.net - Custom DataTable Searches?
Apr 14, 2009
EDIT: Note. I should have mentioned I'm not interested in using the .Select, DataRowView, RowFind, I wrote a function to search a datatable for terms in an array. I then return the datatable as a dataset so it can be bound to a DataGridView. Does anyone have any optimization ideas? Since this is a real-time search (every term typed instantly searches) I'd like to make the function as fast as possible. The speed is actually pretty good already but I figured I'd be worth asking you all if there was anything else I could change about it.
[Code]...
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Aug 25, 2011
Our shop primarily use "ADO objects" (I'm referring to DataSet, DataTable, and DataRow) for marshaling around data and manipulating it on forms and in grids. We are experimenting with creating shop-flavored counterparts to the native ADO objects so that we can impose our in-house standards on top of them. Implementing this is straightforward with one exception: I want our objects to be bindable to controls.
I'm aware of IList, IBindingList, BindingSource, etc. and have looked at and experimented with these, but I am falling short when it comes to making a class with no hard property names bindable. The native ADO objects are not strongly typed by default. You have column values that you access via the Item property (e.g. row("Age") or row.Item("Age")). The binding examples I've found online deal with strong-typed objects (e.g. row.Age). Essentially, we want to create custom ADO objects (not inherited from the native ones) that still retain their ability to bind to controls. In a grid I would expect to see columns Name, Age and Occupation from a row where these properties are exposed via row("Name"), row("Age") and row("Occupation"). This must be doable as this is exactly what the native DataTable and DataRow provide.
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Dec 17, 2009
VB.Net 2005 SQL server 2005
I have a project I have a dataset that contains tables In the dataset designer, each table has a defaiult FILL command set. I have draged and droped my table as a grid onto my form VB automatically sets up the table adapter, and binding source to make it all work.
in my code, is placed in the form load routine, a tableadapter.fill(dataset.datatable)
Here is my dilemma. The data in my table may have 100's of thousands or rows.
I have presented the user with a front end that allows for filterring and selecting based on several columns. reguardless of how many rows the result set contains, there will always be the same columns in the dataset.
Because there are so many combinations of select query, i do not want to make 20 or 30 custom fillby's in the dataset. I want to make an addhoc select query and have the binding source and table adapters work as expected. I have created a query called "FillByCustom" in the dataset designer attached to the DataTable Adapter section.
My question is this.
If i build a select query that returns the desired rows, how do i place it into the adapter in place of the FILLBYCUSTOM select command, such that it all works as expected?
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Jul 8, 2009
Am in the process of architecting a new windows forms application, and I intend to use Visual Basic 2008 and SQL Server Express 2005. This is my first application in .Net and I really want to observe the best OOD & OOP principles to create an application that is easy to maintain and extend (add new functionality). My issue is in regard to databinding on the UI. From experience, what do you guys recommend to use for databinding? Should I return datasets/datatables from my Business Layer and bind these to UI controls or should I return Business Objects and bind these to UI controls? And what are the pros and cons of each approach?
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Feb 16, 2012
I 'd like to enable the user to apply a custom filter to a System.Data.DataTable.At the moment I have a very simple function like this:
Dim result = dataTable.Select(txtUserInput.Text)
With the filtered results I'd like to do further operations(e.g. Database Update/Delete).Is an sql injection protection needed or is the "Select" function secure?
//Edit:Can the "select" function be abused to manipulate any data in the datatable, execute code, ...? If the only danger is that this function can return to much/to less data there is no problem. But if the data in the dataset gets corrupted it's a real problem.
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Mar 21, 2010
I've got a working code that searches the a textbox, but! what it does is search for example lets say I have a richtextbox and it contains the string Hello Hello when I search for hel it will only highlight hel I want it to highlight the entire wo
Dim search As String = ""
Dim myIndexes As New List(Of Integer)
Dim myLen As Integer = 0
[code].....
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Apr 23, 2009
ive been reading this forums and it already helped me a lot with my application, im new to visual studio and im currently developing an aplication for my school project in vs 2008.Im using a simple access database with only 2 tables and I creadted a form with a datagrid to show all data inside the tables, and now i want to create search buttons for each field of the table . like, "seach by Name", Seach by date" etc... i tried to use the simple code
Code:
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim cod As String
cod = InputBox("Type the Id to search: ", "Search By ID")
If cod <> " " Then
[code].....
My biggest problem now is that this code works very well to search by id (which is my table primary key), but now i want to search by other fields and this code only allows to search by primary key! Is there any way to use something similar to this code to search by other fields?
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May 1, 2010
This code searches your system and displays ever file that it found in to a listbox. The problem is that it always gets stuck at one file called C:windowsvery long name but ends with runtime.exe how can i add a skip function so that if does get stuck it will just skip that file.It always says "The device is not ready."can you fix this bug.I have been fighting with this for 3:28 hours
[Code]...
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May 8, 2009
I am trying to return a filename without the extention, to keep things simple, lets just say I want it to go to a MsgBox.[code]The only thing I am getting is a * in the msgbox. I though that strings supported wildcards?
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Jan 17, 2011
I am very new to VB.net and for a project I am supposed to do some "outside research" and create a database. The database should consist of items (sports players) who have a number of different values (one set is physical: strength, speed, agility, acceleration) and preferably another (technical ability: ball skill, dribbling, shooting, etc). I want the database to classify these and give each traits such as "Power Shooter" if the shooting stat is upwards of 90, etc. I want to be able to bring up characters through this and also through named searches.
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Apr 23, 2009
Im using a simple access database with only 2 tables and I creadted a form with a datagrid to show all data inside the tables, and now i want to create search buttons for each field of the table . like, "seach by Name", Seach by date" etc... i tried to use the simple code
Code:
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim cod As String
cod = InputBox("Type the Id to search: ", "Search By ID")
If cod <> " " Then
[code]....
My biggest problem now is that this code works very well to search by id (which is my table primary key), but now i want to search by other fields and this code only allows to search by primary key! Is there any way to use something similar to this code to search by other fields?
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Dec 14, 2011
The help in visual basic express 2010 directs me to the web,My searches often pick up info on C pgms and VB 6 etc.I have been adding VB 2010 to each of my searches.e.g. Format vb 2010.How do others search for relevant info in these web searches.
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Feb 13, 2009
i want to make a programme that search for file then delete it but i dont know what is the code of search
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Aug 25, 2009
I'm creating a search control where searches can be compounded. So, for instance, I could create a search for Orders where OrderID = 1232 or OrderID = 2343 and OrderID <> 23435
So I have a button that users can click to compound. Obviously its a complicated problem to do well, but in any case, on my path to trying to find the best way to do it, I wanted to create a variable that could be either '=' or '<>' depending on the value of some other variable set elsewhere.Is there a way to do that? Or do I have to switch to Expressions?
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Mar 19, 2009
I have searched the forums and although i get hits on my searches no matches have answered my quandary. I am using visual studio 2008
So to the question: I have 10 label's named label1, label2 label3 etc. and i have a dataset with 2 fields and 10 rows (2x10) i would like to create a for loop like the following:
for x = 1 to 10
label(x) = ds.row(x).field(0)
next
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Mar 24, 2010
could someone help me with some simple coding methodology for doing database searches within the ExecuteReader function that will return results regardless of case?For example, if the variable to search for within the database is John Smith,I would want the search to be successful if john smith is the user-provided variable.
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May 1, 2011
I have 10 lines of array that are first name space last name space zip code. All the zip codes start with different numbers. Is there a way to replace the #1 in the indexof below so that it searches for any number character instead?
'open file
inFile = IO.File.OpenText("Names.txt")
'process the loop instruct until end of file
intSubscript = 0
[code].....
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Jul 8, 2010
I'm writing a script that's designed to search an entire file, and respond with found if he found a match. However, he only seems to search the first line for matches. here's the
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If FindStringInFile("C:Usersdanl.FATLANDDocumentsvare.txt", TextBox1.Text) Then
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Dec 8, 2011
I'm new to VB and my book doesn't explain sequential searches very well. I need help with the application I'm creating for school. My application has to allow the user to enter a number and then it will verify if the number is valid by searching through the list of arrays I provided.The question:Create an application that allows the user to enter a charge account number. The application should determine whether the number is valid by comparing it to the numbers in the following list: (see code)The list of numbers should be stored in an array. A sequential search should be used to locate the number entered by the user. If the user enters a number that is in the array, the program should display a message indicating the number is valid. If the user enters a number that is not in the array , the program should display a message indicating the number is invalid.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Account(0 To 17) As Integer
[code].....
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Apr 1, 2011
so my program takes what the user enters into a textbox and searches through the data i have stored and if it matchs one of the peices of data it displays the apropriate data to the user. This all worked fine till i changed the textboxes to be added dynamicly to the form when it is load and i put all textboxes in a collection. So now when the text is sent to the search sub it sends the data over but always returns that it didnt find a match. But if i go into the search sub and just tell it what to search for automaticly it finds it no problem.
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Nov 1, 2009
I was wondering how I could make an application that searches a certain website for a specific string. Or, if I could, list the search results in a listbox. Reason for: I wan't to make an application that searches serial websites for certain serials. Like 'Craagle'.
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May 26, 2012
there is a database, containing a table with personnel. in the personnel table there are names and ID'sthere is a second table departemens, containing the names of departements and their ID's.in the third table it says which departement ID and which personnel ID are to be linked,
example
the employee called ruben has an ID 5
the employee called kevin has an ID 10
[code].....
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Jan 22, 2012
In VB6 I could use an asterisk as a wildcard when searching the object browser. For instance, searching on "c*Report" would find "cFooReport" and "cReport". I can't seem to do the same in VS2008, am I just missing something obvious?
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Sep 29, 2010
im creating an array that contains something like this [code]Then i need to make it so when i click on a listview item it searches for the same "Application" name and shows the path.I have everything planned out, but im not sure what i should use to do this.Should i use list(Of string), arraylist or just string(,)?I have no idea of the amount of elements it will contain. I was thinking of using a list so i can use .find without having to make a search function.Anyways, what would be the best/fastest way to do this? Its possible i might have up to 1000 rows in this array, so i want something fastish.
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Jan 4, 2012
I am creating a class that searches a binary file for a specific customer number. I am using a binary search that keeps on slicing the file in half until I find the customer number while is sorted. Once it finds it I am positioning it at the first instance of that Customer number as there can be multiple records with the same Cus Number.
Now here is my question. I now need to loop through this Customers records and do some data base searches. Since I want to make my class as generic as possible what should I pass back to the calling class? An Array with all their records. If I do this I have to loop twice, once in the class and once when it passes the array bac to the original calling class?
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Apr 13, 2009
I am creating a search function which searches a database for keywords in a selected field in FilmTable (name of table to be searched)
This is the SQL I am using:
CODE:
It is saying there is an error in the FROM syntax
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Feb 9, 2011
I have a windows form which to summarize lets the user open a file containing 32 bit hashes, then search for one of them. The hash is then converted to its string representation. The application is giving the results I would expect but I'd like to make it execute faster than it does now; some files can be pretty big > 100 MB.
I'm doing the file read using a BackgroundWorker object to display progress updates and ensure that the UI is available during the process. But for that i need to add a System.Threading.Sleep(1) instruction in the loop; otherwise the application freezes with big files. And System.Threading.Sleep(1) creates a noticeable lag. Any suggestions on how to make searches fast without freezing the UI? Getting speeds comparable to hex editor programs for example.
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May 28, 2009
I need some guidance on the best way to proceed with searching a file content. I have a large file (see attachment) that is in text form, some of these files could be upto 50 times as big, therefore creating a huge file. These files contain information that is produced from another application and therefore I am unable to change the format of the file.
[Code]...
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Aug 18, 2011
I am trying to display value of the field ("UserID") for every row exists in datatable to checkboxlist(make the checkboxlist item selected).
I used for loop, but only the field value from last row of RoleUsers table is selected in the checkboxlist.
Here is my code
Private Sub DisplayRoleUser()
Dim conn As SqlConnection
Dim cmd As SqlCommand
[Code].....
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Mar 15, 2010
I have a datatable and I apply a filter to the defaultview.rowfilter property of that datatable. If I then loop through the rows collection of the datatable, will I only be able to see those rows that the filter applies to, or will it loop through all the rows?
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