Question

Datagrid refresh issue

Asked by: FMabey

Hi all,

I'm using VB.NET (VS 2003) and SQL Server 2000.

I am running the following select command upon opening my form so to populate a datagrid:

        SqlConnection1.Open()
        SqlCommand1.Parameters("@Cont").Value = "" & PUB_Cont & ""
        SqlCommand1.Parameters("@Str").Value = "" & PUB_Str & ""
        SDA_plates.SelectCommand = SqlCommand1
        SqlCommand1.ExecuteNonQuery()
        SDA_plates.Fill(DS_plates1)

This works fine. However, when I add a row of data to the datagrid I run the following code which fails:

SDA_plates.Update(DS_plates1.GetChanges())
        SqlConnection1.Open()
        SqlCommand1.Parameters("@Cont").Value = "" & PUB_Cont & ""
        SqlCommand1.Parameters("@Str").Value = "" & PUB_Str & ""
        SDA_plates.SelectCommand = SqlCommand1
        SqlCommand1.ExecuteNonQuery()
        SDA_plates.Fill(DS_plates1)

I get the following error:

An unhandled exception of type 'System.Data.ConstraintException' occurred in system.data.dll

Additional information: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.


This would indicate that I am breaking a constraint set on the database table? However, when I look in the table all data on the row in question looks fine. Infact, when I go back into the form it opens fine showing the relevant row (no error). I do have a few formulas working in the table which calculate costs, areas, weights etc... from data held in other fields... Could this be causing the problem?

Cheers

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Asked On
2007-08-06 at 03:00:39ID22743662
Tags

datagrid

,

refresh

,

enable

,

failed

Topics

Microsoft Visual Basic.Net

,

VB Database Programming

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: FMabeyPosted on 2007-08-06 at 03:20:47ID: 19637212

I have now tested the code with all formula removed and all fields allowing nulls (apart from the 1 key field) and I still get the error. This seems to indicate that the key field is the problem. But it is not breaking any unique constraint rules.

Any ideas anyone?

 

by: NickGeorghiouPosted on 2007-08-06 at 03:30:42ID: 19637243

Hi FMabey,

Do you start with an empty database everytime you run the app? Is it simply that you are trying to add the same row to the database that is already in there? This would cause primary key error.

Delete the row from the database and then re-run...?

Nick

 

by: TheLearnedOnePosted on 2007-08-06 at 03:32:41ID: 19637247

Try this:

DS_plates1.EnforceConstraints = False
SDA_plates.Fill(DS_plates1)
DS_plates1.EnforceConstraints = True

Bob

 

by: FMabeyPosted on 2007-08-06 at 03:33:11ID: 19637251

The actual update itself is running fine. It's when I try and reload the datagrid that I'm gettting the error. If I come out of the form and let exaclty the same code run upon entry, the datagrid loads fine with exactly the same data.

 

by: FMabeyPosted on 2007-08-06 at 03:36:37ID: 19637261

Bob,

I still get the error... This time when I turn the contraints back on!

 

by: TheLearnedOnePosted on 2007-08-06 at 03:40:14ID: 19637271

Right, it's because you haven't cleared the DataSet, before calling the Fill again, so you get the same records again.

Bob

 

by: FMabeyPosted on 2007-08-06 at 03:43:26ID: 19637280

How do I clear the dataset?

 

by: FMabeyPosted on 2007-08-06 at 03:48:48ID: 19637300

Excellent, thanks Bob.

I used DS_plates1.clear() and it worked a treat!

20120131-EE-VQP-002

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