I am trying to create a Web service and I was able to create one using a simple query.ow the query I want to use is below but I am getting a syntax error. The old query used one inner join but this one uses two inner join and a left inner join What am I doing wrong?
Dim ds As New DataSet()
Dim oAdapter As New OleDbDataAdapter
Dim sQuery As String = "SELECT c.pkPersonnel," _
[code].....
filling an OleDbDataAdapter.I have:
Dim cmd As OleDbCommand = New OleDbCommand(myQuery), myConnection)
Dim da As OleDbDataAdapter = New OleDbDataAdapter()
Dim dtDonnees As DataTable = New DataTable()
da.Fill(dtDonnees)
Filling takes too much time.For 20 lines it takes 20 seconds.And for 130 000 it takes a little more (but not 130 000 sec).But 20 seconds is too much anyway.
Question part 2: can I skip fill?I mean, after filling the datatable, I do a for each row of datatable and cast into an entities:
Dim returnList As New List(Of myObject)(dtDonnees.Rows.Count)
For Each rowDonnee As DataRow In dtDonnees.Rows
returnList.Add(New myObject(rowDonnee))'set every data of the row into my new object
Next
Can I pass each row of OleDbDataAdapter?
I am unable to fill data in the OleDbDataAdapter I get an OleDbException with the following message Syntax error in FROM clause.at this line adapter.Fill(dataset, "User")
Here is the code
Imports System.Data.OleDb
Public Class Form1
Public connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:MyDatabase.mdb;Persist Security Info=False")
[code]....
and also I have tried
Dim adapter As New OleDbDataAdapter
adapter.SelectCommand = New OleDbCommand("select * from user;", connection)
Dim dataset As New DataSet
adapter.Fill(dataset)
But I get the same exception Syntax error in FROM clause
I am using vb.net 2003. In my program I access an Access database file via Jet 4.0 and OleDbDataAdapter.I have several tables constructed with text boxes that are filled with data using OleDbDataAdapter.Fill. This all works fine. When Integer data is displayed in the boxes it is shifted to the left as text. How do I format these textboxes when I am filling them with the Fill statement? I would like them numbers to be shifted to the right and have commas placed every third didgit.
View 3 RepliesI have an Excel worksheet "Tax" that contains two columns: PK_Tax and Percentage a bit like this:
PK_Tax Percentage
0.05
[code].....
I am currently trying to create a search function on a page in VB.NET which will allow me to search a database for a customerID from a textbox called txtSearch and then present it into a datagrid.
So far I can display the customerID's manually by using
SELECT * FROM Customers WHERE CustomerID LIKE 'A%'
but cant figure out how to replace the A with data which will be inputted into the textbox.
I have a field in a 2003 access database named first. I run the data adapter update command, gives me "Syntax error in UPDATE statement." I change the field name to firstName, try the update again, it works. I already have a bunch of programs using the database and using the field "first", do I really have to rename my field, go back and update all my programs to read from firstName instead of first? I really don't want to go that route if I don't have to. (provider=microsoft.jet.oledb.4.0)
*Edit: I meant to specify, I want the answer to use commandbuilder (but it won't work that way).
what is the difference between OledbDataReader and OledbDataAdapter?
View 5 RepliesI have been using examples from the textbook creating a OleDbDataAdapter using the wizard, everything works fine loading the data into the dataset, but when i try to update the dataset, it doesn't save tod the database, can someone please tell me what im doing wrong: I created the data adapter and dataset using the wizard, I binded all applicable textboxes. I do not get any errors the update command just doesn't save to the Access Database.
This is my code
Imports System
Imports System.IO
[code].....
I have had this headache for a few days now. Thought I had sorted it but haven't.I have copied worksheets from an excel workbook into a dataset, with each a datatable for each worksheet.
I then use a DataGridView to Display and edit the datatable.DataGridview.DataSource = MydataSet.DataTable(0) sort thing.But for some reason I just cant figure out how to write the datatable back to the excel worksheet.I have this but Im probably barking up the wrong tree.
[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 RepliesOkay so i have set up a database connection and got my combo box to fill from my table but it only fills with the first 4 records even though there are 5. There will be even more records depending on how many bookings are made so i need it to fill with all the records [code]...
View 3 RepliesI have an error at olapAdaptor.Fill(ds).It's out of memory error.I tried to dispose, set to nothing,... but no results. Can someone please look at my code and help me where I do it wrong.The code opens a database and exports all the tables in ascii format seperated by vbtab. The code is working, but now if I have a lot of tables to export.That's where the error bumps out.[code].....
View 5 RepliesI get this error if one of my database field is greater than 120 characters. The DB is set for 150 Char text.
When the form is loading here is the line that errors[code]...
I'm woking in aprogram that read sms from phone and show them in datagrid.berfore I link the datagrid to the database it read the show the message fine in the datagrid but now it show Error message
the code for the form load Code:Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0" & ";data source=" & Application.StartupPath & "SMS.mdb") Dim Mocmd As OleDbCommand = New OleDbCommand("Select * FROM TableMobinil", con) Dim myDA As OleDbDataAdapter = New OleDbDataAdapter(Mocmd) Dim myDataSet As DataSet = New DataSet()
[Code]...
It seems I've tried a million little variations of this and I keep getting the same error: "The SelectCommand property has not been initialized before calling 'Fill'
Imports System.Data
Imports MySql.Data.MySqlClient
Public Class clsDB
[code]....
I want to read an Excel sheet into a DataTable using an OleDbDataAdapter, however, I only want a section of the spreadsheet (the part that 'looks like a database').[code]
View 1 RepliesI have used OleDbDataAdapter to Update DataSet
In DataSet ,there are two RowData(or >2 RowData) will be Update
After I used OleDbDataAdapter.Update(Dataset),there are only one(expect last one) RowData have Updated ,and the Last one Rowdata not be Updated to the Database .
If the Dataset have only one RowData to Update ,It's allright,it will be update to the DB
The Database ,i use is Access2007 ,Who can tell me why this will happen
I need to update more than one DataAdapters, so I used the
Dim sqlcmdbldUser As New OleDbCommandBuilder(dtaadpUser)
Dim sqlcmdbldPoints As New OleDbCommandBuilder(dtaadpPoints)
But only one of them works, the second one brings up errors if I try to update the DataAdapter. Is there a way of using and updating multiple data adapters?
I am developing a VB.NET program to search for text in a specified column from a Datagrid. I am almost finished implementing this following the MS tutorial at:[url]But now I have just one compilation error:
[code]...
Also, I'm not sure if it is good to be declaring these variables new like this since I believe I already call them new elsewhere in my code.
Using NPOI and attempting to follow a tutorial here: [URL]..I'm coming across an "Object reference not set to an instance of an object" error at this line: sheet.GetRow(1).GetCell(1).SetCellValue("some test value")
when trying to use this code:
Imports System.IO
Imports System.Web.Security
Imports NPOI.HSSF.UserModel
Imports NPOI.SS.UserModel
Imports NPOI.SS.Util
Imports NPOI.HSSF.Util
[Code]...
Yet the question is still open...why didn't the code in the first example work? Do you have to declare every new row of data? What happens when you have lots of rows of database data?
i need to update my data using stored procedure here is my code :Try
con = getconnect()
con.Open()
sqlcmd = con.CreateCommand
[code]......
i coppied some code from HERE but i'm getting an error: "incorrect syntax near ')'. But i can't see anything wrong with this code
[Code]...
I am trying to connect a VB.NET 2003 Oledbdataadapter through the wizard to a SQL Server 2005 Database, but i get an error message during the wizard.These are my steps:New Connection, Select provider (Microsoft OLE DB Provider for SQL Server), Select Connection:server name, log on: use windows NT integrated security, select database. I do all these steps then click "test connection" and it is fine, but when I click "ok" and error message pops up."Unable to connect to database. It is only possible to connect to SQL Server Desktop Engine databases and Microsoft Access Databases with this version of visual studio."
View 3 RepliesIm just getting user to passing in varibles to SQL i have the below connection string and its throwing an error saying "The SelectCommand Property has not been initialized before calling 'Fill'
[Code]...
I have the following query that executes when my form loads. It's the rowsource for my combo box. The query is fine and populates the combo perfect, however, when i click into the combo box I cannot click out of it or even close the form. I have tried taking out the line of code that fills the form via table adapter on load and it works fine (opening the form unbound by the main table). Has anyone run into this before? I have another combo box on the form setup the exact same way and this is not happening. I've experimented with different datatypes etc....
code to populate combo box:
Public Shared Function LoadCallSource() As String
Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents and Settingsdiw07My DocumentsDaily Backupsphone memo backend.mdb"
[code]....
If I take out the line
Me.MemoTableAdapter.Fill(Me.Table_Memo.Tables("Memo"), intMemoID)
The Combo boxes do not act up or "Lock"
At the top of my code for the form I have the following statements (and some other unrelated ones to):
Dim LastDataRow As DataRow
Public Event RowChanged As DataRowChangeEventHandler
When my form loads I run the following line of code:
AddHandler dt.RowChanged, New DataRowChangeEventHandler(AddressOf Row_Changed)
After the form loads I have a FetchData button which connects to the database and brings the records into a datatable object. During this fill operation my Row_Changed event fires (for every record I think) and tries to run DataAdapter.Update(DataTable) (pseudocode) which ultimately fails because I haven't yet created commands. The error I get in my Row_Changed procedure is:
Update requires a valid InsertCommand when passed DataRow collection with new rows.I hadn't even planned to use an InsertCommand at all since I will not be allowing users to insert records from this form. I do plan to allow them to delete or modify existing records, but not insert new ones.run my AddHandler statement after filling the datatable. However, I'm trying to figure out how to rewrite my code so that I can refresh the datatable without closing out the form/application and having to open it up again. I think that's a problem for a separate discussion.
I've create a new VS 2008 Window Form Project using VB. I added an oleDbDataAdapter to the first and only form, set it to a table in my Access 2007 Database (there is only one table, PK field autonum of course and two Memo fields). The Database is in the Project's folder. A standard oleDb Connection object was created, as I expected, then I select the DataAdapter and choose 'Generate Dataset' which produces a standard DataSet called 'DataSet1.xsd'. Now when I build the project I get an error 'Error 1 Type 'FontTest.DataSet1' is not defined.' I do have a reference in my new Project to System.Data.So what the @#%$@ is going on? Why isn't the Dataset create by the DataAdapter being recongized? I can get into the DataSet Designer. The DataTable create is perfect, three columns defined correctly as I expected.
View 2 RepliesIn my connection code, I am getting the error: OleDbException was unhandled
[Code]...
I've tested this with .mdf and .sdf database files, both with the same error, thinking that the error has do to with the file type. If there is anymore information I could give you, I'd be glad to.
I created a dataset and i am using OleDbDataAdapter to insert new values to access database. But when i close the program and after open it, values are not in the database. How can i solve this problem? Also, i have another problem. When i write codes that
[Code]...
