Blank Fields In Database
Aug 25, 2008
I am working on a timekeeping application, using Visual Basic 2008 Express edition with an Access 2000 database.The application requires the user to complete a timesheet by recording in tme and out time daily. Blank fields are perfectly frquent and perfectly legitimate.Using these lines of code it works perfectlywhen there is a time value in the database.[code]This indicates to me that the code to ignore a field containing nothing is not working
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Apr 11, 2012
I have a from with a datagrid, binding navigator, and textboxes, nothing too fancy. This project is for a database management program. I am trying to have a messagebox show up if certain fields are left blank such as
If Ordertxt.Text = Nothing Then
MessageBox.Show("Test") ' This is just for a test
If CustomerTxt.Text = Nothing Then
CustomerLblERR.Visible = True
If Order_StatusComboBox.Text = Nothing Then
orderstatusERRLbl.Visible = True
[Code] .....
But no matter where I put a message box,(on cancel button, on random button on binding navigator) it closes down the form and goes back to the main form. As far as I know it is the only form this happens on.
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Jan 1, 2010
When i parse some html and get the fields i need using regex, the first 4 fields returned are fields i don't need, so essentially i need all fields returned after the 4th one.
vb.net '// First piece of data we want...
Dim stringID As New Regex("(?<=><optionvalue="").*?(?="">)", _
RegexOptions.IgnoreCase Or RegexOptions.Singleline)
Dim stringsMatched As MatchCollection = stringID.Matches(stringClean)
[CODE]...
Is there a way i can blank out the first 4 fields returned?
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Apr 2, 2010
I am trying to pull sql data into a text file. The code works just fine, until some new data comes in from lazy employees and a couple fields (used for notes/comments) are now left blank. Originally I've never seen them blank so I didn't think anything of it.
col2 = myreader.GetString(1)
It will error if the field is ever null - I even tried using a case when:
case when note is null then '" & empty & "' else note end and set the variable emtpy = '', but vb still thinks that it's null and errors?
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Apr 8, 2012
I have a table which contains a list of products for a company. They input data about how much stock they have and also the level at which they want to be reminded that they need to order new stock.
[Code]...
I want to list all the true results in a form which the user is then able to navigate through. What would be the best way to go about doing this?
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May 11, 2011
I have a few date fields on a form. no matter what i've tried in the properties, the form still loads and there is a default date in there, how do you get rid of this?
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Nov 7, 2009
[code]....I have a dialog that comes up and asks for a reason for declining the business.I don't want the code to move on after not enabling the "me" until the reason has been entered and saved into the database. Also, at that point where it says "I WANT...." I want to copy the textbox fields into a new database and then delete this entry from the database, how can I do that. I am using VS 2008 and SQL.
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Feb 21, 2011
I am not sure about method to publish my program. But basically when I publish it no errors at all...I have database name usurfdb.mdb. I have set it build action to content and copy to outputdirectory = copy if newer.Should I amend anything on my usurfdbdataset1.xsd as well like I did on my .mdb?
Dim con As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|u-surfdb.mdb;")
I am wondering, When I try to locate the location of my database after the program
I have 2 inputs from 0-180 for x and y i need to add them together and stay in the range of 180 and 0 i am having some trouble since 90 is the mid point i cant seem to keep my data in that range im doing this in vb.net
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Jun 11, 2009
i have a combobox which get value from database through dataset. when i run the program n click on the combobox, the value is auto fill in with data from database. is there anyway to add a blank entries to the selection on the combobox??
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Aug 13, 2011
I want to add a blank value to a field in access database with vb 2008 command.
Problem 1: Here is my code, it shows conversion to string not possible errors
Private Sub btnRedThrow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRedThrow.Click
Dim dbCnct As New DBUtills
[Code]....
notice the fifth and last value is empty. But it is not being added into the database, how do I do that?
Problem 2: Why does an additional field from my access database disappear even after I manually created the field?? (access database 2003 version, extension is .mdb) I'm using visual studio 2008
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Apr 7, 2011
I have problem insert records from my vb application to my access .mdb dataabse with all columns set as not allow zero length string and when I insert a records in which one of the column is null value it show allow zero length string error any idea how to create a code in visual basic in which allow zero length without change the configuration of the database?
For example my record have job_no name station 1 des 2 albert so I need to pass job number 1 to my access database but came out with error zero length string off course my access database is set no all to do so but I have my reason is that any sample code to force to accept blank strings?
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May 16, 2009
I have searched all over the forums and not found an answer to my question. My question is how do i write to an access database at runtime. The database is also created at runtime. I have a dataset loaded with a table that i needs to be written to the database. how would i write each row of my dataset to my database? Sorry if this sounds a little jumbled together it is late and i am tired. If it is unclear you can ask me and i will answer any questions you have about my question.
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Sep 17, 2009
How can I count fields in database (Any alternatives welcome)
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Aug 15, 2011
i am making a project and in that getting storing and loop problems there are two fields serial no and quantity when quantity is entered serial number must be asked then only and the number of times quantity is entered that many times serial number must be asked also serial number is from to too like 1 to 6 or 1 to 5 so i have to taken 2 textboxes serialfrm and serialto to store but now the problem is that i am not able to write proper code for it either it doesn't get saved to the particular name to which both fields belong or it keeps saving without stopping.
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Jun 20, 2011
i have a table named item_details.i have some field named item_id,item_name,quantity,supplier_name etc.i want to see all details as per the item_id given in a textbox.i also want to see details as per the item_name is given.i can use 2 forms to view this type of query..one for item_id..and other to view from item_name.but..i want to use tabcontrol..in 1 tab i want go give the item_name...and want to get the details.and other tab i want to give the item_id...and want to get the details....and whenever i gave wrong information.an error message will be shown.
[Code]...
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Feb 17, 2010
This will actually be for a WPF app but how do I filter the fields of a SFD database so that I can use expanders with listboxes that contains last names from the DB ? The expanders will have headers of the letters A to Z with last names for example in the A expander listbox all starting with A .Coding4fun
[URL]
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Dec 21, 2009
In a table I have news posts with these fields:
Title
Content
OwnerID
The OwnerID relates to the ID in the users table, how can I get the name of the user who's ID matches the OwnerID? I'm writing a website in ASP.net (VB).
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Sep 9, 2010
There are 4 fields in my database(exlcuding the primary key)...only 3 fields can be successfully updated. the "Section" field returns an error pointing to da.Update(ds, "moreforengineers")?[code]...
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Jun 16, 2010
I have a connection string set up and a data reader.I have two textboxes on my form for users to type in. One textbox (txtLogin) is a user name and the other textbox is a password (txtPwd). I'm trying to compare what a user types into those two boxes to a table in a vfp database. The table I'm trying to compare to is open about 99% of the time so I need to be able to read from it in some type of "shared" mode.
My Select statement needs to be something similar to "select * from sites where clogin = txtLogin.text and cpassword = txtPwd.text"I just don't know how to get this to work properly.
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Nov 24, 2010
I have a database set up with 2 fields, FirstName and LastName, and i want to display both of them in a single combo box. Right now its only displaying the first name:
[
Dim dtFishermen As DataTable = objDS.Tables("fishermen")
Me.cmbFishermen.DataSource = dtFishermen
Me.cmbFishermen.DisplayMember = "FirstName"
Me.cmbFishermen.ValueMember = "id"
Everything works fine, im just looking for it to display "FirstName LastName" instead of just "FirstName"
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Jun 21, 2010
I have a problem trying to copy 3 fields on a form to a database. The reason I cannot seem to do it is that the last field asks how many copies you want to save in a combo box. So lets say the user selects 3 I need to be able to copy three sets of the same data to the database.
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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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Jun 22, 2010
How do i find out the number, names and datatype of fields in an Access table
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Apr 3, 2010
I am trying to enter a record into an Access database via visual basic programatically.I had this working fine when I had the datagrid bound to the database but now I have decided to do it all at runtime to save on resources at runtime.When I unbound everything and tried running it with my existing code
Try
ds.Tables(
"tblProduction").Rows.Add(row)
[code]....
This is the line of code that has to have another 30 entries in it.
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Jan 5, 2011
I have been tasked with writing a program for our yearly reviews. We want all of the information gathered in the form to be submitted to an access database. I have created the form and the database. I can send info to the database but it is put on a new line everytime it is submitted. I would like to check the first column of the table to see if the user login is already there. If it is there I would like to update the information. If it is not there I would like to create a new row. This seems simple, but I can not figure out how to see if the user login is already there.[code]...
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Nov 21, 2010
I created a database in SQL server compact 3.5 I have a few fields in that.Later when I tried to delete one column and added so more, change was not saved. I did it all using server explorer of VB.Net. when I make the change, at that moment I can see the newly added columns but when I make dataset for this table
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Apr 9, 2012
so far i have this for my code:
Using myConnection As New System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & databasePath & ";User Id=admin;Password=;")
[Code]......
This did not work but did when i just tried creating the table and not the fields.
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Aug 12, 2009
I am an experienced programmer but am new to VB. To start, I am trying to create a simple database program. (My ultimate goal is writing a comprehensive database program in 6-8 months)I have created the database and bound the fields to a form.
But what I want to be able to do is add a field to the database and then also bind that new field to a textbox on the form.The new field appears on the list in the Server Explorer window (on my left) but not in the data sources window (on my right.) The data sources windows has a "refresh" option but that does not help.When I manually add a textbox and try going to DataBindings in the property window the new database field is not listed.
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Jul 16, 2009
i'm doing a project for school which requires me to make a fully functioning database program with validation. I'm done with almost everything except a few things and that includes the database, since i don't really know how to make validation rules and masked fields.It's possible i'm guessing to in forms and such but in datagrid view?
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Mar 30, 2010
I use the following code in vb.net to search across several Access database fields, which works well, is there a way to find out WHICH field had the search data in?
[code]
Public Function Incomming_Number(ByVal strNum As String) As String
Dim oConnect As New OleDbConnection
Dim sql As OleDbCommand
[code]....
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