I am engaging to build my first project with a database connection and have a question before I go any further:In MS Access when you create a form you have the option to put a subform in and link the data so that each time the main record changes that sub data changes too.My Database and table are complete and ready to go. There are perfectly normalised as well.How can a similar procedure be achieved in VB.Net ?
View 5 Replieshow to input data in mysql, different tables with one query?is it possible to do in gridview in vb.net 2008?
View 4 RepliesI am using VS2008 and SQLite. I have created a database and several tables and am attempting to populate the tables with data from arrays.
The following code (example) works fine but stops after it inserts 30 to 50 records. I am running the VB code in debug mode and when it stops, I press pause to see where it is. It stops on "SQLcommand.ExecuteNonQuery()" and when I press continue (F5) it will insert another 30 to 50 records.
I do not get an error message. Is this a timeout issue? How do I keep the loop running to the end of the array?
Following is example code.
Dim
SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLiteCommand
CODE:.....................
I have three tables under one database. I'm using the built-in Navigator control for now until I get this figured out, but I'm using a button command instead of the built in navigator button. I need the "Save" button to save the data in the text fill boxes to save to the corisponding table. I used the drag and drop option to drop rows from each table to the form. See code:
Private
Sub Button1_Click(ByVal
sender As System.Object,
ByVal e
[Code]....
I am creating a form in VB to enter customer sales invoices and need to update two tables i.e. InvoiceHeader and InoviceDetails. The Invoice details can have more than one line for one Invoice header. I was wondering if there is any thing like Access subforms or how can I update both tables through an SQL statement.
View 1 RepliesI install Visual Studio 2008 Professional Edition and I don't see on the templates the Data Form Wizard...
how can I install the template?
I want to used to create windows forms from my tables.
I have an XML file that has a basic hierarchical structure about horse racing. It has a summary of the tracks, some data about each track, then a list of all the races at each track racing that day. So lets say there are 10 tracks, and for each track there are 8 races. This is a snapshot of the data....
HTML
-<Meetings xmlns="" Jurisdiction="VIC">
-<Summary MID="MR_20110801">
<VenueName>ECHUCA (VIC)</VenueName>
<Type>R</Type>
<Events>10</Events>
<Track>DEAD </Track>
[Code] ......
I have written the code to pull down the data into a data store, but I dont know the BEST way to put the data into a set of tables. My first thought was to traverse the nodes and add rows into tables but I figure there must be a native VB process that reads the xml and puts it into the the appropriate table. How to code up the process for getting the data into a set of tables that match the xml. So lets say I have a Summary table, I would like all the data about each track to go into that table. Then I would have a Races table and have the data for each race go into that. What I have done already is import the xml into Access to create the tables (which was a breeze!) and then link that data source to my project. So I have the tables already built.
I would like to know the best, or standard, way to accomplish real-time client updates in a small multi-user application using an access data table as a data source.Specifically, this application will be used by 3-4 people. It uses a datatable which is filled on form load and bound to a datagrid at design time. The datatable is stored on a shared drive. The data table on the shared drive is updated in two ways:
1) Users can update the datagrid which then updates the datatable on the shared drive via the data adapter's Update method.
2) A server application does some work on some text files, periodically updating the data table.
I need the clients to reflect the changes to the data table on the shared drive as closely to real-time as possible. I know that the data table stored in memory on the client is disconnected from the data table on the shared drive, so I must query again to get the updates.
1) Is there an alternvative model I can use which is connected, and which will automatically reflect the updates in the data table on the shared drive?
2) If not, what is the best way to check for changes in the data table (so I can know when to call the data adapter fill method)? I am planning to poll the drive for a change to the .mdb file, raise an event and then fill the data adapter when the event is triggered. I am using this method successfully now to check for changes to a text file in another application, and I know how to implement it?
I would like to know the best, or standard, way to accomplish real-time client updates in a small multi-user application using an access data table as a data source.
Specifically, this application will be used by 3-4 people. It uses a datatable which is filled on form load and bound to a datagrid at design time. The datatable is stored on a shared drive. The data table on the shared drive is updated in two ways:
1) Users can update the datagrid which then updates the datatable on the shared drive via the data adapter's Update method.
2) A server application does some work on some text files, periodically updating the data table.
I need the clients to reflect the changes to the data table on the shared drive as closely to real-time as possible. I know that the data table stored in memory on the client is disconnected from the data table on the shared drive, so I must query again to get the updates.
I have two questions:
1) Is there an alternvative model I can use which is connected, and which will automatically reflect the updates in the data table on the shared drive?
2) If not, what is the best way to check for changes in the data table (so I can know when to call the data adapter fill method)? I am planning to poll the drive for a change to the .mdb file, raise an event and then fill the data adapter when the event is triggered. I am using this method successfully now to check for changes to a text file in another application, and I know how to implement it
how to make a report which is from join tables!
View 13 RepliesI have two data tables within my data set that are loaded onto my form on form_load using statements written in code (not the designer. When I change a value for the first table via a text box the change is made to the data set. But when I try the same for the second table, the change doesn't remain in the data set when I switch to a different company and come back. I query the second table using the primary key of the first table but no code is needed when I change the values for the first table so I don't understand why the same doesn't work for the second when I change a value via a data-bound text box....
Here is my code that initially binds the data:
'This is used to read our data from the data base
Public Sub Read_Data_SQL()
Call Clear_Bindings()
[CODE]...
Here is the code I call when the selected index of my company combo box changes to have the second table reflect that of the first:
'This sub populates any information contained in the Contact2 table
Private Sub Update_Contact_2()
Dim Company As String = cmbCompany.Text.Replace("'", "''")
[CODE]...
i am trying to join 2 tables together and display them in a list view. i have this code so far
[Code]....
if it affects the run time of a program if I were to have multiple data tables as opposed to one data table with all my data in it? I am trying to minimize datagrids and just use code to access table data, in hopes that it will speed up my program. But I am ignorant if multiple tables vs 1 main table will make a difference because there will still be the same amount of overall data present in my program one way or the other....?
View 3 RepliesI have been trying to find and/or think up a way for data to automatically update a data table.I have a log that shows all the customers that came in today with various information. There could be twenty or thirty employees adding to this log or updating or doing things with that customer. This information is in a Data Table on a ASPX page in Visual Studio 2010 that the code is binded in the aspx.vb page that is calling a page in my APP_CODE database file that calls a query in my Database to get the information.My question is could someones actions on a different computer make my computer refresh or to re-bind that data.I have thought of some kind of timer/counter maybe that looks to see if the count of the log is different.
View 2 RepliesI've recently created a MVC 3 ASP.net application (using VB). I have also created forms validation by running aspnet_regsql. I used this to create the table in the same database as my application uses. I am trying to work out how to create a new model, with a FK from the Users table. Do I have to reverse engineer the validation tables to create models in my application? right now, the tables only exist on the SQL 2008 database, as they were created by running the aspnet_regsql command, and do not exists as models in my ASP.net solution. Here is the code I have now, for a model I would like to add a FK to (as a one-to-many relationship):
Imports System.Data.Entity
Imports System.ComponentModel
Imports System.ComponentModel.DataAnnotations
[Code]....
I want to have a drop down menu with the values:
Year 7
Year 8
Year 9
And I want to display different tables for each the values selected in the drop down menu. For example, when the "Year 7" value is selected in the drop down menu, a table is displayed for that year.
I am about to commence a little project whereby using a forms based application to visualise temperature in a building over a day. I am using data loggers placed strategically around the building (these record temperature and time of the read). I am planning to use a picturebox with the buildings floor plan within it and on using a scrollbar (using time as the metric) scroll through the day with temperature being represented by the size of the graphics on top of the floorplan (these represent the location i placed the data loggers around the building).
I have already built a tool to digitise the location of the loggers on the floor plan (saves the data loggers id ref and x y coordinates in the picturebox back to an access datatable).I am planning to use loops on scoll to draw and resize the graphics in another picturebox. The data loggers could be many (up to 30 or more) hence i am concerned this might grind to a halt or become so staggered that it will cease to be useful.The question i would like to ask is is this the most efficient way of doing this or am i going down a dead end.
Quite a few threads on passing data from one form to another, but I'm struggling to work out how to share data between the two - back and forth.
For example:
Class1 is a class with 10 string properties
Form1 has 10 labels ("Label1", "Label2" etc) and a [Configure] button.
Form2 has 10 textboxes and a [Apply] button.
I want to load with Form1, and create an instance of Class1. Click the Configure button and load Form2, passing Class1. On Form2 I want to manually fill in the 10 textboxes and hit Apply. The Apply should update the Class1 instance and close the form.
Form1's Label controls should then be updated with the data from the Class1 instance.
I'm fine creating the forms and classes, as well as passing the class into Form2 with a custom Sub New(EmptyClass as Class1) constructor. This gets the empty class into Form2, but how can I get the populated class back to Form1?
As Form1 already exists I don't want to create a new instance with another custom Sub New(PopulatedClass as Class1)
It's also key to be able to use the Form2 multiple times, basically ending up with a Data class being displayed as part of Form1 but updated using Form2? (For example if the Class has already been created and populated with data when it's passed back to Form2 for the second time I would pre-load the Textboxes with the values already in the class).
i wanted to add data from a single form in vb to two tables in access but an error appears saying that the field customer_ID down to Contact_Number doesnt belong to the table record, though it really doesnt belong to that table.. but i already indicated the table for the customer_ID down to Contact_Number, which is Customer, in my sql statement...
Public Class Refill
Dim connect As New OleDb.OleDbConnection
Dim sql As String
[Code].....
I'm trying to develop a windows application, I'm using VB.NET(Visual Studio 2005) and MySql database.
View 2 Repliesthis is the code i am using to print the contents of my datatable:
Private Sub PrintDocument1_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
Dim xPos As Single = 120
Dim yPos As Single = 120
Dim i As Integer = 0
[Code]...
[Code] what i really want is to add another table to my database with different fields with my first table and have my form in vb input data to the two tables. i already tried it but i always have errors. what should i add to my code?
View 2 RepliesI have 2 DataTables in vb.net. Each is populated from it's own stored procedure. Table A contains a project number in the first column. Table B also contains the project number in the first column. Table A could have many records that have the same project number, but Table B will always have just one record in it per project number. I would like to append the data from Table B to every matching record in Table A. How would I do this?
[Code]...
I am using VS2008 Standard, Access 2007 and VB.net. I have an Access db with a Membership table, a DuesPayment table and a table linking the two together.
[code]....
1) In VS I have a single form (frmMembership). I used the Data Sources window to create a single datasource containing the tables tblMembers, tblDuesPayment and lktblMemToPay. from the 'Data Sources' window I drug tblMembers, as text boxes, to the form. I drug tblDuesPayment to the form as a DataGridView.
I right-clicked 'dsMembership...Edit in Dataset Designer' and checked that the relations between the three tables was as shown above. I left all other settings as they were created by VS.When I execute the app I get the member information as expected and can use the TblMembersBindingNavigator to step through the members. The DataGridView, instead of showing dues payment information for the member showing on the form, shows ALL of the dues information for ALL members does not exhibit any relationship between tblMembers and tblDuesPayment.
2)I also tried creating a dataset for tblMembers only. Then I used 'dsMembership.Edit in DatasetDesigner' window to create a TableAdapter for tblDuesPayment and lktblMemToPay. I got the same results.
3) I tried various other combinations, like creating TableAdaptors for tblMembers and a TableAdaptor for a combination of lktblMemToPay & tblDuesPayment.
I am making a survey-application in winforms that is connected to a MySQL database. Now I want to show the alternatives of a question, and how many answered each question. I have a table for alternatives called tblAlt and a table for answers from users called tblAnswers.
There are only 5 alternatives for each question. Is there a way to get each alternative, and how many answered each of them with one query?
This is what I made so far, but this is definitely wrong:
SELECT tblAlt.altText, Count(tblAnswers.answerID)
FROM tblAlt, tblAnswers
WHERE tblAlt.questionID = " & CInt(questionID) & "
[Code]....
How can I save data in the textbox to two different tables? I have it bound to tableA to display data and I want to save that data to tableB and tableC when I click save.
View 2 RepliesDoes this work the way I think it should?
Private _adapter As New SqlDataAdapter("Select CaseId, CaseNum, DateLoaded, Status1, DateDiff(mm,DateLoaded,GetDate()) as mm From Case_T" _
& ";Select CF.CaseId, CFV.VendorId, CFV.DueDate From CaseFileVendor_T CFV Left Join CaseFile_T CF on CF.FileId=CFV.FileId" _[code]....
hello everyone, i m using treeview control in vb .net . How do we usee a recursive function to add data at different levels from different tables in a database.
View 2 RepliesThis is a winform and I'm using mysql as a database, here is my code:I'm trying to add data into multiple tables.[code]Index and length must refer to a location within the string. Parameter name: length
View 2 RepliesI am used to creating a data set with data from one table, for instance:
[Code].....
Now I am needing to add a second table. For instance, my second table "EQUIPMENT" has a field called "DESCRIPTION" that I would like to add to my dataset. The "WORKORDER" table has a field called "EQNUM" which is what the "EQUIPMENT" table uses as the primary key. how to combine these into one dataset?