Setting Up/accesing Database In VB Codebehind

Jul 9, 2006

Hey All,

I'm very new to ASP.NET and have recently begun using the databinding functionality.  So far, all I've had to do is drag and drop the various controls and then use the data source wizard to set up an appropriate query.  However, now I've got a bit of a different need.  In the VB codebehind, i need to be able to ask whether something is true in the database, and then if it is, carry out functions.  So, for example, what I need to do is:

if (SQLStatement "Select charttype FROM charts WHERE datasource = " & dropdownlist1.selecteditem.tostring()) Then

'do whatever

end if

Trouble is, I don't know how I would go about binding the data so that I could access it in this way.  Any guidance would be very much appreciated. 

Thanks,
J Rankin  

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CODE - Hangman.aspx.vb
1        Protected Sub UpdateStats()2            Dim playeridString As String3            Dim gamesplayedInteger, gameswonInteger, _4                easygamesplayedInteger, easygameswonInteger, _5                mediumgamesplayedInteger, mediumgameswonInteger, _6                hardgamesplayedInteger, hardgameswonInteger As Int327    8            ' determine whether player is named or anonymous9            If User.Identity.IsAuthenticated Then10               Profile.Item("hangmanplayeridString") = User.Identity.Name11           Else12               Profile.Item("hangmanplayeridString") = "Anonymous"13           End If14   15           playeridString = Profile.Item("hangmanplayeridString")16   17           ' look up record in stats database18           Dim hangmanstatsDataView As System.Data.DataView = CType(statsSqlDataSource.Select(DataSourceSelectArguments.Empty), System.Data.DataView)19   20           gamesplayedInteger = 021           gameswonInteger = 022           easygamesplayedInteger = 023           easygameswonInteger = 024           mediumgamesplayedInteger = 025           mediumgameswonInteger = 026           hardgamesplayedInteger = 027           hardgameswonInteger = 028   29           If hangmanstatsDataView.Table.Rows.Count = 0 Then30   31               '   then create record with 0 values32               statsSqlDataSource.InsertParameters.Clear() ' don't really know what Clear does33               statsSqlDataSource.InsertParameters("playerid").DefaultValue = playeridString34               statsSqlDataSource.InsertParameters("GamesPlayed").DefaultValue = gamesplayedInteger35               statsSqlDataSource.InsertParameters("GamesWon").DefaultValue = gameswonInteger36               statsSqlDataSource.InsertParameters("EasyGamesPlayed").DefaultValue = easygamesplayedInteger37               statsSqlDataSource.InsertParameters("EasyGamesWon").DefaultValue = easygameswonInteger38               statsSqlDataSource.InsertParameters("MediumGamesPlayed").DefaultValue = mediumgamesplayedInteger39               statsSqlDataSource.InsertParameters("MediumGamesWon").DefaultValue = mediumgameswonInteger40               statsSqlDataSource.InsertParameters("HardGamesPlayed").DefaultValue = hardgamesplayedInteger41               statsSqlDataSource.InsertParameters("HardGamesWon").DefaultValue = hardgameswonInteger42   43               statsSqlDataSource.Insert()44           End If45   46           ' reread the record to get current values47           hangmanstatsDataView = CType(statsSqlDataSource.Select(DataSourceSelectArguments.Empty), System.Data.DataView)48           Dim hangmanstatsDataRow As System.Data.DataRow = hangmanstatsDataView.Table.Rows.Item(0)49   50           ' set temp variables to database values51           gamesplayedInteger = hangmanstatsDataRow("GamesPlayed")52           gameswonInteger = hangmanstatsDataRow("GamesWon")53           easygamesplayedInteger = hangmanstatsDataRow("EasyGamesPlayed")54           easygameswonInteger = hangmanstatsDataRow("EasyGamesWon")55           mediumgamesplayedInteger = hangmanstatsDataRow("MediumGamesPlayed")56           mediumgameswonInteger = hangmanstatsDataRow("MediumGamesWon")57           hardgamesplayedInteger = hangmanstatsDataRow("HardGamesPlayed")58           hardgameswonInteger = hangmanstatsDataRow("HardGamesWon")59   60           ' update stats record61           'statsSqlDataSource.UpdateParameters.Clear()62           'statsSqlDataSource.UpdateParameters("playerid").DefaultValue = playeridString63   64           If Profile.Item("hangmanwinorloseString") = "win" Then65   66               statsSqlDataSource.UpdateParameters("GamesPlayed").DefaultValue = gamesplayedInteger + 167               statsSqlDataSource.UpdateParameters("GamesWon").DefaultValue = gameswonInteger + 168               Select Case Profile.Item("hangmandifficultyInteger")69                   Case 170                       statsSqlDataSource.UpdateParameters("EasyGamesPlayed").DefaultValue = easygamesplayedInteger + 171                       statsSqlDataSource.UpdateParameters("EasyGamesWon").DefaultValue = easygameswonInteger + 172                   Case 273                       statsSqlDataSource.UpdateParameters("MediumGamesPlayed").DefaultValue = mediumgamesplayedInteger + 174                       statsSqlDataSource.UpdateParameters("MediumGamesWon").DefaultValue = mediumgameswonInteger + 175                   Case 376                       statsSqlDataSource.UpdateParameters("HardGamesPlayed").DefaultValue = hardgamesplayedInteger + 177                       statsSqlDataSource.UpdateParameters("HardGamesWon").DefaultValue = hardgameswonInteger + 178               End Select79   80   81           ElseIf Profile.Item("hangmanwinorloseString") = "lose" Then82   83               statsSqlDataSource.UpdateParameters("GamesPlayed").DefaultValue = gamesplayedInteger + 184               Select Case Profile.Item("hangmandifficultyInteger")85                   Case 186                       statsSqlDataSource.UpdateParameters("EasyGamesPlayed").DefaultValue = easygamesplayedInteger + 187                   Case 288                       statsSqlDataSource.UpdateParameters("MediumGamesPlayed").DefaultValue = mediumgamesplayedInteger + 189                   Case 390                       statsSqlDataSource.UpdateParameters("HardGamesPlayed").DefaultValue = hardgamesplayedInteger + 191               End Select92           End If93   94           statsSqlDataSource.Update()95   96       End Sub97  
CODE - Hangman.aspx 1 <asp:SqlDataSource ID="statsSqlDataSource" runat="server" ConflictDetection="overwritechanges"
2 ConnectionString="<%$ ConnectionStrings:lambanConnectionString %>" DeleteCommand="DELETE FROM [Hangman_Stats] WHERE [PlayerID] = @original_PlayerID AND [GamesPlayed] = @original_GamesPlayed AND [GamesWon] = @original_GamesWon AND [EasyGamesPlayed] = @original_EasyGamesPlayed AND [EasyGamesWon] = @original_EasyGamesWon AND [MediumGamesPlayed] = @original_MediumGamesPlayed AND [MediumGamesWon] = @original_MediumGamesWon AND [HardGamesPlayed] = @original_HardGamesPlayed AND [HardGamesWon] = @original_HardGamesWon"
3 InsertCommand="INSERT INTO [Hangman_Stats] ([PlayerID], [GamesPlayed], [GamesWon], [EasyGamesPlayed], [EasyGamesWon], [MediumGamesPlayed], [MediumGamesWon], [HardGamesPlayed], [HardGamesWon]) VALUES (@PlayerID, @GamesPlayed, @GamesWon, @EasyGamesPlayed, @EasyGamesWon, @MediumGamesPlayed, @MediumGamesWon, @HardGamesPlayed, @HardGamesWon)"
4 OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT PlayerID, GamesPlayed, GamesWon, EasyGamesPlayed, EasyGamesWon, MediumGamesPlayed, MediumGamesWon, HardGamesPlayed, HardGamesWon FROM Hangman_Stats WHERE (PlayerID = @playerid)"
5 UpdateCommand="UPDATE [Hangman_Stats] SET [GamesPlayed] = @GamesPlayed, [GamesWon] = @GamesWon, [EasyGamesPlayed] = @EasyGamesPlayed, [EasyGamesWon] = @EasyGamesWon, [MediumGamesPlayed] = @MediumGamesPlayed, [MediumGamesWon] = @MediumGamesWon, [HardGamesPlayed] = @HardGamesPlayed, [HardGamesWon] = @HardGamesWon WHERE [PlayerID] = @original_PlayerID AND [GamesPlayed] = @original_GamesPlayed AND [GamesWon] = @original_GamesWon AND [EasyGamesPlayed] = @original_EasyGamesPlayed AND [EasyGamesWon] = @original_EasyGamesWon AND [MediumGamesPlayed] = @original_MediumGamesPlayed AND [MediumGamesWon] = @original_MediumGamesWon AND [HardGamesPlayed] = @original_HardGamesPlayed AND [HardGamesWon] = @original_HardGamesWon">
6 <DeleteParameters>
7 <asp:Parameter Name="original_PlayerID" Type="String" />
8 <asp:Parameter Name="original_GamesPlayed" Type="Int32" />
9 <asp:Parameter Name="original_GamesWon" Type="Int32" />
10 <asp:Parameter Name="original_EasyGamesPlayed" Type="Int32" />
11 <asp:Parameter Name="original_EasyGamesWon" Type="Int32" />
12 <asp:Parameter Name="original_MediumGamesPlayed" Type="Int32" />
13 <asp:Parameter Name="original_MediumGamesWon" Type="Int32" />
14 <asp:Parameter Name="original_HardGamesPlayed" Type="Int32" />
15 <asp:Parameter Name="original_HardGamesWon" Type="Int32" />
16 </DeleteParameters>
17 <UpdateParameters>
18 <asp:Parameter Name="GamesPlayed" Type="Int32" />
19 <asp:Parameter Name="GamesWon" Type="Int32" />
20 <asp:Parameter Name="EasyGamesPlayed" Type="Int32" />
21 <asp:Parameter Name="EasyGamesWon" Type="Int32" />
22 <asp:Parameter Name="MediumGamesPlayed" Type="Int32" />
23 <asp:Parameter Name="MediumGamesWon" Type="Int32" />
24 <asp:Parameter Name="HardGamesPlayed" Type="Int32" />
25 <asp:Parameter Name="HardGamesWon" Type="Int32" />
26 <asp:Parameter Name="original_PlayerID" Type="String" />
27 <asp:Parameter Name="original_GamesPlayed" Type="Int32" />
28 <asp:Parameter Name="original_GamesWon" Type="Int32" />
29 <asp:Parameter Name="original_EasyGamesPlayed" Type="Int32" />
30 <asp:Parameter Name="original_EasyGamesWon" Type="Int32" />
31 <asp:Parameter Name="original_MediumGamesPlayed" Type="Int32" />
32 <asp:Parameter Name="original_MediumGamesWon" Type="Int32" />
33 <asp:Parameter Name="original_HardGamesPlayed" Type="Int32" />
34 <asp:Parameter Name="original_HardGamesWon" Type="Int32" />
35 </UpdateParameters>
36 <InsertParameters>
37 <asp:Parameter Name="PlayerID" Type="String" />
38 <asp:Parameter Name="GamesPlayed" Type="Int32" />
39 <asp:Parameter Name="GamesWon" Type="Int32" />
40 <asp:Parameter Name="EasyGamesPlayed" Type="Int32" />
41 <asp:Parameter Name="EasyGamesWon" Type="Int32" />
42 <asp:Parameter Name="MediumGamesPlayed" Type="Int32" />
43 <asp:Parameter Name="MediumGamesWon" Type="Int32" />
44 <asp:Parameter Name="HardGamesPlayed" Type="Int32" />
45 <asp:Parameter Name="HardGamesWon" Type="Int32" />
46 </InsertParameters>
47 <SelectParameters>
48 <asp:ProfileParameter Name="playerid" PropertyName="hangmanplayeridString" />
49 </SelectParameters>
50 </asp:SqlDataSource>
 

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cn.Open "Driver={SQL Server};Server=SQLinstance;Address=localhost,port;Database=;Uid=;Pwd="

To top things out the web server is configured to send out a generic error message, so I can't see what the error I'm getting actually is...

Any thoughts ?

Thanks.

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Setting Password For Each Database

Jul 23, 2005

Hi,When I create a new database from Enterprise Manager (right click ondatabases > New Database) I noticed that I am not prompted to create apassword or user name. Can I take it then that all databases under thesame local group will have the same password and user name?I have tied to access the newly created database using the samepassword and username but haven't had any luck.Thanks

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Setting Up Database Snapshot

Oct 26, 2007

I have created a snapshot

CREATE DATABASE AdventureWorks_Snapshot1200 ON
(NAME = N'AdventureWorks_Data', FILENAME=
N'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDataAW_1200.ss')
AS SNAPSHOT Of AdventureWorks


I changed the records
AddressLine1
from 1970 Napa Ct. to 1970 Napa Ct. Apt 1

When i run
select * from Person.Address
AventureWorks_Snapshot1200 where addressid = '1'

select * from Person.Address
AventureWorks where addressid = '1'
Both appear as 1

When i change Apt to 2 and run it both appear 2
Changed again to 3 both appeared as 3 too.


I was under the impression that the snapshot would remain as 1 when the new update 2 has been performed.

Any light be appreciated.

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Mar 31, 2008



Hi all :-)

I am new to Sql server and hope that someone in here might be able to help me out with a little advice on how to go about how to achive the following.

My boss wants me to set up a copy of one of our production databases, the copy is supposed to be used for running questions against thru businessobjects. There will be aprox 10 simultanious users, the original and the copy must never be further apart in time then 15 min. The database is today about 25 gigs and to make it even more complicated the copy must be available at all time during business hours (8-17). The solution is also supposed not to influence the production databases perfommance to much (really low impact to the performance is a key issue).

The options I have thought of is:
1. Use mirroring and then take a snapshot of the mirror for the users to connect to.
2. Replicate only the data that is needed.
3. Log shipping in a combination with the online restore option in sql 2005 server.
4. Log shipping and then take a snapshot of the copy for the users to connect to.

I have also thought about if the need for current data is that high it might even be better to let them run their questions directly against the production db instead since there will not be so many simultanious users.

Any of you guys that have any ideas, all tips will be very appreciated!

Thanks in advance :-)
/Wandy

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