VS 2008 - Cannot Add New DataRow To Access DB
Mar 17, 2011
I am developing a VB.net application with an Access database. I have the database connected fine to allow me edit existing customers and update the dataset and the database. However when I try to add a new customer to the database - i.e a new row it causes and error when I try to update the database. The error is
"Syntax error in INSERT INTO statement."
This is my code:
Imports System.Data
Imports System.Data.OleDb
Module Module1
Friend objConnection As New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source = ordersystem.accdb")
[Code] .....
I think it is just a small thing which is causing this error. I have spent hours going through another example that works perfectly and I cannot find any discrepancies!
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Mar 9, 2010
my code is
Dim rows() As Data.DataRow
rows = DataSet1.Tables(0).Select("unitname='Ltr'")
dim i as integer
for i = 0 to rows.count -1
MsgBox(rows(i).item(0)) '' HERE ERROR ITEM PROPERTY NOT FOUND
next
so i want a specific item in rows like this code we use in dataset...DSet.Tables(0).Rows(1).Item(1)
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Nov 4, 2009
See the code below which is triggered on a datagridview row validation event where the datagridview datasource is a datatable.
The messagebox shows that it loops around as expected populating the datarow with the expected values (NOTE: There are no primary keys as this is a college assignment with specific requirement and all fields can be nullable).
I had to use ImportRows as AddRows would always error due to "This row belongs to another table" the odd thing was the values were different and again the table contains no primary keys.
The code below runs but never adds a datarow to the dataset datatable "Bookings", does anyone know what the problem might be?
CODE:
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Oct 13, 2010
I have a table in an SQL database bound to a datagridview and am having an issue with understanding what happens when I add a new data row.
My datatable is built in code with the first column created using this sql command...
vb
cmdString = String.Format("CREATE TABLE {0} ({1} INT IDENTITY(1,1) NOT NULL, ", tableName, columnNames(0))
after that there a a number of other columns added to the command to build the table. After the table is created, I fill the datatable and bind the datagridview using this code....
vb
Dim cmdString As String = String.Format("SELECT * FROM {0}", DB_DATALOG_TABLE_NAME)
DataLogAdapter = New SqlDataAdapter(cmdString, dBConnection)
DataLogTable = New DataTable
[Code].....
This is where my understanding is falling. Because I have created the datatable's first column with the NOT NULL key word, an exception throws when I try to update the data adapter because the first column of the data row is empty By creating the table with the first column the IDENTITY key word, doesn't that imply that the database will generate the value for that column? If so, when I add a new datarow, how does the identity column get filled?
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Apr 5, 2010
I am trying to save a row to a variable so that I can remove it from the DataTable and then add it at a different index. thing is, the row that is added is empty of the information from the data row. I'm thinking the DataRow is not saving to the variable properly. Here's my
Dim row As DataRow = dtFolderList.Rows(MoveIndex)
I'm 99.99% positive I found out how to do this like last week or soemthing but can't for the life of me remember where I found it or how to do it.
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Jun 26, 2009
What is wrong with this code. It does not update the access database and no error.
Dim conn As New OleDbConnection
Dim sqlQRY As String = "SELECT * FROM StdMaster WHERE StuNo = " & txtStudentNo.Text & " ORDER BY StuNo"
[CODE]...
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Apr 28, 2010
I have two datatables with similar structures that I want to make one existing row to be updated from another datatable.
For example, "tableA" has three columns: "one", "two", and "three"; with "one" being the primary key...
and "tableB" has three columns as well: "one", "two", and "three"; with "one" being the primary key.
Say there is a row on tableA that is different than a row on tableB (with a matching primary key). What I wanted to do, as efficiently as possible, is to take the that row from tableB and replace the one on tableA so it'll be modified.
I'm not sure if there's an easier way of doing that instead of using loops for setting the row's items.
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Jan 14, 2009
im dr As DataRow = CType(Me.ProductBindingSource.Current, DataRowView).Rowbut I get the error saying:
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Aug 31, 2009
Is there a way to convert a DataGridViewRow object to a DataRow object?
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Feb 28, 2010
I have a datatable with 2 columns named TimeStamp and value. After I populate the table with rows, I am using the table's compute method to get the max value like this....
MyTable.Compute("MAX(value)", Nothing)
Is there is a way to get the row (or more specifically the TimeStamp value) where the max was found?
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Apr 12, 2011
I have a basic Table and I can add and save data, but when I try to delete, I het this error:
[Code]....
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Mar 15, 2009
I have finally been dragged kicking and screaming into the 21st Century and I'm learning VB.NET
[Code]....
I get a "Syntax error in INSERT INTO statement" on the da.update line. The bulk of the code is copied from a working section of the program, I have just added the "newrow" stuff. I am pretty confident I have the names of all the fields correct.
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Jun 29, 2010
I am trying to look at the next datarow in a datatable such as For Each dr in dt.rows
type = dr("Type")
type2 = dr("Type")
how can this be the next record? Of course, I would need to write an exception for the last record...
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Mar 16, 2011
I have a form with a datetimepicker. On load of the form, I set the value of the dtp from a datarow, with the following vb.net dtpRequiredDate.Value = dr.Item("RequiredDate")
This works fine. But when the form is loaded subsequent times in the session (form is not disposed on closing, shown as dialog), when presented to the user it just shows todays date, not that set by the above code. Stepping through code, the Onload code runs, and the dtp is set by the above code. Checking the value in debug at this point, the value of the dtp is correct. There is no further code in onload. But by the time it is displayed to the user shows todays date again. I have set a break point on the valuechanged of the dtp but it never fires again after it has been set by the above code.
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Oct 4, 2011
Can anyone explain exactly why Method 1 in the following code does not alter the DataTable where the other 2 methods do? It's obviously some kind of referencing issue, but why exactly?
[Code]...
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Mar 14, 2011
I am trying to add new operators (their name, category, password etc) to a dataset called "operators". (Though I could be adding any new datarow to it's relevent dataset). My program has allowed for the entry of all relevent data and filtered it to make sure it is acceptable. The user has pressed the UPDATE button and my program must now add the new datarow. (My code is in bold!).
I assume that I must first establish a connection to my database, so I start with :-
Dim Conn As New OleDbConnection(ConnectionString)
'I feel that something is needed here to reference OleDbDataAdapter - but what?
Conn.Open() 'Is this line needed?
Dim DSetOPERATORS As New DataSet("operators")
Dim DRowOPERATORS As DataRow = DSetOperators.Tables("operators").NewRow
[Code]....
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Sep 8, 2009
I am trying to get data out of a DataRow. Example:
Dim dr_simslot = dsFSC.tblSimSlot.Select("SimID=" & simID)
What I want is to say something like this:
Dim temp = dr_simslot.columnname
This is because I know only one record will be in the datarow.
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Mar 31, 2012
for each row as datarow in dt.rows
if row is last row in dt
msgbox("last row in datatable")
end if
next
how do i detect the last or first the row is in datatable
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Apr 19, 2012
I have a master DataTable that may contain some DataRow.RowError. I create multiple subset DataTables from my master DataTable using the DataView.ToTable method whenever the user wants to apply a filter or sort to the master table. However, the ToTable method does not transfer the RowError property of the data rows in the master table to my new subset table. So in order for me to transfer the row errors from my master table to my subset table I have to use a loop. The code below works fine, but with one exception (see below code).
Dim dtMaster As DataTable = Me.ds.Tables("Current")
Dim dtSubset As DataTable
Dim dv As DataView
[Code]....
Note, the primary key may contain 2 columns, however this is a rear case. If you know of any other solutions to transfer row errors let me know. I don't have to use the Find method.
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Oct 5, 2010
Code is in VB 2008,
In code i am using Datatable, using that select method datarow
Dim dt as New Datatable
Dim dr() as Datarow = nothing
[code].....
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Aug 9, 2009
Public Class frmVisitor
Private dbConnection As New OleDb.OleDbConnection()
'To add a DataAdapter
[Code]....
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Jun 10, 2011
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim ds As New DataSet
[code].....
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Aug 2, 2010
I'm using a LINQ query to translate data inside a DataTable object to be a simple IEnumerable of a custom POCO object.
My LINQ query is:
Dim dtMessages As DataTable
'...dtMessages is instantiated ByRef in a helper data access routine... '
Dim qry = From dr As DataRow In dtMessages.Rows
[code]....
However, the compiler is throwing a warning message under dr As DataRow with the message: Option Strict On disallows implicit conversions from 'Object' to 'System.Data.DataRow'.Why am I getting this error and what do I need to do to fix it? I would have thought that dtMessages.Rows returned a collection of type DataRow. Is this not correct?
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Jul 23, 2010
Private Function ColumnEqual(ByVal A As Object, ByVal B As Object) As Boolean
[Code]...
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Mar 15, 2012
I've VB.NET function that reads data from an Excel sheet and adds rows in a Datatable.
Private Function LoadDataToRows(ByVal TableName As DataTable, ByVal Header As System.Collections.Specialized.StringCollection) As Boolean
Dim HeaderDataExcel As String = String.Empty 'Data Header
[Code].....
But no data was add to the table, only emty rows.
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Mar 15, 2012
I've VB.NET function that reads data from an Excel sheet and adds rows in a Datatable.
Private Function LoadDataToRows(ByVal TableName As DataTable, ByVal Header As System.Collections.Specialized.StringCollection) As Boolean
Dim HeaderDataExcel As String = String.Empty 'Data Header
[Code].....
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Dec 16, 2010
I have the following code where I'm trying to bind a datarow to a textbox.
Me.TierNameText.DataBindings.Add("Text", Me.m_TierRecord, "tier_name") Problem is, when the form is displayed no text is shown in the textbox.
This code runs before I call the form's ShowDialog method. I stepped through the code to make sure the datarow has data, and indeed it does.
I rarely use databinding but thought I'd try it this time.
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Sep 17, 2009
setting a DataRowView equal to my DataGridViewRow.DataBoundItem, then using the DataRowView.Row property (In my code below).
Here's my code:
Dim tblTemp As New DataTable()
Dim row As Windows.Forms.DataGridViewRow
Dim rowView As DataRowView
[code]....
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Aug 1, 2011
I have dataset like
<DATASET>
<SALES_DO_INDEPENDENT>
<SALES_DO_INDEPENDENT_ID>22</SALES_DO_INDEPENDENT_ID>
[Code]......
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Mar 22, 2010
I have a DataGridView that is bound to a DataTable thru the code. I want to be able to modify the data when a row is selected from the Grid. How do I reference that row of data from the grid so I can convert it into the DataTable row to be updated? I'm trying to do something like this:
Dim row as DataGridViewRow = DirectCast(dgvAddress.CurrentRow, DataRow)
This isn't working. I'm getting an error basically stating that I can't convert a DataGridViewRow into a System.Data.DataRow.
[code].....
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