Multiple Data Tables Vs One Grand Data Table
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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Oct 5, 2009
I am combining data from multiple tables into one table for a presentation software. I am doing a select statement and running a loop. Inside that loop I have multiple selects and I build a datatable an enter the data into the main table. There is a ton of records and it takes forever.
'Requisition Demands
InsertStr =
"SELECT COUNT(*) FROM Requisition WHERE (DMD_DT = " & dateVal & ") AND (QTY_REQ > QTY_PEND_CANC + QTY_CANC + QTY_REJT) " & searchvalString
[code].....
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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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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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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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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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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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May 25, 2011
i've a form which displays data from multiple tables of the same employee(personal details, salary details, etc...) and have a common field 'Empnumber'I want to retrieve data from all of them to be displayed in the form. Am not getting the sql statement required for this. the code i use is, rs.Open("Select * From employeetable,payroll,misc where employeetable.EmpNumber='" & text1.Text & "'", CONN, 3, 3) where text1 has the empnumber for which details are required and empnumber is the common field in all the tables...
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Dec 30, 2009
I fill DataSet from Access Database then create Datagridview to display data. My problem is how to Save Data back to a different table in Database then the one used to create the DataSet? I'm using Visual Studio 2008 and Visual Basic 2008.Original Table used to fill DataSet is called RecordList the new Table will be RecordListReport.
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Nov 28, 2011
I'm trying to read data in Visual Studio from multiple tables. How do you read data from different tables? Do I have to create
[Code]....
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Dec 30, 2010
I have four forms only. The first one is the main menu, that contains three buttons, the first and second buttons go to form2 and form3;Button 3 should open a new form (4) and to write there just the total price.
In Form2: DataGrideView that contains a table made by MS Access 2007. That table contains only two columns and three rows. When you select the item, the price of that item should be saved to be added to the other selected items
In Form3: ComboBox that contains another table also made by Access2007. The same thing, the table contains two columns and the selected item has a price that should be summed with the first selection in Form2.
My Questions are:
1. What I did by adding data from MSAccess2007, is it right?First: View -> server explorer -> Browse(my database) -> Test Connection --> OK ...Second: Data Sources --> Add new database --> etc Third: I dragged one table and put it inside Form2, then the another table to Form3.Is that all right? <--- This is my first question.
2. Now, is, what I have done in step 1, enough to pick up the price of the selected item(s)?if not, what is the code that I have to write to make this connection, and where?
3. As I said, when I click on Button3 in Form1, Form4 should appear and give me the grand total. How I can write a code that makes this summation, and where?
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Oct 11, 2009
how to display data coming from different tables in access in a form?...the case is this:
3 tables in access:
AddBook(tablename) - ISBN(primary key), Book_Title, Author
Student(tablename) - Student_ID(primary key), Student_Name, Course, Year
Transact(tablename) - Transaction_No(primary key), ISBN(foreign key), Student_ID(foreign), Date_Borrowed
i think you can already picture it out... so what i want is to display data from Transact table and also display the data from Student and AddBook table base on the value of the foreign keys in Transact table....
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Jan 4, 2009
I am new to VB and I have a database that has three related tables. These tables show information about computer engineers.
table one is engineers details
table two is engineers allocated
table three is jobs
My form needs to have buttons where a user can obtain information
View details of all Engineers
View Names of all the Engineers working on a specified job.
Add a new engineer
I have set up the connection to the data base using the wizards and also made the dataset. How to handle retrieving the data from multiple tables.
Here is a screen shot of my data set
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Mar 18, 2010
I'm trying to read from two tables in mysql:
[Code]...
Or even other techniques on achieving the goal of reading data from two tables using data reader? This is a winform, not a web form
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Sep 10, 2011
[Code]...
I have Memberships and Bookings tables in database containing an attribute cust_id which is primary key in Memberships and reference key in Bookings. When i am executing data reader I want it to read cust_id values from membership table but it is reading it from the bookings table.....
[Code]...
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Jun 4, 2012
I want to update data within multiple tables using sql command object. I have following codes which would not be updated the data.[code]...
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Oct 29, 2009
how to compare 2 sql tables and show data that are in table 1 but not in table2?
Dim strSQLL As String = "Select t1.run from ML533 t1 left join portal t2 on t1.[run] = t2.[runNo] where t1.[run] <> t2.[runNo]"
Dim comm As New System.Data.SqlClient.SqlCommand(strSQLL, conn)
Dim ds1 As DataSet = New DataSet()
[code]....
i have tried google and other sites.. but still cannot find solution. maybe i post the wrong question. but i manage to do this code. but its only shows only 1 record missing, but its supposed to show 5 records that r missing.
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May 28, 2010
I'm using a SQL database and I want to bind five tables to one Binding Navigator.
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Mar 24, 2009
I'm an experienced Office & VBA programmer, I am new to .NET programming. I'm in the process of migrating an Access 2007 database application from Access to Visual Studio Visual Basic project for further development. In particular, I am interested in using .NET controls to display data in a user-friendly hierarchical grid control.The data for each hierarchical display is stored in two separate tables (I call them tblData and tblExtraInfo), and then I use a query to join the data and prepare for display (I call the query qryBOM).
[Code]...
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Feb 5, 2012
SELECT
Login.LoginID, Student.[Student Name], Student.[Student address], Student.StudentID
FROM
Login
INNER JOIN
Student ON Login.LoginID = Student.LoginID
WHERE
(Login.username = @user) AND (Login.password = @pass)
RETURN
How do I display the Student Name, Student Address, StudentID, and LoginID into multiple textboxes?
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Feb 13, 2011
I have looked at the answers in the forum and some seem dated. I an an old vb2 person and need to move up. I understand sql very well and use complex queries. First test project and trying to add multiple tables to a data grid (Only Form in project).I used the Data wizard to add the Access data base and worked by way through to near the end. The query works in the wizard and returns the correct rows. The error message is "The solution returned by the new query differs from the base query."
During the creation process I selected all the tables. Reading some of the old anwsers I get the inpression that VB 2010 does not handle multiple tables in a datagrid (forum items go back to version 2008).
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Feb 5, 2010
I have 3 tables. customer,item, pricing, each with keys customerid,itemid,priceid. pricing is related to customer and item tables by a 1 to many.pricing (priceid,customerid,itemid,price)
[Code]...
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Jun 2, 2011
I am trying to create a datagrid and export the contents to a text file using VB.NET and I am doing this inside an SSIS script task in order to automate the process to export a dynamic table to text file. I don't get any error and the files are created but the files are empty. [code]
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Sep 30, 2009
I am working on an application for Point of Sale system in .Net 2008,vb with MsAccess as database and now i am on the final part of this application which is inventory module. Where in that module i have created Stock table and I have two tables related to stock.
[Code]...
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Jan 16, 2012
How to insert multiple data into mssql without using loop?
i'm developing a clinic management system, while doctor may give few medicines to patient,therefore i hope inside my database,the data will look like
[Code].....
this is my 2 tables, i hope when storing data ,the recordID will not increase based on how many ItemID inserted.
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Jan 16, 2012
my system is kinda doctor gives prescription and medicine, and store related information into database. The case is when a doctor give few medicines to patient, those information have to store in a "RecordID" with few"ItemID" [Code]. anyone knows how to solve my problem, or any similar sample project can give me to refer? [Code].
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Dec 12, 2011
I have a vb6 code block
Private Sub CmdSave_Click()
On Error Goto LblErr
con.BeginTrans
[Code]....
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Feb 11, 2012
This is the Query:
DELETE FROM patientpersonal,patientmedical,patientdental
WHERE patientpersonal.'" & dpatientid & "' = patientmedical.'" &
dpatientid & "' AND patientpersonal.'" & dpatientid & "' = patientdental.'"
[code].....
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