Skip Updating SQL Row With Empty Values?
Sep 16, 2010
I have a table with several columns that allow NULLs. How would I go about writing a SQL Query that will allow me to skip that column in an update if the value is "empty". Should I use a boolean flag letting the query know to update that value? I do something similar in a SELECT like this SELECT * FROM table WHERE (@boolFlag = 1 OR col1 = @col1Val)But trying to do that for an update has proven to be an exercise in futility. Ideally I'd be able to say skip this value if true, otherwise update over my 20ish columns. Right now I can't pass in DBNull.Value, so instead I'm being forced to insert "" which is converted into whitespace (for instance, my nvarchar(50) has 50 spaces).I'm using a SQL Server DB/Table and a DataSet in VB.NET, constructing my queries in VS2k8 if that matters.
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Mar 5, 2010
My code so far:
If newpound.Text.Length = 0 Then Else
Dim newpound1 As Integer
Static savedpound1 As Integer
savedpound.Text = newpound.Text
newpound1 = newpound1
savedpound1 = savedpound1
newpound.Clear()
End If
What can I put between Then and Else to ignore Dim newpound>newpound.clear?
If the text box is empty and it moves on to the next one.
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Dec 4, 2009
How to tell the program that if the field is empty to skip it and go to the next step. I have tried IsEmpty (but it tells me the variable IsEmpty was not declared), I have tried to use different If statements but in most cases I get the message
"Conversion from type 'DBNull' to type 'String' is not valid."
I tried using an integer variable and setting it to
'Test = CStr(dt.Rows(I)("socSecNumber")).Length'.
It works for the first step (which makes sense b/c socSecNumber is never empty), but when I set the 2nd and 3rd ones
(TestFName = CStr(dt.Rows(I)("firstName")).Length TestLName = CStr(dt.Rows(I)("lastName")).Length If TestFName > 0 And TestLName > 0 Then...)
Then I am back to getting the message
'Conversion from type 'DBNull' to type 'String' is not valid'.
I do not know anything about recordset and when I did try to use it it displayed the message something like 'get and set are no longer allowed'.
The entire function is below:
Private Sub BtnCreateLetter_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnCreateLetter.Click
Dim SSN As String = TxtBxSSN.Text
Dim dt As New DataTable()
[Code] .....
Is it possible to include something in the SELECT from table? Such as:
"SELECT * FROM" & Students & "WHERE" * NOT DBNull
or
I do not know if it is possible to use variables in the SELECT from table code but if it is I thought perhaps could make a variable named FieldContents and pass it to a function that would do something like:
"SELECT * FROM" & Students & "WHERE" * FieldContents LIKE '[A-Z]'
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Jun 13, 2010
I am reading from a textfile. How can I skip a line if it's empty?
Or is it possible to delete at the beginning of ReadAllLines to remove this empy lines.
An empty line would be following:
text1
text2
"empty line"
text3
[Code]....
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Apr 4, 2012
The problem is: I have a list of objects, with some containing the same PlanId property value. I want to only grab the first occurrence of those and ignore the next object with that PlanId. The root problem is a View in the database, but it's tied in everywhere and I don't know if changing it will break a ton of stuff nearing a deadline.
So, if I have a list of PlanObjects like such.
Plan1.PlanId = 1
Plan2.PlanId = 1
Plan3.PlanId = 2
Plan4.PlanId = 3
Plan5.PlanId = 4
Plan6.PlanId = 4
I want to take a sub-list from that with LINQ (italics mean an item is not included)
Plan1.PlanId = 1
Plan2.PlanId = 1
Plan3.PlanId = 2
Plan4.PlanId = 3
Plan5.PlanId = 4
Plan6.PlanId = 4
For my needs, it doesn't matter which one is taken first. The Id is used to update a datsbase record.
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May 9, 2011
I have a gridview control that i am manually binding the data in. When i edit a row and update it the values of the text boxes that are sent are always the Old Values. I've found a few threads on this but have not had any luck extracting the new values.
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:CommandField ShowEditButton="True" />
[code]....
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Mar 23, 2009
Dim re As New Regex("((?<field>[^"",
]+)|""(?<field>([^""]|"""")+)"")((?<rowbreak>,
|
|
|$)|,)")
[Code] .....
Now it puts all the data in the correct columns but there's just a comma in the empty columns.
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Jun 10, 2010
Empty values in byte array at the end of one packet are replaced by beginning values of the next packet sent in TCP connection. How may I avoid this?
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Sep 15, 2009
I am trying to update a value of a node in an XML file. I can navigate the file, but when I use the SetValue function, it doesn't seem to update the value in the file. Is there some save or commit function I need to perform?
Here is the code:
Dim doc As XmlDocument = New XmlDocument()
Dim navigator As XPath.XPathNavigator
Dim nsMgr As XmlNamespaceManager
Dim Done As Boolean = False
[code]....
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Aug 25, 2011
The program i am writing has 5 features, all of which i want to run in their own threads. On the main for I have a listView which contains all the accounts (user password etc). The thread is defined as:
Public fbaThread As New Thread(New ThreadStart(AddressOf fba_Start))
In cmdAdderStart i begin the new thread by:
fbaRun = True
fbaThread.Start()
[Code]....
I have managed to write the UpdateDebug() to update my txtDebug on the main form. But now I am having trouble being able to pull the values from lvAccounts.items().subitems I can accomplish this with global variables but i'm sure this is not the best way to do this.
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Mar 17, 2010
When I update but do not really made any changes to the value and press the update button, the data becomes null. And it will seem that I deleted the value.I've taught of a solution, that is to add both combobox1.selectedtext and combobox1.selecteditem to the function. But it doesn't work.
combobox1.selecteditem is working when you try to alter the values when you update. But will save a null value when you don't alter the values using the combobox combobox1.selectedtext will save the data into the database even without altering.But will not save the data if you try to alter it.-And I incorporated both of them, but still only one is performing, and I think it is the one that I added first:
Dim shikai As New Updater
Try
shikai.id = TextBox1.Text
shikai.fname = TextBox2.Text
shikai.mi = TextBox3.Text
[code]....
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Jan 23, 2012
if textbox1.text =S1, S2 then on button click event the S1 and S2 column value of Table in MSSql2005 database will be updated with the value "b" where date=1/3/2012
But the update is not working...
My MSSQL2005 Database structure :
id date S1 S2 S3
1 1/3/2012 b b NULL
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Jul 9, 2009
I have a form with a number of controls based on those controls and a database i filter what data i want to be in AllowableHeightsCombobox. I am using an Arraylist to hold the data. The problem i am encountering is that after filling allowableHeightsCombobox once, it will not update or change the values in it. this is the only place where i change the AllowableHeightscombox's datasource.
[Code]...
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Apr 1, 2011
Not able to update the table in access using the below function
Private Sub btnUpdate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnUpdate.Click
Dim cn As New OleDbConnection(Con)
Dim objUpdateCommand As New OleDbCommand
Dim objDataAdapter As New OleDbDataAdapter
[code].....
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Jun 11, 2009
In a WinForms app (VS2008 / .Net Framework 3.5) I bind data from SQL Server to controls. If there's a null value e.g. an employee has no middle name (allowed by business rules), when I browse that record at runtime an exception is thrown. So I code: If Not (row("middle_name") Is DbNull.Value then txtMiddleName.DataBindings.Add(New Binding("Text", row, "middle_name)). Say someone adds a middle name to this record, because the control had no databindings the dataset.HasChanges property is false and update stored proc doesn't run. I guess I could handle this like this: If txtMiddleName.Databindings.Count = 0 AndAlso txtMiddleName.Text <> "" Then row("middle_name") = txtMiddleName.Text. I guess I would have to do something similar to handle a value changing from not null to null.
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Aug 18, 2011
There are 2 subs. First one populates a DataGridView with data from a SQL table:
Dim SQLCom As SqlCommand
Dim myDA As New SqlDataAdapter
Dim myDS As DataSet = New DataSet()
[Code].....
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Oct 1, 2011
I am trying to use several Class arrays to hold values that I will cycle through at a later point to perform some calculations. I need to change the array sizes to fit the data as it is entered. I am using one procedure to set the first element of each array and then a separate procedure to pass the additional values as they are entered.
Until my last attempt at changing my code, my StartBalance sub seemed to work, I could step through and see the values assigned to the class arrays in the code block. However, when it moved on to the Transaction sub, it did not recognize that the first set of values were set, the array shows zero values for index 1.
I have gone through several changes trying different ideas from reading blogs and articles, but I guess I am not understanding how these work. I even used the class arrays directly instead of the Property procedures to see if I would get a different result, but I do not.
I believe I must be approaching this incorrectly and though I can find dozens of examples of setting class variables and even a couple on using arrays as class variable, I can not find any that show how to then pass values to those arrays.
Public Class Statement
Private _tranDate(1) As Date
Private _amount(1) As Double
[Code]....
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Jul 8, 2008
on a windows form i have a combobox called currency, it is populated by a table-adapter called exchan-gerate which is turn populated by a dataset called mydataset. on form load, i issue update commands to the back-end database that holds the table which populates the dataset - they work. if i look at the update to the combobox, they are not reflected until i exit and restart the app - then they're fine. further down the form load i've tried:
Me.exchangerate.Update(Me.DataSet.Currency)
Me.CurrencyComboBox.Refresh()
am i missing something silly to have the values in the combobox change and refresh at the time of the update to the database? as i said, an exit and restart of the app displays the accurate data.
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May 1, 2009
I am trying to update a link table with values from multiple datagrids, the field types in the link table are numbers and the value selected from the datagrids are also numbers. I am getting the following error:
The OleDbParameterCollection only accepts non-null OleDbParameter type objects, not String objects.
In line : cmdCompany.Parameters.Add("@COMPANY_ID")
Dim ConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|aop29.mdb"
Dim cmdCompany As OleDbCommand
Dim cmdReceiver As OleDbCommand
Dim CompanySQL As String
[Code] .....
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Mar 18, 2011
I have the following code:
[Code]...
The problem I'm facing is that the update happens correctly only for the first of many values. All the other values are calculated and consequently, updated incorrectly in my table. I am almost certain that the looping is what is causing the problem but have been unable to find a way around it.
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Jul 29, 2009
Here is my
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=BHgardeners11.mdb;")
cn.Open()
Try
str = "UPDATE Products SET ProductCode = ?, ProductManufacturerCode = ?, ProductsTitle = ?,
[Code] .....
If there is only one item in the database, then this code works. If there is more than one record then the error is produced that it is trying to produce duplicate values. This is down to the Primary key in my database which is the only thing that cannot have duplicate values. However, when I remove the primary key it has the predictable problem that it goes crazy and does weird things.
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Jul 28, 2010
(The following code cant work , it just wont update.. my bar default max is 80 and its still shooting over 80, its not dividing)
Sub displayprogress(ByVal amount As Integer, ByVal progress As ProgressBar)
progress.Value = 0
For i As Integer = 1 To amount
[code]....
i did try replace the question with SQLLquestion(0) but the result given was 0 and not the question from database i tried calling function sqlquestion() from one of the form but it just cant work i think tis wrong...
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May 23, 2012
I'm writing a time entry program to record when an employee checks in and when they check out.I'm struggling on the part where I need to calculate a time span (time out / time in). I am selecting the In Time, Out Time, and Total columns.I want it to take the Out Time subtract it from the In Time and place that value in the Total column.I have so far and have tried several variations of different updates but have had no luck.[code]I keep getting a syntax error in the UPDATE statment.I'm not very fluent with OleDB yet and I'm not sure if I'm doing the update correctly.I have no problem with OleDB and single UPDATES or single field updates but when I am updating multiple rows with different values.
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Jul 22, 2010
I am checking for empty string values, but how do i see for the Quantity text box if the user chose only numerical values after the empty string. For example...
[Code]...
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May 14, 2009
I have a DataGridView that has some columns with dates. It binds to an in-memory Datatable which gets loaded from an string array of data passed back from the backend Some of the rows returned have nulls for the date columns. Solution 1: If I define the Date column in the DataTable as "string" I can easily convert those nulls to empty strings and display it in the grid as empty strings (desired results). However, if the user clicks on the date column header to sort by date, it doesn't order the rows as you want. You get a purely string sort order. Not acceptable
[Code]...
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Jan 25, 2012
I have a webpage with a form that is used to edit some object. This object contains a Collection of other objects defined like this: Public Overridable Property Employees As List(Of Employee)
On a form I can delete an employee, add a new one or modify existing one. When I click save new values are sent to the server. On a server I check if the user exists. If exists then I modify its values, if it does not exist then I add it. All employees that exist on the server and were not sent are marked as deleted (State changed to EntityState.Deleted). I try to use the following code (dbCollection = database entities, newCollection = collection sent from the form):
[Code]...
This code does not work, because changing to EntityState.Deleted removes the object from collection, and for each loop breaks, since the collection is modified...I know that I can overcome this problem by using a for loop or adding objects to delete to some other list first, but I hope maybe there is a pattern that would make my code nicer.
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Jul 16, 2006
I have a 'For Each' loop that contains some items I don't want to analyse. Now I use a GoTo command to 'skip' an item. But this is not very elegant and (knowing .NET) there is probably a way to skip to the next item without using GoTo.
I'll show you a simplified version of my loop, designed to add all animals to a list, except the Leopard :
(Indeed, simplified, because there's like two pages of code in the real loop. )[code]....
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Jun 21, 2010
I m using vb .net2008. I want to skip read-only columns, for this I use these codes But their some error, how is it possible??
[code]...
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Dec 30, 2011
following is the code at button event which copy data from one DGV (dgvAccesList) to another DGV (dgvProbReport) and its working properly. Its paste data to 3rd and 4th column of destination DGV.But the problem is that, if at source DGV first column and second column have data..lets say up to 2 rows..then its copied data starting from 3rd row..for the 3rd and 4th column..which is incorrect..its should be always start with first row of third and fourth column.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
For Each dgvRow As DataGridViewRow In dgvAccesList.SelectedRows
Dim dgvNewRow As New DataGridViewRow
dgvNewRow.CreateCells(Inward.dgvProbReport)
[code]....
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Jan 6, 2011
I have a datagridview and I want to click on it BAD to jump to 4 cell, but to walkwith the arrows is normal, I did this because the KeyDown / UP does not work becausethe cells are in Edit Mode:
Private Sub DataGridView1_EditingControlShowing (ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) HandlesdgvContactos.EditingControlShowing
Dim EditingTxtBox The TextBox = CType (e.Control, TextBox)
[code]....
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