Retrieve Data From Two Or More Tables?
May 6, 2012
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]....
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Oct 29, 2011
This is my coding in vb.net. I have used two database (1) party (2)partydup. Structure of the tables: party table: fields :code, name1,add1,add2 etc. partyduptable: fields: code, description
In both tables i have common field ("code"). I tried to retrieve the value of "description" field from partydup table when the "code" field in both the tables are same. I run the below coding but it is showing the error as "No data exists for the row/column". But i have a record which contains the code field value as 123 in both the tables. Still it is showing the error.
Imports System.IO
Imports System.Data.OleDb
Imports System.Data.OleDb.OleDbConnection
[Code].....
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Apr 6, 2011
I m trying to retrieve all tables with thr names to a listbox from my access DB.My DB in remotely located
Imports System.Data.OleDb
Public Class Form1
Dim objconn As OleDbConnection
Dim objcmd As OleDbCommand
[Code]....
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Jul 25, 2012
I 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:.....................
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Jan 15, 2012
I was just wondering if I can retrieve two tables from my database to one form? because i'm trying it but it doesn't seem to be working. just the first table i'm trying to retrieve is working.
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Sep 28, 2009
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?
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Sep 28, 2009
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
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Jul 27, 2009
I 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]...
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Dec 5, 2011
i am trying to join 2 tables together and display them in a list view. i have this code so far
[Code]....
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Jan 25, 2011
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....?
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May 25, 2012
I 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.
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Apr 9, 2010
I have three tables in SQL server which I would like to show and access on a form. Table 1 contains account data, address, contact details etc. Table two contains data attached to a Person, tel no , Mobile no, Email etc. Table three contains details on what awards the person holds, i.e. one person can hold several awards.
Therefore I have a one many relationship between the first two tables and a one many relationship between the second two tables. This is set up in SQL
The first two tables are shown on a form, table 1 via a set of text boxes, table 2 via a datagrid control.
I would like the functionality whereby I could select a row in the datagrid showing the persons name and find the Persons_ID number then use that as a filter to a second datagrid view so that only the selected persons awards show in the datagrid.
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Dec 1, 2010
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.
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Apr 11, 2011
i want 2 select data from data gridview and want retrive that data into another form in to the textbox ...is it possible ? i 'm doing like this for that
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.[code...]
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Mar 11, 2010
I want to obtain the individual data in rows and columns from my database. I mean after loading the data in a data table.... I think I need some attributes of the data table, so as to obtain data from the rows and columns.
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Oct 2, 2009
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].....
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May 16, 2010
I'm trying to develop a windows application, I'm using VB.NET(Visual Studio 2005) and MySql database.
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Mar 27, 2010
this 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]...
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Oct 3, 2009
[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?
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Aug 11, 2009
I 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]...
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May 21, 2009
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.
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Apr 1, 2009
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.
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Nov 19, 2011
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 ?
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Jan 18, 2009
Does 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]....
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Jun 12, 2009
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.
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Mar 20, 2010
This 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
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May 12, 2009
I 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?
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Sep 16, 2009
I have an application that I have in VB Express Edition 2008. I have an MS Access database (Access 2003) that I have created a data reference to one of its tables. The table contains 3 fields ID (Counter), Name and Price (text and double). When my form loads I simply want to read each record in the table and create a variable with the same name as the product name and assign it a value the same as the price in the table. So, record 1 in my table has Prod1 in the name field and 2.59 in the price field. I would like these variables to be created when the form loads and be available until the user exits the form.
It seems simple but I cannot find reference to a similar situation anywhere I have looked.
In the Form_Load routine the following line was generated via the designer:
Me.PricerTableAdapter.Fill(Me.PTODataSet.Pricer) assist if possible.
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Apr 14, 2009
I have a VB.Net dataset that contains data from multiple tables. how to query data out of the dataset. I want to run SQL-like queries on a dataset to extract data that fits a certain "where" statement.
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Jun 21, 2010
The situation: I have a small application where i store customers and orders.. In my database i have a tabel called Customers and a tabel called Orders. These 2 dabases are joined on Customer ID - every Order record contain a row with the customer Id.
[Code]...
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