MS Access Primary Key Keeps Defaulting To 0 Regardless Of The Specified Number In VB?
Apr 29, 2009
I am in the process of creating a system using VB in Microsoft Visual Studio 2008. The system which I am creating is connected to an Access database via a tableadapter.Currently, I am coding a form for a table called Employee and this form allows the user to create a new employee, edit or delete an existing employee. Editing and deleting an existing employee works fine but adding a new employee is causing me trouble. When I specify an employeeID (this is the primary key), the declared value is stored appropriately in memory and it also displays in the form, however once I save the new employee to the database, the employeeID always defaults to 0 for some unknown reason. So, the record which I've just entered has a primary key of 0 regardless of what the the primary key should be.
The employeeID is declared as an integer and the value is obtained by getting the employeeID of the last record in the table and adding 1 onto it. I've also tried hard coding the employeeID and a specific number, but this does not make any diffence. I've reused the code from another part of the system which works fine before, but why it suddenly doesn't work is baffling me. The employeeID field in Access is a long integer.
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Feb 8, 2010
I have a database program, and the first row of the table i'm inserting into is a primary key, just a number that increments by one each row. This is my SQL statement,
SQL = "INSERT INTO Squad VALUES('" & (NUMBER) & "','" & txtfirstname.Text & "','" & txtsurname.Text & "','" & txtdob.Text & "','" & cbxposition.SelectedItem & "','" & lblhiddenid.Text & "')"
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Jan 18, 2010
How would i get the primary key id number from a Table WITHOUT making a second trip to the database in LINQ To SQL?
right now, i submit the data to a table, and make another trip to figure out what id was assigned to the new field (in an auto increment id field). I want to do this in LINQ To SQL and not in Raw SQL (I no longer use Raw SQL).
also, seond part of my question is: i am always careful to know the id of a user thats online because i'd rather call their information in various tables using their id as opposed to using a guid or a username, which are all long strings... i do this because i think that SQL Server doing a numeric compare is much (tentative use of the word 'much') more efficient than doing a username (string) or even a guid (very long string) compare.
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Oct 28, 2008
anyone know how sql pick a random number of primary keys, I know get max number and call a random number work but what if there a missing numbers like 1,2,4,6,7 so max 5 and random will missing 6 and 7 also there a error if 3 and 5 come up.
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Mar 15, 2012
I have a VB.net application that has three project in it. Two of the project are DLL with references in the primary project. I have a public Model "RegSaveGet" in the primary project listed below. When I look for the namespace for the module from one of the DLL projects I can not see it. I want to use this module from the two DLL projects. I can only see it from the primary project.
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Feb 21, 2011
I want to check in an Access Database if a primary key exists using VB.Net & OleDb:
By primary key name
By number of fields as primary keys
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Jan 21, 2009
I'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?
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Jul 21, 2009
i am wondering if it is possible to get the source code for the following:
1. use vb.net code to set on/off primary key when connected to Access database
2. update a particular data.
for e.g: hostname: AES-19 *use source code to check data in Microsoft Access database
if hostname is new, insert into Access. if hostname already exist, update into Access
*so that i will not have duplicate data in Access.
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Mar 2, 2011
MS-Access Database
Table: myTable
Field1: ID (COUNTER, which is autoincrement in Access)
Field2: SURNAME (VARCHAR)
Field3: NAME (VARCHAR)
I want to get ID returned, whenever I insert a row. Is there a way? (I am using VB.Net)
EDIT: Solution using SELECT @@IDENTITY
'Execute insert statement and return identity (autoincrement ID field)
Public Function executeInsertGetIdentity(ByVal insertStatement As String) As Integer
' Execute insert
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Feb 22, 2011
I have noticed that whilst in the past using MS Access you could have a primary key field on a form and have it not visible. You could still use it for Dlookups etc using the value in the field no problem even though it is not visible. In Vb if i hide a textbox that is bound to a PK field in a datasource and try to use its value in code i get an error. Making the field visible again prevents the error. My goal is to use a PK bound textbox not visible to the user but still read its contents.
Also, what is the equivalent of a simple DLOOKUP in VS2010? EG. You have the PK and want to know, say 3 other pieces of information from the record based upon the PK you have.
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May 21, 2011
I have managed to successfully create a logon page and have created a form to insert data into one of my tables using text boxes and a "Save" button, however the first field in the table is the named "CustomerID" and is set to Autonumber, this is the primary key of the table. If I enter a record into the table in Access it automatically enters the next valid ID however when I can't seem to make this happen when entering data via my VB form!
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Mar 15, 2010
What's the syntax for an Update query for a table without a primary key?Disclaimer: Frustratingly, adding a primary key is not an option. My program is a small program in a much larger system with poor data management. My development time does not include rewriting the other software.
Note: The database is Microsoft Access.
Note: Similar to: Excel: TableAdapter UpdateCommand for table without primary key
UPDATE: Am I correct in saying, "If the table in the database has no explicit primary key, then there can be no valid TableAdapter UpdateCommand?"
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Aug 23, 2011
On a client i have an anonymous list containing a multi-column primary key previously selected from the DB.Then i need to select all the records from the DB that equals the primary key list i have stored in the memory.[code]
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Mar 2, 2012
How i can import row from TABLE1 to TABLE2 without primary keyfield or adding correct value to primary key
i tried with two different codes, but result is same, it says: "In the column "Key"a constraint on the uniqueness.[code]...
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Aug 5, 2008
I have an access DB with 3 columns, ID#(Primary Key), Minutes, and Profit/Loss. I'm using the Total feature in access which adds a Row 'Total' to the bottom and shows the sums. How would I get the sum from the 'Minutes' column, 'Total' row, and get that to show in a text box (txt002004Min) ?
Imports System.Data.OleDb
Public Class Form13
Dim cn As OleDbConnection
[code]......
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Aug 3, 2010
When I add a new row to an access database, I would like the primary key to be automatically incremented and entered. I've got this to work using a sql database, but it doesn't work with access for some reason. The following code works if I give the code a value for "@key" which is my primary key column. If I leave it out I get the error "Number of query values and destination fields are not the same". I don't want to have to supply the primary key, I want it to generate automatically.
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In the database the primary key is type "AutoNumber". Does anyone know what I'm doing wrong?
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Apr 9, 2010
when i will enter form no. in the text box this should check the on the lost focus event either this form no. is already exsist or not.if exist show msgbox?
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Mar 29, 2012
I'm currently stuck on an issue regarding declaring an array of type short in a structure and having it default to 'nothing' rather than '0' after ReDim.'Declaring array and setting it's initial size
Private Structure Totals_T
Dim sTot_Desc As String
<VBFixedArray(10)> Dim iTot_Cnt() As Short
Public Sub Initialize()
ReDim iTot_Cnt(10)
End Sub
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When calling m_Totals(0) the arrays returned have 10 records in the arry with sTot_Desc and iTot_Cnt having values of nothing in all records. When I ReDim m_Totals both the variables I declared in the structure(sTot_Desc and iTot_Cnt) are declared as nothing, it's fine for the String but I need the Short I declared to be declared as '0', which is what I thought happens when you ReDim. Can anyone see what's going on here and why it's declaring my variables as 'nothing' rather than defaulting to '0' for the short and ""/nothing for the string?
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Oct 4, 2011
I'm using a NumericUpDown control with a Minimum set to 10 (using for font size setting). When it is changed, it is bound to an Application setting and saved. On Form Load, I am attempting to set the value of the NumericUpDown control to the value stored in that setting (14 for example). No matter what though, it doesn't use the setting's value, it uses the value of the "Minimum" property of the NumericUpDown control.
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Jan 18, 2011
I have been working on something for a week or so, trying to get it to work, but regardless of what I do, it is not doing anything. I have two forms, one called frmWorkLogEntryStart and the other called frmWorkLogEntry.
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Jan 11, 2010
Is there a way to default the Copy Local property of references that I add to my projects? I figure there has to be some sort of method since adding a reference to a VB componentdefaults to False. (for example, start a project as a class library and then adda reference to System.Windows.Forms, it will default Copy Local False.) Is that somethingin the DLL's settings or configuration that I could replicate in my DLLs to force that
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Jan 17, 2011
I am using Access 2010 and VB in VS2010.I have created a DB and have several tables. 1 table in particular called Employers, has the normal AutoNumber Primary key. Everything in Access runs fine. I used Access to develop a basic model application of the full version I am developing in VS.My VB front end contains a dataset linked to the employers table. I have dragged onto my form the "detail" view of this DataSet, not the DataGridView. The usual controls are in place such as the EmployerBindingSource, EmployerTableAdapter, TableAdapterManager and a EmployerBindingSourceBindingNavigator.On my VB form Scrolling through the record set is fine and all works well.My problem is after I click the "Add" record button on the EmployerBindingSourceBindingNavigator. The form fields go blank as expected awaiting user input. However, the field that is bound to the employer_id field (the Employer table's primary key) shows a value of -1.The insert command works no problem, and having looked at the database the table contains the new record with a correctly incremented PK
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Jan 18, 2011
I have been creating a call management application and I am having a problem with something that I have spent weeks on trying to get working and nothing I try is working for me. My application is an MDI application written in VB.NET 2005 Professional, using .NET Framework 2.0. It uses a back end database using Microsoft SQL Server 2005.When the MDI application launches, a form is displayed to the end user asking for phone number (MaskedTextBox) and a partner name. The partner names are within a ComboBox.
When the end user types in the phone number and selects a value from within the ComboBox, s/he clicks on the start button. This then opens a second form. The phone number from the MaskedTextBox is to default in a second MaskedTextBox (this I am able to get working without issue.) The partner name selected from the ComboBox is to default on the second ComboBox. This is the part where I have been working on it for weeks and not able to get it to function.
The second form has many ComboBoxes, all of which pull down items from a particular table within the database. Some of them are editable and some are not. The ones that are editable are also auto complete Suggest/Append on the ListItems.I wrote a sub to handle the population of these ComboBoxes and also to handle if they are editable or not. All of this is working. However, my main issue is that I can't get the value on the second form to default to what ever was selected on the first form. I do not get any errors but regardless of what I do, the second form always stays as the first item in the list regardless.
The code I am using is as follows:
<CLSCompliant(True)> Public Sub PopulateDropDownListFromDB(ByVal cboName As Elegant.Ui.ComboBox, _
ByVal TableName As String, ByVal ColumnName As String, _
ByVal UseAutoComplete As Boolean, _
ByVal UseSQLDistinct As Boolean)
[code]....
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May 15, 2011
I'm using access as my database and vb .net 2008.My problem is i change a field into 2 ecimal places and when i debug my program why my data in the datagridview not a 2 decimalExample : in access TotalCost = 200.00in vb form datagridview TotalCost = 200
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Mar 20, 2012
I'm having a problem setting the maximum number of records that can be saved into Access. The maximum allowance is to be 10. Records are being pulled from a listbox. The whole problem is that if the listbox has 7 items and my table already has 5 records, it still records them, making a total of 12. What I'm looking for is a way to trap that to a max of 10.[code]...
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Aug 10, 2009
I have a variable called VarNUM which stores a number from 1 to 10. What i want to do with this is based on the current number stored in that variable call a different set of variables from a module with Public Structure ITEM1. It has the same set of variables for ITEM1 - ITEM10 but with different values. So ya in raps how can i use the number in one variable to access a set of different variables? Something like ITEM(VarNUM) then the set of variables that all have same name but with different values so that i dont have to go,
Code:
if VarNUM = "1" then
name = ITEM1.name
store = ITEM1.store
[code]....
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Jun 21, 2010
Like below quotes for serial no. for VB.net, do you have codes for ms access? [code]
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Sep 28, 2010
I used this code to assign the primarykey from my MS Access database to my DataSet in my project:
Dim col(1) As DataColumn
col(0) = ds.Tables("Filmer").Columns(0)
ds.Tables("Filmer").PrimaryKey = col
[code].....
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Nov 30, 2011
I have an access database that I am writing a SQL query to insert data from my datagrid into a table that I created.I get an error that I have tracked down to field types that I have created as a DOUBLE. Here is my SQL Query for creating the table -
[code]
("CREATE TABLE [SSR Shts_" & FullName & "]([ID] AUTOINCREMENT,[Division] Text(255),[Bid Reference] Text(255)," & _
[code].....
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Oct 10, 2010
i try to update the table but not sucessful. In access database the following fields with datatype as under;
Parameters=text
Value=Number
Units=text
[code].....
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