VS 2008 Loop Through Data Table And Perform Calculations?
Jan 13, 2011
I have an Access database that has thousands of records. The fields in the database are EMPID, FIRST, LAST, JOBTYPE and PAGES. I would like to know how to loop through the data table and for each individual EMPID to calculate the sum of the PAGES for each JOBTYPE.There are four JOBTYPE's: "E", "K", "O" and "R".Here is some
Dim WebAllEmployeeQuery As String = _
"SELECT ELPallEmployees.[EMPID], ELPallEmployees.[FIRST], ELPallEmployees.[Last], ELPallEmployees.[JOBTYPE],
I have an Access database that has thousands of records. The fields in the database are EMPID, FIRST, LAST, JOBTYPE and PAGES. I would like to know how to loop through the database and for each individual EMPID to calculate the sum of the PAGES foreach JOBTYPE. There are four JOBTYPE's: "E", "K", "O" and "R".
How would you go about performing calculations on parts of inputted text in vb 2008?For example: if i wanted to find the number of "a's" in the first 9 letters divided by 9 and add it to the second number of "a's" in the second set of 9 letters divided by 9. Then output the total in a textbox.
I was trying to increase the date value in a textbox automatically be 1 but wont let me do it. I have try to go through the Help but couldnot get something meaningful (or let say i do not get where to go).
I am trying to put together a simple form with prices assigned to Radio buttons and check boxes.
I started by creating a simple form with four Windows Form control, two check boxes and two radio buttons, there is also a NumberUpDown Control for quantity but I have not added that yet.
Basically the user make selections, the price is calculated with total and subtotal and displayed on a label.
I am trying to start as basic as possible then work my way up to more complex calculations as I progress.
Here is my Screw up version: :)
Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
I am working in Visual Basic 2010 Express and have a table with 3 columns created using a SQL dataset called 'test' if you like.The table columns are called A B and C If someone enters a value of 10 in A and 15 in B, is it possible for column C to automatically add them up and come up with 25? - if so how do I start?The above is only a simple example of the problem I have, but once on the right track I am sure I can apply the same logic to the table I actually have?
I would like to know which object shall I use to make a loop within a table. I was used to work with recordset object, working with EOF function in VB6. Now I am lost.
I am using vb.net with phpMyAdmin MySql database. While running the piece of code below, the program hangs in the for loop before the variables are assigned values from the data table(dt)...
'Check for appraisal period----------------------------------------------------------------------- Dim sqlCheckDate As String = "SELECT * FROM tblappraisalsetting where appSetID=(select max(appSetID) from tblappraisalsetting);"
I am having problem with the coding of this (endless loop) and formatting of summary boxes before tests are complete that should not happen. (the overall goals is to have a separate validation procedure that does not calculate or dat displays are not performed until after call function is complete and valid. The validation that takes place are that two boxes are filled in - one is text and the other is a numeric value. (using vb 2008)
I want to create a simple program which can convert Units of Measure (e.g inches into centimeters, milliliters, meters, feet, etc). I want to create a function which has two parameters (unit to convert from and unit to convert to) and returns a conversion value (e.g. funciton passed parameters values inch and centimeter and returns value 2.54). In terms of strategy for the least processing overhead I am exploring a few options. I guess the slowest way would be some kind of nested If/Then or Case loop, so I wanted to use something similar to a 2D table lookup in excel (where the top row and the left column (key?) would have the unit types, and the conversion values would occupy the cells in the table body). Is this possible in VB? Could I load all of this into a 2D array or something? I read a bit about hashtables and dictionaries as well, Ideally Im looking for the least processor-hungry code since this function may be called upon frequently. Ill be using other functions to perform similar lookups on other 2D tables elsewhere too (i.e. matching a value on the top row and the left column and returning the coincident cell value in the table body).
I need a little guidance in the right direction to help with using data from a dataset in calculations. I've watched the "How Do I" Series and it was very helpful in setting up the relations and tables. I have setup a couple tables to hold values that won't be updated and the user will never see. Lets say I have 5 columns, ColmnA to ColumnE, and the row count is variable. What I can't seem to find is an easy way to loop through using the variables. As an example, Lets say the equation would be outputted to a textbox:
textbox1.text=row1(ColumnA*ColumnB+ColumnC^ColumnD-ColumnE)+row2(ColumnA*ColumnB+ColumnC^ColumnD-ColumnE)+etc to end of rowcount
Does anyone know if a good tutorial to point me in the right direction or a code snippet that may get me started to follow the logic? I'm using VS2010Express with a SQLExpress database if that helps.
This works fine but if im using lots of cells it can be quite confusing .I was wondering if there was a way that i can give a cell a unique name so i can be easy for me to identify. Using the above example it could read TOTAL = JAN TOTAL + FEB TOTAL
I have to display all the digits of 2^90. This is within the reach of the Decimal format which can display up to 2^96-1. The Decimal format stops displaying after the 15th digit.The real answer for 2^90 is : 12 379 400 392 853 802 274 899 124 224 (29 digits)
Here is what I do: Dim a As Decimal = 2^90 TextBox1.Text = a
I have a database that dynamically loads from Access into a datagridview. I have to enter data manually into one column in this datagridview. I need to be able to perform calculations to this data, for example I need to sum the data in this column, sqaure it and substract it from individual sqaures of the data in the cells. I should be able to sum it sum(22,33,44,53,67,23)^2-sum(22^2,33^2,...23^2). The number of columns keep changing depending on the database I choose to load, so I need to code this dynamically too. I am not really a VB person. I did the same in excel using Visual Basic and I am trying to do it in this Visual Basic environment.I built a tool in excel(VBA) that do some statistical calculations and data analysis and I am trying to build the same in Visual Basic.
Can I Post a Windows Application that uses Excel for live data calculations? Basically from the Windows app, a user makes a menu selection and which in turn opens an excel file in memory using it for calculations. These files are put together by different groups and formatted for the Windows app to build interfaces based on each file.I also accompany an .mdf file as well. Is all this possible for customers to access and run this with Windows Azure.
The final goal is to use the numbers next to the PU and PD characters to perform specific calculations.
Essentially, I think the code needs to do the following:
1. Read each block of characters ending in a ";"
2. If the block commences with anything other than PU or PD, discard it
3. Extract the numbers in such a way that calculations can be performed. The following is an example:
x y PU4179,27448; PD4179,29951;
[Code]....
Essentially, there will be hundreds of these rows and I will need to sum up the deltas so that a specific formula can be applied.
I have tried doing this a number of ways but each seem very inefficient (using text boxes to store/swap data and creating additinal text files are 2 methods I have tried) and so I'm looking for some direction.
Which is the most efficient and speedy data structure in order to carry out calculations on it?. I have seen, collections, arrays, list arrays, databases and more. I would prefer to write just straight forward code that will be effective and which I can still understand. What I would like to do initially is have the ability to add new draws to the end of the file, edit the individual files and delete lines if required.
File would then be reformatted to show the corrections made. Some kind of data entry window is envisioned. As far as number crunching goes, I would like to make counts of each number in each of the columns , calculating averages, times since last drawn and so on.
Without being too long winded, I would eventually like to find triple combinations and maybe use them as predictions. So there you have it. This way I won�t have to go off on the wrong path, on a data structure that may not be able, or be too slow for the tasks at hand.
I've imported data from a text file using Streamreader and populated a listbox with this in 3 columns. I now need to a) get a total value from the 'Hours Worked' column (sum) and b) put in a calculation to populate an extra column for each entry (Gross Pay) where values are not imported but entered as a result of a calculation.
My current code is as follows: Private Sub btnRefresh_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRefresh.Click 'Program Objective: Display payroll report for National Success Coaches which could be updated unknowingly at any time. Dim name As String [Code] .....
But task to use vb.net for school project. I want a code to help me add a No fo Months(this is an integer) to a datefield to do calcualtion and the result display in a textbox as a date. eg I have 2 fields: Months and startdate, the third field which is the result in a date format. eg 6 months to make a payments, the payment start from 01-02-2011. i want small code which would determine the enddate of the payment period. am getting a problem putting the code together
In my company we use Oracle Applications. Almoust every form in these applications have a common behaviour, which is:
Whenever the forms is opened one can immediately start entering data but one can also press F7, which makes the form to enter in query-mode. You can then fill one or more forms fileds with the data you are searching for and press F8, which executes the query and returns the data into the form. The query mode can be interrupted by pressing Ctrl+Q, returning to data entry mode.
My question is if there is a way of having similar behaviour on building VB forms. I'm using VS 2010.
i am trying to write a program which reads a data from the database and perform some calculations. what i am intending to do is when a user selects an item from a listbox and clicks the submit button the program, calls a function to calculate using the value stored in the database and display the result in a textbox.the problem is i cant store the data retrieved from the database into a variable so that the calculations can be done. i am using vb and microsoft sql server.can anyone tell me how do i store the data retrieved by the query into a variable.
i want to know that how can we add two cells of a datagrid view.I have 5 cells, quantity,rate,discount,tax and Total amount.I want to show the total amount in "Total Amount" cell.
I'm writing a program which has to perform several operations on data exported from a CAD software.The amount of data to be processed is huge and even by simplifying the program at maximum it will still take about 10-15 minutes for average models.
The operations are performed on an array from the first to the last element. Let's say for a list of 10 elements (as example) that I start from element 1 and I finish when element 10 has been computed. I thus thought that since I'm working on a 8 processor machine would be convenient to make use of multi-threading. My idea is, for the case of 10 elements, to make thread1 working from 1 to 5 and make thread2 working from 6 to 10.I already wrote a working code for a 2 thread process which is working, but I want to extend the number of threads and eventually decide in function of the threads available. The basic structure is given below:
