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VB.net automatically detect SQL table relationships

Hi

I have a SQL database where relationships have been set up between all the tables.
I want to allow the user of my VB.net app to select columns from multiple tables, where
the table relationships are automatically detected and used in the code to pull the data
through to a DataGridView. How do I achieve this? Do I use a DataSet?
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Murray Brown
Asked:
Murray Brown
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1 Solution
 
Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
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Fernando SotoCommented:
First you need to decide on which technology you will be using to access the database? For example Standard ADO .Net, Linq to Sql or Linq to Entity Framework?

Which SQL server are you using?

To your statement, "I want to allow the user of my VB.net app to select columns from multiple tables, where
the table relationships are automatically detected and used in the code to pull the data
through to a DataGridView", this is not done automatically for you. You will need to build a SQL statement for each request that will return the needed fields / columns back from the desired tables.
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Hi Phillip. Thanks for referencing my other question. I hadn't realised that table relations could be added to a dataset until today so I am happy to find that there is a a different route
Hi Fernando. I am using the sqlclient namespace in I think ADO.net. My database is a sql server 2008 database
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
So what is the best way to pull multiple joined table data through in VB.net. I also want my users to be able to name and save a view for each scenario
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Fernando SotoCommented:
As I stated earlier there is no programming option that will do that automatically for you. Seeming that you want to allow the user to pick and choose which columns to download from the tables, joined or not, you will need to formulate a SQL statement that will query the database and bring down the wanted information, which will not be an easy feat. This means that the application must have a very good knowledge of the database structure, for example what columns are in what table they are in and if multiple tables are involved how to join the two between the two or more tables.

Here is a class that will help to do what you need a little easier and can be found on GitHub, DbExtensions SqlBuilder. I have not used this code before an so I can not say how well it performs. I understand that this code can be downloaded into your application using NuGet
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks very much Fernando. I appreciate the help
Murray
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Fernando SotoCommented:
Not a problem Murray, glad to help.
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