Sql - Speeding Up .net Access Query To Populate An Array?
Nov 23, 2010
Dim Builders As New System.Data.OleDb.OleDbConnectionStringBuilder
Builders("Provider") = "Microsoft.Jet.OLEDB.4.0"
Builders("Data Source") = "C:UsersJohnDocumentsVisual Studio 2008ProjectsSimpleSQLTestSimpleSQLTestdictionary.mdb"
[code]....
So trying to speed up the query. The read of the last item is just to see how long it takes. I do a different method in VB6 and it loads very quickly. Trying to load a dictionary that is over 200,000 rows.
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Jul 6, 2010
Is it possible to populate an AutoComplete text box property in code from an Access query.
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Mar 11, 2010
how to take a query that returns a single row of data and load that data into textbox controls.I know about ExecuteScalar but it is only good for a single column of data from the query.
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Apr 13, 2011
I come from Access and I am developing now my first windows form app in visual basic 2010 based on a Access database *.mdb. The thing is i have an access db with 5 tables. I have created the forms, connected to the database, all is working great. Parent- child relations are working, datagrids and comboboxes populate the right way, buttons are working.
But now I want to populate listbox, and combox from tables with queries. Like in access I would like, for example to populate two different listboxes bound to the same table with different queries, so that the listboxes give different results, based on different variables or textboxes.
But I don't know how to attack the problem: the query works against the tableadapter, so the info it gives back is always the same. I have tried to duplicate the tableadapter of the table i want to query, writing different sql queries in both, but it does not seem to work. I don't know in what direction I should ivestigate: LINQ, sql queriess, coded queries, filtering the listbox...
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Aug 12, 2011
I am developing a VB.NET ASPX file. This report is currently working but now I want to add a parameter which should be an array list displaying all records from below SQL query[code]...
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Jul 20, 2010
I'm trying to populate a rich text box with the result of a query. (Detail - I'm trying to display a table trigger using sp_helptext - this returns a row for each line of the sql syntax)
This doesn't work obviously but gives an idea:
Code:
Dim myConn As New SqlConnection("server=testserverSQL2008;uid=sa;pwd=Pa$$w0rd;database=testdatabase")
Dim query As String = "sp_helptext 'Some_Custom_Trigger';"
[Code].....
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Apr 18, 2010
I have added a query to my form using the sqlDataAdapter object and the wizard.Now I want to show the result of the query in a combox on my form.The combobox is not binded to a data source, but is going to be used for searching a record (but this is for later)
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Sep 30, 2010
I am new in vb.net 2008.I want to populate items of a combobox with a result of a query that may include join or not.
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Mar 31, 2010
I have 8 thumbnails on a thumbnail browser page where each thumbnail is just a rectangle from the main image, not the whole thing.
Problem is, this needs to run on some fairly old machines where it's too slow in VB.net although the old VB6 version worked fine. Any obvious ways of speeding the following code up, or do I need to go back to API or use separate thumbnail images?
Private bmp As Bitmap
Private bmp2 As Bitmap
Private gr As Graphics
[code]....
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Apr 28, 2010
I am connecting to an Access database and using a parameter query with the LIKE operator to return all rows that match query. The string to search for is taken from a Textbox
sql =
"Select * FROM Allview WHERE Info Like" &
"*" &
CStr(TextBox1.Text) &
"*"
The query does not return any data in vb, but when run from access with same string, there is data returned.The connection to the database is done correctly, as I am able to return data with various other queries.
Partial code :
Dim
con As
New OleDb.OleDbConnection[code]....
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Apr 7, 2012
I am trying to run a query an Access db from VB. The general query which I want to run is
SELECT * FROM Patient WHERE Patient.PatientID = ?
or SELECT * FROM Patient WHERE Patient.PatientLname = ?
I tried using an input box which captured the user input and pass that variable to the query, but that failed. Then I read about writing a function and using that, however, I keep getting an error which says Function not defined, but when stepping through the code, it seems to work. Here is my function: [Code]
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Dec 31, 2011
May i have a working sample on how to retrieve records from a DB & populate the relevant textboxes after a selection at a dropdownlist. What i have is definitely not working & im working on VS 2008. Can anyone show me the way?
[Code]...
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Dec 17, 2009
populating a Listbox control with the results of a T-SQL query in VB.NET? Here is some code to start with:
Dim myconnection As SqlConnection
Dim myda As SqlDataAdapter
Dim ds As DataSet
[Code]....
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Mar 4, 2010
I have 2 tables: locations and depot:[code]I have 2 forms, frm1 and frm2. Frm1 has a combobox, cboLocations which pulls from the Locations table. Frm2 has textboxes which populate based upon the location selected from cboLocations on frm1. Frm2 also has a combobox, cboDepot, which pulls from the Depot table.So far, I've been able to get cboDepot to populate with the first depot_refnbr. This is not the corresponding depot_refnbr that matches with the selected Location; it is just the first depot_refnbr in the Depot table.I need to populate cboDepot's text property with the depot_name, and not the depot_refnbr that corresponds with the Location selected on frm1 from cboLocations.Frm1 has a button, and I'm not sure if I'd have to code this in the button click event, the cboLocation_Selected IndexChanged event, or in frm2's load event.
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Jul 27, 2010
I don't have the same problem when using an untyped dataset.
OK. I have a typed dataset MyDS with a typed datatable MyTable (TableID, Title, Message).
The table gets filled with results from two tables, using a UNION ALL
Select
TableAID,
TableATitle,
[Code]....
Is this how typed datasets handles UNION? I didn't want to create two typed datatables and create separate SQL for each and create a relation.
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Jan 21, 2011
I hoped you could give me som tips about speeding up som code i have to match an item to a collection of items... I have 1250 items that need to find the best match from 16774 items(every item is a class that consist of a string variable containing the path to an image, and 9 fields containg the most dominant color from a collection of 13 colors(the closest color)) The program does not use the filename or do any color matching in this step, only check the 9 fields... but it takes so
[Code]...
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Sep 14, 2011
I am trying to speed this calculation up because I need it to run every time a textbox or a checkbox is changed within the program. My issue is that it runs so slow that there is a lag between changing the text or checking a checkbox and the actual completed calculation.
Sub CalculateP1LoanAmount()
On Error Resume Next
'create the variables for the calculations
Dim P11stPV As Integer = 0
[CODE]...
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Jul 4, 2011
I Have the following:
[Code]...
"Warning: Variable 'PDU_messages' is used before it has been assigned a value. A null reference exception could result at runtime." and then on running, Object reference not set to an instance of an object.
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Mar 4, 2010
following issue I'm having:
I have 2 tables: locations and depot:
Locations:
site_refnbr (primary key)
site_name
depot_refnbr(foreign key)
[Code]...
I need to populate cboDepot's text property with the depot_name, and not the depot_refnbr that corresponds with the Location selected on frm1 from cboLocations.Frm1 has a button, and I'm not sure if I'd have to code this in the button click event, the cboLocation_Selected IndexChanged event, or in frm2's load event.
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Aug 15, 2011
I have a form which populates a TextBox I want to use the textBox.text to then load a gridView with the results
[code]...
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Apr 17, 2009
i'm trying to populate a simple combobox with a query to a MySql database. I Just want the combobox to show the results of the query:
SELET DISTINCT models from Cars
I am using VB 2008 with Datasets, how can I achieve this?
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Jun 14, 2011
I didn't think it fair to post a comment on Fredrik Mörk's answer in this 2 year old post, so I thought I'd just ask it as a new question instead..NB: This is not a critiscm of the answer in any way, I'm simply trying to understand this all before delving into memory management / the marshal class.
In that answer, the function GetByteArray allocates memory to each object within the given array, within a loop.Would the GetByteArray function on the aforementioned post have benefited at all from allocating memory for the total size of the provided array:
Dim arrayBufferPtr = Marshal.AllocHGlobal(Marshal.SizeOf(<arrayElement>) * <array>.Count)
I just wonder if allocating the memory, as shown in the answer, causes any kind of fragmentation? Assuming there may be fragmentation, would there be much of an impact to be concerned with? Would allocating the memory in the way I've shown force you to call IntPtr.ToInt## to obtain pointer offsets from the overall allocation pointer, and therefore force you to check the underlying architecture to ensure the correct method is used*1 or is there a better way? (ToInt32/ToInt64 depending on x86/64?)
*1 I read elsewhere that calling the wrong IntPtr.ToInt## will cause overflow exceptions. What I mean by that statement is would I use:
Dim anOffsetPtr As New IntPtr(arrayBufferPtr.ToInt## + (loopIndex * <arrayElementSize>))
I've read through a few articles on the VB.Net Marshal class and memory allocation; listed below, but if you know fo any other good articles I'm all ears![URL]..
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Aug 23, 2010
I have a database structure filled with data that I'm trying to write out to an XML file. Here's a taste of the way the VB code is structured:[code]I can't see or report any progress, because the processing is all tied to one giant LINQ query. Even if I can't make it any faster, I'd like to know how much longer I have to wait. My first version of this code had For loops instead of queries, so I could display progress, but it took a loot longer.Obviously I'd like to speed this up considerably. It seems like there should be a simpler way to convert the data to an XML file, especially since the database structure was created from the XSD in the first place.
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Jan 19, 2012
I've wrote this code to accomplish what the image below looks like. This works fine for anything that is around 40x40 but if I try to do 100x100 it takes forever and sometimes errors out with a window handle error. Once it gets around the 40th column the labels start adding slower and slower. Is there anything I can do to make this more efficient? I added the backgroundworker routine in there to see if it would speed things up at all but it doesn't.
vb.net
Private Sub CreateGrid(ByVal rows As Integer, ByVal ranges As Integer)
If Me.InvokeRequired Then
[code]....
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Feb 24, 2012
I'm trying to populate an array from a dataset with only specific column using vb.net 2010. is there any code to populate the array directly or must i make the use of a query?
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Aug 23, 2010
I am trying to populate an array from a listbox.My listbox items contain something like this:
1 for January
10 for February
3 for March
I have code in place and it was working, but I am taking the first character of the listbox item to populate the array. If the value of the listbox is 10 for February, I need to get 10, not just 1. Can I do something with the string that says I want to trim everything from the space to the end? Since they are all formatted the same way, if I could trim out anything from the space on, that would work.
Here's what I currently have:
ReDim m_adecRainfall(m_astrMonths.Length - 1)
For intCount = 0 To m_astrMonths.Length - 1
m_adecRainfall(intCount) = CDec(lstMontlyRainfall.Items(intStart).ToString.Su bstring(0, 1))
intStart += 1
Next
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Sep 29, 2009
I have 4 arrays and each array has the data of one column.
What I am trying to do, is to populate data from each array (or make one big array and populate to datagirdview) to datagridview.
the way i did is very basic way and it takes a long time (>5 sec) to populate the data to datagridview.
My approach is:
add 4 columns to datagridview
do
datagridview.item( iRow, 1).value = arrayOne(iRow, 1).value
[Code].....
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May 5, 2010
I want to modify this function to populate an array with each item in the database.
I have tried various options, but I just can't get it to work[code]...
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May 5, 2010
I want to modify this function to populate an array with each item in the database.
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Nov 9, 2010
The first problem I am having is that it populates every cell with the same random number. How do I get it to create a new random number? The second problem is that I need to make sure each entry in the array is unique.
[Code]...
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