Monday, 10 June 2013
Custom SQL exceptions (error messages) to end users
Protected Sub FormView_Paper_ItemInserted(sender As Object, e As FormViewInsertedEventArgs) Handles FormView_Paper.ItemInserted
If Not IsNothing(e.Exception) Then
Dim DoDisplayCustomError As Boolean = False
Dim SQLError As System.Data.SqlClient.SqlException
If e.Exception.Source = ".Net SqlClient Data Provider" Then
SQLError = DirectCast(e.Exception, SqlException)
If SQLError.ErrorCode = -2146232060 Then
DoDisplayCustomError = True
' Develop ur message display function!
Me.CurrentMasterPage.DisplayError("Missing Mandatory fields", "Fill in all mandatory fields.")
End If
End If
If Not DoDisplayCustomError Then
Me.CurrentMasterPage.DisplayError(e.Exception)
End If
e.ExceptionHandled = True
e.KeepInInsertMode = True
Else
Response.Redirect("OtherPage.aspx")
End If
End Sub
If Not IsNothing(e.Exception) Then
Dim DoDisplayCustomError As Boolean = False
Dim SQLError As System.Data.SqlClient.SqlException
If e.Exception.Source = ".Net SqlClient Data Provider" Then
SQLError = DirectCast(e.Exception, SqlException)
If SQLError.ErrorCode = -2146232060 Then
DoDisplayCustomError = True
' Develop ur message display function!
Me.CurrentMasterPage.DisplayError("Missing Mandatory fields", "Fill in all mandatory fields.")
End If
End If
If Not DoDisplayCustomError Then
Me.CurrentMasterPage.DisplayError(e.Exception)
End If
e.ExceptionHandled = True
e.KeepInInsertMode = True
Else
Response.Redirect("OtherPage.aspx")
End If
End Sub
Maintain FormView values on validation errors
Protected Sub FormView_Paper_ItemInserted(sender As Object, e As FormViewInsertedEventArgs) Handles FormView_Paper.ItemInserted
If Not IsNothing(e.Exception) Then
e.ExceptionHandled = True
e.KeepInInsertMode = True
End If
End Sub
If Not IsNothing(e.Exception) Then
e.ExceptionHandled = True
e.KeepInInsertMode = True
End If
End Sub
Sunday, 9 June 2013
Generating a sequence of numbers using SQL Select statement
SELECT (Tens.N + Units.N) NN
FROM
(
SELECT 0 N
UNION SELECT 1 N
UNION SELECT 2 N
UNION SELECT 3 N
UNION SELECT 4 N
UNION SELECT 5 N
UNION SELECT 6 N
UNION SELECT 7 N
UNION SELECT 8 N
UNION SELECT 9 N
)Units
CROSS JOIN
(
SELECT 0 N
UNION SELECT 10 N
--UNION SELECT 20 N
--UNION SELECT 30 N
--UNION SELECT 40 N
--UNION SELECT 50 N
--UNION SELECT 60 N
--UNION SELECT 70 N
--UNION SELECT 80 N
--UNION SELECT 90 N
)Tens
-----
NN
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Thanks for:
http://sqlmag.com/t-sql/generating-sequences-t-sql
FROM
(
SELECT 0 N
UNION SELECT 1 N
UNION SELECT 2 N
UNION SELECT 3 N
UNION SELECT 4 N
UNION SELECT 5 N
UNION SELECT 6 N
UNION SELECT 7 N
UNION SELECT 8 N
UNION SELECT 9 N
)Units
CROSS JOIN
(
SELECT 0 N
UNION SELECT 10 N
--UNION SELECT 20 N
--UNION SELECT 30 N
--UNION SELECT 40 N
--UNION SELECT 50 N
--UNION SELECT 60 N
--UNION SELECT 70 N
--UNION SELECT 80 N
--UNION SELECT 90 N
)Tens
-----
NN
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Thanks for:
http://sqlmag.com/t-sql/generating-sequences-t-sql
Saturday, 8 June 2013
Feature I would like to see in: my mobile device
Token generator application for accessing the corporate VPN network, rather than having to hold another piece of H\W with me everywhere just for this purpose!!
Wednesday, 5 June 2013
SQL: Get aggregates for multiple values from the same table
Table Doc
-- --
1 1
1 2
1 3*
2 1
2 2*
3 1
3 2*
4 1
4 2
4 3
4 4*
5 1*
To get maximum versions for each document
SELECT D.ID, D.Version
FROM Doc D
INNER JOIN (SELECT ID, MAX(Version) FROM Doc GROUP BY ID) DM ON D.ID = DM.ID
Thanks Dinos for the inspiration!
Tuesday, 4 June 2013
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