IDE :: SqlCommand.ExecuteReader Does Not Return Result When Used With A StoredProcedure That Uses While Condition?
Dec 17, 2010
I have a stored procedure that repeats a block of T-SQL statements using WHILE logic until it finds a matching record in a table. When I execute the procedure directly from the SQL Management Studio, it works and returns a record, even when the statements within the WHILE logic have to be repeated over and over again before a matching record is found.
However, when I use the same stored procedure as the commandtext property of an sqlcommand object in Visual Studion 2008 (VB) and call the executereader method of the sqlcommand, the resulting SqlDataReader will only return a row if the T-SQL statements within the WHILE logic find a matching record after a single pass. If it takes more than one pass to find a matching record the SqlDataReader does not return a row. It's like it abandons the execution of the stored procedure after the first pass of the statements within the While logic, disregarding the repetition.
I am using ExecuteReader commands to read records in large external databases. Part of my program logic requires that a condition of the database be examined without reading another record - for instance, I want to know if the database has reached the end without reading an additional record.
i tried this sqlcommand select max(food) from foods and i tried this dim x as double=cdbl(cmd.executescalar)and it throws the the exception {System.Invalid CastException}because the food table is empty and the max(food) is null how can i fix that because i want to take the value and add one to it so do i need to catch the error or try another conversion option?
I'm calling Sqlcommand.ExecScalar() - stepping through the stored proc works fine, right under
RETURN @RecordNum
@RecordNum correctly contains a bigint, as scoped. When I step into the RETURN.. I get an exception thrown, that visual studio does not seem to be able to capture.
The stored procedure works fine when executed directly, and returns a value without problem, and it seems like all is well, stepping through it from my code.
But as soon as I step into 'RETURN @RecordNum' (and recordnum contains a valid number..) BOOM! EXCEPTION! (and no details in the exception either back in visual studio.
I'm blaming a glitch in the matrix.
I've turned off even assigned the return from the ExecScalar to anything, same result.. I've tried ExecReader(), same result. I have turned NO COUNT on and off, same result. If I wasn't already bald, I would be now!
I have a requirement where I have to add items into a List(Of T) (let's call it Target) from an IEnumerable(Of T) (let's call it Source) using Target.AddRange() in VB.NET.
The ? part is a tricky condition that is something like: As long as the as yet unenumerated count is not equal to what is needed to fill the list to the minimum required then randomly decide if the current item should be taken, otherwise take the item.Somethig like...
Source.Count() - Index = _minimum_required - _curr_count_of_items_taken _ OrElse GetRandomNumberBetween1And100() <= _probability_this_item_is_taken ' _minimum_required and _probability_this_item_is_taken are constants
The confounding part is that _curr_count_of_items_taken needs to be incremented each time the TakeWhile statement is satisfied. How would I go about doing that? I'm also open to a solution that uses any other LINQ methods (Aggregate, Where, etc.) instead of TakeWhile.If all else fails then I will go back to using a good old for-loop =)
Service1.svc Public Class Service1 Implements IService1
[code]....
For some unkown reason, I can run the VS 2010 client test and it the WCF host works fine. The code above just returns nothing (it's supposed to return a string)
I have a VB.Net program that will basically make a query to a remote MS-SQL DB using TSQL, return two columns (normally 4 rows/records), 1 is a datetime and 1 is a double. I will then need to return the average of the doubles (which is easy in VB.NET).
As I will need to run this query perhaps 1000 times an hour (programmatically with different input parameters for the query), I am looking for the most efficient way to code this up so that it will take the shortest time to run. I tried SQLDataAdapter and then using dataAdapter.Fill and sometimes it returns an empty set although the raw select query has values returned.
I would like to be able to return the text generated from an httphandler and insert it into my web page during an onload event. There are examples that show how to return an image by setting the image source to the path of the handler. But how do you do this for just text as in the "hello world" basic template. I would like the text value of a label on my page to be set to "hello world", preferably withour using javascript.
I am creating an application for a friend and have no issue inserting or updating the table, but I am having trouble relaying the information from the query back to the corresponding textbox when searching for an entry.
This is the closest thing I've got to a working model, but I'm still getting and "array out of index error".
Anyone else have an issue using read, It appears when I use read it gives me the correct buys but returns the wrong integer value So I use it and it fills the Array i make with &h10, &h6 but read reutnrs number of bytes returned to 1. if there a better way to go with Vb.net with RS232 I mean really my projet dosent have anything out of the Normal
Friend WithEvents CashValidator As System.IO.Ports.SerialPort = New System.IO.Ports.SerialPort("COM1", 9600, IO.Ports.Parity.Even, 8, IO.Ports.StopBits.One) CashValidator.Read(MyResponce, MyResponceLen, 4)
i have form1 with combobox1 and rtb1 i would like to search the rtb1 for combobox1 selected value and return the first 9 characters from the line with the result.
COMBOBOX1 ADRIATIC AMERICA APAC-ANZ
[code]....
so if combobox1 selected.value = "BALTIC" then i would like "1209-4756" to become a named string (eg, cda = 1209-4756)
Im have one heard time trying to get data back from a SP on my SQL server.Here is what I have from looking all over the net to get it working.
Dim conn = New SqlConnection("Data Source=SQLsvr5;Initial Catalog=Orders;Persist Security Info=True;User ID=userx;Password=123123") conn.Open() Dim sqlcomm As New SqlCommand sqlcomm.Connection = conn
I have followed this tutorial for the most part to explain what I am doing. [URL]. What I need to do is figure out the best way to approach to be able to update my formview. I do not understand what the tutorial is trying to explain to me so i tried it the way I have updated a gridview before. But I am receiving "No parameterless constructor defined for this object." I tried to debug and view the callstack but it does not really tell me much.
I have my sql stored procedure to update which when executed works fine. I also have another class in which I reference the application details class. applicant.vb
This is the code in order for when you click the view details link on the gridview it passes you off to another page that shows that applicants details it is within the same applicant.vb class. I am trying to update using the following method on the .aspx page but I receive the following error "No parameterless constructor defined for this object." Memberdetails.aspx
I have a storedProcedure in SQL-Server that I am using to delete duplicates from one of the tables. This storedprocedure makes use of a cursor.I tried to create the same storedprocedure in microsoft access by just replacing the 'CREATE PROCEDURE' with 'CREATE PROC' but it didn't seem to work.
Here is the SQL- storedprocedure:- ALTER PROCEDURE [dbo].[csp_loginfo_duplicates] AS BEGIN
I tried to search forum topics to find a tutorial that will guide me on how to achieve this however seem like most of the tutorials i were finding were confusing me more.With that being said here is what i have,Here is what I am trying to do [URL]that tutorial is exactly what I am trying to achieve however I do not understand what the supplierstableadpater, northwindtableadapters are. I can only assume that I am not doing exactly the same thing as that tutorial.
What I have is a simple sql storedprocedure that selects all employeedetails.And also another sql stored procedure that selects just a few columns from the employees table. On my frist page I am going to list all the employee names in a gridview and when they click the employee name it should take them to another page and show that employee's details. Seems like you have to use an object datasource to achieve this but is there an easier way to achieve creating a class that calls the 2 stored procedures that I have that i would be able to then link them with an objectdatsource?
I have a storedprocedure as a datasource for my crystal report (14) and would like the report to define one of the parameters internally (in the report definition), When I set the default of the parameter to True (its a bit in tsql) and set it not to prompt it still does.
I don't want user intervention here, and I have my viewer as a dialog (so they couldnt enter it even if they wanted to).
I am currently having a headache on how to solve this problem that i am facing. here is the situation: I have a combobox and a list box on the main form. The combobox will get the data from the ms access database. In the database, i have the details of a person's IC, Name and DOB say for eg on one entry I have D215311523C,SHAWN,13/04/1987 So now, my combobox on form load will show the list of dates in the database to allow the user to search base on the date itself by clicking on the selected date. So when the user clicks on the particular date say 13/04/1987, people in the database whose birthday is 13/04/1987 will be shown on the listbox.Meaning to say if i have 3 entries whose dates are the same 13/04/1987, 3 entries will appear. If there is only two entry, then two results will be shown. But now, when i do a single click on the date, one result will be shown. That is correct. But the problem is when i click on the same date again, three of the same results will be shown on the list box. that is it will display : 13/04/1987 13/04/1987 13/04/1987 which is not the case. Then it will show more duplicates of the same results if i click more times on the same date which should not be the case.
Dim n As Integer Dim numbers() As Integer Dim StartFrom As Integer Dim EndAt As Integer
I am using a datagrid in my where i am having four columns. In first column the parameter values are entered and in the second column measured value is entered and in third column the nominal value is entered.Inthe fourth column the result is displayed by subtracting the measured value and nominal values. I am doing this calculation in Datagrid cell validated event. What i want is,there will be many rows in the grid,when typing the value in the third column the corresponding result will be displayedin the rowof theresult column,save button will be displayed while the form loads,when the calculate part is completed that is there should not any cell of the resut column empty then i should enable the save butto.
I am encountering the following issue So i have a device that sends stuff at the serial port, i then parse it and put it into an array of bytes like that:
Dim HCI_Command_Rcvd_Byte() As Byte All good till here What i wanna do is make an array and put this result every time the serial port gives me a new result, for example:
[Code]...
Basically what i wanna do is let the port parse the messages, fill in the array with the result at an empty spot in this array and then i will have a separate thread that will look in into this array in each non empty space and after it looks into the non empty space it will use or discard the info and also mark this space as empty (after it checked)
I am getting an ArgumentOutOfRangeException when I try to run the following code,[code]the table that is being read has a single row of data, the database and connection are fine as I can run INSERT/UPDATES etc but wherever I have used a datareader I am getting this exception each time on the "Using reader As MySqlDataReader" line.
I am using Microsoft visual basic 2010. I am using the following code to connect to a local access database. After the line myReader = cmd.ExecuteReader () no code runs. I am not receiving an error message.
Dim connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;data source=C:UsersmikeDocumentsFCE_Database.mdb"
[code]....
I have used this method to connect to the same database multiple times in the same program without a problem I've also tried using OleDb with the same result.
I am executing stored procedure using ExcuteReader() command. If I execute Stored Procedure in SQL server it is taking 2 secs. But in code taking around 2 mins. I tried DataAdapter.Fill(). Still the same.
