VS 2005 Compare A Column Present In The Access Database Using The ExecuteScalar()
Aug 16, 2009i 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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Compare Two Access Databases With Two Fields Each And Write The Results To A Third Access Database?
Apr 22, 2010I am using the code shown below to compare two Access databases with two fields each and write the results to a third Access database. I am getting an error at the "Do While DMReader02.Read = True" line: "Invalid attempt to call Read when reader is closed." Why would the reader be closed at this point if I am using different DataReaders in the two loops?
Imports System.Data.OleDb
Partial
Class Form1
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VB 2010 Express ExecuteScalar Method OleDb (MS Access)?
Sep 19, 2011How 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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Database - Implement A Login System Using LINQ To Compare Information With An Access Table?
Sep 27, 2011I have been requested to implement a login form into a friend's Visual Basic .NET application. He specifically requested that I should do this using LINQ to compare the input to a table in an Access database. I don't really know why he imposed these restrictions, but who am I to judge? However, the problem is I am not overly familiar with VB .NET, or LINQ.
View 1 Replies2005 - Login With Database - Only Get Latest Data On Username And Password Column On My Database
Jan 14, 2011I have code on log in form but it only get the latest data on username and password column on my database
Here is my code
Public Class Users
Dim MyLogIn As New myRecords
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
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This is my connection:
Imports MySql.Data
Imports MySql.Data.MySqlClient
Module myconnect
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This is my record:
Imports System
Imports System.Data
Imports MySql.Data
Imports MySql.Data.MySqlClient
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Database Sql Server Compact Edition 2005 - Save In A Database - Column Cannot Contain Null Values
Oct 15, 2009Ive created one database Sql Server Compact Edition 2005, with one table ("Cliente") I know that I can created my database good, but i have a problem saving information since three textbox, in my table(With columns "Nombre" "Apellido" "Cliente". In my form there is a button save ("Guardar"). When I do click in my button appear the next message : "The column cannot contain null values. [ Column name = Nombre,Table name = Cliente ] " and happen the same with apellido and Id_Cliente. And this happen becouse my code cant save the information....
This is the code
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Imports System.Data
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And the code for my button is:
Private Sub cmdguardar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdguardar.Click
Dim myconnection As SqlCeConnection
Dim mycommand As SqlCeCommand
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Compare "." With Integers Already Present In A Label?
Jul 7, 2011I want to compare "." with integers already present in a label.e.g 123.45 if user wants to add another "." check if it's already present in 123.45 then don't add.any function for this in VS?
View 8 RepliesVS 2005 Add A Column To Database
Sep 1, 2010I am using the following code to add a row to an exisitng databse and now I am trying to add a column, the code executes ok with no error messages and the column is being added to the datatable, but it does not appear to be added to the database can anyone see what I am doing wrong?
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Export A Table From An Access Database To Another Access Db Using VB 2005
Mar 31, 2009I have two Access database, say database One.mdb and Two.mdb. I want to use VB2005 to export tblCustomer from One.mdb to Two.mdb, and replace the existing tblCustomer in Two.mdb, during run time. I basically want to simulate the export function that is available in MS Access (which can export one table from one Access database to another) with VB2005 during run time. I can think of a way by querying the table to a dataset and then delete everything on the other database before filling the table in that database with the dataset. However, there should be something simpler and faster than that, shouldn't it? Any idea?
View 6 RepliesAdding A Column To An Access Database?
Jun 29, 2010My program has an access database with a table called "Contacts". This table stores many values. I have a seperate table that stores surveys. Each contact should have a column for every survey, indicating whether or not the survey has been completed. However, this means I need to add columns to the database while the program is running. I tried the following code, which runs WITHOUT errors, but does not seem to actually add the column.
contactsDataAdapter = New OleDb.OleDbDataAdapter("SELECT * FROM Contacts", frmAdmin.con)
contactsCommandBuilder = New OleDb.OleDbCommandBuilder(contactsDataAdapter)
dtContacts.Clear()
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Primary Key Column Value In MS Access Database
Jan 21, 2009I'm using vb2005express for forms (front-end) and ms access database. I have a form with a master-detail setup. The problem I'm having is that when I set the primary key column to autonumber, I don't get the pk value generated in ms access database into my master datatable in forms when a new record is created. Then I tried setting the AutoIncreament to True in the pk column of the datatable in my dataset (forms). This generates a number in my pk column but its not the number generated in the database (since I think because the pk column is still set to AutoNumber). So I change the field property of my pk to Number in the access database and on my dataset (forms), i still have AutoIncrement to True.
This works okay since what it seems to be doing is getting the max value for the pk column when the datatable is filled upon form load. The problem now is that I normally don't do tableadapter.fill(datatable) at form load since I think there would be a performance issue if record counts around millions. What happens now is that when I create a new record, the pk generated is still 1 which will cause duplicate violation when saving to database. I'm not quite familiar with access features but in oracle, what I do is I create a sequence in database then I create a function that gets the next value of the sequence. Then at form load I set the datatable.column.default_value = get_sequence. How do I do this in ms access?
VS 2005 Call A Method Present In A Dll?
Apr 13, 2010just created a classlibrary project named CreatingDll and i did this
Public Class Class1
Public Function getComboTable() As DataTable
Dim dt As New DataTable
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How To Compare Date From Access Database With Date In Texbox
Mar 26, 2012my sql statement is returning null when when I compare date from access database and date entered in textbox in vb. seems to me that the two dates are of different format so null is returned from the select statement but how do I go about this.[code]
View 3 RepliesAdd A New Field (column) To An Access Database Table?
Oct 21, 2011I need to add a new field to an Access database table, the user has filled the table with data, so I have to add the new field but to preserve the old data.
I have found the ALTER TABLE statement, but it gives me an error (ALTER TABLE is not a valid statement)
I done this in php+mysql with "ALTER TABLE People ADD Address TEXT NULL AFTER Name" (as an example)
How can do this in VB2010?
Column Alias In Access Query Database
Jan 9, 2012I am using a query in vb.net, database is Access. I need alias of query like sql but the query return me column alias and also ' '
SELECT COLUMN1 AS 'FIRST NAME'
I expect the result to be a field called FIRST NAME but it returns the string "FIRST NAME". Is there is any way if return me the field FIRST NAME instead of "FIRST NAME".
DB/Reporting :: Get Column Type From Access Database?
Sep 29, 2008How can I get information what data type a certain column is. (Integer, string, memo,...)
View 1 RepliesUpdate An Access Database With A Column Which Is An Expression?
Aug 8, 2009I have an access database with several tables. in one of the tables there are three columns named quantity, price and total cost.total cost is an expression of (quantity * price). the expression looks grate in the datagrid etc but when I need to save it to the database
View 1 RepliesVS 2005 Iterating Through The Data Present In A DataTable?
Dec 26, 2009I did this code to iterate through the data present in the DataTable:
Imports System.Data.OleDb
Public Class Form1
Dim con As New OleDbConnection
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But this code always gives the last value of a particular row as its output.
I want to specify a particular column and a particular row of the DataTable and fetch the corresponding result:How to do this?
Link TextBox's AutoCompleteSource To A Access Database Column?
Nov 5, 2009I am using a textbox's AutoCompleteSource I would like to link a column of a Access database. Is there a reference to it.
View 20 RepliesPopulate A Listbox Collection From An Access Database Column?
Oct 24, 2010I would like to populat the Listbox collection from a column from a Access database I already created the name of the collection as collections. I can autocomplete/Suggest a Textbox with no issues.[code]
View 2 RepliesRetrieve All Entries From One Column Of Access Database Table
May 25, 2010I'm looking to retrieve all the entries from one column of an access database table and copy to an array. this array i will then be randomly selecting values from it to create foootball fixtures. I'm confident of being able to achieve the random side of it but i'm struggling to get the records into the array.
View 12 RepliesReturn A Total Of A Column In An Access Database Using SELECT Sum()?
Apr 15, 2010I don't know if this is the best way to do it or not but here goes.I have an access database and a datagridview and they link via a SELECT statement at runtime.I want to total one column named LNLMTS and display the result.I am looking at using SELECT Sum LNLMTS FROM tblProduction WHERE SO=@so AND DATE=@date
View 8 RepliesVS 2005 Creating A .txt File In A Folder Present In A Specified Location?
Sep 3, 2009The user will enter a folder name in the combobox1 and clicking the create folder button the folder will be created in the applications bin folder; For doing this, i did this
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If ComboBox1.Text = "" Then
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Now when the user enters a file name in the combobox2 and clicks the save button(Save button is not shown in the snapshot) then a .txt file with the name entered by the user in the combobox2 will be created in the folder whose name is specified in the combobox1.
VS 2005 Invalid Attempt To Read When No Data Is Present
Dec 21, 2010i am using visual studio 2005 check my code and let me know what i am doing wrong
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VS 2005 Invalid Attempt To Read When No Data Is Present?
Dec 27, 2010Can you maybe tell me what is wrong with this code?I get an error on the line were the writing is in red.
db.OpenConnection()
strSQL = "SELECT * FROM ChaletBookings WHERE BookingNo = '" & strBookingNo & "'"
dr = db.getData(strSQL)
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Connect To An Access Database And Fill A Combox With Data Of A Column?
Dec 25, 2009how i can connect to an access database and fill a combox with data of a column?
View 1 RepliesSearching A Database To See If Value Is Already Present?
Feb 8, 2012I am in the process of creating a program that is linked to a database. I want to automatically generate a reference number that is not already present in this database, to do this i know i am going to need to search the database to check whether that number is already present or not. But I am unsure of the best way to go about this. I am using an access database and vb.net.
View 8 RepliesAlter A Column In An Access Database From Date To Text Format Using SQL String
Oct 21, 2009I am trying to alter a column in an Access database in VB2008 from date to text format using the SQL string as follows "ALTER TABLE receipts ALTER COLUMN Date CHAR(10)"but whether I Use TEXT, CHAR, VARCHAR or STRING, I get a Syntax Error when I run ExecuteNonQuery.
View 2 RepliesIDE :: Set Auto-complete For A Textbox Using Data From A Column In A Table An Access Database?
Aug 13, 2009I am trying to set autocomplete for a textbox using data from a column in a table an Access database. Some of those records in the table have no values. I have set the AutoComplete Mode property to SuggestAppend and the AutoCompleteSource property to CustomSource. When I run the application nothing happens when I type into the textbox. The dataset is called DatabaseDataSet and the table name in the database is called Simple and the specific field/colum is called SIM_TAG1
'Create customsource for tag textboxes to suggest tag terms based on what is in database
Dim oTag As New AutoCompleteStringCollection()
For Each term As DatabaseDataSet.SIMPLERow In Me.DatabaseDataSet.SIMPLE
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Input A String Into A Access Database Under A Column That Was Originally Setup For Numbers?
Dec 8, 2011I'm trying to add a string to a access database, for a column that was originally designed for numbers, i have changed the data type under the design view from number to text, yet I still get a error saying that it cannot convert the string expected int32
Input string was not in a correct format.Couldn't store in Parent_ID Column. Expected type is Int32.This is the full exception, i would have put it into code display but the option wasn't there
System.ArgumentException was unhandled
Message=Input string was not in a correct format.Couldn't store <A-238> in Parent_ID Column. Expected type is Int32.
Source=System.Data
StackTrace:
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