Querying/Displaying Boolean Variables From MS Access?
Jan 14, 2011
I am querying the MS Access Database to display the results in a datagridview. This is my
Dim ConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=data.mdb"
Dim SQLString As String = "SELECT * FROM Groups where Selected = Yes"
Dim OleDBConn1 As System.Data.OleDb.OleDbConnection = New System.Data.OleDb.OleDbConnection(ConnString)
[code]....
The variable Selected from the query statement ("SELECT * FROM Groups where Selected = Yes") is a Boolean in the MS Access Database. However, this statement returns empty result even though most of the values for Selected are Yes. In the access database however, if I enter a 'Yes' for the value of Selected, it shows up as -1 and 'No' shows up as 0. So I even tried changing the query statement to ("SELECT * FROM Groups where Selected = -1") and also ("SELECT * FROM Groups where Selected = 'Yes'") but none of them work. Can you please help me fixing this query because I can't change the database?Also if I change the query statement to ("SELECT * FROM Groups"), then all the data shows in the datagridview, however, the values for Selected column do not display. Instead I see check boxes and I can't click them. How can I display the values correctly?
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Jan 16, 2012
I have 8 boolean variables and i need to be able to add an email to an email string for each boolean that is true. I dont't know how to do it without writing a million if statements. Here is some of what i have:
if bIsBlue then
strEmailTo = strSalesEmail
strEmailTo = strEmailTo & ", " & varBlueGrp
End if
[Code].....
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Mar 23, 2009
This is in VB6 (may also apply to VB.net) CheckBoxes can have three states (Checked, Unchecked, Greyed).
But I'm using them to set boolean variables (MuteSound, etc.) This is definitely a value that has only two states. Unfortunately, the Checked and Unchecked don't correspond to a True/False value.
So, I can't have:
[Code]...
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Jun 16, 2011
I am working with a multi form project. The long and short of it is that when i originally load form 1 ... all bool variables are false. Once i load form 2 and perform my operations some of my bool variables will be set to true.
I need to have some sort of object to listen for those changes. What i have come up with so far is the following. Private Sub patient_frm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]...
The if statement will work but i need a way to make it keep looking for changes in the boolean variables.
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Sep 5, 2010
I am trying to make a list, separated by a comma, of entries from a single column in a SQL database. I have been spending the last several days searching for a way to do this, but every thing I found either didn't work, or wasn't exactly what I was looking for.
The query will pull all the email address that are not null. What I need to know is how to take the result of that query and make it look like this:
email0@address.com, email1@address.com, email2@address.com, etc, etc, ...
I feel like I should know this, but for the life of me, I can't remember nor can I find it in any of the textbooks I have.
I am using Visual Basic 2010 and SQL Server 2005. I also have access to Visual Basic 2005 if needed.
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Mar 15, 2012
Basically for normal select queries from my database I have no problems as I would put the following and then bind it to a controller to display the iteam, however now I am trying to query sum of a field from the database, but I think it should be different as It's giving a Nullable value:
SELECT SUM(PointsRedeemed) AS tAward
FROM [Transaction]
WHERE (BusinessId = ?) AND (CardNo = ?)
[Code]....
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Jan 17, 2011
the remaining code for my vb.net project? In my Project, I have a table name tblBatch that has a field name btchGravel. Since in my project, a field name gravel has more than 10 inputs from the 10 textboxes in my main form. I manage to save it in this manner:
'Save the textboxes in a single string, separated by comma
Dim GravelLine As String
GravelLine = txt1G.Text & "," & txt2G.Text & "," & txt3G.Text _
[code]......
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Jun 13, 2012
querying a remote Access database! We are currently using this because thus far we have failed at hooking up a sp_linkedserver. I feel like it's a terrible hack and want to be done with this whole network mapping business once and for all!
[Code]...
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Jun 16, 2010
I'm trying to open a connection and create an SQL statement with two different tables in different Access DBs. Is this possible? I'd like to join the tables in a query.
Is there a great advantage in splitting somewhat large Access databases? Or is it best to just create a large access database with many tables?
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Apr 23, 2009
I am trying to autocomplete a Textbox using the AutoComplete Extender. My Web Service is as Follows:
Code:
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
[Code].....
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Feb 15, 2010
I'm looking for the most efficient way to query an Access table from VB.Net. I think throughout the life of a run I'm going to need to query the table ~1,000,000 times. I'm using Access 2003 to hold my data. What I've been doing so far is this:
[Code]...
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Aug 19, 2009
I have an access database with a table called [yearly stats cape town] This table has the following relevant columns to my query. [CASE NO], [B/W/C] [1ST APP MAG CRT].The goal of the windows form I am doing is to return the total number of unique case where [B/W/C] = C (in custody) and [1ST APP MAG CRT] contains a date longer than 6 months ago from the current system date. To determine the total amount of cases I use the following query.
SELECT COUNT(*) AS [CASE NO]
FROM (SELECT DISTINCT [CASE NO] AS [CASE NO 2]
FROM [YEARLY STATS CAPE TOWN]) derivedtbl_1
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Jun 30, 2011
I am trying to search for the occurence of a string within MS Access database with 1000000 records using VB.Net. The program does not respond once it is run or it is taking a very long time. However, if I reduce the size of the database the program runs.[code]...
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Nov 17, 2009
I am sending a write command "*IDN?", and then trying to read back the information and put that into a text box inside of VB6. The "*IDN?" command gives back some information about the piece of equipment. When I send this command and read back using the NI488.2 interactive control utility I see the correct information displayed. I am not sure what I am missing in my VB code. My gui only consists of a text box to display the information read, and a command button to start the sequence. Here is my code.
[Code]....
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Oct 29, 2009
I need to send up to to selected images (such as an apple) to pictureboxe's on a results page. at the moment I'm using global variables to attempt to display the images like this:
Me.pbItem1.Image = New Bitmap("images\" & gstItem1 & ".jpg")
Me.pbItem2.Image = New Bitmap("images\" & gstItem2 & ".jpg")
I get a directorynotfoundexception 'Could not find a part of the path '\images\apple.jpg' error. I'm new to VB and think this must have something to do with the default path or something.
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Mar 25, 2011
CheckBox1.Checked = DataGridView2.CurrentRow.Cells(10).Value
CheckBox2.Checked = DataGridView2.CurrentRow.Cells(11).Value
CheckBox3.Checked = DataGridView2.CurrentRow.Cells(12).Value
CheckBox4.Checked = DataGridView2.CurrentRow.Cells(13).Value
CheckBox5.Checked = DataGridView2.CurrentRow.Cells(14).Value
how to set this code at boolean in access 1 and 0..
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Feb 6, 2010
how to store boolean values in ms access or sql server
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Nov 17, 2009
From what I read it is a good convention to name a method that returns a boolean value with the prefix of "is" or "has". So in keeping with this convention I am trying to name a method in my program with this prefix but I am running Specifically I have a class called Day. It is a simple class with a few data members and one method that returns a boolean value of true or false. The name of the boolean variable is isSpecialDay. This class has a method called isSpecialDay which takes the date of the day, applies some criteria to the date and then sets the variable isSpecialDay to true or false. My problem is that the boolean variable is named isSpecialDay and so it the method. What should I do?
Public Class Day
Private TheDate as String
Private DayName as String
[code].....
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Sep 18, 2009
I need a good book for beginning to use VB 2008. I have some (limited) experience in using VBA. I want to access a database (SQL) and have access to the data set as variables?
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Oct 27, 2011
After Filling a DataTable in GridView's DataSource . A column with check box Type appears but it created as read only column and I can't enable it or make it editable... even i tried .readonly = false and still can't be edited
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Apr 15, 2009
I tried to show the rows of the table I created. First I added a bindingsource object and selected my database and table. Then I added a textbox and set databinding>text to the item i wanted in the table. In the begining it worked but then it suddenly stopped working and even though I built the program again from scratch it no longer works.
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Feb 11, 2010
I used the following code for retrieving a column items from access table and displaying it by using list view and it work perfectly, the problem now is that I need to add another column items to the list view ... but how? I displayed the two columns with their headers but the problem is retrieving the items for the second column.
This is the code that I used for the first column:
ListView1.Items.Clear()
Dim comm As New OleDb.OleDbCommand("select * from TEACHER", cnn)
Try
cnn.Open()
Dim datareader As OleDb.OleDbDataReader
[Code] .....
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Mar 31, 2009
It's apparent I have no idea what I am doing anymore, therefore I'm turning to experts. I would like to 2 things.
1) Make an ODBC connection to our datasource and display it in a Datagrid (table)
2) Make an ODBC connection to a DataSource and Copy several tables to an MDB file. Basically the same thing I accomplish by using the Import Function in Access. Just automated and with some additional items.[code]
In trying to answer the first part of my 2 part question, this is as far as I get. I can't seem to loop through the ODBC connection and assign it to a Datagrid.I usually get an Transoft Error about the Query - or more often I receive ERROR [IM001][Microsoft][ODBC Driver Manager] Driver does not support this function.[code]
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Sep 15, 2010
I'm trying to use variables created within a loop, but I'm not sure how to do this. I've searched around on the net and there is a few recommendations to try and put what I require into a function then just call the function.
[Code]...
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Feb 1, 2012
Basically I just want to use
tile1.backcolor = colors.while (just an example)
however tile1 is only created WHEN the form loads, and it will not let me compile it becuase it's saying it doesn't exist
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Dec 14, 2011
Public Sub drawChart()
Dim panel As Graphics = picBox.CreateGraphics
Dim myTextBrush As SolidBrush = New SolidBrush(Color.Black)
[code].....
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Jun 6, 2011
displaying columns from my ms access table to a listview in vb.net..i use oledb in connecting to ms access..
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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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Aug 29, 2011
I have inherited a database from somebody who has passed away & I have been asked to look after it.The data is in an mde file which i can use vb to display records i need to report on.In the database is a field for dob which is date/time structureThe date in the database is 23/jan/1874If I display Rs("BirthDate").value i get 23/01/74If I say Dim Bdate as date="#" & Rs("BirthDate"),value & "#" & display Bdate, I get the same
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Jul 23, 2009
I am making a small application in which i have added a class module and a window forms in vb.net. i want to acess the shared variables and mathods of class without making any object.
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