How do I implement the ExecuteScalar method to return the first element in a sorted dataset?
Here is my code:Imports System.Data.OleDb
Sub Dim oCmd As OleDbCommand
Dim strConn As String
Dim strQuery As String
strConn &= "Provider=Microsoft.Jet.OleDb.4.0;"
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My Australian dates (dd/mm/yyyy) are being converted to U.S. date format (mm/dd/yyyy) despite using custom date specifier for Access table fields.Allen Lamb
View 1 Repliesi want to compare a column present in the access database BankAccount table with a field present in the form named as account......
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This is my first time inserting into a database using oledb and the with method. first there is a problem with my 'newrow' . iam getting an erro that says says object not set to an instance.Then there is my connection object.stuck.[code]
View 2 Repliesthe problem is my sql statement returns no data even tho the record IS IN the access database. Below is my
If RB1.Checked = True Then
comm = New OleDbCommand("SELECT * FROM Recipes WHERE (RecipeNo = '" & TB1.Text & "')", con)
End If
If RB2.Checked = True Then
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Every time i try to run this codei get the following error: "'System.Data.DataRow.Protected Friend Sub New(builder As System.Data.DataRowBuilder)' is not accessible in this context because it is 'Protected Friend'.
"
This is my first time to insert using oledb and the With method.
CODE:
When i try to run this code it give me an error:"'System.Data.DataRow.Protected Friend Sub New(builder As System.Data.DataRowBuilder)' is not accessible in this context because it is 'Protected Friend'.
Imports System.Data.OleDb
Public Class frmAddd
Dim daReservation As New OleDbDataAdapter()
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I posted this as a bug on MS Connect and am wondering if anybody else can verify the problem: I been beating my head against the wall for about 3 days and I don't think it is my problem.
Desktop computer - Vista 64 bit
Portable Computer - Vista 32 bit
vb.net 2010 express on both of them
I can not establish a connection to an Access db (either .mdb OR .accdb) on the 64 bit computer. When I try I keep getting a message that says "Format at the initialization string does not conform to specification starting at index 0." (this was typed not copied). (There are screen shots over on Connect).
I can establish a connection to a "Microsoft SQL Server Compact Edition" (.sdf) database on the 64 bit computer.I can estabish a connection to all 3 types on the 32 bit computer (.sdf, .mdb, .accdb).The 'funny' thing is that if I establish the connection on the 32 bit and copy the program directory over to the 64 bit, the prorgam loads and seems to run fine. But the %$# _(%* Wizard will not run on the 64 bit machine. Runs fine on the 32 bit but not on the 64 bit. Of course I make sure that the db's are in the location where the program expects them to be when I run the program on the 64 bit machine.
One final thing, when I am in the progam created on the 32 bit and running on the 64 bit and I try Data->Add New Data Source->Database->Dataset only two of the three connections show up while all 3 show up on the 32 bit machine. Also the connection string is incorrect for the non-sdf connection. It should include
I grabbed some sample code to generate 100 comboboxes at runtime. The short version of the code is shown below, I left out all the combo box fortmatting and placement details...
Dim TB1 As New ComboBox()
for loop
TB1 = New ComboBox()
Me.Controls.Add(TB1)
end loop
it produces all the comboboxes and looks fine, but i cannot figure out how to reference an individual combobox. Are they in an array? How do you single out a single combo box, for example, how would I check the value of the 33rd combo box?
I have written lots of code with the ADO Library in VB Excel and previous versions of Visual Basic. With the dissappearance of the recordset object, how do we perform data manipulation with an attached Access Database? It seems things could be a lot easier, and less complicated by now, however, the best methods appear to currently remain ellusive.
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I am working in Windows 7 Home Premium using MS-Visual Basic 2010 Express. I am having difficulty connecting to an Access 2007 database using ADO. When I try to connect to the database I get the following error:
Error Code: -2147467259
Exception: [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application
Source: Microsoft OLE DB Provider for ODBC Drivers
I looked at...
[URL]
There were several reference to compiling the program using x86.
Go to Project menu -> Properties -> Compile tab -> Select "Advanced Compile Options" -> Select "x86" instead of "AnyCPU"
I followed the path and there was not any option to select x86 in VB 2010 Express.
I am brand new to VB. I am using VB 2010 Express. I have a MS Access database and can read & display the data. However, when I enter a line of code to manipulate the data I get a "read only" error message in the project editor. I have checked the file and directory structures from windows and the command prompt. I have even used the "attrib" command to make sure the file was not read only. Then I put the following code in the form and it dispaly the read only message.
Dim infoReader As System.IO.FileInfo
infoReader = My.Computer.FileSystem.GetFileInfo("C:zzz-devaccesswhitneywhitney.accdb")
If infoReader.IsReadOnly = True Then
MsgBox("File is readonly!")
End If
I am using the VB 2010 Express DataSource to connect to the MS Access database and not a connection string in the program.
My app has a folder that has some xml documents which is or should be created within the installation Directory. What is the best / most problem free method to access the installation directory: [code]
View 6 RepliesI'm am trying to determine the total number of fields under a particular heading given that the other Heading's total number of fields are > or < than the heading in question. The query, shown first in the attached code, works well if there is one column in one database table, however it does not work well when there are a number of columns with a different number of fields respectively. The CategoriesID encompasses the entire tables contents.I devised a function to determine the total number of fields within a particular column and then attempted to incorporate this, without success, into the second query, shown in the code.
Private Sub GetRandomHeadingFields()
Dim varNumberHigh As Integer
varNumberHigh = TotalNumberofHeadingFields()
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I have recently decided to give .net another chance, but i have a few questions about it before i get really into it. RE: Files, I use random access files to store data as opposed to databases (namely i don't see the need for a database for storing so little information(records <200 max) knowing that it is an older system and less "cool" i don't care...) Will vs2010 express read, write to random access files? Would it be done kind of like vb6 (which is my current vb version)? I will be needing to print the text of rich text boxes, is vs2010 express capable of doing this?
View 7 RepliesI have a situation in which I must execute a dynamically built stored procedure against tables that may, or may not be in the database. The data retrieved is then shunted to a VB.Net backed ASP based report page. By design, if the tables are not present in the database, the relevant data is automatically hidden on the report page. Currently, I'm doing this by checking for the inevitable error, and hiding the div in the catch block. A bit kludgy, but it worked.I can't include the VB code-behind, but the relevant stored procedure is included below.However, a problem with this method was recently brought to my attention when, for no apparent reason, the div was being hidden even though the proper data was available. As it turned out, the user trying to select the table in the dynamic SQL call didn't have the proper select permissions, an easy enough fix once I could track it down.First and foremost - is there a better way to check for a missing table than through catching the error in the VB.Net codebehind? All things considered, I'd rather save the error checking for an actual error. Secondly, is there a preferred method to squirrel out a particular OLE DB error out of the general object caught by the try->catch block other than just checking the actual stack trace string?
SQL Query - The main gist of the code is that, due to the design of the database, I have to determine the name of the actual table being targeted manually. The database records jobs in a single table, but each job also gets its own table for processing data on the items processed in that job, and it's data from those tables I have to retrieve. Absolutely nothing I can do about this setup, unfortunately. [code]
I reproduced the following code to update a database and I get the error" Operation must use a updateable query"
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I am not able to add records in an Access 2007 database using VB 2010 Express Edition. I have read other posts and followed them but still I am not sucessful. I have the connection to the access database as MS Access Database, therefore it has the OLEDB connection (not the Jet 4.0). I am using the project instance in binding the text boxes to the fieldnames in the Access database. Did I miss something? I am also using Windows Vista Ultimate.
Below is the code.
Private
Sub
cmd_Save_Click(ByVal
sender As
[code]....
I am unable to access the TableLayoutPanel feature inside the toolbox in Microsoft Visual Basic Express 2010, I was wondering if this is a feature that is excluded from this package or is it something that I need to download.
View 1 RepliesThe project must have different user and each has username and password will be saved in my database but only the admin can add users.
View 5 RepliesI am trying to write data to a binary file using the Print() method, but when I run it I get the System.IO exception Bad File Mode.
Here's the code for the FileOpen declaration, that might have something to do with it?
FileOpen(filenumber, "path to file", OpenMode.Binary, OpenAccess.Write, OpenShare.LockReadWrite)
Print(filenumber, expression(variable))
I am trying to make a user account SQL database work with Visual Basic 2008 Express for login purposes, i.e. usernames & passwords. Plan is to host this server so people can login to use the the application and verify they have a valid account. I would like to host all the account information in SQL due to the possiblity of hundreds of users at any given time. I also need the ability to add data to the database for users registering for the first time. The SQL server will need to be able to access the SQL Server databases remote via WAN.
View 3 RepliesI'm using Visual Basic/Studio 2010 Express to run my VB program using MS Access database. I'm going to convert the Access database to a SQL Server Server Express data base so I downloaded SQL Server 2008 R2 Express onto my pc with Windows 7. The installation went fine and I actually converted my Access database to SQL server. I did not change anything in my VB program.My problem: When I run my normal program with the Access database (no changes), I now get an error when it executes the following code:
dr = cmd.ExecuteReader.
I get the error System.Data.OleDb.OleDbException was unhandled;
ErrorCode=-2147467259; Message=ODBC--connection to 'SQL ServerBilotta-pcsqlexpress' failed.
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It appears the ODBC is looking for the SQL server eventhough the program is pointing to the MS Access db. How do I get it to NOT look for the SQL db? Is there a default setting for the
I have recently developed a small program which SQL's a MS Access database on a shared folder. I published it to the network folder and many users have installed it fine, but I have had two users who have reported the following error:Could not load file or assembly 'System. EnterpriseServices. Wrapper.dll' or one of its dependencies. The device is not ready. (Exception from HRESULT: 0x80070015)So I went to google and searched on how to get rid of this error and it seems that there are alot of sites to suggest re-installing the .Net 2.0 framework. So i tried to click repair the installation but then hit on another problem:Error 25015. failed to install assembly. 'C:WINDOWSMicrosoft.NetFrameworkSystem.EnterpriseServices.dll because of system error: The device is not ready..So i did more googling and found that it might be due to a HaxDoor virus: url...I am now scanning the system now, but it hasn't picked up any virus yet.What should i do? Is it becuase I am using oledb adapter to access MS access?
View 2 RepliesI have an Access table ("Titles") which is connected to VB.Net using OleDb. The connection variable is conTitles.Some of the column in the table are 'No' and 'Status'.
In the Form, I have a textbox (txtTitleNo) and a button (BtnReserve).I want to put a number in the textbox, and then when I click the button, I want the 'Status' column with the corresponding number to be changed to 'Reserved'.
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Created MyLitsBox project as described in Michael Halvorson's book MS VB 2010 Step by Step book. Tip box on p. 89 says to make programs more robust embed images into application rather than use absolute path names to link images into the application. Searched on Halvorson's recommendation "How to: Create Embedded Resources" and found the info at: [URL]
OK. As usual the most difficult thing is finding the menu item, etc., the instructions direct you to. Do the people who write these instructions ever try using them?
xxxxxxxxxxxxxxx
Instructions are as follows
To edit a resource by using the default editor
With a project selected in Solution Explorer, on the Project menu, click Properties.
Click the Resources tab.
On the Resource Designer toolbar, point to the resource view drop-down, click the arrow, and select the type of resource that you want to edit.
Double-click the resource to open the default editor for that resource type.
In the Properties window, select the Persistence property and change it to Embedded in .resx.
do you Create Database in MS Access Using Oledb in vb.net?
View 4 RepliesIs it possible to drop an MS Access Database using Oledb in VB.Net?
View 2 Repliesi am developing a project on "sigmoid investment solution" where i have a form where i have to enter all the recent BUY/SELL of shares. and after inserting each record i need a BUY AVG and a SELL AVG. i am using oledb connection to connect to a access database. i want to use the following sql command SELECT AVG(Price_field) FROM table_name WHERE buy_sell="BUY"..i want this result to display on a text box in the form. What is the code to connect to data base executing the query and displaying the result in a textbox.
View 1 RepliesI wonder is there another way to connect,edit access database with out using OLEDB command.I want to insert,delete data from access table without using oledb.
View 3 Replies