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Posted on 2012-03-26
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Last Modified: 2012-04-05
How to delete all data in sql in one click?
This is most likely related with my pending question which is now still searching for the solution. The XAML.cs here are as follows

StudentDomainContext objctx;

private void btndelete_Click(object sender, RoutedEventArgs e)
{
objctx = new StudentDomainContext();
var query = objctx.GetStudentsQuery();
objctx.Load(query, Datadelete, null);
}

private void Datadelete(LoadOperation<student> lo)
{
student st = lo.Entities.First();
objctx.student.Remove(st);
try
{
objctx.SubmitChanges();
MessageBox.Show("Data deleted!")
}
catch (Exception ex)
{
MessageBox.Show("Data deletion failed" +ex.Message);
}

}

The Class query are as follos......
public IQueryable<student> GetStudents()
{
return this.ObjectContext.students;
}

The codes are working but when I execute, only one data will be deleted. What I want here is to delete all datas inside my database concerning student Table. Please Help!
0
Comment
Question by:Whing Dela Cruz
  • 4
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7 Comments
 
LVL 15

Assisted Solution

by:angus_young_acdc
angus_young_acdc earned 500 total points
ID: 37765245
It is because you are only selecting the first value on this line: student st = lo.Entities.First();

Try changing it to lo.Entities.All();
0
 
LVL 15

Expert Comment

by:angus_young_acdc
ID: 37765249
Or change the query to DELETE FROM [YourStudentTableName]

If there is no Where clause then it will delete everything in that table.
0
 

Author Comment

by:Whing Dela Cruz
ID: 37765317
Hi! I tried this lo.Entities.All(); but it doesn't work! Can you provide me how to change the query?
0
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LVL 15

Expert Comment

by:angus_young_acdc
ID: 37765321
var query = objctx.GetStudentsQuery();


The above line should be returning your query (from what I can work out from the amount of code), within the GetStudentsQuery method you should see what is happening and be able to update it accordingly.
0
 

Author Comment

by:Whing Dela Cruz
ID: 37766572
Hi! I'm trying but it does'nt work...
0
 

Accepted Solution

by:
Whing Dela Cruz earned 0 total points
ID: 37769624
Hi! Everyone, What I did here is to put something Loop... But I dought if it is good I dea because I feel that there's something delay of the Looping. Any Idea Please....

private void Datadelete(LoadOperation<student> lo)
{
foreach (student st in lo.Entities)
objctx.student.Remove(st);
try
{
objctx.SubmitChanges();
MessageBox.Show("Data deleted!")
}
catch (Exception ex)
{
MessageBox.Show("Data deletion failed" +ex.Message);
}

}

 Please tell me if there is another solution aside from this....
0
 

Author Closing Comment

by:Whing Dela Cruz
ID: 37810117
Thanks!
0

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