2008 - Adding A Datarow To A Datatable
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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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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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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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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Jun 7, 2009
I am working in vb2008. Is there a simple way to clone the contents of a datarow in a datatable into a new datarow instance that can be added elsewhere in the table. Can I create a new instance of a datarow and set it equal to an existing datarow?
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Apr 9, 2012
I'm trying to delete the selected row in a gridview from the datatable but it seems like it's not deleting. in if statment Table.Rows.Count = 0 is not working and I'm trying this with one row in the grid view.
Protected Sub GridView1_RowCommand(sender As Object, e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
[Code].....
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Dec 27, 2009
I have a listbox and its source is a DataTable, when i click a button i want to get the selected datarow somehow, maybe the index number of it so i can edit its values etc.
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Nov 5, 2010
In a web applicaion using vb.net as the code behind. I have created a DataSet (hdar) in the designer with a data table and table adapter (AccessRequests). I am trying to add a row to the database table using datatable.add row
[Code]...
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Jun 15, 2010
This is bug in VB 2008
Dim dsExpre as New DataTable
Table has Two Fields (ExprID, Expression)
112,xyz
113,abc
Private Sub..........
Dim rsExpr as DataRow=Nothing
Dim i as Integer
[Code] .....
The Problem is, When i becomes 2, Table Data also becomes "q", Why....?
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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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May 21, 2011
I am trying to add the returned values from an array to the rows in a data table: Here is my current code the values load properly into the list box but not the table, each row ends up with the same value.
current code not working correctly
Dim dtrow As DataRow
Dim lat As Double = CDbl(34.213209)
[Code]....
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Mar 26, 2010
I have created a datatable and now i need to print it,so i did the following:
Private Sub PrintDocument1_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
Dim xPos As Single = 20
[CODE]...
The code works fine.But in the above code as you can see that i am printing the each rows content of the datatable one by one and after printing all the contents of a single row i am looping the code again for printing each and every row present in the datatable. So i want to know that inspite of printing each and every data present in the row of the datatable,is it possible to print the entire datarow at a time and then loop through all the rows present in the datatable?
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May 15, 2012
I have a program that reads a text file and creates a datatable dynamically based on the columns in the file.
This seems to work fine.
I then try to read the rest of the text file, creating a data row to add to my table. I'm using the code below but it's not working for me.
view plaincopy to clipboardprint?
Dim strFieldData As New ArrayList
Dim obj As New Object()
[Code]....
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Feb 3, 2010
I have a session which contains a datatable and also have a function which returns a datatable. I need to add these two. How can I do this? The below code is to be replaced with correct code.
Session("Table")=Session("Table")+obj.GetCustomer() where obj is an object of the business layer.
The '+' sign cannot be used to add these two, so how can I do this?
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Jun 2, 2011
I have a DataTable oDT. oDT is populated from SQL Server with 6 columns including a column "bAAA" of varbinary(200) I have a function fx(ByVal byteArray As Byte()) as String I would like to add a calculated column to oDT something like this:
oDT.Columns.Add("sAAA", GetType(String), fx(bAAA))
'bAAA is not declared
oDT.Columns.Add("sAAA", GetType(String), fx("bAAA".ToArray))
[Code].....
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Jul 15, 2010
i have a problem when add data into dataTable. The problem is that after populating the dataTable with the 1st, and when adding a 2nd column, the row that contain the data is not at 1st row of 2nd column. It is directly under 1st column row. For example, column 1 has 10 rows of data. After adding the 2nd column, the data is at row 11 instead on the 1st row. Can someone tell me how to add the data for 2nd column so that it will be in the 1st row. Code for adding the data
Dim col1 As DataColumn
Dim row1 As DataRow
col1 = New DataColumn("Column 2", System.Type.GetType(" System.String"))
dTable.Columns.Add(col1)
[code]...
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Nov 22, 2010
How do I go about adding a ButtonColumn to a DataTable.
I am basically using a DataTable as the DataSource of a DataGrid and need to add a ButtonColumn to the DataTable so that when I DataBind it to the DataGrid it all works.
Although when I try
dt.Columns.Add(buttonColumn)
This is not allowed. It has to be a basic DataColumn.
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Oct 31, 2010
I am trying to add a datatable to a database. Here's what I've been trying:
Dim newDataTable As DataTable = New DataTable("Example")
VocabularyDataSet.Tables.Add(newDataTable)
SqlDataAdapter1.Fill(VocabularyDataSet.Tables("Example"))
I've tried various incarnations of Fill and Update. But the tables will not save on the database!
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Jul 20, 2010
I have an array which holds the following items
for example
Quote:
myArray(0) = (1)
myArray(1) = (4,2)
myArray(2) = (10,15,20)
[Code]....
and then am trying to add other column based on items available in myArray().
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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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May 17, 2010
I have a function that converts a .csv file to a datatable. One of the columns I am converting is is a field of names that have a comma in them i.e. "Doe, John" when converting the function treats this as 2 seperate fields because of the comma. I need the datatable to hold this as one field Doe, John in the datatable.
Function CSV2DataTable(ByVal filename As String, ByVal sepChar As String) As DataTable
Dim reader As System.IO.StreamReader
Dim table As New DataTable
Dim colAdded As Boolean = False
[Code]...
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Aug 20, 2010
listA is list of integerdtListB is DataTableI'm checking that if StudentId of ListA doesn't exist in dtListB, then add it to the dtListB.
Dim stidListA, stIdListB As Integer
For Each la In listA
stidListA = la.StudentId
[code].....
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Apr 19, 2011
I'm trying to add records from a CSV file into a dataTable in vb.net, as follows:
dim myObjAdapter as new myDataSourceAdapters.myTableAdapter
dim myObjTable as new myDataSource.myTable
myObjTable = myObjAdapter.Getdata
[Code]....
PS: in CSV file, the decimal digit is "." and if I add directly a record into table, using "." as decimal separators, the numbers get right format.
There is a kind of settings to change, or option to enable/disable on adding this records to do the right adding?
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Jun 16, 2010
I'm adding a DateTime DataColumn to a DataTable like this:
Dim colDate As DataColumn = New DataColumn("Date")
colDate.DataType = System.Type.GetType("System.DateTime")
dt.Columns.Add(colDate)
Then when I try to add it to my datatable, if the value is Nothing I get an error saying string was not recognized as a valid DateTime. I'm having trouble getting this to work.
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Feb 28, 2012
I'm populating a datatable with this
Using con As New MySqlConnection(strCon)
'get users direct friends
Dim cmd As MySqlCommand = New MySqlCommand("SELECT distinct f.* FROM friends f WHERE (f.UserID = ?UserID) AND (f.FriendUserID <> ?FriendUserID)", con)
cmd.Parameters.AddWithValue("?UserID", UserID)
[Code]...
now I need to create another command, datatable and datareader in this same function and add the rows of that datatable to the one above. What is the most efficient way of doing this?
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Apr 8, 2011
I have a datagridview that I've added a checkbox column to. When I preview my data without the checkbox it works fine. when I run the program and try to load the datatable, I get a data error. I'm not sure what may be causing this. Where can I look to figure out what's causing this error?
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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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Feb 4, 2010
I have a data table in a loop that adds rows on each loop. During the loop i collect an array of unknown size. At the end of the loop i want to add a new row to the datatable with eachelement of the array as a field.[code]I could hard code this if i knew how many item would be in the array but i dont.Is there any way i can loop through the array and append the value to a row?
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