Add Datatables Via Openfiledialog?
Nov 11, 2011I'm trying to the contents of a datatable to a datatable thats allready in my form using the openfiledialog.[code]...
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Datatables Left Join Linq - Joining 2 Datatables And Have The Joined Datatable As Result
Jun 1, 2012I'm having a hard time joining 2 datatables and have the joined datatable as result. First datatable (labels) holds data including a printerid. Second datatable (printers) holds printer references (id > unc). I would like to have as endresult (joined) a datatable with all data from the first datatable with the field (unc) of the second datatable. [Code]
View 3 RepliesVS 2008 OpenFileDialog - Make The OpenFileDialog Filter To Where Only All The .doc Files That Start With "1234567" Show Up?
Jan 4, 2011I have files that start with unique numbers and are word documents. Say the document starts with "1234567" is there a way to make the OpenFileDialog filter to where only all the .doc files that start with "1234567" show up?
View 2 RepliesBest Way To Merge Datatables?
Apr 12, 2010I'm trying to create a program that will merge two data tables (one from a database on a network drive, the other is found in a database on the local machine). Each datatable is identical in structure, only (maybe) differs in content. The structure has a primary key, dateCreated, and dateLastEdited fields (plus other fields). I would like to merge down from the network to the local database. If the primary key does not exist on the local db but does on the network, copy from the network db to the local table. If it does exist, check the dateLastEdited column and copy the latest row to the local table.
How would i set up the code to do this? Any assistance would be great.
How To Intersect Two DataTables
Jan 23, 2012How to intersect two dataTables in vb.net 2.0? I want to get common rows in two datatables and add it in third datatable.
View 1 RepliesHow To Merge Two Datatables
May 20, 2012I need to marge two datatables with condition. I have a datatable where the data comes from a local XML Database and another datatable where the data comes from a remote SQL Server. If any update made in the remote datatable I need to update/merge with the local datatable. Here is what I have so far:
Public Sub MargeTwoTable()
Dim SQL As String = ""
Dim RemoteTable As New DataTable
Dim LocalTable As DataTable
[code]....
In this code data comes from the remote database which updates a date getter then the local database . Both tables have "ID" as the primary key. The code is working well, but the problem is that when more than 1000 records are updated this function takes too long using loops.
Join Two Datatables Into One?
May 28, 2012I have two datatables which I intends to bind them to Gridview. But I need bit of the first dt and bit from second dt.
Second table has only one row that represents to every row in the same column in first table.
There is no primary key or relationship between two tables though.
For example,
I tried datatable.merge though. Didn't produce the last table i want.
Merging Two DataTables?
Jun 7, 2012I have a Main Table that contains all the distinct values in a DataTable.DataColumn. also have a Child Table that contains distinct values created by the user.I want to merge the Child Table DataRows that match on the Value column with theMain Table DataRows to create the New Table (shown below).I want to preserve the values in the Selected column of the Child Table.Here is my problem, if I use the DataTable.Merge method the DataRow that contains "888" in the Child Table is added to the New Table, but it doesn't contain a RowState = Added, thus I can't filter for added rows to remove them.
View 4 RepliesOne DataGridView Two Datatables
Jun 10, 2010I am using VB Express 2008 and SQL Server Express 2008.I have one DataGridView on a Windows Form, which I am attempting to populate from two datatables. Both tables are identical in structure, but with data from two different dates. The respective SELECT statements are identical, except for the date; one calls for yesterday, one for today. I need a seperate Sum column from each table.I've tried to JOIN, UNION, and MERGE the tables, but that gives me all the data consecutively and I saw no way to seperate the days. I'm able to add DataColumns, and sum the fields with an expression, but is it possible to create DGV columns and bind them to the seperate DataTable columns? [code]
View 6 RepliesQuery Two Datatables In .net?
Mar 19, 2012I am stuck with an issue.I have two datatables, with the same table structure, i need to select data from table1 such that the records arent existing in table2is it possible to do this in vb.net? if yes then how?
Table1(AAno,Agencyname,location)
Table2(AAno,Agencyname,location)
Criteria:Select AAno,Agencyname,location from table1,table2 where table1.AAno<>table2.AAno
SQL Statement With DataTables
Oct 12, 2011I'm stumped trying to do an equivalent SQL statement in VB 2010 working with two DataTables, & am hoping someone could point me in the right dirction.I currently have two data tables with three fields each :- A, B, C. The data in field A is the same in both tables & could be used to join the two tables.How could I input data into a third data table having data from both primary tables ? Something along the lines of the following SQL code.[code]
View 3 RepliesUsing Checkboxes In Datatables?
Jan 18, 2012I have a datatable with a yes/no checkbox in it and when I filter my datasource it loads form2. Right now I'm using this code to have a label's color as green if it's checked and red if it isn't:
Private Sub Customers2BindingSource_CurrentChanged(sender As Object, e As System.EventArgs) Handles Customers2BindingSource.CurrentChanged
If ActiveCheckBox.Checked = True Then
Label1.Text = "Active"
[code].....
That works when I do something like bindingsource.movenext because it's in the bindingsource_currentchanged event, but when I try adding that to the form_load it's automatically set to Inactive, color red. I figured it's because is set to checked = false, but what event do I use to make this work when the form loads?
What's the value of a checked checkbox for the update/delete/insert commands? Like dates are DateDateTimePicker.Value.Date. Is it something like this?
.AddWithValue("@Active", ActiveCheckBox.Checked)
I don't use checkboxes to often.
Combining DataTables Using Linq
Apr 27, 2012I've seen several posts on the subject, but none seem to answer this particular dilemma. I have two datatables that I obtained by querying two separate servers.[code]
View 7 RepliesComparison Syntax Between Two Datatables?
Mar 23, 2009I am trying to compare two datatables and generate a resultant datatable of rows that do not match based on customer number. The main table "Customers" contains all customers that have been placed in our system. I am trying to generate a table of customers, "dtResults," that we have not ever generated an invoice from a table called "CurrentCust".I would like someone to look at the attached code and see how I can handle the 'InvalidCastException was unhandled', 'Unable to cast object of type 'System.String' to type 'CustomerDataTable' error. Error occurs at line 43.
1
Option Explicit On
2
Option Strict Off
[code]....
Copy/Mege Of DataTables?
Jun 11, 2012using VB.net 2010 using DataAdapter and DataTables I'm trying to merge two datatables together and update a database with the results if I use the following code it works (though not ideal):
For Each tRow As DataRow In excelDt.Rows
accessDt.Rows.Add(tRow.Item(0))
Next
however if I use the following I don't get a error, it just doesn't update:
accessDt.Merge(excelDt)
accessDt.AcceptChanges()
For ease here I named the DataTables to describe where they are coming from. accessDt is a empty DataTable (to start) from a Temp Access database table with 1 or more columns in it and excelDt is a DataTable created from a Excel Worksheet with the same columns (same order as well) as the Access Table. Basically just trying to get the data from Excel into Access. They are using the same update command just swapping out which method is commented out. I have checked and accessDt does have the data in it before the Update is called using both methods.
Create Program Datatables From SQL TVP?
Jun 28, 2010I am in the process of revising code to use TVP to send data from our VB.NET app to the SQL 2008 DB and try to keep all the writes atomic.[url]...
I am in the process of creating all the in-code datatables to be sent to the SQL stored procedure
However, I will have to create these datatables and datacolumns (then add the columns to the tables) repeatedly for multiple tables.
Data Transfer Between DataTables ?
Jun 14, 2011I have a sequence that reads the selected Excel-file and displays the first row of the columns in the Excel. (The first Excel row has the column names)
Dim cmd As OleDbCommand = New OleDbCommand("select * from [" & tableName & "$]", MyConnection)
Dim dr As System.Data.IDataReader
Dim dt As New System.Data.DataTable
dr = cmd.ExecuteReader
dt.Load(dr)
With the above code I can read the the first rows of the Excel table and choose the names of the columns I like to keep. (By populating the first row to my ComboBoxes)
So, at the moment my DataTable dt has all the table header names but on the first row. And as the header names it has F1, F2, F3, ... F13.
How can I make my new DataTable dt2 take the first row of dt and make it the column names row? How can I choose which columns do I want to transfer from dt to dt2 ???
I have tried the following (Doesn't work):
Dim dt2 As System.Data.DataTable
dt2 = dt.Copy.Columns("F1", "F2", "F3", "F4")
DataGridView1.DataSource = dt2
Datatables And Screen Painting?
Dec 2, 2010Their system executes a DB query everytime they select something, causing performance issues. So I thought that I would read the superset of data into a datatable, and then whenever they want subsets, simply run against the datatable. I've done some testing and the performance difference is HUGE.The problem is how the screen paints on postbacks. The screen will temporarily go blank then the data will appear as expected. Of course, they don't want the blanking of the screen each time they select a subset of data.
I am currently using a repeater to handle the display of data due to the nature of what they want to display. A datagrid might be a good alternative for sorting functions, but I think it would still blank the screen when it data binds.How do I go about filling the repeater without blanking the screen? Is it even p[ossible? Logically I would think not but I don't have the experience. Or perhaps I can fill a datagrid without blanking the screen on the postback?I'd rather not have to go out to the database every time, but if that's the way to go then I can live with that.
Datatables And Xml Reading - Fail
Jan 7, 2010I am working on a mdi project and I have a few different xml files that I need to read in and I would really like to use multiple datatables, but only one dataset. I have always struggled to get a datatable.readxml(filename) call to work without an invalidoperationexception b/c of the schema stuff. I don't understand it very well and in the past my workaround was just to make another dataset. I am trying to avoid doing that from now on. I have written a routine called readxml which will take a xml file name, xml schema file name, and a datatable name and return to you a populated datatable..but I can't get it to work.
Here is my call to the read xml method (comes from my main mdi form class during form load)
Dim dt As DataTable = globals.xml.readxml("SqlConnectionString.xml", "SqlConnectionString.xsd", "sqlConnection")
Here is my readxml routine, I will post two versions of what I tried attempt #1: use a string of raw xml and a xmlreader
[CODE]...
Filter Datatables In Memory?
May 4, 2011I just discovered that ODBC and OLEDB drivers I need to use do not support Access nested queryDefs. The database I was given is full of many layers of nested queryDefs. Is there any way I can build the tables in memory from simple query defs and then use those tables in subsequent querys?
View 8 RepliesJoin Two Datatables From Different Datasets?
Mar 10, 2010How To Join Two Datatables From Different Datasets (With One Commn Column) ???
View 2 RepliesMerging DataTables With Different Columns?
Jun 22, 2010I have an access 2007 Database where I store several different "Jobs" such as repair job, data recovery job etc.
At the min I have a form where the user can view a customer's related jobs either by type, or all jobs related to the customer. I'm trying to do this by adding each job type to it's own DataTable, then merging the DataTables into one.
Private Sub rdoShowAllJobs_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles rdoShowAllJobs.CheckedChanged
'####################### Procedure Level Constants and Variables ###########################
' Dim dtDataRecoveryJobs As New DataTable
[Code]....
What I want is for the first column, ID, to contain the primary key from each table, but when the code runs it adds each primary key column from the tables to the end of the AllJobs DataTable! Am I trying to do something impossible here or is there a way around this?
Querying From Multiple Datatables?
Nov 25, 2010I am trying to create a stock scanner which allows users to filter stocks based on multiple criteria that they select. Like the following example with 2 criteria:
Criteria 1 Filtered Result: StockA, StockB, StockC, StockD
Criteria 2 Filtered Result: Stock B, Stock C, StockE, StockF
SCANNER RESULT: Stock B, StockC (ideally this result would be displayed in a GridView)
[code]......
Reset One Of The Datatables Within Dataset
Jul 20, 2011I've added a column to one of the tables in the database. Is there a quick to reset one of the datatables within my dataset so that I do not have to delete the whole datatable and add it back in?
View 3 RepliesSearch Multiple Datatables For A Value?
Jun 3, 2011Every table I have has an 'UpdatedBy' field which lists the user who last made an update to the record. I need a way of searching every datatable for that username and returning the count of the rows where the LastUpdated field is equal to a parameterized username. How can this be accomplished without writing a seperate query for each datatable that does the same thing and running each query one at a time? I'm not sure if this can accomplished somehow in the dataset itself or if a SQL Function could do this.
View 2 RepliesSql - Get Multiple DataTables From A SqlDataAdapter?
Apr 21, 2011I'm not even sure what I'm asking is even possible, but here goes:
Is there a way to loop through a sqlDataAdapter to find multiple tables?
Currently I have a module that you pass in an object and it automatically fills the parameters of a stored procedure with the values of the object. It works great, except when the stored procedure returns more than one table, it only returns the first one.
Here is what I tried to get to that second table:
Dim ds As New DataSet
Dim table As New DataTable
Dim reader As SqlDataReader = command.ExecuteReader
[Code].....
Use ADO DataControls With Normalized Datatables?
Jul 11, 2009This is probably a lame question, but I'm just not getting it and I can't find an applicable tutorial.
I'm using VB2008 Express with MS SQL 2008 Express.
Let's say I have a simple normalized database with two tables: One called Teams and one called Members.
The structure for the Teams table looks like Attachment 1
The structure for the Members table looks like Attachment 2.
The team field in the Members table is simply an integer reflecting the associated record for the team in the Teams table and I have established a relation between the Teams and Members tables as reflected in Attachment 3.
What I want to do is use a form with databound controls to permit the end-user to review, edit, add to and delete from the Members table entries. I've used the Data Sources pallet to add a reference to my database and these tables. That has resulted in the creation of a DataSet object, which when I am in form design mode exposes a tree collection of the tables and their fields I can simply drag and drop onto the form surface. So far so good.
I have changed the default control for the field representing the team relation in the Members Table to a combobox because ideally I would like to provide a list of the acceptable input items for the end user. When I drop these controls onto the form surface I have selected the Combo Box tasks helper window and have checked "Use data bound items" and I have tried every variety of different references to display and value members from the referenced instances of the Members and Tables instances but I can't get it working properly.
Using Datatables As Datasource For Comboboxes?
Apr 20, 2010I use single column datatables in combination with the .DisplayMember and .DataSource property to populate comboboxes. Data for these datatables I get from a MySQL database. All this is working fine, but I noticed some behavior for which I can't find an explanation, and am not sure of if it can be prevented somehow.Some of the datatables are used for different comboboxes on different tabs. The behavior found is that with comboboxes that have the same datatable as datasource. If I select an item in 1 combobox, the others automatically select the same item.
-Is this normal, because I couldn't find any documentation on this behavior?
-Can it be prevented, and if so how?
I could use a for next loop and manually add each item to the combobox, but using .DataSource is so much cleaner and more efficient.
C# - Generating Crystal Reports From Datatables?
Apr 8, 2011I need to geenrate a crystal report in an application in which there is only a stand-alone dataset (not connected to any type of database) and I need to generate a report based on the values in datatable.I have my template I just do not know how to generate it from datatable and how to insert in into the templates.
View 1 RepliesC# :: Run SQL Queries On DataTables, Or Similar, Without An RDBMS?
Jun 9, 2010I'd like to have a dataset or datatables, and be able to run SQL statements on them, without using any external RDBMS.For Example, to take take 2 datatables in a dataset and just join them outright with a SQL statement and Where clause, the result being a new datatable? For example if I have 2 datatables, named People and Addresses in a dataset (that I built using code, not getting from a database .. pardon the old fashioned Join syntax):
dim dtJoined as DataTable = MyDataSet.RunSQLQuery ("Select * from People, Orders Where People.PersonID=Orders.OrdereID")
