here is my code. dont seem to know whats the problem. i have 12 data fields in access excluding the ID field.
Dim strCon As String = "Provider=Microsoft.jet.oledb.4.0;data source=C:UsersdexterDocumentsdesktopcsci14databaseMuseum-final.mdb"
Dim dSet As New DataSet
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I am getting the above error in my code. I've searched the net (on this site and others) for a solution to this problem and it seems that its either something to do with a field name being a reserved name ie. Date, Time etc.... or its missing (') or (") in the SQL command. ive tried both these solutions to no avail.
Dim objDataAdapter As New OleDbDataAdapter
Dim objDataSet As New DataSet
Dim objDataReader As OleDbDataReader
Dim i As Integer
Dim SQLstr As String
[Code] .....
i am making a simple testing application within visual studio 2010, thought im gonna be direct. in ms.acces i made a database with a few tables, this one is about the table : leden. the error indicates that i simply do not have enough values to insert into the table and i think it has to do with the ID(autincrement in acces)
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Private Sub ButtonSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSave.Click
If frUpdate = False Then
[code].....
Private Sub ButtonSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSave.Click
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I still can't assign the process the username of the session id that is associated with it.[code]...
View 1 RepliesI have a problem with a sql query. Through the query I am trying to search database for any occurrences of string (can be anything) in a column using the SQL LIKE command. The problem is that it works fine for most of the strings say john, jim, ji"m , but does not work when i include the following characters which are ( ' , { , } , and a single quotation mark). MYSQL query takes care of these special cases by putting them in [] block whenever user enters them .But i am getting the following error when i go to query the database using the GetSelectCommand() in VB.NET
Exception Details: System.ApplicationException: Number of values provided must be equal to the number of placeholders in query.I have checked the query over and over again .. but its fine .My database server is Sql Server 2008.So my application throws the exception in this command:
Using reader As MustDisposeDataReader = _
pmSystem.DatabaseManager.GetSelectCommand(selectStatementBuilder.ToString(), New Object() {})
Where MustDisposeDataReader is an instance of a class in an internally developed library, which inherits from System.Object. pmSystem is an instance of the class PlanManagerSystem which implements the commandlayer. GetSelectCommand() takes the select command
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.
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I am writing a little program that does the following:Allows the user to enter a id number.Then when the find button is clicked, we connect to the database and run a select statement for the id.I am trying to figure out how to get the first name, last name and birthdate into textboxes on my form.
I would like to have a way to display a messagebox if the resultset = 0 so as to tell the user no records found.Then if the information is correct I am going to have a button to update the information which is going to call a stored procedure I have in place to update the record.how to make the connection which I think I have working and then loading the individual fields into the appropriate textboxes.
This LINQ to SQL query From g In Db.Context.Current.Groups Select g.GroupID
generates this SQL:
SELECT [t0].[GroupID] FROM [dbo].[Groups] AS [t0]But this query From g In Db.Context.Current.Groups
Select g.GroupID, g.MemberCount
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I very much want to select only the fields I need. How can I persuade LINQ to SQL not to select all columns?
How to pass the query string using hidden fields in vb.net...
View 3 RepliesMy LINQ query contains the following Group By statement:
Group p By Key = New With { _
.Latitude = p.Address.GeoLocations.FirstOrDefault(Function(g) New String() {"ADDRESS", "POINT"}.Contains(g.Granularity)).Latitude, _
.Longitude = p.Address.GeoLocations.FirstOrDefault(Function(g) New String() {"ADDRESS", "POINT"}.Contains(g.Granularity)).Longitude}
The query works, but here is the SQL that the clause above produces
SELECT [t6].[Latitude]
FROM (
SELECT TOP (1) [t5].[Latitude]
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but this produced an error: "A group by expression can only contain non-constant scalars that are comparable by the server."
I've been running into some errors with converting strings to dates in the following code. I have recently added the intcall.Value = DateTime.Parse(txtIntCallDate.Text) function which had gotten rid of the error message, however the records are not being updated, any of them on the form. Prior to this the strings were being updated just fine. As long as there is a date entered on the form there is no error, if it's left blank i get the "Problem converting string to datetime"
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I have a problem with unicode character, as i create a database in SQL Server 2005. I want to query from a table that criteria fields are contain unicode character i.e NVARCHAR.
e.g: SELECT * FROM tblMyTable WHERE MyField='ភាសាខ្មែរ'. But when i did like this all rows that contain Unicode Character always display. it doesn't fit to my criteria
How can I get a Variable's value set to the number of Data Fields in my DataBase that is NOT Nul.
I have in a table 10 fields or columns Named: Ing1, Ing2, Ing3, Ing4, Ing5, Ing6, Ing7, Ing8, Ing9 and Ing10. This fields will all most never all be fild, will be fild from 1 upwords. I need to know how many of them is NOT Nul.
I have a dynamic query which returns a DataTable. This DataTable will contain a varying number of columns depending on the selection used in the query. I want an efficient way of filtering the records in the DataTable.
For Example The DataTable contains columns : A, B, C and D
I need to query this data at serveral points in my program. At some point I may need records where A=10 and C>40. At another point I may need records where A<10 and D=90 etc.etc. The selects are dymanmic, I do not now what Columns or values are needed until the code is executing.
I could simply use a DataTable Filter and build the selection string dynamically. I have no problem with this. However I was wondering if using LINQ would be more applicable. I am completely new to LINQ and would like to use it but don't know its capabilities.
(At present I am using a DataTable but in future this may change to a collection of Objects)
I'm trying to query old Access database tables and compare them with SQL Server tables.They often don't have primary keys, or they have extra fields that had some purpose in the nineties, etc., or the new tables have new fields, etc.I need to find records - based on a set of fields specified at runtime - that are in one table but not another.So, I do this kind of query all the time in SQL, when I'm comparing data in different tables:
dim fields_i_care_about as string = "field1, field2, field3"
'This kind of thing gets set by a caller, can be any number of fields, depends on the
'table
dim s as string= ""
[code]....
It tells me it can't convert a Boolean - Is there any way to do this without Linq expressions? They seem far more complex than what I'm trying to do here, and they take a lot of code, and also I can't seem to find examples of Expressions where we're comparing two fields in a subquery.Is there a simpler way? I know I could do the usual EXISTS query using JOIN or IN - in this case I don't need the query to be super fast or anything. And I don't need to use a DataTable or DataSet - I can put the data in some other kind of object.
I am writing a parsing method for a csv record and want to throw an exception if the number of fields in the record do not match the expected length
View 3 RepliesI have a FormView where I pull data from one table (MS Access), and then insert it (plus more data) into another table. I'm having issues with the dates.The first table has two date fields: date_submitted and date_updated. In some records, date_updated is blank. This causes me to get a data mismatch error when attempting to insert into the second table.It might be because I'm databinding the date_updated field from the first table into a HiddenField on the FormView. It then takes the value from the HiddenField and attempts to insert it into the second table:
Dim hfDateRequestUpdated As HiddenField = FormView1.FindControl("hfDateRequestUpdated")
myDateRequestUpdated = hfDateRequestUpdated.Value
'... It then attempts to insert myDateRequestUpdated into the database.
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I am new using Vb. I did create an app that accept general customers info, and save it into a database using the bindingsource component(I don't know how to do it with SQL from VB). Everything was fine, but adding a couple of maskedtextbox has become difficult. I don't know how to pass the value of this fields to the database. I used the following code:
phonetextbox.text = maskedtextbox.text
Leaving the original fields in the form, I see the values on them, but they never goes to the database. Is this just possible using sql command from VB?
I have this Text: Hello <<FirstName>> <<LastName>> in which the <> and <> are merge fields in a document, and I have a list of customers in an array which I want to allocate them to these fields. How do I do that?
View 2 RepliesI need to import a big fixed width text data file into SQL server. Before importing, how to determine how many fields and records in the file?
View 11 Replieshow to disabled and uncheck the checkbox values from database fields.. if i have entry in my database records as :
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I want on page load event the default date for todays is 11-Dec-2010 then checkbox1, checkbox2, checkbox3, checkbox4 will be disabled and unchecked state for 11-Dec-2010 as you see on the above database structure the seats for 11-Dec-2010 is 1,2,3,4 so the chekbox1, checkbox2, checkbox3, checkbox4 will be disabled... I wanna this code snippet in VB.NET
I have a class (using a class rather than a structure only because I can set a default field value for the fields I declare in the class) and I'm using a web service that returns information (demographic information) in JSON. I am using LINQ to get the values of each "entry" from the returned list and in that, I have to parse through and pull out the actual data that I want.Here's how I have it doing right now (just a start, there are 44 of them total, thus my question which will follow the code):
Dim returnedStats = From ljo As Linq.JObject In returnedObject.SelectToken("results")
'
'
For Each stat As Linq.JObject In returnedStats
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I have a DetailsView which has two fields - one that is visible, one that is not. The first the user fills out, the second I want to auto-populate. Unfortunately, I haven't been able to find a way to set the value in this second invisible field. I've tried adding code like this to the Page_Load:
If Not IsPostBack Then
DetailsView1.DefaultMode = DetailsViewMode.Insert
Dim txt1 As TextBox = DirectCast(DetailsView1.FindControl("Type"), TextBox)
txt1.Text = "administrator"
End If
But this returns an error of "Object reference not set to an instance of an object." Any ideas on how to accomplish this - either using the method above or another method?The hoped for end result is that when a new record is inserted via the DetailsView that this record will include the username (entered by the user) as well as the "type" of "administrator"
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?
I have an SQL statement which i need to code in vb:
CODE:
Notice the fields prodno1 and prodno2 in the table structure.. this is part of a number of sql statements i need to run and put inside a loop. my problem is i want to automatically use this same code such that on the next loop, this sql statement is going to be:
CODE:
Note that in this "2nd loop"
- the table name is now r3 from r2 in the first SQL statement
- there are now prodno1, prodno2 and prodno3 instead of just prodno1 and prodno2
- in the WHERE clause, the p.prodNo becomes p.prodNo2
And so on and so forth.. so for the 3rd loop
- there's going to be r4
- there's going to be prodno4
- in the WHERE clause i will use p.prodNo3
I have an application that updates a great number of fields on a pretty short interval timer. (on a standard form)Question is as follows... which one of these statements will work better for this? (working better = faster/smoother)Dim textToUpdate as string
if textbox1.text <> textToUpdate then textbox1.text = textToUpdate
OR textbox1.text = textToUpdate
I have tested my code in order to pass single value to single parameter field in crystal report from VB.NET Form, it is ok but the problem is that I want to pass multiple values to only one parameter field called "Product Name" and it displays only one last record.
I want to display like this
Receipt : 0001 Product Name
pencil
pen
stamp
book
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I already set parameter field "productname" for allowing to multiple values, but it is still the same.
I'm trying to use hyperlink fields in my gridview to pass certain values into another page using querystrings. On the next page I've put 'labels' that should be populated with data from the gridview, however nothing happens. This is my gridview code:
Code:
"<asp:GridView ID="GridViewGuitars" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSourceGuitars" DataKeyNames="ProductID" BorderColor="White">
<Columns>
[Code].....