel when necessary.
I agree I think this is a classic case of trying to get excel to do something its not best for. If you try to create some kind of hybrid system with excel pushing data into access then it will end in tears at some point.
The best thing in this case would be to port the whole thing to some kind of database. If the number of uses and the usage falls into the range for access/jet then that would be a great choice. If more users/higher usage is going to be needed then maybe look to SQL express to hold the data and access as a front end.
There was a thread a few days ago about someone being sick when maintaining an access DB, he wanted to rewrite it in .net. The point of that thread boiled down to using the correct tool for the correct job. No one can blankly say “Access sucks, everything should be in SQL server/.net” because if used in the correct way and for the correct projects access is a great tool.
So to bring it back to this thread it looks like you have “outgrown” excel and should be looking at some kind of database with access being a strong candidate
If you want to display the data in Excel (so you can do sorts, filters, etc.) then you could store the data in Access as has been suggested, then instead of exporting a report every time you want to use it, link your Excel file to Access using a Database Query.
In Excel 2003 go to Data->Import External Data->New Database Query and create a new data source to your Access mdb.
That way your data is stored in a much better way, whilst still having the Excel viewability that everyone(?) loves.