Question

Deleting rows from two DataTables based on related data

Asked by: justjuice

Hi Experts. I am new to ASP.NET, so please be gentle!

Assuming I have two identically strcutured DataTables each populated with slightly different data, what would be the most efficient way of doing the following?:-

1) Delete all rows from table B that don't have similar entries in table A

once that is done, then

2) Delete all rows from table A that do have similar entries in table B

I have already got this working using loops and popluating copies of the datatables etc, but i wondered if there is a more efficient way, maybe using DataSet relations?

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Asked On
2006-07-13 at 12:03:37ID21918600
Topic

Programming for ASP.NET

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: deanvanrooyenPosted on 2006-07-13 at 12:32:03ID: 17102848

thats interesting, I am also new to datarelation but this is my opinion
usualy I use the datarealtion like so, if you were to use it to do what you are thinking it should work but how are you going to update the database? - do you need to update the db?

idea here logically using a normal way
table name
id    name
1     steve
2     ben

table phone
id    nameid   phone
1      2           70...
2      1           70...

and then  relate name to phone on  name id and phone nameid,

generally like so
            DataRelation sectquery = new DataRelation("sectquery",Tables["name"].Columns["id"], Tables["phone"].Columns["nameid"]);

             foreach (DataRow r in Tables["name"].Rows)
            {
                      DataRow[] childrows = r.GetChildRows("sectquery");
                     foreach (DataRow cr in childrows)
                    {
                        ... do something
                    }
            }

in winforms this work like a charm the datasource is "conected" to the db ,but with asp.net, I am not sure how you are currently updating the database, you would still have to manually check what records are gone etc, the db is disonnected from the dataset, it might be easier to do what you are doing, maybe you could use the same process but optimise it(if it can be done)... are you checking the datasets and then manually firing sql to the db?

what do you think?

20120131-EE-VQP-002

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