Get The Number Of Rows Returned By A OleDbDataReader ASP.NET?
Jun 18, 2010After connecting to a database using DataReader, how can I count the number of rows ?
View 2 RepliesAfter connecting to a database using DataReader, how can I count the number of rows ?
View 2 RepliesDim query = (From p in Parent _
select _
p.ID, _
Tags = String.Join("|", p.Child.Select(Function(c) c.Tag.TagName).ToArray)).Take(100)
In the above query, when using Take to limit the rows returned, a separate SQL query is executed for each row to return the 'Tags' field. If I remove Take(100), a single query to sent to Sql Server.So, how do I limit the number of rows returned, while preventing a new sub query being executed for each row?
I have a model that returns a dataset to a view and builds a list. The crazy thing is that I have tested this code with IE, Safari on Mac and Windows, Chrome and Opera and all return data. However, on the iPad or iPhone, zero rows are returned from the dataset object. It seems that the model is in fact passing the dataset to the view. I am using jquerymobile to render the view for the iOS devices and have taken that out of the mix to test and it still doesn't work.
[Code]...
I'd like to know after I've executed MySqlReder = MySqlCommand.ExecuteReader() how many rows it returned. If it's one I can continue processing with the data. If it's more than one I need to populate a drop down list box.
View 6 RepliesI am currently writing unit tests for an application near completion (before management looks at it and turns it inside out). I am testing the business layer and a method is set to return a datatable of all "GroupID"s, which are simply an integer to represent the group that a user belongs to.
I'm assuming the best way to assert on this unit test would be to assert that the correct groupIDs are being returned from a controlled test database. However, I'm not sure how to assert on a datatable. Is the only (and best) possible way to accomplish this to simply loop through the datatable until it's empty and add each value to an array of integers? How would one go about asserting on this test?
When I query a DataTable using LINQ, are the rows returned as references? Either way, is it possible to control this behaviour, so that rows are either returned as references or as new rows?My guess is that all objects are returned as references by default, since that seems to be the normal behaviour in most programming languages.
View 2 Replieswhen populating a data grid i keep getting a redundant row in the bottom. is there a way to lock grid rows to the number of rows in the data table?
View 1 RepliesI am currently using DevExpress 10.2 within Visual Studio 2010. In a previous question I was trying to print the current user view of a DevExpress GridControl with the user's choice of expanded or collapsed master rows and/or group sections. I was told this was not possible at this time. I have now decided to use the following code:
[Code]...
I'm trying to access the Count Property on the array of rows returned by the datatables select method, this is after converting the Web Project to 3.5
View 2 RepliesI have been playing around with datareader for a little while, and I can't figure out how to get the number of row returned? [code]...
View 7 RepliesHere's my
Module Module1
Dim Board(3, 3) As Char
Dim PlayerOneName As String
Dim PlayerTwoName As String
Dim PlayerOneScore As Single
[Code] .....
How can I make it come up with no error when no coordinate has been entered, basically instead of a number being enter, the return key is just pressed.
I have an application that reads the output from a process running the "Net View" command. How can I determine the number of lines returned by the process so that I can dynamically set the upper bound of a "For Next" statement?
View 12 Replieshow do i count the number of rows that are affected when I updated a table, and display the number of affected rows in a message box ??
here is my code for updating the table ...
For Each row As DataGridViewRow In DataGridView1.Rows
req = row.Cells(Column1.Name).Value
If row.Cells("Column1").Value = True Then
[Code].....
Here is the code:
Function getData(ByVal id As String)
Dim reader As SqlClient.SqlDataReader
Dim statement As String
[code].....
Is it possible to number the rows in DataGridView ( does this property exist)?
When I load the data from the database to DataGridView I want to show thenumbers of row. like this
0
1
2
3
.
I have a VB report which contains a list of locations. I have this list separated into areas and I need to count the total number of rows per area section. I have a groupHeader which contains my area field, then in the group I list the corresponding entries for that area. Then in the groupFooter I would like to give the total number of entries in the group. How can I do this? I have two fields in my groupFooter
groupCount
groupTotalAmount
I am using a tableadapter to connect my project to an MS database. I need a a function which counts the number of rows in the table for something which I am doing. I have sucessfully used the count function to count the number of rows for my other tables, but when I tried to reuse it for another table, it wouldn't work. I get an error...
An unhandled exception of type 'System.ArgumentException' occurred in System.Data.dllAdditional information: Input string was not in a correct format.Couldn't store <AH25> in ProductCode Column. Expected type is Int32.
and this is the code which I used
Dim record As Integer = TAProduct.GetData.Rows
Do Until record = TAProduct.GetData().Count
' other codes
loop
It only seems to work if the first column is an integer datatype, which is the case for my other tables, but the table which I am currently dealing with using a string datatype. Is there another way to count the number of rows without using SQL statements or can I adapt my existing code in some way?
I am currently having trouble detecting the number of rows in the table in sql database. I have one column as auto increment, and one column that will show the blkname. But everytime I delete off one row, the program cannot run saying that there is no row at position "up to the latest number". Then, when I try to insert back the row again, the program also gives me the same error. I think the program probably cannot detect the number of rows correctly as it cannot like detect if there is 5 rows in the database and if you delete one row, it will give me the error. The above method is the same if I used the auto increament column and without.
The code that I have wrote so far is :
'AUTOINCREMENT
Dim n As Integer
Dim inc As Integer
Dim numbers() As Integer
Dim StartFrom As Integer
Dim EndAt As Integer
Dim MaxRows As Integer
MaxRows = ds2.Tables("CustDetail").Rows.Count
[Code] .....
I want to get the number of rows where col1 is Null. datatable.compute(count("col1"), "col1 Is Null") always returns 0, and I am sure there are more than 1 rows with col1 is null.
View 2 Replieshow would you select a row in a datagridview if the number of rows = 1
View 6 Repliesi have a table name employee_log...and one of the column name is enroll_no...i just want to count the number of rows of that table ....and display that result ie integer value in textbox..... i used count function but i dun the syntax...
View 2 Replieswhat is the difference between OledbDataReader and OledbDataAdapter?
View 5 RepliesWith ms access as the database storage software. And if you know of other ways on how to read data base on a certain criteria and displaying the results that meets the criteria.
View 1 RepliesI'm getting an "index out of bounds" exception and I can't figure out why. Unfortunately, my VS 2010 is in Spanish, so I can't say what the exact message says, but it's a System.IndexOutOfRangeException.
This is a table with a column holding Double values and a column with Date values. I have a form with two DateTimePicker controls, so the user can set a date range and they should see a number showing the total amount calculated between those two dates.
I did something like this:
Private Sub getData(ByRef total As Double)
Dim connection As OleDbConnection
connection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data
[Code]......
I am building an app to read a customers .xls file in to a array list the array is the being reordered and im writing a file out the back end.its doing several lookups in the .xls file to see if relivant data is there and it writes a different file (9 different specs) depending what is in each line/column.Sound simple and I have the app working great however when I use a customers live data I get an ex.message = "Could not decrypt file" the file opens in excel witthout any password prompts however it does look like the sheet is write protected but all im doing in my app is reading the data.
Using fileConn As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & OpenFileDialog1.FileName & "; Extended Properties='Excel 12.0 Xml; HDR=yes; IMEX=1'")
fileConn.Open()
[code]....
What is the difference between OleDbDataReader & OleDbDataAdapter? What are there main functions? And what is OleDbCommand and what is the function of it?
View 1 RepliesSimple question but it is killing.
How do I write an expression, that return the number of rows where a column is equal something.
I can get the total rows like this: =Count(Fields!Foo.Value) and RowNumber("Rapporter")
But I can't get the number of rows where Foo is equal to someString
Foo is a type string.
I am trying a small application here. It is a windows mobile application. I have to create a form with one drop down and a datagrid.Once a value is selected in the dropdown. The focus goes to the data grid.I know before hand that there is only one column. But I dont know how many rows the user will enter.When the foucs comes to datagrid then one row is created where the use will enter a number. When he hits tab or enter a new row is created and the cursor goes there and the user can enter second number. When he tabs or etnerts a new row is created. This should go on until he presses Save button when all these values will go in the database table.
View 3 RepliesI am having trouble Counting the number of rows in a specific column in a datatable.
View 2 Repliesi have a Dataset command (DELETE FROM TABLE Where Name =@name)On my winform i have a Delete button that it deletes the rows, next i want to display the number of rows deleted to a msgbox, what i get now is 0this is my code:
Me.NetworkErrorsTableAdapter.Del(par)
MsgBox(" " & Me.NetworkErrorsTableAdapter.Del(par).ToString & " records deleted ")