How To Check DataSource Control For Values
Jan 18, 2008
Hey all,
I was wondering what the best method of checking on page_load if a datasource control is pulling back nothing from a database. I want to display a message explaining that there is no data to be displayed. How would I go about doing that? I have tried searching google and whatnot but didn't find anything really helpful.
Here is the current code for the data source control.
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|EventInsider.mdf;Integrated Security=True;User Instance=True"
ProviderName="System.Data.SqlClient" SelectCommand="SELECT Events_Groups.GroupName, Events_Groups.GroupID FROM Events_GroupMembership INNER JOIN Events_Groups ON Events_GroupMembership.GroupID = Events_Groups.GroupID WHERE (Events_GroupMembership.UserID = @UserID)">
<SelectParameters>
<asp:SessionParameter Name="UserID" SessionField="UserID" />
</SelectParameters>
</asp:SqlDataSource>
But I have no idea what the code behind would be to check it on page_load. If there is no way to particularly do this, do you have to do it per control? Like dropdownbox's or gridviews? I am just confused on how to check to make sure there is data to be displayed.
Thanks,
Chris
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May 21, 2006
When I put a sqldatasource in my page and want to configure it and add a new connection to it I recieve this error : "object reference not set to an instance of an object" . Do you have any idea about solving this problem. please help me Thanks
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Sep 18, 2007
I'm trying to assign a datasource to a gmap control in 2.0 so that i can get pushpins in the map for all the locations in the sql db. I've enclosed my code below as well as a link to the site that provides the control and their sample. Can anyone tell me why it won't show the pins? What am I doing wrong?
Thanks.
My Code (sqllocations is a datasource):
GMap1.DataSource = sqllocations;
GMap1.DataBind();
Their site: http://en.googlemaps.subgurim.net/ejemplos/ejemplo_991000_DataSource.aspx
Their example (part of their explanation is not english, sorry):
List<DataSourceField> fields = new List<DataSourceField>(); fields.Add(new DataSourceField(45, 2, "hola"));fields.Add(new DataSourceField(46, 3));// Lo comentamos porque al utilizar la clase DataSourceField, // pero si fuera un dataset o cualquier otra cosa, // le deberÃamos dar los nombres correspondientes// GMap1.DataLatField = "lat";// GMap1.DataLngField = "lng";// GMap1.DataGInfoWindowTextField = "gInfoWindowText";GMap1.DataSource = fields;GMap1.DataBind();
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Oct 1, 2007
Hello,
I encountered an interesting situation. I have a gridview and a sqldatasource. It has delete function. When I delete a record an error of foreign key violation is raised. I would like to trap this error and give a user friendly message to the user.
If I use ADO.Net I can use Try/Catch, but it seems there is no way to do the same thing using datasource. Anyone knows?
Thank you,
J
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Nov 19, 2007
Hi all,
Can anyone tell me how I can do a "Dirty Read" on a SqlDataSource Control? I'm affraid that the record locks are causing problems on the live system.
It is connected to an infromix db using odbc. Thanks.
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Mar 24, 2008
does anybody know where I can learn how to add, update, delete using SQL datasource control? I have a couple of books that shows me how to SELECT but nothing shows me how to update, add new record or delete with the SQL data source control. Even this website doesn't have any tutorial. Does any body know where I can read up on how to use all features of this control? Or where that have a couple of examples on how to use it?
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Apr 11, 2006
Hi I am trying to open a database connection to a Northwind database. I can open it with a datasource control and return data to a gridview, but can't programically. I get a sqlexception error. this is ust for learning.
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Dim S As New SqlConnection Dim builder As New SqlConnectionStringBuilder builder("Data Source") = ".SQLEXPRESS;AttachDbFilename=C:SQLNORTHWND.MDF" builder("Integrated Security") = True builder("Connect Timeout") = 30 builder("User Instance") = True S.ConnectionString = builder.ConnectionString Me.Label1.Text = S.ConnectionString S.Open() Me.Label2.Text = S.State.ToString S.Close() Me.Label3.Text = Me.SqlDataSource1.ConnectionString.ToString End Sub
The text in label2 and Label three are identical except there are "" around the datasource.
How come I can connect through the datasource control but not through code?
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Mar 23, 2008
I can select the tables and fields, but when I click on Advanced the Check Box to Create the Commands is not available. they are dimmed out.
Why is this happening, is it a setting that I have missed. Any help is appreciated.
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Mar 22, 2006
hi,
it is my first post on this forum, please be patient if i miss any important bit of information.
i am transporting data from a legacy system into mssql 2k5 using SSIS.
among those column of a dataset there are 13 columns, all necessary for operational reasons, that i need to ensure data consistance.
i believe i could do this check using the lookup data flow item, but surely there must be a way to do it in a more streamlined fashion.
since column names contain numbers to distinguish the version, eg; col01, col02, col03 .. col13.
i thought i could include the lookup within a loop and use a couple of variables to do this trick, but since i have not done it before i am asking for some sort of guidance from a guru among you folks.
please let me know if further clarification is necessary.
regards,
nicolas
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Nov 27, 2007
Hi,
I want to be able to spot when the same employee name gets added to my grid. This is to ensure that I cannot not have the same firstname and lastname (i.e. cannot have 2 John Smiths).
It is kind of like spoting for duplicates but they are not PKs. I was hoping if there was a way you could identify the the feild values on the "inserting" event of the datasource so I could put some logic in. The reason for placing it there is because we have the e.cancel = true command.
Thanks in advance,
Jon
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Aug 21, 2007
All:
I am trying to code the following SQL into an OLEDB data source but it is not allowing me to do so because I think the variables are nested in multiple SQL statements. I have seen other posts that suggest using a variable to store the SQL but I am not sure how it will work.
I would also like to mention that the OLEDB source executes from within a For Each loop that is actually passing the values for the variables, which was one of the reasons I got stumped on how I could have a variable store the SQL.
Here is the SQL:
select b.ProgramID, b.ProductCode, b.BuyerID, b.Vendor,sum(a.Ordered) As Qty_Pruchased
From SXE..POLine a INNER JOIN
(SELECT VIR_Program.ProgramID, VIR_ActiveSKU.ProductCode, VIR_ActiveSKU.BuyerID, Vendor
FROM VIR_Program INNER JOIN
VIR_ActiveSKU ON VIR_Program.ProgramID = VIR_ActiveSKU.ProgramID
INNER JOIN Vendor ON VIR_Program.VendorID = Vendor.VendorID
WHERE ProgramFreq=?) b
ON a.ProductCode = b.ProductCode
WHERE a.TransDate >=? AND
a.TransDate ?
Group By b.ProgramID, b.ProductCode, b.BuyerID, b.Vendor
Thanks!
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Mar 7, 2008
I have a query that varies depending on control values. For example, what comes after the SELECT, FROM, WHERE, or ORDER vary with what table they need to look in, how they want to look it up, what value they are looking for, and what order they want it displayed in. There are too many possibilities to write seperate queries for. The data found goes to a dataset and gets bound to a gridview. This is done inside a vb sub.
I tried to make a similar query in a selectcommand inside sqldatasource tags with if-then-elses in <% %>s but got an error saying something like "constructs were not allowed inside tags."
How do you make a varying query as a selectcommand inside datasource tags?
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Jul 26, 2014
I am relatively new to SQL and as a project I have been asked to create the SQL for a simple database to record train details. I want to implement a check constraint which will prevent data from being inserted into a table if the weight of the train is more than the maximum towing weight of the locomotive. FOr instance, I need to add the unladen weight and maximum capacity of each wagon (located in the wagon type table) and compare it against the locomotive maximum pulling weight (the locomotive class table). I have the following SQL but it will not work:
check((select SUM(fwt.unladen_weight+fwt.maximum_payload) from
hauls as h,freight_wagon as fw,freight_wagon_type as fwt,train as t where
h.freight_wagon_serial_number = fw.freight_wagon_serial_number and
fw.freight_wagon_type = fwt.freight_wagon_type and
h.train_number = t.train_number) <
(select lc.maximum_towing_weight from locomotive_class as lc,locomotive as l,train as t where
lc.locomotive_class = l.locomotive_class and l.locomotive_serial_number = t.locomotive_serial_number))
The hauls table is where the constraint has been placed and is the intermediary table between train and freight wagon.
I may not have explained this very well; but in short, i need to compare the sum of two values in one table against a values located in another table...At present I keep getting a message telling me the sub query cannot return more than one row.
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Oct 10, 2006
Im ripping my hair out here.I need to access the field in a datasource control of use in non presentation layer code based actions.I know the I can use a code base connection and query but I dont see why i need to make two trips the the DB when the info is already available.The datasource is attached to a details view control and the details view control is nested in a loginview controlI've tried defining but all I can get in the header name of the field but not the dataitem, the dataitem causes an error help please jim
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Dec 21, 2006
Hi,
I need to assign the value for a field in a report based on Expand/Collapse state of another field.
Eg. If Collapsed, the value should be "AA" else if Expanded "BB".
Is there any way to get the value of InitialToggleState for any field in SSRS.
Thanks in advance.
Sathya
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Jan 19, 2007
How can I check on NULL values in a Select statement?
SELECT ID FROM TabelWHERE somecolumn <> NULL??
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Nov 21, 2006
Hi all,
I have a gridview bound with a SQLDataSource. I am using the Update feature of the SQLDataSource to update a SQL Server database with values entered into the gridview. However I am not getting it to work. I believe this is due to the controls that contain the user entries are not the gridview itself, but rather child controls within the gridview. I have been using the names of the actual controls but nothing happens. Upon submit, the screen returns blank, and the database is not updated. Here is some code:
<asp:GridView ID="GridEditSettlement" runat="server" AutoGenerateColumns="False" BackColor="Navy"
BorderColor="IndianRed" BorderStyle="Solid" Font-Names="Verdana" Font-Size="X-Small" DataSourceID="SqlDataSource_grid" AllowPaging="True" AllowSorting="True" ForeColor="White" DataKeyNames="legid">
<Columns>
<asp:CommandField ShowEditButton="True" CancelImageUrl="~/App_Graphics/quit.gif" CancelText="" EditImageUrl="~/App_Graphics/EditGrid.GIF" EditText="" UpdateImageUrl="~/App_Graphics/save.gif" UpdateText="" ButtonType="Image" />
<asp:BoundField DataField="StartDate" HeaderText="Start Date" ReadOnly="True" />
<asp:BoundField DataField="EndDate" HeaderText="End Date" ReadOnly="True" />
<asp:BoundField DataField="CounterpartDealRef" HeaderText="CP Deal Ref" ReadOnly="True" />
<asp:TemplateField HeaderText="Preliminary Settlement Price" ><ItemTemplate>
<asp:Label ID=lblPreliminary runat=server Text='<%# Bind("PrimarySettlementPrice") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID=txtPrimaryPrice Text='<%# Bind("PrimarySettlementPrice") %>'></asp:TextBox>
</EditItemTemplate></asp:TemplateField>
<asp:TemplateField HeaderText="Agreed Settlement Price"><ItemTemplate>
<asp:Label ID=lblAgreed runat=server Text='<%# Bind("AgreedSettlementPrice") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID=txtAgreedPrice Text='<%# Bind("AgreedSettlementPrice") %>'></asp:TextBox>
</EditItemTemplate></asp:TemplateField>
<asp:BoundField DataField="Volume" HeaderText="Volume" ReadOnly="True" />
<asp:BoundField DataField="Price" HeaderText="Price" ReadOnly="True" />
<asp:BoundField DataField="TotalVolume" HeaderText="Total Volume" ReadOnly="True" />
<asp:BoundField DataField="InstrumentName" HeaderText="Instrument" ReadOnly="True" />
<asp:BoundField DataField="NominalValue" HeaderText="Nominal Value" ReadOnly="True" />
<asp:BoundField DataField="Strike" HeaderText="Strike" ReadOnly="True" />
<asp:BoundField DataField="DeliveryDate" HeaderText="Delivery Date" ReadOnly="True" />
<asp:TemplateField HeaderText="LegId" SortExpression="LegId">
<ItemTemplate>
<asp:Label ID="lblLegID" runat="server" Text='<%# Bind("LegId") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID=txtLegID Text='<%# Bind("LegId") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle BackColor="#FFFF66" ForeColor="#333333" />
<EditRowStyle BackColor="#FFFF66" Font-Names="Verdana" Font-Size="X-Small" ForeColor="#333333" />
<PagerStyle ForeColor="White" />
<AlternatingRowStyle BackColor="White" ForeColor="#333333" />
</asp:GridView>
<br />
<asp:SqlDataSource ID="SqlDataSource_grid" runat="server" ConnectionString="<%$ ConnectionStrings:DealCaptureDev %>" SelectCommand="sp_get_single_deal" SelectCommandType="StoredProcedure" UpdateCommand="Update trDealLeg Set PrimarySettlementPrice=@primarysettlement, AgreedSettlementprice=@agreedsettlement, LastUpdate=GetDate(), LastUpdateBy=Session('userid') Where LegID=@legid" EnableCaching="True" ConflictDetection="CompareAllValues" ProviderName="System.Data.SqlClient">
<SelectParameters>
<asp:QueryStringParameter DefaultValue="" Name="dealnum" QueryStringField="deal"
Type="String" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter ControlID="txtLegId" PropertyName="Text" Name="legId" />
<asp:ControlParameter ControlID="txtPrimarySettlement" Name="primarysettlement" PropertyName="Text" />
<asp:ControlParameter ControlID="txtAgreedSettlement" Name="agreedsettlement" PropertyName="Text"/>
<asp:SessionParameter DefaultValue="" Name="userid" SessionField="userid" />
</UpdateParameters>
</asp:SqlDataSource>
As seen above, controls such as txtPrimarySettlement are referenced but the update is not successful. The text boxes are within the GridEditSettlement gridview. In the .aspx code I cannot use FindControl (at least I don't think it will work).
So the questions are: Is it possible to reference the child controls, if so - how? Is there another way to do this, such as in the vb code behind - in the either the gridview's RowUpdating event or the SQLDataSource's Updating event.
What is the best approach? Anyone come up against this issue before?
Thanks,
KB
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Aug 20, 2006
I am using Visual Web Developer Express 2005 and SQL Server Express 2005.
I have set up a trigger that fires when an update has been performed on a specific table. The trigger checks to see if specific columns have been updated. If they have, then the trigger code is executed. This part works fine.
I am now trying to find a way to check if null values exist in either one of two field from the same table. If either field contains a null value, then I don't want the trigger code to be executed.
How can I check for null values and skip a block of code within my Transact Sql trigger.
Thanks.....
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Jan 30, 2008
How can i return how much of the timespan in table2 is in the timespan in table1?
table 1 - email
-------
Login time: 2007-12-12 13:14:26.363
Logout time: 2007-12-12 14:15:58.803
table2 - phone
------
Login time: 2007-12-12 12:11:08.343
Logout time: 2007-12-12 14:13:10.847
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Jan 4, 2005
say i have a table, and in it are two columns, column1 and column2 and i do the following query:
SELECT column1, column2 FROM table WHERE column2 = '12345'
i want to check if column1 has all the same values, so in the first case, no
column1 column2
------- --------
4 12345
9 12345
5 12345
column1 column2
------- --------
9 12345
9 12345
9 12345
in the 2nd case, column1 contains all the same values, so yes
is there anyway i can check this? i would be doing this in a trigger.. say when a new row is inserted, the value of column1 is inserted, but col 2 is null.. so when they try to fill in the value for col2 of that row, the trigger checks to see if the value they put for col 2 is already in the table.. if it isn't, then everything is ok. but if it is already in teh table, then it checks col1 to see if all the values of col1 are the same
i hope this makes sense
thanks
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Jun 4, 2014
I'm pretty new to sql server and now I need to create a script that:
Compares the values of the row with the same id as the row with the update table(which has updated values in it) in which the price, description or replacement part have been changed.
If they did change they should be updated and if they haven't been changed nothing should happen...
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Apr 25, 2008
Hi All,
I have a table Saleshistory with 89481412 records. I have a field Sales of nvarchar type, all the records in this field are numeric, and the records are with 2 decimal places. I expect all the records to be ending at .00 (for example 5.00,345.00,25.00), but I want to verify if something is for example 5.6 etc.
So in short I want to check if any Salesrecords have more than zero values in the decimal. How can I check this.
Please help.
Thanks,
Zee
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May 22, 2008
Hi all,
I wanted to check the previous and next record values.
For example:
sKey NextKey PreviousKey
1 2 Null
2 8 1
8 5 2
5 null 8
I wanted to check the value of NextKey of Prev record and Skey of Next record.
Any idea?
Regards
Helen
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May 22, 2008
Hi all,
I wanted to check the previous and next record values.
For example:
sKey NextKey PreviousKey
1 2 Null
2 8 1
8 5 2
5 null 8
Ex : In the first record of the table, the NextKey is pointing to 2.
So the next record of Skey will be 2. The Next Key for this record is 8. Like wise the next record of this should have the Skey as 8.
Now I need to check whether the NextKey and SKey are correct for all rows.
For that I need to check the previous record of "Next key" and next record of "Skey".
Any idea?
Regards
Helen
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Oct 22, 2007
HI
I have a problem related Store Procedure, that i am trying to extact a value from Database (Like FirstName,LastName,Email Address) through Store Procedure and Display it in the DropDownList(Like: FirstName LastName ,(xyz@xyz.com)) , and this is working correctly.
Now i try to check the value at the same time if it is NULL value in the Database then pass EmptyString to the DropDownList Like ("" "" ,(xyz@xyz.com))
how i can do that in the store procedure.
Comments will be appreciated.
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Dec 18, 2007
Is it possible to write a sql statement to skip aplpha numeric values? I got a field containing these values; 20, 70, 150, 140, 100, KORT, 90, 180, 160. And I'm trying to check if any value is bigger than 175 (@Limit), but I want to skip the value 'KORT'. So is it possible to check if a value is numeric or not? ISNULL( CONVERT(int, ProductVariant.Size), 0) > @Limit Regards, Sigurd
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Feb 11, 2003
Hi all,
I have a field defined as varchar(8) but this field should not contain any letters, needs to be only numbers. How can I validate the data if it contains only numbers? Any ideas?
Thanks,
Jannat.
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Nov 9, 2014
I have created dynamic sql to declare variables based on columns from the table and i set values to those variable now here is the issue . i want to check the variable values how do i do that dynamically
drop table test
create table test
(
id varchar(10) not null,
col1 varchar(10) ,
col2 varchar(10)
[Code] .....
Now my next step is verify if the variable is blank or not how do i do that ?
How do i verify all of the columns one after the other .
I am after the statement like this dynamically
-- IF NOT (@col1 = '') THEN set @SQL = @SQL + '[col1] = ' + @col1 + ' '
--IF NOT (@col2 = '') THEN set @SQL = @SQL + '[col2] = ' + @col2 + ' '
I need to check if the columns are blank or not dynamically as i do not want to hard code the column names there.
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Mar 13, 2014
I am using the below query to calculate column values. But I need to return zero when a column values is empty or null.
select [Funding] [Fundings],
[Original] AS [Originals],
[Variance] = SUM([Previous_Year]-[Current_Year]),
[SumValue] = SUM([CurrentYear]/4),
[ActualValue] = SUM([Variance] * 0.75),
[FinanceYear],
[New Value] = SUM([Previous_Year]+[Current_Year])
from Finance
GROUP BY [Original], [FinanceYear]
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Mar 28, 2014
select '$ '+ CONVERT(varchar,CONVERT(decimal(10,0),CONVERT(money, Amt_Value)),1) as [Amount]
from Products
How can I sum this column values and need to set a validation like the column has null values it has to return zero.
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Feb 10, 2004
I have never used triggers before and I have tried to solve one problem. If I have the column "currency" in a table and want to make sure that the entered value i valid in relation to another table that contains valid currency formats, I did it like this:
---------------------------------
CREATE TRIGGER [trigger_checkCurrency] ON [dbo].[Client]
FOR INSERT, UPDATE
AS
declare @currency as char(50)
declare @country as char(50)
declare cur cursor for SELECT currency, country
FROMinserted
OPEN cur
fetch cur into @currency, @country
WHILE @@FETCH_STATUS = 0
BEGIN
if not exists(select * from listinfoid where listname = 'currency' and listid = @currency)
begin
set @currency = (cast(@currency as varchar (3)) + ' is not a valid currency')
CLOSE cur
DEALLOCATE cur
RAISERROR (@currency,16,-1) with log
return
end
if not exists(select * from listinfoid where listname = 'country' and listid = @country)
begin
set @country = (cast(@country as varchar (3)) + ' is not a valid contry')
CLOSE cur
DEALLOCATE cur
RAISERROR (@country,16,-1) with log
return
end
else
fetch cur into @currency, @country
END
CLOSE cur
DEALLOCATE cur
update Client set currency = UPPER(currency), country = UPPER(country)
---------------------------------
I use a cursor to handle multiple rows in an update query.
(SQL2000-server)
Is there an easier och better way to do this?
I´m a bit unsure of this code.
Thanx!
/Erik
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Dec 6, 2013
I know how to check for a sinle vlaue but how do I chekc to see if multiple values exist. I need to check for certain email addresses from a list that I have.
Let us say I ahve 3 email addresses, I want to check for all of them in a table and for eevery email address that is present I want to print something like "You email address is XXX" and if one of those 3 is not found my results should look like
"You email address is XXX"
YYYYY not found
"You email address is ZZZZ"
I'm attaching some TSQL that I tried on [AdventureWorks2012].[Person].[EmailAddress]
/****** Select ALL if where an email address is present in the list ******/
SELECT EmailAddressID,EmailAddress
FROM [AdventureWorks2012].[Person].[EmailAddress]
WHERE EmailAddress IN
(
'ken0@adventure-works.com', --1
'terri0@adventure-works.com', --2
[Code] ....
-- Test to see if a single email address is present
IF EXISTS
(
SELECT EmailAddress FROM [AdventureWorks2012].[Person].[EmailAddress]
WHERE EmailAddress IN ('25rob0@adventure-works.com')
)
BEGIN
SELECT 'Email address is presnt'
[Code] ....
When I check multiples using EXISTS it works as per its design and says YES even if a single item is present.
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Aug 12, 2014
I have the following objective:
1. I want to check a column to see if there are values (to Eliminate dups)
2. Once checked the values in a column, if not found insert the new value
Here is my code for this:
ALTER TRIGGER DUPLICATES ON AMGR_User_Fields_Tbl
-- When inserting or updating
AFTER INSERT, UPDATE AS
-- Declare the variables
DECLARE @AN varchar(200)
[Code] ....
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