How To Retrieve Value From DataReader Which Come From Function ?

May 5, 2008

Hi...

I made some code which is to return DataReader.

And then I want to use it in other procedure. But I don't know how to extract value from Reader.

Public Function GetMyProfile(ByVal uid As string) As SqlDataReader

Using conn As New SqlConnection(ConnString)

.

.

Dim Reader As SqlDataReader = cmd.ExecuteReader()
Return Reader.RecordsAffected
cmd.Dispose()
End Using
End Function

Sub Button_Click()

dim dr as  SqlDataReader

dr=GetMyProfile(ByVal uid As string)

....Is it right way ? 

End Sub

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Jun 9, 2006

I have  a sql query where i want to find the highest number in a column.  I believe i am querying for the data properly, but i think my problem is that i don't know how to retrieve that information in code.  The error message i get is this:"Conversion from type 'DBNull' to type 'Integer' is not valid"Here is my code:------------------------------------------------------------- queryString = "SELECT MAX(SortOrder) as HighestNumber " & _                            "FROM uQI_Questions WHERE (SurveyID = @SurveyID)"........ more code in between ....... ' Make sure there is 1 and only 1 record returned.            If ds.Tables(0).Rows.Count = 1 Then                ' retrieve the number and add 1 to it.                NextNumber = ds.Tables(0).Rows(0)("HighestNumber")                NextNumber += 1            Else                ' Else it must be the FIRST record so return '1'.                NextNumber = 1            End If-------------------------------------------------------------The line that generates the error is "NextNumber = ds.Tables(0).Rows(0)("HighestNumber")".Any suggestions?

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Table Function To Retrieve File Properties

Mar 25, 2008

Here's a table function that returns a table variable containing various file properties (creation date, size, etc.). The one limitation to remember is that it won't work with files on mapped drives; you have to use the full \<Server><Share><Folder1..Folder n><Filename> syntax. Still, it's a pretty useful thing to have around. :)

/****************************************************************************/
CREATE FUNCTION fnc_GetFileProps

(@FileName VARCHAR (1024))

RETURNS @Results TABLE (
ErrorCode TINYINT DEFAULT (0),
PropName VARCHAR (255),
PropValue SQL_VARIANT
)

AS
BEGIN
DECLARE @OLEResult INT
DECLARE @FS INT
DECLARE @FileID INT
DECLARE @Message VARCHAR (8000)
DECLARE @ErrorSource VARCHAR (255)
DECLARE @ErrorDesc VARCHAR (255)
DECLARE @INT INT
DECLARE @VARCHAR VARCHAR (1024)
DECLARE @DATETIME DATETIME
DECLARE @BIGINT BIGINT

-- Create an instance of the file system object
EXECUTE @OLEResult = sp_OACreate 'Scripting.FileSystemObject', @FS OUT
IF @OLEResult <> 0
BEGIN
EXEC sp_OAGetErrorInfo @FS, @ErrorSource OUT, @ErrorDesc OUT

INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, @ErrorSource, @ErrorDesc)

RETURN
END

EXEC @OLEResult = sp_OAMethod @FS, 'GetFile', @FileID OUT, @Filename
IF @OLEResult <> 0
BEGIN
EXEC sp_OAGetErrorInfo @FS, @ErrorSource OUT, @ErrorDesc OUT

INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, @ErrorSource, @ErrorDesc)

RETURN
END

EXEC @OLEResult = sp_OAGetProperty @FileID, 'Attributes', @INT OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'Attributes', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('Attributes', @INT)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'DateCreated', @DATETIME OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'DateCreated', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('DateCreated', @DATETIME)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'DateLastAccessed', @DATETIME OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'DateLastAccessed', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('DateLastAccessed', @DATETIME)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'DateLastModified', @DATETIME OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'DateLastModified', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('DateLastModified', @DATETIME)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'Name', @VARCHAR OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'Name', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('Name', @VARCHAR)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'Path', @VARCHAR OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'Path', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('Path', @VARCHAR)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'ShortPath', @VARCHAR OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'ShortPath', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('ShortPath', @VARCHAR)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'Size', @BIGINT OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'Size', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('Size', @BIGINT)

EXEC @OLEResult = sp_OAGetProperty @FileID, 'Type', @VARCHAR OUT
IF @OLEResult <> 0
BEGIN
INSERT @Results (ErrorCode, PropName, PropValue)
VALUES (1, 'Type', '<ERROR RETRIEVING PROPERTY>')
END
ELSE
INSERT @Results (PropName, PropValue)
VALUES ('Type', @VARCHAR)

EXECUTE @OLEResult = sp_OADestroy @FileID
EXECUTE @OLEResult = sp_OADestroy @FS

RETURN
END
/****************************************************************************/


I geek, therefore I am

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Aug 22, 2007

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"2 8 7"
"2 8"
"2"
"22"
"3 2 8"

I have tried the following

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May 10, 2007

I have used the following Windows C codes to retrieve records from the bus_newjob table in SQL server:



==========================================================

// construct command buffer to be sent to the SQL server
dbcmd( dbproc, ( char * )"select job_number, job_type," );
dbcmd( dbproc, ( char * )" disp_type, disp_status," );
dbcmd( dbproc, ( char * )" start_time, end_time," );
dbcmd( dbproc, ( char * )" pickup_point, destination," );
dbcmd( dbproc, ( char * )" veh_plate, remark," );
dbcmd( dbproc, ( char * )" customer, cust_contact_person," );
dbcmd( dbproc, ( char * )" cust_contact_number, cust_details" );
dbcmd( dbproc, ( char * )" from bus_newjob" );
dbcmd( dbproc, ( char * )" where disp_status = 0" );
dbcmd( dbproc, ( char * )" order by job_number asc" );

result_code = dbsqlexec( dbproc ); // send command buffer to SQL server

// now check the results from the SQL server
while( ( result_code = dbresults( dbproc ) ) != NO_MORE_RESULTS )
{
if( result_code == SUCCEED )
{
memset( ( char * )&disp_job, 0, sizeof( DISPATCH_NEWJOB ) );
dbbind( dbproc, 1, INTBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.job_number );
dbbind( dbproc, 2, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.job_type );
dbbind( dbproc, 3, INTBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.disp_type );
dbbind( dbproc, 4, INTBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.disp_status );
dbbind( dbproc, 5, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.start_time );
dbbind( dbproc, 6, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.end_time );
dbbind( dbproc, 7, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.pickup_point );
dbbind( dbproc, 8, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.destination );
dbbind( dbproc, 9, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.veh_plate );
dbbind( dbproc, 10, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.remark );
dbbind( dbproc, 11, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.customer );
dbbind( dbproc, 12, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.cust_contact_person );
dbbind( dbproc, 13, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.cust_contact_number );
dbbind( dbproc, 14, NTBSTRINGBIND, ( DBINT )0, ( LPBYTE )&disp_job.new_job.cust_details );

// now process the rows
while( dbnextrow( dbproc ) != NO_MORE_ROWS )
{
new_job = malloc( sizeof( DISPATCH_NEWJOB ) );
if( !new_job )
return( 0 );
memcpy( ( char * )new_job, ( char * )&disp_job, sizeof( DISPATCH_NEWJOB ) );
append_to_list( &Read_Job_List, new_job );
}
}
else
{
sprintf( str, "Results Failed, result_code = %d", result_code );
log_str( str );
break;
}
==========================================================



where the job_type columIn is of the char(1) type, NTBSTRINGBIND is the vartype argument in the dbbind() function.



However, what I have gotten is nothing more than a null string from the job_type column. I have alternatively changed the vartype argument to STRINGBIND, CHARBIND and even INTBIND, but the results are the same.



Who can tell me the tricks to retrieve a char(1) column from SQL server?



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        int x =
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        while
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            for
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            {

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I have received this same error before, but I'm not sure why I'm getting it here.'Create a Connection object.
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If tx_lastname.Text <> "" Then
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End If

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.CommandType = CommandType.Text

'Open the connection to betaserv.
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'Run the SQL statement.
.ExecuteNonQuery()

End With

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'loop through recordset and populate temp table
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'Set the command type that you will run.
MyInsert.CommandType = CommandType.Text

'Run the SQL statement.
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'Set the command type as StoredProcedure.
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'Create a new DataSet to hold the records and fill it with the rows returned from stored procedure.
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GridView1.DataSource = DS
GridView1.DataBind()
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'Dispose of the DataAdapter
MyDataAdapter.Dispose()

'Close server connection
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Hi

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regards

Jim

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Why won't this dataReader read?

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Dim objReader As SqlDataReader
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I have found examples of coding the DataReader, defining all the
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<asp:QueryStringParameter Name="CategoryID" QueryStringField="cat"
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    </asp:SqlDataSource>

If I take out the RETURN_VALUE Parameter, my results display in my data
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determine the remaining number of pages etc. Is my RETURN_VALUE
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CREATE PROCEDURE sp_PagedItems
   (
    @Page int,
    @RecsPerPage int,
    @CategoryID int
   )
AS

-- We don't want to return the # of rows inserted
-- into our temporary table, so turn NOCOUNT ON
SET NOCOUNT ON


--Create a temporary table
CREATE TABLE #TempItems
(
   ID int IDENTITY,
   No varchar(100),
   Name varchar(100),
   SDescription varchar(500),
   Size varchar(10),
   ImageURL varchar(100)
)


-- Insert the rows from tblItems into the temp. table
INSERT INTO #TempItems (No, Name, SDescription, Size, ImageURL)
SELECT No, Name, SDescription, Size, ImageURL FROM Products WHERE CategoryID=@CategoryID

-- Find out the first and last record we want
DECLARE @FirstRec int, @LastRec int
SELECT @FirstRec = (@Page - 1) * @RecsPerPage
SELECT @LastRec = (@Page * @RecsPerPage + 1)

-- Now, return the set of paged records, plus, an indiciation of we
-- have more records or not!
SELECT *,
       MoreRecords =
   (
    SELECT COUNT(*)
    FROM #TempItems TI
    WHERE TI.ID >= @LastRec
   )
FROM #TempItems
WHERE ID > @FirstRec AND ID < @LastRec


-- Turn NOCOUNT back OFF
SET NOCOUNT OFF

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Apr 22, 2006

I am very disappinted where Datareader have no RecordCount where I can get the total records it read. I guess I found a way:
 
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Have SQL Server 2005 count for me....
 

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Jun 15, 2007

As a beginner, I'm attempting to set up security for SQL Server But it's not working and am fairly confused at the moment.

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The system is a standalone PC using XP Pro with SQL Express installed.

The connection string is valid (and works, allowing access to all data) and is of the type:
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The application is written is VB.NET

I hope I'm making some simple mistake here and I'd really appreciate any thoughts ...

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Apr 22, 2008



Hi All,
I am the following problem retrieving Float data from a Compact SQL database, it worked perfectly with 1.1 .Net CF, but since updating to 2.0 .Net CF its crashing with a "InvalidCastException" Error, have checked the DB its a Float...

// Start of code snip


cmd = conn.CreateCommand();

string cmdString ="select " +

RECORDNUMBER_COLUMN + ", "

+ FULLNAME_COLUMN + ", "

+ FPFILENAME_COLUMN + ", "

+ IMAGENAME_COLUMN + ", "

+ BMPNAME_COLUMN + ", "

+ TEMPLATENAME_COLUMN + ", "

+ SCORE_SCORE_COLUMN + " "

+ "from " + ENROLTABLE_NAME + " where " + RECORDNUMBER_COLUMN + " = " + iNumber;

cmd.CommandText = cmdString;

SqlCeDataReader DataReader = cmd.ExecuteReader(System.Data.CommandBehavior.SingleResult);

while(DataReader.Read())

{


recordnumber = DataReader.GetInt32(DS_WORD_COLUMNINDEX_RECORDNUMBER);

fullname = DataReader.GetString(DS_WORD_COLUMNINDEX_FULLNAME);

fpdataname = DataReader.GetString(DS_WORD_COLUMNINDEX_FPFILENAME);

fpimagename = DataReader.GetString(DS_WORD_COLUMNINDEX_IMAGENAME);

personbmpname = DataReader.GetString(DS_WORD_COLUMNINDEX_BMPNAME);

persontemplatename = DataReader.GetString(DS_WORD_COLUMNINDEX_TEMPLATENAME);
//*******************************************************


Score_Score = DataReader.GetFloat(DS_WORD_SCORE_COLUMNINDEX_TEMPLATESCORE);
// This generates the error : "InvalidCastException"
//*******************************************************


ReturnValue=true;

}

DataReader.Close();

conn.Dispose();

cmd.Dispose();



// End Of Snip


Cheers for any help with this

Adz

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How to do that?

I can populate the 'some hard coded date data' to a SSIS variable but do not know how to embed that in the SQL statement.

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Smith

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Hello,

I am using a DataReader to read an ODBC Data Source.



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In SQL 2000 DTS I was able to use a script to skip the bad dates.



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Michael

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Feb 21, 2008

hi,
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second problem is how to comma separate the results.with array? or what please help
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Dim strSQL As StringDim dr As SqlDataReader
Dim userID As Integer = Session("cmmLogonUserID")
strSQL = "select id,extension from musicExt"Dim cmd As New SqlCommand()cmd = New SqlCommand(strSQL, Conn)
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Apr 16, 2008

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'check if there are existing charges for this person. The user must enter in atleast 1 charge before proceeding with arrest insert.
MyCheck = New SqlCommand("SELECT * FROM ARREST_CHARGES WHERE ARRESTNO = '" & Session("uid") & "'", MyConnection)
MyCheck.CommandType = CommandType.Text
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If MyDataReader.HasRows Then

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MyConnection1.Open()

MyInsert = New SqlCommand("INSERT INTO ARREST_INDEX (ARRESTNO, NOTES) VALUES ('" & Session("uid") & "','" & tx_notes.Text & "')", MyConnection1)

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MyConnection1.Close()

MyConnection2 = New SqlConnection("....")
MyConnection2.Open()

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MyOtherInsert.CommandType = CommandType.Text
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Label1.Text = ""
Else
div1.Style.Add("display", "block")
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End If
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Line 62: MyInsert.ExecuteNonQuery()
Line 63:
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