[2008] Count The Database Results?
Jan 31, 2009
I am using a mysql database and I am trying to get the number of results. I should only have 1 result because this is for a username/password login. I tried this
If loginReader.HasRows Then
'do whatever here
Else
'do something else here
End If
The loginReader gets the results and does the ExecuteReader. The problem with this is that if I use a good username and password it works but if I put in a bad username and password it doesnt do either one of them. Any ideas on how to just count the number of results?
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Oct 4, 2011
In my datatable I have a single column containing a series of integer values. eg:-
1
2
3
1
2
2
2, etc
I am looking to do an equivalent of the following SQL statement :-
Select Value, Count(Value) as Total
From DataTable
Group By Value
Order by Value ASC
I'm looking to return the following from the above example :-
Value Total
1 2
2 4
3 1
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Mar 8, 2010
I am currently building a search page, which includes a textbox and two drop-down lists, a search button, and a datagrid. If results are found and displayed, I would like a label to display:
(e.g.) "24 results found for 'blue sky clouds' "
...where the integer represents the results count, and the keywords and/or drop-down list selections are included in the string.If no results are found I would like the label to display:(e.g.) "No results were found that match your selection. Please try again"I would also like the label to be invisible until a search occurs.
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Jun 2, 2010
I have code that's working beautifully on my development machine, but when deployed to the server is throwing null reference exception. So, I can't step through the code, but I've pinned down the culprit. But now I am puzzled.[code]In the code above persons is a dictionary of custom class, and certs is of IEnumerable type. Now here's the quandary.. The first line that sets the label returns False, so certs is not null. But the second line throws an null reference exception.
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Apr 18, 2012
I'm trying to write a function which obtains the sequence_number by counting the records in a table that fit a particular criteria and if the result is 0 or nothing sets a variable to 1 but if the result is 1 for instance, the variable will be set to 1 + 1.
This is the code i'm using but i'm not getting the correct result when results are actually returned. For instance, if the result of count is 1, i want "seq" to equal 1 and total (which represents the sequence # assigned to the next record which is entered with the same plan and date) would therefore be 2 which is the result of seq + 1 (i.e. 1 + 1)
[Code]...
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Apr 9, 2010
I want to count the amount of records in my table where the distance column is greater or equal to the passed integer.I have:
Dim TenMilesCount = GetDistanceCount("10")
Public Function GetDistanceCount(ByVal Miles As Integer) As Integer
statcon = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:My
[code]....
Yet running the code gives me "An error occurred creating the form. See Exception.InnerException for details. The error is: No value given for one or more required parameters."
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Sep 25, 2009
I had done this by using the query builder (in VS Studio) but soon found out thay I gain no points by doing it this way as I am not using any code. I have tried to adapt the code I had to insert data into my database, just changing the SQL sintaxa and some other bits, but it is not working yet. Well, it gives results, but I think it is still geting the results from the query I had built using the query builder. Here is the code I've got so far:
Public Class Form2
Private Sub btn_search_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_search.Click
Dim str_search As String = txt_search.Text
Dim str_dob As String = txt_dob.Text
[code]....
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May 17, 2012
How can I count Total of column from datagridview and show results in textbox Using VB 2005!
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Dec 30, 2010
I want to search a sql server database from VB.Net and output the results in a Listview. I don't want to use code that involes queries in it, but the queries are to be used in the data set designer, i.e the query builder.Here's what I got so far.
I created a query in the builder called SearchStudent
SELECT FirstName, Surname, Email, PredictedGrade, Notes
FROM tblStudent
WHERE (FirstName LIKE @FirstName) OR
(Surname LIKE @Surname)
Here's the code to search the database and fill the dataset
[Code]...
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Apr 5, 2010
How can i declare a simple variable in a form that is the count of the amount of times a field appears in a database.Basically i want to count the amount of times the word "Saloon" appears in a column in my database (access 2007) and then assign that value to a variable.
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Jan 31, 2009
I have data entries in my database that have a common field. For example:
account_id type user_id
1 new 1
2 old 3
3 new 1
4 old 1
I am using a query like this(mysql): SELECT account_id, type, user_id FROM table WHERE user_id = 1
This is just all theoretical. The problem that I am having with this is it is only returning the first result in this case account_id 1. How can I get it to find all the results with the user_id 1 because in the way I am thinking that it is failing is that it is finding only the first result and then ending?
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Jan 19, 2011
im just starting to work with some database stuff, and ive got data binding done but im a little stuck with filtering. Ive got a test project, which has
-- listbox (bound to column 2/firstname)
-- Combo box (Has items added, with the same names as the items in colunm 3. so it has 'RPG' and 'Puzzle')
Now what im trying to do is when the item in the combobox is changed say to 'RPG' only items in the db which have 'RPG' in the surname column are displayed in the listbox. Been Google'ing and reading but all i can find is examples relating to a dataview and i cant get them to work/adapt to my situation.
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Feb 13, 2010
I want to search my access database and count the number of records in the column "Type" in each group. For example
[Code]....
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Apr 16, 2009
[Code]...
I need to happen is for whatever is typed in the txtStockBookID text box to be searched in the 'BookID' field in the database (dbStratagem) and for all relevant records to be produced in the datagrid (grdStockResult). The code used above has so far safely connected and displayed the entire table (dbStock) in the datagrid but I am not able to restrict the results to only criteria searched.
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May 21, 2009
I am using a WCF to connect to my database. I have the code below, I am trying to select all the details from the database where the customernumber = what the user has entered on the form.However, I cannot return a dataset to the form as it sends in a string.
Imports System.ServiceModel
Imports System.Data
Imports System.Data.OleDb
[code].....
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Jul 22, 2011
I would like to create a vb form with a combo box (with song title), a text box (for song lyrics), and a button (to submit or refresh). It is linked with an access database. The combo box is populated with the songTitle field in the db (this part works fine). The text box is populated with the lyrics that go to that song The first updates fine but I can not figure out how to run a query to pass to the text box's text property. I want the user to be able to select a song from the combo box, click the button, and have the text box populated with the new song's lyrics.
Any suggestions on how to accomplish this, or a good place for a tutorial that explains the necessary elements for having vb query a database and return the results?
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Jan 11, 2011
I have the code below which does work, but I need to add further functionality to it. The functionality I want to add to it is the text I have commented in the code below.
Dim objSQLConnection As SqlConnection
Dim objSQLCommand As SqlCommand
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code]....
Before the if statement, I want to find out if the database already has records with the username in the strUser variable.
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Jan 14, 2011
Is the following code using good practices? All I want to do is get a count of the number of rows which any given user has:
objSQLCommand = New SqlCommand("select count(id) as record_count from table1 where user = @strUser", objSQLConnection)
objSQLCommand.Parameters.Add("@strUser", SqlDbType.VarChar, 3).Value = strUser
objSQLCommand.Connection.Open()
objSQLDataReader = objSQLCommand.ExecuteReader()
objSQLDataReader.Read()
[Code]...
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Sep 17, 2009
How can I count fields in database (Any alternatives welcome)
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Jan 31, 2012
I have this database table called people[code]...
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Mar 8, 2011
I am currently attempting to write a program that will take a SQL query saved as a .sql or .txt and execute it against a specified database, and output the results to file. I have seen some sample code of executing a SQL query line by line,
and writing individual results to file.
The query that needs to be run is only reading information from multiple tables, but is pretty lengthy to do line by line. Is it possible to execute or read the whole query from the .sql file, or a text file, and run it against a specified database, and
have the results of the query output to file in vb.net?
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Mar 30, 2009
I have a problem which I have tried to solve in several ways, and by searching the Internet for various terms, searching through books and Visual Basic instructional videos, but none have yielded the correct results. My goal is as follows:
1. Create a Database listing job names, job numbers, and a link to the file about the job.
2. Create a form with 2 text boxes, a search button, a box to display results, and a preview panel.
The two above steps have been completed. The following is where I get stuck
3. I want to search for either the job name, and/or the job number, have VB search through the database and return the results in the results box.
4. On clicking on one of the results in the result box, the preview panel will show a preview of the file.
Notes:
i) The files being linked top are Microsoft Excel files.
ii) The box I have used for the results currently is a listbox, though I've no idea if this is the correct choice for what I want to do.
iii) The database I created is an *.xml database created in Visual Basic. I am a fair beginner to VB, learning as I go, but I'm stumped as to how to achieve this so any pointers on how to achieve points 3 or 4
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Dec 2, 2010
HI would like to count all the records in my query below and output the results to a text box. [code]...
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Mar 6, 2012
In one of my school assignments I am trying to count fields (that are strings) in a database and then publish them to the screen, however I can't seem to figure out how to count them.I've been trying to do something like this but I am having trouble with the bold part. I think the datatypes are the issue but if not this then what? What is a better way to try and do this?
Private Sub btnCalc_Click(sender As System.Object, e As System.EventArgs) Handles btnCalc.Click
Dim numRep As Integer
Dim numDem As Integer
[code]....
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Mar 13, 2009
I am making a project in VB 2008 that has a Form (form1) that allows me to add new records to a database, and another Form (form2) that allows me to search for records in a database. I have done Form1 already, but my problem arrives in Form2 where I have to query the database. This form consists of 1 textbox (txt_search.text), 1 button (btn_search) and 1 datagridview (datagridview1). The name of my database is db_extras_test2003.mdb and the table I want to search records from is tbl_contacts.
I know +/- the SQL sintax to query the database (SELECT * FROM tablename WHERE columnname = (here i dont know if i put the variable name i have set for the txtbox, or the textbox itself)).I want this in a way that I (or other users) type in the textbox, hit the Search button and the results are shown in the datagridview (i can show the results in another way if it is better to do so).I have done the connection to the database already. The code I have so far is the following, but it doesnt work
[Code]...
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Mar 12, 2012
Firstly I've searched the forums and cant find anything on this how to access an email account, then read unread emails received and then write the email body into a database.
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May 23, 2011
I have created a small program that performs various calculations with data entered by the user. I need to be able to save the entered values and the results on the system running the program and be able to open it at anytime in the future and have the values and results displayed in the correct text boxes. I am currently reading up on some tutorials but I was just curious as to how I can send all my data in Visual Basic to my database in Microsoft Access?
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Nov 15, 2009
I have a little problem with interacting with sql server from vb.net. I look here [URL]. I made an sql server table called Per: Until here all it's ok. What I want to do is to insert in the two textboxes the user types Mike (in textbox1) and Bottomley (in textbox2) ,press the button search and stored the results in listview if he finds the row (and in this case it finds).
Here is the printscreen of my windows forms application vb.net (I am using visual studio 2008. So I type in the two textboxes Mike(textbox1), Bottomley(textbox2) press the button and it searches in my sql server table (if it finds -in this case I have this rows it's row1) it displays me the result in the Listview.
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Nov 4, 2010
How can I increment the count in database while click on the button in vb.net??
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May 3, 2012
There are 3 textboxes->textbox1,textbox2,textbox3 and 1 button.In textbox1 bname will be stored and in textbox2 aname is stored.Bname and aname are columns of databasetable.This are not unique.There are same bnames and anames records.What I am trying to do is:when the user clicks on button then the code should match textbox1 and textbox2 with the databasetable and get the count of rows that match this data.
And print the count in the textbox3.If there is no similar bname and aname in the table then the count should show 0.I tried doing this but am pretty sure that its not right as its not working.
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