Pgreader Returns No Rows (the Parameters Are Right And The Database Contains The Data Too)?
May 12, 2010
I have a postgresql database, one table. This table has a date column too.And I have this code:
[code]...
The problem is, that the pgreader returns no rows (the parameters are right and the database contains the data too).firstday and lastday are f.e. '2005.05. 01.', the ConvertDate function converts the date to '2005-05-01' (the dates are storen in this form in the database)And when the commandtext="select * from arfolyamok where datum between '2005-05-01' and '2005-05-31'", then it works, the pgreader has the rows.Why? What make I wrong?
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Jan 12, 2012
I want to create a webservice which returns me 2 parameters in VB.net
redirect URL if the user is authenticated OR Error occured text
I am able to create a webservice which sends only one parameter that is either URL or error msg.
Both are strings.
how to pass above 2 things and retrieve them in application.
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Jul 8, 2010
I'm trying to update an Access database by using an OLE connection, retrieving the information from textboxes where the user enters the new information.All the fields in my Access table are required fields, so I have validated that some info is entered in each one of the textboxes and that is the correct data type.But when I run the update query I get an error message saying something like values haven't been entered for some required parameters (my Visual Studio is the Spanish version, so I can't give the exact error message in English).The bit of code where the error occurs is inside the procedure called by my "Ok" button:
Dim campo1, campo2, campo3, campo4, campo5 As String
Dim campo6, campo7, campo8 As Double
Dim campo9, campo10 As Integer
[code]....
(I didn't post the whole code inside the procedure, but of course I'm creating the connection and everything)
The table has 10 fields, and the data is read from the textboxes and stored in variables (campo1, campo2, campo3, etc.), which I'm then using in the "set" query command.
"id" is the first field from the selected row in the datagrid, which I'm sending as a parameter to the procedure called by the "OK" button.The error message shows at runtime, so I'm guessing it's something in the query. Am I writing it correctly?
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Jun 9, 2011
I have been posting almost 4 questions now where I have received 2 answers being solved. These are simple questions which any one familar with VB.Net can solve easily. Please understand, I'm a newbie to VB.Net.
Now my next issue is; I have a a form which has text boxes from where the user has to enter the data for the MS Access backend. I am getting the error as INSERT SYNTAX Error when entering the data and clicking the Save button. What is wrong with my insert statemnet below which is at the click even of the Save button?I desperately need to get this application working.
[Code]...
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Apr 12, 2012
I have the following function:
Public Function CheckHasRoom(people_id As String, semester As String, year As String)
' Don't let folks already registered for a room register for another.
Dim RoomSelected As String
[Code]....
But it is bugging out at hasroom.Any() saying, "Input string was not in a correct format." Any thoughts on why? This is returning a collection of rows just like where I use this same code elsewhere without issue?
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Aug 16, 2010
I have a form that i want to be saved to my database. The form is adding a new record to my sql server 2005 database but it is not bringing the text over with it. The new record in my db is just an empty row. Here is my code.Add to database section ( i have removed the connectionstring for privacy reasons)
<%@ Page aspcompat="true" Debug="true" %>
<html>
<head>
<title>Form to database</title>
[code]....
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Jul 19, 2010
I have created a strongly typed dataset in the VS 2005 Dataset Designer. There are two tables that relates to each other in a one to many relationship: Claim and ClaimDetail. The designer automatically creates a function GetClaimDetailRows which returns all ClaimDetailRows for a ClaimRow. Why is this Array's length always 0? Because ClaimDetail contains more than 40 Million rows, i did'nt fill it before i call GetClaimDetailRows but had configured it's selectcommand that it takes a parameter idData to fill only the related records. But that seems not to work because the ClaimDetail-Datatable is empty.
The automatically generated function in the ClaimRow-Class which returns all related ClaimDetailRows:
Public Function GetClaimDetailRows() As ClaimDetailRow()
If (Me.Table.ChildRelations("Claim_ClaimDetail") Is Nothing) Then
Return New ClaimDetailRow(-1) {}
Else
Return CType(MyBase.GetChildRows(Me.Table.ChildRelations("Claim_ClaimDetail")),ClaimDetailRow())
End If
End Function
When debugging I see that it jumps into the else block but returns 0 rows. Do I have to fill the Claimdetail-Datatable first(ClearBeforeFill=True) for each Claim? But then I don't need to use this function anymore. I now fill the Datatable(ClearBeforeFill=True)before i call the Child-function and it works. But I don't understand why it could not throw an exception(optionally) when I try to acess a child-relation without having that datatable being filled(at least with 0 rows). Instead of that it returns 0 rows what can be correct or incorrect and is difficult to detect.
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Mar 7, 2012
The following VB line, where _DSversionInfo is a DataSet, returns no rows:
_DSversionInfo.Tables("VersionInfo").Select("FileID=88")
But inspection shows that the table contains rows with FileID's of 92, 93, 94, 90, 88, 89, 215, 216. The table columns are all of type string.
Further investigation showed that using the ID of 88, 215 and 216 will only return rows if the number is quoted.
i.e. _DSversionInfo.Tables("VersionInfo").Select("FileID='88'")
All other rows work regardless of whether the number is quoted or not. I understand that the numbers should be quoted just not why some work and others don't?
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Oct 24, 2011
I am using the OLEDB adapter (Oracle OLEDB) with Oracle 10.2.0.3.0. My code generates the SQL for the query, then when I execute it into an OLEDBDataReader, the HasRows is False. However, if I output the contents of the query string, copy, and paste into SQL+ (logged in as the same user from the same client machine), it returns 993 rows. What gives?? Here's a segment of my code:
[Code]...
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Dec 15, 2010
I'm trying to run a simple select statement using an ADO recordset. But the resulting recordset returns 3 times the number of rows. For example the query should return 20 rows but is repeating 2 more times and returning 60 rows. When I run the query in Oracle it returns 20 rows.
Here's the code.
sSql = "Select * from Sector"
cnnOracle.Open("DRIVER={Microsoft ODBC for Oracle};SERVER=REPDATA.world;UID=auser;PWD=auser;")
[Code]....
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May 13, 2011
I'm writing a query to select all records that has any part of parameter. I have one table called Employees. Some people have name like this: John David Clark If the parameter is
[Code]....
I should be able to get result back as long as there's a match in the parameters. If I use Function Contains (q.FirstName & " " & q.LastName).Contains(employeeName), I will not get any result back if employeeName is "John Clark" Function Contains looks only for next words from left to right. It doesn't match a single word at a time. So that's why I used this in the Linq to SQL:
[Code]....
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Nov 7, 2010
check the VB behind code for any syntax errors.
Unable to add new rows of data to a database using the DataGrid control.
Compilation Error message is located at [URL] View snap shot images of each line error at [URL]
The VB code behind reads (revision 1.3):
</script>
<body style="font: 10pt verdana">
<form runat="server">
[Code].....
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Oct 25, 2011
I have a vb.net app that I can read a .xls file into a dataset or loop through as oledbdatareader and it gives the same result.Some of the rows have all nulls when I loop through them but if I open the same file in Microsoft Excel I can see that row fine.[code]From the info above the first two SKU values would come through fine but when I get to the 3rd row it would show a null.Is it possible that it kind of inherits the first rows type and since the 3rd row isn't all numeric if nulls it? [code]
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Jan 4, 2012
I am trying to select multiples rows from a database table and insert the text into several "label" controls. For example, if the database search returns 5 results. then insert the first row's text into label 1, the second row's text into label 2, and so on. The number of rows will be variable. I was thinking of a while statement. I am having a problem understanding how to even seperate multiple rows from a query in VB. Would using an array for the query results be the right way to go? row one would be row(0), row two's text would be row(1), etc.
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Sep 26, 2010
i would just like to ask how do i retrieve data rows in my table in my database randomly... i was able to create an online quiz wherein it displays the question,choices in consecutive order but what i want is, every time when user will start a quiz it will show questions in random order. I am using mssql 2005 as my database below is my code.. a
QuizPage.aspx
<asp:DetailsView ID="questionDetails" runat="server" AutoGenerateRows="False"
CellPadding="4" ForeColor="#333333"
GridLines="None" Height="50px" Width="550px">
[code]....
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Jan 31, 2012
I need to count how many instances or rows there are which have a specific value in one of the columns.
For Example:
the column "Ready" is a YES/NO column in Access.
If 5 rows have that set as YES and 7 have it as NO
how do i count how many have yes's and how many have no's
This is mainly for the purposes of statistics
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Jun 15, 2010
I have an Access table in which I connect through ODBC commands. I want to delete the 50% of data rows from it. Can anyone knows a string to write for doing that? ALARMLOG is my table. In MS SQL I tryed succesfully the following command :
[Code]...
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Sep 15, 2010
I have been trying my hand at this for some days now and just cant get anything to work. Below is the code im currently using to delete a row from a database table, the problem when trying to build the project line 5 is giving this error about the value con" Value of type String cannot be converted to 'System.Data.OleDb.OleDbConnection' "
Dim con As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=Customers.mdb"
Dim cnn As New OleDb.OleDbConnection(con)
cnn.Open()
[CODE]...
I have also tried using this code below, but to no success. Im basically just looking for something rock soild that i can use to accomplish this task. Been stuck on this for quite a while now.
CustDetailsTableAdapter1.Connection.Open()
Me.CustDetailsTableAdapter1.Delete(txtDelCustN.Text, txtDelCustSname.Text, txtDelCustTel.Text, txtDelCustAddr.Text)
CustDetailsTableAdapter1.Connection.Close()
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Jul 27, 2010
when 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?
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Sep 1, 2011
Can anyone tell me why "Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound." I keep getting an error "Invalid Operation Exception was Unhandled" error. All I am attempting to do is allow the user to select products from a list(or a second datagridview) and have it added to the datagridview so they do not have to type in every cell since the other cells are not visible because they do not purtain to their needs. Plus they will be able to save all items at the same time.
[Code]...
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Sep 13, 2011
I have two datagridview's both are databound. First one shows items for sale and the second stores all the items that were sold. I am trying too transfer selected rows from one to the other but no matter what I keep getting told "Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound."
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Jul 22, 2009
Is their a more elegant way to assign a space to a value, if a database call returns null for a data set column? I am doing the following check which is pretty tedious:
If (ds.Tables("employee").Rows(0).Item("txtNamePrefix").IsDBNull(0)) Then
txtNamePrefix.Text = ""
Else
txtNamePrefix.Text = ds.Tables("employee").Rows(0).Item("txtNamePrefix")
End If
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Aug 19, 2010
Here is the code:
Function getData(ByVal id As String)
Dim reader As SqlClient.SqlDataReader
Dim statement As String
[code].....
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Aug 11, 2011
I have been given the task of calling a web service which returns an xml data feed which I am doing like so:
For Each r As DataRow in SomeDataTable
Dim msFeed As String = string.format("[URL]?param={0}", r!SOME_VAL)
Dim x As XDocument = XDocument.Load(msFeed)
Next
This is all fine but as you can see x just gets overwritten with every iteration. What I need is create an xDocument and add each feed from my loop but I am unsure how to proceed.
Solution
Dim xAllFeeds As XElement = New XElement("Feeds")
For Each r As DataRow in SomeDataTable
Dim msFeed As String = string.format("[URL]?param={0}", r!SOME_VAL)
Dim x As XDocument = XDocument.Load(msFeed)
xAllFeeds.Add(x.Root)
Next
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Mar 2, 2010
I'm using following code to receive content of a ListBox
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Jul 13, 2009
I did the following
Imports System.Data
Imports System.data.OleDb
Public Class Form1
Dim con As OleDb[code].....
By this i can fetch only one row(the last row) of the access....how to modify the above code to fetch all the rows starting from the begining from the database..........
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Jan 19, 2012
The new command text returns data with schema different from the schema of the main query. Check your query's command text if this is not desired. I am getting this warning, whenever I add a query in a Strongly Typed DataSet which returns a single column.
Ex
SELECT DISTINCT Building
FROM Room
ORDER BY Building
When I give this query it will show me a warning. Because warning leads to a constraint error when ever i call the same function in a windows form.
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Sep 5, 2011
Which one of these two ways would be more recommended to update a database with a given query string:
Option 1:
Dim query As String = "INSERT INTO employee VALUES (@Name, @Age)"
Dim command As New SqlClient.SqlCommand(query, sqlConnection)
Dim params As SqlParameter() = {
[Code].....
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Jul 28, 2011
I am working on a front-end application program and cannot figure out what is giving me this error. The program is accessing an Access Database and filling a text box on the form. The error i keep receiving is "Index out of range", "No row at position 0". I have information in the data table, and when I type the select statement into a query in Access, it returns the information in the data table.[code]...
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Jan 18, 2010
Imports
System.IO
Imports
System.Windows.Forms
Imports
[CODE]...
I don't understand why nothing is being returned from the SQL)
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