VS 2010 - TaskFactory And Datasets
Aug 24, 2011
I have a taskfactory application that generates new tasks where a task is running a project exe file that involves a lot of classes. Part of the task process involves declaring a dataset and adding a single datatable to the dataset which is then populated with content from results of a sql query. This datatable is then used in the next class and involves iterating through the table and deleting the rows it has already used. When initiating a new task I assume that it will declare its own datatable and dataset but not sure if this will work.
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Apr 13, 2012
I have 4 ComboBoxen and 1 DatagridView into one Form. I make a code, for binding with 5 tables, each is own dataSet and dataAdaptor Is it possible to use one DataSet and one DataAdaptor for 5 Tables, so my code become shorter.
I think the solution is a SQL SELECT query, but i dont no for sure.If it is a SELECT query, ore something else, cane anybody help with make the code i need.
[Code]...
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Sep 19, 2010
Checked out the video on MS website by Beth Massi and downloaded the project.
One query she uses this statement,[code...]
I'm I missing a reference or something? This is an Access DB, does that make a difference?
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Apr 18, 2011
So I'm developing a program were, given some data by the user, the prorgam inserts some records into a database. To insert individual records in different tables I use either the standard INSERT method provided by the Table Data Adapter or a custom Insert Method when I want to insert something slightly differently.Sometimes the user would press a button and an operation where different records in different related tables are inserted. Since each Insert is handled individually for by the DataAdapters of each table, how can I manage to bring the whole thing to an atomic transaction way? I mean, let's say for example the User inserts a new Document in the system, the document has one or many Editions. How could i do something like: if the document was not created properly, then do not insert the editions.
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Feb 3, 2012
I have an existing system that uses an ODBC connection to connect datasets to a SQL Server database. I want to conevrt these to use an OLEdb connection.
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Aug 19, 2011
Im just starting to develop an application using a SQL Database as the main datasource. Now im wondering is it better to use the in-built dataset adapters or write the querys yourself?
If its better to use the pre-generated scripts by using the Datasource UI, How can i use these datasets on a JOIN query?
Example Join
SELECT column_name(s)
FROM table_name1
JOIN table_name2
ON table_name1.column_name=table_name2.column_name
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Nov 24, 2010
Im currently making a program. It loads data from database fields into an combo box. Everything works so far, It just seems to be a mess. Do i need to have all the datasets and data adapters? or can i get away with just using 1 of each. It seems like im doing it wrong, and although it works it seems like a difficult and messy way of doing it.
Also i would like to assign the firshermenID to a variable depending on the fisherman name that is selected in the combo box. When button is pressed: id = fishermanID of the current fisherman (cmbFisherman.text)
[Code]...
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Aug 19, 2011
I just read this post url...Post #2 by jmc states indicates the use of Entity Framework instead of typed datasets.when jmc says something I usually pay attention. I have a large app that I've been converting from VB6 to .Net and I've used mainly typed datasets.It's a single user app that uses an Access database. I'm have no problems retrieving the data from a table or multiple tables and I'm very happy with its preformance.Is it worth scapping what I've done and learn how to use Entity Framework? I should add that I'm near the end of my programming career not the beginning.
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Jan 20, 2012
In a typical session with the program I'm writing, the user needs to be able to access the data in 1 to 500 (maybe) tables (but always only one table at a time). Up to now I've been creating these single table datasets dynamically, as and when required.I've now come across the distinction between typed and untyped datasets (where typed seems to be the recommended option). It seems, though, that typed datasets are created at design time only and not dynamically. Is this correct? Are all of my dynamically created datasets therefore untyped?
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Jul 30, 2009
I'm trying to work with an ODBC driver for Interbase in VS2008 (vb). I succesfully inserted the data tables I want to use in the project datasource. Then I want to add some rows in one of the tables of the datasource. I used myDataSet.addTABLENAMErow(field1, field2, ...).The compiler gives me no error, but when I open the database with InterbaseConsole, the line I've add is not there. Do I do something wrong? Must I open/save the database (how do I do so). I've tried meDataSet.AcceptChanges whitout result.I'm not used to work with Datasets and tables...
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Jan 29, 2010
Anyway to view the content of a dataset or datatable in debug? I don't mean looking up a specific element of the dataset but to view the hole thing.
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Mar 14, 2009
difference between the two statements given below
1. Dim ds as new DataSet
2.Dim ds as DataSet = New DataSet
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Oct 8, 2010
I'm trying to combine two datasets, each with 1 datatable and each having the same schemas. Datatable 1 would have a list of records. Datatable two may, or may no, have some or all of the records from table 1 plus more records. I would like to remove all the records from table 2 that are present in table 1.
This is what I got so far:
For Each table1 As DataTable In ds.Tables
For Each row1 As DataRow In ds.Tables(0).Rows
ds.Tables(0).PrimaryKey = New DataColumn() {ds.Tables(0).Columns(0)} 'Where 0 is the index of the column that's your key
row2 = ds2.Tables(0).Rows.Find(row1("ID"))
'if its found, delete it
Next
Next
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Aug 2, 2011
how to join two datasets together.
First Dataset
Dim sql As String
sql = "SELECT payment.Debtor, SUM(Value_invoice) AS before_this_month,debtor.nama FROM Payment INNER JOIN dbo.debtor ON Payment.Debtor = debtor.debtor" & _
[code]....
Now i just want to either inner join or left join PaymentBeforeThisMonth and PaymentThisMonth into another dataset?
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Feb 10, 2011
I have a dataset that contains only employee ID's. I need to loop through that dataset and for each employee ID I need to loop through several other datasets and pull data. I need help with this looping syntax. Here is a sample of some code that I am receiving an error with:
Dim EMPID as Integer
Dim CommandEmpid As New OleDb.OleDbCommand
Dim EmpidDS As New DataSet
[code]....
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Mar 2, 2011
I have a form that needs to load data for 20 different combo boxes - the data is always the same. To get the combo boxes to function properly i need to create a separate dataset for each combo box. Doing this when the form loads takes it about 7 seconds each time a search result is double clicked and the form pops up displaying the correct data. The form is bound to the main table. Is there a way to store these data sets in memory somewhere so the user can close the form but still have them loaded? I can put this code behind the login form and it works until the form is closed, then the combo's no longer load.[code]
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Jan 8, 2010
i want to check if datasets have changes and after that use msgbox (vbYesNoCancel) when program closes ,when i wrote this code it had error "Operator 'Or' is not defined for types 'System.Data.dataset' and Boolean"..[code]
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May 17, 2009
I want to use my main dataset (dbds) on a second form. It's simple, on my main form, the user clicks a button, opens a new form, they enter an item number and I want to find that row, and change a value in another column of that same row, and have that be in effect onthe main dataset to send back to the database.[code]...
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Dec 3, 2011
I have declared a dataset (let's call it 'Fred') as public in a VARs module. In the main form in a sub routine called at the start of the project I connect to an Excel spreadsheet and read it into the 'Fred' dataset into one table (called 'Table') I then bind the dataset table to a datagridview and I can see the spreadsheet. Which is very nice :-)
Having loaded the dataset I want to be able to get some values so I created a button and used the following
msg = Fred.Tables("Table").Rows(0).Item("Name")
I think this should get the value in the first row and in the column called 'Name' in the table called 'Table'
But I get an error when I click the button 'Object reference not set to an instance of an object' which I think means I need to use the 'New' keyword...
So I added to the button
Dim Fred = New DataSet
But I get the same error.
Now I have to admit that I've never really got my head around how to use the 'New' keyword and would have hoped to be able to get data from a dataset through my entire project - especially as I've declared it as 'Public'. Surely if I use 'New' all over the place then I create new datasets
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Dec 1, 2009
What is the best way for me to have several datasets ?i've thought about creating a routine for creating datasets with a number in their names, each one with the desired data, but that's not very intelligent (although might work)i'd like to create what would be like an "ARRAY OF DATASETS"
[Code]...
(obs, i've done the same code loading one XML to one dataset and it works perfectly, i've gone back and forth more than one time to assure that it isn't just a logical mistake, it's syntax and lack of programming knowlegde.
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Sep 4, 2009
I need to very quickly write an exe system on a laptop where when the laptops are connected to the network they read a database table and store the data locally, so staff can use the laptop while they roam.The laptops have quite small capacity and the company would prefer not to use SQL Express or Access.
My question is, can the data initially be downloaded into the exe application via a dataadapter and dataset, and will that dataset the retain the downloaded data, or will I need to ensure the dataset is written to an XML file and then loaded/unloaded each time the laptop application is started while the staff are travelling ?
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Sep 16, 2010
What I'm looking for are videos in vb.net for console application that will show me how to use DataSets and TableAdapters step by step. Please provide links
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Oct 14, 2011
I'm using the MYSQL .NET connector with an adapter to fill a dataset from a SELECT statement. Between different SELECT statements I use the DataSet.Clear() function. The Getxml shows me that the dataset is empty, however when cycling through the Table's columns, I have all the columns from all the tables used in prior SELECT statements.
How do I go about that without Dimming new Datasets for each table?
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Jul 11, 2009
I'm not sure, if this is possible, but what I would like to do is fill a DataTable with results from "SELECT TABLE_NAME FROM myDB.INFORMATION_SCHEMA.TABLES" and then fill individual data sets in a For Each loop. I'm able to fill a data table with the table names I want to populate, and I can update my SQL Command of the SqlDataAdapter, but when I try to fill the data set by using the results from the row, I run into an error that I can not convert a string to a DataTable or DataSet. Each DataSet is named just like the table name. The code is at home, so I can't paste all of it here, but hopefully, you understand, what I mean. A small amount of the code that I remember is below, and this is inside a Using block connecting to a SQL Server.For Each row as DataRow in dt.rows
tsql = new SqlCommand("SELECT * FROM myDB.." + row("TABLE_NAME"), mycon)
oleda.SelectCommand = tsql
oleda.Fill(row("TABLE_NAME"))
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Oct 16, 2009
I have a report where I need the same data, but for four separate date ranges. Currently this data is based on one month, so it's just one dataset. But now I am trying to do this with four separate datasets, where each one is filtered on each of the four date ranges. I setup my WHILE loop to loop thru all four dates. But I'm having trouble now with distinct naming these datasets. Is this the best way to do this? It looks like if I used multiple datatables for one dataset, I'd have to define each datatable column. Here is my current dataset commandstring
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Apr 13, 2010
I'm trying to merge two datasets based on these rules:
1. With ds1 and ds2, If the Unique Key from ds1 is not found in ds2, copy it to ds2 and move to next row in the table, else, goto the next part
2. If the unique key in ds2 is found in ds1, check the DateLastEdited row.
a. If DateLastEdited in ds2 is greater then in ds1, copy the row from ds2 to ds1, else , do nothing
I'm just having trouble with the loops. Here's what I have:
Dim ds1 As DataSet = fillNetwork() 'this function fills ds1 with the dataset from a table found on a network
Dim ds2 As DataSet = fillLocal() 'this function fills ds1 with the dataset from a table found on local drive
Dim returnRows() As System.Data.DataRow = Nothing
For Each dtDs1 In ds1.Tables
[Code] .....
This bit of code is just trying to segregate the one that are in both tables from the ones that are just in one table.
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Mar 10, 2010
How To Join Two Datatables From Different Datasets (With One Commn Column) ???
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Nov 1, 2011
All I really want to do is a join. Table 1 and Table 2 both have a number that would link the two together. I want to join two fields from Table 2 onto Table 1. I need to have two datasets because there are two different connections being made.I want to push this onto a DataGridView, which only allows a single datasource. So I'm thinking I would need to make a temp table somehow, but since I'm pulling from two different datasets I don't know if that's possible.
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Mar 19, 2010
I have two datasets called ds and ds1 that I want to merge into a grid. I get data from the first dataset to display in the grid but the second dataset where I want to display a count I don't get any data from it. I am trying a ds.Merge(ds1). here is the code i have for the sub.
1. Public Sub LoadSessionDateGrid(ByVal iSchool As Integer, ByVal iProgram As Integer)
2. Try
[Code].....
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Mar 20, 2010
I have two datasets called ds and ds1 that I want to merge into a grid. I get data from the first dataset to display in the grid but the second dataset where I want to display a count I don't get any data from it. I am trying a ds.Merge(ds1). here is the code i have for the sub. What am I doing incorrectly?
[Code]...
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