My project is a standalone application with lots data retrieval and sometimes data update.No SQL server or connection provided)Here is sample code
Dim objDS As New DataSet("Quesetion")
Dim dtBook As DataTable = objDS.Tables.Add("Book")
Dim dtChapter As DataTable = objDS.Tables.Add("Chpater")
[code].....
I have a simple scraper. It works on some websites, but on some there is this Error:
Quote:
IOException was unhandled Unable to read data from the transport connection: The connection was closed
It is occuring at "Dim htmlresults As String = Urlcontents.ReadToEnd()".
'Create the HttpWebRequest object
Dim req As HttpWebRequest = WebRequest.Create(URL)
'Set the timeout to 1 second (or 1,000 milliseconds)
req.Timeout = 10000
[code]....
I want to select to multiple sql tables using select query in vb.net..I have 2columns in sql table..I have tried this query.. But i'm getting error.
TextBox11.Text = Val(27)
cmd = New SqlCommand("SELECT outside,power FROM vijay21 INNER JOIN vijay22 ON vijay21.outside=vijay22.outside WHERE outside BETWEEN " & Val(TextBox11.Text) & " AND " &
[code].....
I am using VS2008 and SQLite. I have created a database and several tables and am attempting to populate the tables with data from arrays.
The following code (example) works fine but stops after it inserts 30 to 50 records. I am running the VB code in debug mode and when it stops, I press pause to see where it is. It stops on "SQLcommand.ExecuteNonQuery()" and when I press continue (F5) it will insert another 30 to 50 records.
I do not get an error message. Is this a timeout issue? How do I keep the loop running to the end of the array?
Following is example code.
Dim
SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLiteCommand
CODE:.....................
Dim cn As String = ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Database genk.mdb;")
Dim SQLString As String = "SELECT * FROM Products"
Dim DBConn1 As System.Data.OleDb.OleDbConnection = New System.Data.OleDb.OleDbConnection(cn)
Dim DataSet1 As New DataSet()
Dim DataAdapter1 As System.Data.OleDb.OleDbDataAdapter = New System.Data.OleDb.OleDbDataAdapter(SQLString, DBConn1)
[Code]...
When the user clicks the button the all the data in my Products table is displayed on a datagrid. How can i put the data inside my Products table into an array so i can manipulate my fields to undergo quick sort.
I have a table called PARTS and table called PARTEXT.
PART has:
PartID
PartDescription
PartCostPrice
PartSalePrice
PARTEXT has:PartID
PartImagePath
For some reason (please don't ask me why) the designer of the database splitted the tables.I need a sql command to "combine" between the two tables by making new View, so it will show the content of the PART table and in each row it will get the PartImagePath of the same PartID that both tables have.
I have a combobox in my form which I want to fill with data from one column in an SQL database. Any idea on how I do this?
View 1 RepliesI typed this question once already, hit preview, and somehow never got the preview and lost what I typed. It has been that kind of a day.So here is my quick overview then I am going shopping. I am using OLE DB to select from an excel spreadsheet. It has over 15000 rows and 33 columns. Sometimes even when a cell is not null, it is returning a null value. If I just do a "select * where [termination date] is not null", for example, it will return no rows even though I can see with my own eyes that sometimes termination date is not null.
View 9 RepliesCan any one provide me the link or give me an idea how to read all the tables returned by SQL Stored Procedure?
My Stored procedure returns two tables:
ID Name
-----------
1 Jeff
2 Joe
ID Pages
----------
1 2
i want to read data from both of these tables. I tried using SQLDataReader and then populating into datatables but then i can only read the values of 1st table. I want to read both the table values. How do i do it? please let me know if you guys have any ideas how to deal with this.
perviously i use ms access (.accdb) as my database, my sql connection is Dim connstr As String = "Provider=Microsoft.ACE.OLEDB.12.0;" & "Data Source = LibraryDatabase.accdb" now i have add a new customer.mdf with tables in my project, but what is the script for sql connection for (.mdf)?
View 1 RepliesIs there a way that I can vew the tables once I have connected to an open connection?[code]...
View 2 RepliesI have a data grid view on a form which is currently filled with the following query:
SELECT TopicCode, TopicName, NoOfCourses, Lev FROM tblTopics WHERE TopicCode = @TopicCode1(Where I obviously pass a TopicCode parameter)
However, I have added two custom columns to the data grid view, and the values that i want be in here are in a different table than the query i'm using to fill the data grid view.is it possible to "nest" queries? which will allow me to select fields from two different tables?
Example:SELECT TopicCode, TopicName, NoOfCourses, Duration, Lev FROM tblTopics AND SELECT StartDate, EndDate FROM tblSubscriptions WHERE TopicCode = @TopicCode1
Possible? or not?
It is possible to check two different MySQL tables from the same sub?
For instance:
Dim Connection As MySqlConnection
Connection = New MySqlConnection
Connection.ConnectionString = "server=server; user id=userid; password=password; database=database"
Try
Connection.Open()
[Code]...
What I'm trying to get is something like an "or" function. If TextBox1.Text isn't in the database, then check if TextBox2.Text or TextBox3.Text is in the database.
i have more than 10 table but same column names i need to collect datas from these table for example i need to select name column from 10 tables how to do this
View 8 Replieshave a datagridview containing 2 tables left joined, so that:table1 LEFT JOIN table 2 ON table1.id=table2.idI get an error whenever I try to edit my datagridview."invalidOperationException was unhandled by the user codeDynamic SQL generation is not supported against multiple base tables."The error points to this line:
da.FillSchema(dt, SchemaType.Mapped)
da.Update(dt) << This line
'da = dataadapter
[code].....
I have a program that connects to an ODBC tables (3 of them) and I use select .... Left join etc Where ... etc. The issue I have is the connection takes about 20 to 25 seconds to complete. I'd like to create some status message so the user knows the system is not actually hung. Using Visual Studio 2010 Ultimate, VB.NET, ADO 2.7.
View 1 Repliesthere are three tables in dbf , table1,2,3 respectively all are contains similar structure but different data Structure : S.no Quiz Question i want the query which select the Quiz Question/records through user given Range from Textbox1.text to Textbox2.text
View 3 RepliesI have a form with a list box The code loops through a Tables' row and gives me only one of each of the catergories. If more than one of a perticular item exist it only displays one. i would like to use Select Distinct instead just because it would cut down on the time it would take to read the Rows items and still give me the same results I just am not sure how to write it.
[Code]...
I have been trying for days now how to create a process to the user to easily create a connection to any installed data types they have installed. I have found an example right inside vb2008. I never use this because I code my own connections, but this would be real nice if I could include it or duplicate it.
View 1 Repliesi need a little advice/help here. There is a particular scenario that is coming up and I am clueless as to how to go about it."I will soon have a lease line through which I will get realtime stock market data. This data will be available every second and it will contain prices of stocks. Now assume I am able to get that data on my local computer. How can I transmit data so that users can get that data through my software.
For e.g. assume it's 11 AM. Now if you select a stock e.g. Google, then my program should fetch data for google till 11 AM and also show new data every second or so with minimum lag. Something like a terminal where you see stock prices getting updates every second. In my case I need to get past data and show current data which get updated at short intervals."
Now I have a linux vps webserver which hosts my site. (I get one or two static ip free) What to do so that data goes from my local computer to my server and then my program (developed in vb.net) is able to get it and show it to end user. This whole system should such that its fast (real-time) and delay is minimum.
I have three tables Student, TimeSheet and TimeRecord.
Talbe columns:
Student : StudentId, FirstName,
LastName
TimeSheet: TimeSheetId,StudentId, IsActive
[Code].....
I am looking to select all the tables from a microsoft access database. I just need the SQL statement i think, i can connect to the database that is needed.
View 4 Repliesin below code there is syntax error in from Clause but i think every thing looks fine iam using access database thx and relation is fine between thes two table
Public Function GetGridData() As DataTable
Dim dt As New DataTable
Try
[code].....
How do I strip out the data source from the connection string so that I only have the directory path and file name.
My connection string is thus:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents and SettingsMartinMy DocumentsVisual Studio 2008ProjectsRestelRestel IIRestel IIRestel.mdb
I am trying to send messages from my application to a yahoo account and I am getting the following error:failure sending mail..Unable to read data from the transport connection: net_io_connectionclosed.Is this because of the LAN and work or something else/ [code]after the line mailobj.send executes it stalls for a while and then the application ends.I checked all the parameters and they seem correct
View 4 RepliesFor my app users can enter a SELECT statement themselves. This can be any select statement at all, it will be mainly used for creating a quick view e.g. SELECT * from table1 LEFT OUTER JOIN table2 on table1.id = table2.id.
Whatever this select statement maybe I load it into a datatable (after checking for no nasty stuff of course) in vb.net. I want to know the table names so I can query the database again for validation purposes on things like datatypes etc.
da.SelectCommand = New SqlCommand(sqlStatement, tempDB.Connection)
da.MissingSchemaAction = MissingSchemaAction.AddWithKey
dt = New DataTable
da.Fill(dt)
For my app users can enter a SELECT statement themselves. This can be any select statement at all, it will be mainly used for creating a quick view e.g. SELECT * from table1 LEFT OUTER JOIN table2 on table1.id = table2.id.Whatever this select statement maybe I load it into a datatable (after checking for no nasty stuff of course) in vb.net. I want to know the table names so I can query the database again for validation purposes on things like datatypes etc.
da.SelectCommand = New SqlCommand(sqlStatement, tempDB.Connection)
da.MissingSchemaAction = MissingSchemaAction.AddWithKey
dt = New DataTable
da.Fill(dt)
I have made a PRN file using the "Print to file" option, and now I want to make a VB.net application that will print it directly to a TCP/IP printer which is not currently installed on the computer. Is it possible to achieve this by simply opening a connection to the printer's IP and sending all the bytes of the PRN file to it, or is it more complex than that?
View 3 RepliesI would like open form and only display data in listbox without ability to select record. How to do it?
View 1 RepliesThe next step is I need to build a randomizer to randomly select a row and read the columns of that row into varibles.I have a working randomizer that can randomly pick a number between min and max values but what I don't know if how to select a row / How to find out how many rows are available and how to read the values into varibles.Am I right in declaring an Integer Varible then using:
AvailableRows = DDT.Rows.Count
Then use my Random Function to pick a number between 0 and AvailableRows
