SqlDataAdapter Binding Empty Data

Mar 31, 2004

I have a block of code that does a Fill() with a DataAdapter, which seems to throw an exception if no values are returned. Then, when I try to bind the DataSet that gets filled, an error occurs, it doesn't even try to bind the column headers or anything.





This process seems to work fine when some rows are found, but it is not always guaranteed that the row count will always be > 0. The nice thing about using the Fill() function, is that it creates all my column headers automatically, so I was just wondering if there's a way to do a Fill() then a subsequent DataBind() to a DataGrid which would automatically format the columns even when no rows are found?





Here's a bit of the source.. if the last line finds no rows, it throws an exception ( I assume this is normal):





strSQL = "SELECT * FROM Prods";


cm.CommandText = strSQL;


da = new SqlDataAdapter( cm );


da.Fill(shelf);





Anyone got any ideas on how to fix this problem?








Brent

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I've a management module (managing Products) currently being displayed on the aspx page using ObjectDataSource and GridView control.The datasource is taken from a class residing in my Data Access layer with custom methods such as getProducts() and deleteProduct(int productID)I'm currently using SqlDataAdapter as well as Datasets to manipulate the data and have no big problems so far.However, my issue is this, each time i delete a product using the deleteProduct method, I would need to refill the dataset to fill the dataset before i can proceed to delete the product. But since I already filled the dataset using the getProducts() method, is it possible to just use that dataset again so that I dont have to make it refill again? I need to know this cos my data might be alot in the future and refilling the dataset might slow down the performance. 1 public int deleteCompany(Object companyId)
2 {
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4
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8
9 deleteCommand.Parameters.Add(p1);
10 dataAdapter.DeleteCommand = deleteCommand;
11
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13
14 try
15 {
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17 {
18 row.Delete();
19 }
20 return dataAdapter.Update(companyDS.Tables["pg_Company"]);
21 }
22 catch
23 {
24 return 0;
25 }
26 finally { }
27 }
I thank you in advance for any help here.

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I thought I'd post this quick problem and answer, as I couldn't find the answer when searching for it. 
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using System.Collections;
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SqlDataAdapter && SqlParameter

Mar 26, 2007

Hi I am writing an app in flash which needs to hook up to MS SQL via asp.I need the code below to pass the var (ptodaysDate) to the sql statement. I can hard code it in and it works great but I really need to pass the var from flash.Pulling my hair out here, not much left to go.Any help greatly appreciated.----------------------------------------------    [WebMethod]    public Schedule[] getSchedule(int ptodaysDate)    {                SqlDataAdapter adpt =            new SqlDataAdapter("SELECT scheduleID, roomName, eventType,unitName,groupName,staffName,staffName2,theDate,theEnd FROM tb_schedule Where theDate >= @rtodaysDate", connString);        SqlParameter rtodaysDate = new SqlParameter("@rtodaysDate", ptodaysDate);               DataSet ds = new DataSet();        ArrayList al = new ArrayList();        adpt.Fill(ds);        foreach (DataRow row in ds.Tables[0].Rows)        {            Schedule obj = new Schedule();            obj.scheduleID = (int)row["scheduleID"];            obj.roomName = (string)row["roomName"];            obj.eventType = (string)row["eventType"];            obj.unitName = (string)row["unitName"];             obj.groupName = (string)row["groupName"];             obj.staffName = (string)row["staffName"];            obj.staffName2 = (string)row["staffName2"];            obj.theDate = (string)row["theDate"];            obj.theEnd = (string)row["theEnd"];            al.Add(obj);        }        Schedule[] outArray = (Schedule[])al.ToArray(typeof(Schedule));        return outArray;    }    public class Schedule    {        public int scheduleID;        public string roomName;        public string eventType;        public string unitName;        public string groupName;        public string staffName;        public string staffName2;        public string theDate;        public string theEnd;           }

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How Do I Reuse A SqlDataAdapter

Apr 25, 2007

It's a pretty basic question but I haven't been able to find any examples out there.  I dimmed a dataadapter and would like to reuse later in my code (line 3 in the code below).  What is the correct syntax to do this? Dim da As New SqlDataAdapter("SELECT * FROM myTable", conn)da.Fill(myDataTable)da.______  ("SELECT * FROM myTable2", conn)da.Fill(myDataTable2) 

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Problems With SqlDataAdapter

Aug 15, 2007

I'm working on a project to dynamically create PDFs with content from an SQL server. My current approach is to get the data I need into a DataSet using SqlDataAdapter, write the DataSet to a stream as XML, transform the XML into FO and then output a pdf using FOP. For some reason I get the following exception "System.NullReferenceException - Object reference not set to an instance of an object" when I try to set the SelectCommand property of my data adapter. Code for the project follows:Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load        Dim con As SqlConnection        Dim cmd As SqlCommand        Dim IDlist As String        Dim keyidary As Array        Dim query As String        Dim tempxml As Stream        query = "*****query is valid and very long, so it's not included here*****"        IDlist = Request.Form("chosenIDs")        keyidary = Split(IDlist, ",")        Dim makequery As New StringBuilder(query)        For Each ID As String In keyidary            makequery.Append(" OR (KeyID = '" & ID & "')")        Next        query = makequery.ToString()        'Response.Write(query)         When uncommented this prints the query just fine        'Response.End()        Try            con = New SqlConnection            con.ConnectionString = "****Connection String is valid****"            cmd = New SqlCommand            cmd.CommandText = query            cmd.CommandType = CommandType.Text            cmd.Connection = con            Dim adpt As SqlDataAdapter            adpt.SelectCommand = cmd            'Response.Write(query)          When these are above or between the previous 2 statements, query is printed,            'Response.End()                     otherwise I get the error described above.            Dim profiles As New DataSet            adpt.Fill(profiles)            profiles.WriteXml(tempxml)            Dim step1 As XslTransform = New XslTransform            Dim step2 As XslTransform = New XslTransform            step1.Load(Server.MapPath("TransAttmpt1.xslt"))            step2.Load(Server.MapPath("formatXML.xsl"))            Dim xml, pdf As String            xml = "profiles.xml"            pdf = "Profiles.pdf"            Dim temp2xml As New XPathDocument(tempxml)            Response.Write(query)            Response.End()            Dim midstream As Stream            Dim finalxml As StreamWriter = New StreamWriter(xml)            step1.Transform(temp2xml, Nothing, midstream, Nothing)            Dim xpathdoc2 As XPathDocument = New XPathDocument(midstream)            step2.Transform(xpathdoc2, Nothing, finalxml, Nothing)            GeneratePDF(xml, pdf)        'There's a lot more but it doesn't seem relevant now.... I'm somewhat at a loss on how to proceed and any help is very greatly appreciated.Thanks! 

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SqlDataAdapter Update

Oct 1, 2007

Hi all,
I have datatable having around 50 rows and 3 columns ID, Name and ExpVal, which is an expression columns,where the values can be any SQL functions Like REPLICATE(), SOUNDEX ( 'value' ) Or REVERSE ( 'value' ).....
i want to insert each row in that datatable like
INSERT INTO TAB1 ( ID, Name, ExpVal) VALUES (1, 'some name', SOUNDEX ( 'some name' ) )
so that the ExpVal will have value of the function ie inserted row look like
ID  Name            ExpVal1   some name    S500 <--- Result of SOUNDEX ( 'some name' )
I'm using sqldatadapter to insert these values to the database
string sql = "INSERT INTO TAB1 (ID, Name, ExpVal)VALUES (@ID, @Name, @ExpVal) ";SqlDataAdapter sqlAdptr = new SqlDataAdapter();SqlCommand sqlCmd = new SqlCommand(sql, con);sqlCmd.parameters.Add("@ID", SqlDbType.Int, 0, "ID");sqlCmd.parameters.Add("@Name", SqlDbType.NVarChar, 200, "Name");sqlCmd.parameters.Add("@ExpVal", SqlDbType.VarChar, 100, "ExpVal");sqlAdptr.InsertCommand = sqlCmd;sqlAdptr.Update(dataTable);
This works fine, but the problem is, now the TAB1 contains
ID  Name            ExpVal1   some name   'SOUNDEX ( 'some name' )' instead of S500
Thatis the sql funtion is passed by SqlDataAdapter to database as a string and it is not executing while row is inserted to the table.Please provide what changes i have to make if i want SOUNDEX ( 'some name' ) to executed while data insertion take place
Thanks in advance

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