Incomplete Query Of Dbf Using Oledb?
Mar 26, 2009
I'm trying to connect and query a .dbf dBase table. I'm fairly certain I've got the connection string formatted properly, because I am no longer receiving errors that I can't locate the table.I've tried everything I can think of, and nothing seems to work to make a valid query. I've tried all sorts of syntax changes around the table name (which is just 'buildings'...nothing fancy). The error is a syntax error with an incomplete query on the executereader line.
[code]...
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Jul 11, 2011
I built a prototype system with some database queries. Since it was just a prototype and I was very new to databases, I just used a direct string. This is the string I used and it works fine:
command = New OleDbCommand("SELECT * FROM " + prefix + "CanonicForms WHERE Type=1 AND Canonic_Form='" + item + "'", dictionary_connection)
Now, in putting it in a real system, I wanted to use the more secure parametized method, so after some googling I came up with this:
command = New OleDbCommand("SELECT * FROM @prefix WHERE Type=1 AND Canonic_Form=@form", dictionary_connection)
command.Parameters.AddWithValue("@prefix", prefix + "CanonicForms")
command.Parameters.AddWithValue("@form", item)
But all I get is an error for an incomplete query clause. What have I done differently between the two?
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Dec 2, 2007
For some reason every time I execute the code, it gives me the error "No value given for one or more required parameters" and it points to the ExecuteNonQuery. Below is the relevant code I have.
Public Function sqlUpdate(ByVal varBalance As Double, ByVal varWithdrawlAmount As Double) As Double Dim dbCon As New OleDb.OleDbConnection dbCon.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source = dbATM.mdb" Dim query As String Dim cmdUpdate As New OleDb.OleDbCommand dbCon.Open() varBalance = varBalance -
[code]....
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Jun 29, 2009
I have the following code which will only return one column of 41.
vb.net
Using Command As New OleDb.OleDbCommand("SELECT * FROM Products_TAU WHERE ItemID= @ItemID", Connection)
Command.Parameters.AddWithValue("@ItemID", ItemID)
[Code]....
That table alone is filled with 76 records and has 41 columns of data to pull.. this is only returning the first column of the row indicated by the where clause.
Before I had the where clause call it by lineID which there is 4 records of that... and it was able to pull 4 columns from it...
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Nov 1, 2010
in pervious version of VB (DAO 3.6) I used to be able to delete a query object and then creating it again (not the records) using the code below. but I am having a hard time finding how to do it using the OleDb in VB.net.
Dim ws As Workspace, db As Database
Dim qy As QueryDef
db.QueryDefs.Delete ("WISE QUERY")
[Code].....
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Aug 19, 2010
I have a program (below) which runs an SQL query on an Access database to bring back records based on the date a user selects. This issue seems to be that US date formats are the only date formats that SQL queries accept. I may be wrong, but this is my understanding. All my dates in the database are in EU date format (dd/mm/yyyy). What happens when i run my code is that I can not access a record with the date of 08/05/2010 unless the input date is 05/08/2010.
[Code]...
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Oct 1, 2011
I am connecting to a MS-Access 2007 database using VB 2010 and OLEDB. Conducting the following test seems to suggest that MS-Access does not interpret DBNull.Value correctly when sent as a parameter from OLEDB:[code]
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Mar 5, 2008
You can query active directory with an OLEDB provider called ADSDSOOBJECT. This works great except it only returns the first 1000 rows. The following article shows how to work around this limitation in a vb script by setting the "page size" property of the command object. [URL]..I have been able to reproduce that code in VB.NET, but I am having problems getting it translated to OLEDB syntax, because there doesn't seem to be a "Page Size" property, or indeed a "properties" collection of any kind, in OLEDB.
[Code]...
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Feb 6, 2012
I have database with table called "Konzultacije" with field "Vrijeme" (Date/Time). I have datagridview (DGKonzultacije) with columns. Column (1) data format is set to date/time. I want to delete record from "Konzultacije" table depending on selected cell in datagridview but only I can get is error.
This is my code:
Dim iSql As String = "DELETE FROM Konzultacije WHERE Vrijeme = " & DGKonzultacije.CurrentRow.Cells(1).Value
conn.Open()
[CODE]...
If i add apostrophe like this:
Dim iSql As String = "DELETE FROM Konzultacije WHERE Vrijeme = '" & DGKonzultacije.CurrentRow.Cells(1).Value & "'"
error is raised: Data type mismatch in criteria expression.
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Oct 18, 2010
Just wondering if i might hit a snag in my program. Ive got 10+ users using the same files, via a Oledb to put info into an excel spreadsheet. If 2 or more people save there file at the same time will the program go into read only on one person. Normally one 3 will use the file at one time. I know Sql itself would be better to use. best way i can describe it, normally using excel if you manage to open the same file twice one opens as normal but the other opens as a Read only file, will the same thing happen if im using Oledb connections?
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Apr 17, 2010
I've been working on a project for months now (vb 2008 express). There is one final which I can't solve.I need to send images to a client from a 'server'(listener). The code below works most of the time but sometimes the image is incomplete. I believe this might be something to do with the tcp packet sizes varying, maybe limited by how busy it is out there on the net. I have seen examples of code that splits the image into chunks and sends them out, but I can't get them to work maybe because I'm using a different vb version. The pictures to be sent are small 20k max.
Any working code examples would be wonderful. I have been experimenting and failing with this final hurdle for weeks.
[Code]...
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Apr 17, 2012
I use the webbrowser control in my program but when after navigate to a site. I try to get some element on the using the document of the webbrowser (like getelementbyid ... ) I notice that some element are missing. I know that elements are dynamically inserted into the page by some javascript. I searched method to get those element and I try to get them injecting a javascript to be executed in the page and return some element by window.external method (or just to try by alert) but even if this script are executed they just return the same result as the method on the document in the original code. Is there a way to access to this 'invisible' element in my program in some way just like I access them by pressing F12 in Internet Explorer?
Here is my code:
private void button2_Click(object sender, EventArgs e) {
//injecting and executing my javascript code
HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
[Code] ....
At the end of the execution both test and test2 have the same html were some element are missing.
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Jun 11, 2010
Reading tags from a Geo-TIFF file works great on XP and Vista, but does not work on my new Windows 7 box using the exact same code and image. Several of the critical tags are missing. Here is my sample code:
Dim b As New Bitmap("C:myMap.tif")
Dim list As String
For Each p As PropertyItem In b.PropertyItems
[code]....
On XP and Vista, this is the result:
256, 257, 258, 259, 262, 273, 274, 277, 278, 279, 282, 283, 284, 296, 305, 320, 339, 33550, 33922, 34735, 34736, 34737
On Win7, this is the result:
256, 257, 258, 259, 262, 273, 274, 277, 278, 279, 282, 283, 284, 296, 305, 320, 339, 34735, 34737
Why would it be different? I'm compiling as 32bit (crashes if I try 64 bit); running as admin, have tried running the exe with various compatability modes set...no difference.
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Feb 8, 2011
Incomplete - Computer.Network.UploadFile?
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Nov 19, 2009
I am working on an app that requires searching the source code for a printer's web page for some information. I have used several methods to retrieve the source code (WebClient.DownloadString, HttpWebRequest.GetResponse) and in all cases recover only a portion of the web page. I can use View Source on the webpage and it is a 14K file, but using the VB functions I only get 5K of it. In these cases the data stops just prior to a <div class="tabBox"> tag containing data specific to the printer. I have also added code to pause the app, thinking that maybe it needed time for the page to complete before returning the code. Any ideas what I need to do to get the whole page?
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Dec 8, 2010
I have a class that implements IXMLSerializable. With this interface comes WriteXML, ReadXML and GetSchema. I've noticed that the ReadXML implementation crashes beyond repair (i.e hangs indefinitely) while deserializing when the XML Data is incomplete.[code]
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Jun 25, 2010
I have a class that implements IXMLSerializable. With this interface comes WriteXML, ReadXML and GetSchema. I've noticed that the ReadXML implementation crashes beyond repair (i.e hangs indefinitely) while deserializing when the XML Data is incomplete. For example, given the following XML
<SomeObject>
<SomeValue>This is a string</SomeValue>
<AnotherValue>This is another string</AnotherValue>
</SomeObject>
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Aug 9, 2011
I am trying to download a 163 KB jpg file from the web with Webclient. The dimensions of it are ~332 x 491 pixels.
[Code]...
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Aug 21, 2009
Form A accepts user input, closes and calls Form B when user wants to see results. Form B starts calculations automatically. Meanwhile, it partially displays and can disappear completely leaving an empty window. The calculations can take some time. It seems as if a form needs code to stop running and be awaiting user input before it finishes drawing itself. Is there a way to circumvent this? Aside from the aesthetics, I would like user to see progress reports posted to status bar and without needing to press another button (so removing automatic start). Form B has only a return button for input.
I have tried various places for Me.Show and addressing the form's controls from the modules it uses.
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Jun 24, 2010
To object oriented programming and programming with visual basic .net (vb 2008 express). regarding storing of information but not in a database. Someone mentioned using binary or xml serialization. So I researched that and after two long 8 hour days of messing around with binary serialization and about a dozen different code techniques i finally found one that seems to work. I created a module that serializes two variables and appends them into a file. The same module also has a sub that deserializes the information from the file and displays in a message box. If needed I'll provide the code later.
Really the problem I am having is that my message box only displays the first entry into the file and no other. So I can append any number of variables to the file but every time I call the subroutine in my module it only displays the first entry. How do you read all of the file? Also can I search the file for a particular value of a variable? The variables are codependent. The two variables are simply a date and a string representing a changing code that corresponds to that specific date. So I'd like to be able to say search for a date and retrieve both the date and the code.
However I don't have any idea how to do this. Also the messagebox.show method is probably not the best way to illustrate the information in the file but I'm still new and I'm not sure the best way to show all the info in the file. For instance if I wanted to show the entire contents or just the codes corresponding to certain dates. I know a database is probably the better answer but I've gotten this far without one, lol, I'm too stubborn to change now. Once I figure this out, I'll switch and try the same technique with a database.
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Aug 19, 2010
Here is the code:
Function getData(ByVal id As String)
Dim reader As SqlClient.SqlDataReader
Dim statement As String
[code].....
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Feb 29, 2012
When Creating a query using the sear Criteria Builder . I keep getting the error : "The schema returned by the new query differs from the base query" what does that mean and how do i avoid this problem in future
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Apr 28, 2010
I am connecting to an Access database and using a parameter query with the LIKE operator to return all rows that match query. The string to search for is taken from a Textbox
sql =
"Select * FROM Allview WHERE Info Like" &
"*" &
CStr(TextBox1.Text) &
"*"
The query does not return any data in vb, but when run from access with same string, there is data returned.The connection to the database is done correctly, as I am able to return data with various other queries.
Partial code :
Dim
con As
New OleDb.OleDbConnection[code]....
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Apr 7, 2012
I am trying to run a query an Access db from VB. The general query which I want to run is
SELECT * FROM Patient WHERE Patient.PatientID = ?
or SELECT * FROM Patient WHERE Patient.PatientLname = ?
I tried using an input box which captured the user input and pass that variable to the query, but that failed. Then I read about writing a function and using that, however, I keep getting an error which says Function not defined, but when stepping through the code, it seems to work. Here is my function: [Code]
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Aug 27, 2010
The database:
"ID (Primary key)" | "Title"
0 | "title1"
[code].....
OK, before adding values to database, we should check if a row exists with this values :)TO do this, creating a Stored Procedure is a best way to deal with the database fastly.So... The problem now is, at the runtime, Miss OleDB throw this error:Microsoft Jet database engine cannot find the input table or query 'IF
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May 29, 2009
i should say hi experts :D . Help me with this pretty code :)
The database:
"ID (Primary key)" | "Title"
0 | "title1"
[code].....
OK, before adding values to database, we should check if a row exists with this values :)TO do this, creating a Stored Procedure is a best way to deal with the database fastly.So... The problem now is, at the runtime, Miss OleDB throw this error:Microsoft Jet database engine cannot find the input table or query 'IF
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Sep 14, 2010
I have to join two main tables, and I need to filter the results by elements in an ASP.NET web form. These filters are created on the fly so I have to use a lot of where extensions to filter the query. I want to execute the query with as optimized SQL as possible.
I am first doing a simple join between TW_Sites and TW_Investigators. Then there are two sub-tables that are involved. TW_InvestigatorToArea and TW_InvestigatorToDisease. While most of the where clauses are working fine, I have found a performance issue that won't be an issue right now, but will be an issue as the table gets bigger.
The arrays DiseaseCategories and DiseaseAreas would be the results of a CheckBoxList result.
Protected Sub LoadResults()
'Get Dictionary of Filters
Dim FilterDictionary As OrderedDictionary = Session.Item("InvestigatorFilterDictionary")
' Initialize LinqToSql
[code]....
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Oct 15, 2011
I created a RDCL in the designer. I would like the User to Determine what is shown in the Report. How can I change the query at runtime? (ex. changing the customer Name)
This is the query that I have in the properties:
SELECT [Date], Address, Customer, Orders
FROM Report_qry
WHERE (Customer= 'JohnDoe')
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Mar 11, 2010
how to take a query that returns a single row of data and load that data into textbox controls.I know about ExecuteScalar but it is only good for a single column of data from the query.
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Jul 11, 2010
I've got confused at the moment.I've got one database to developed for MLM (Multi level marketing) company.so, there's one Members database.. each member have unique ID called membercode.. and all members can members under them.. can make 2 members down to 1 member.. all members are added in same table named "tbMembers" and for each member there's a "parentID" where I add member's membercode under whome that member is?.. right?
Now what's the matter is .. I want a SQL Query which can go under and under.. like 'John Doe' having two members under him named 'Suzan' and 'Ellie' and 'Suzan' is also having 2 members under her.. and same for Ellie. and for example.. 'John Doe' having about 300 members in his down line? All members are making transactions.. like they purchase product and Invoices are being generated (invoices tables have 'memberID'). Now the query is how to generate query which can calculate John Doe's Downline's TurnOver from invoices table's 'totalAmount' field's SUM?
I'm using Asp.net 2.0 (VB.net) and use SQL Server 2005 Express.
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