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09/05/2006 at 02:45PM PDT, ID: 21979017
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8.0

Data Tables, querying using SQL and returning results to a new data table.

Asked by NeilGrant in Microsoft Visual Basic.Net

Tags: data, datatables, from, sql, table

Hi,

I am working with a windows application and I have a dataset with several datatables loaded from individual tables of an Access database.  I want to be able to create other datatables in the dataset that have the results of a "relational" SQL query on the existing datatables.   Then I will use the resulting datatable as a datasource for a binding which is in turn a datasource for a datagridview that users work with.

So, for example, if I have a datatable called Users with a field called StateID and a datatable called States with fields StateID and StateName I want to run a SQL command like

    SELECT Users.*, States.StateName FROM Users, States WHERE Users.StateID = States.StateID

then return the results to a new datatable in the dataset.

I can get the results I want by using a dataadapter for each relational query, however this means connecting back to the database all the time for reading and writing.  My cunning plan is to avoid this (due to slow network links) and allow the user to load the data they need once, then create additional datatables as required in memory to hold the related data.  As the users make changes, I will do the updating back to the memory based datatables that were loaded using dataadapters.  When appropriate I will use the update command of the dataadapters to get all the results back to the database.

I have looked at adding a relation to the dataset but this doesn't seem to be able to produce a datasource that will display in a datagrid view as described in my example above.

So as always any help welcome.

Neil
[+][-]09/06/06 03:48 AM, ID: 17461973

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[+][-]09/07/06 01:27 AM, ID: 17468903

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About this solution

Zone: Microsoft Visual Basic.Net
Tags: data, datatables, from, sql, table
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Solution Provided By: graye
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09/13/06 08:45 PM, ID: 17517598

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