Returns The Records In DiskInfo That Have A Matching DiskNumber In The DataInfo Table?
Nov 23, 2009
I have a VB2008 Windows Form with a SDF database. The database contains two tables. The following query returns the records in DiskInfo that have a matching DiskNumber in the DataInfo table. How do I get it to return records in DiskInfo that DO NOT having a matching DIskNumber in the DataInfo table?
Dim DiskQuery = From DQ in DiskInfo join DI in DataInfo on DQ.DiskNumber equals DI.DiskNumber Order By DQ.DiskNumber select DQ
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Aug 12, 2010
Below is the code snippet where i would like to display a msgbox if there are no matching records. I always get a NullReferenceException at iRows = ds.Tables
[Code]...
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Apr 15, 2008
I am using Windows XP and Visual Studio 2003 .NET in VB.
I have created a parameter query using data controls on a form. The SQL works when I paste it into MS Access (and set the values to those I type in the input form) it returns 3 records. In the VB form I only ever get the first matching record. By changing the input by sorting in different orders I still only get the first matching record ( a different one). If I alter my input so the first does not match but the second and third do match I get only the second. Why Don't I get the set of three?
<Code>
Part SQL:
'WHERE
' (Houses4Sale.HousesAskingPrice <= ?)
[Code].....
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Apr 22, 2012
I have a database with 3 tables: Student, Unavailability and Duty.The fields for Student are entered in a form I have. One of the fields in Unavailability is filled by a form, the other fields are an autonumber and a foreign key to the Student table.ow I want records in the Duty table to be created and automatically filled in depending on what the values of the fields are in the Student table.For example, If the Boarder field in the Student table is 'yes' then I want the Duty Number field in the Duty table to be '1', '3' and '4'. If it is 'no' then I want the value to be '2' and '5'. I recognize it will have to create several different records to incorporate the different duty numbers for each StudentID. Obviously this will require an if statement, however this is my first time implementing a database with my limited experience with programming and Visual Basic, so I don't know how to refer to the specific fields in a table and set the value of other fields depending on the data in other fields.
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Jun 5, 2011
am using sql 2005 and vb 2008.i need to compare dates and select matching records betweem a selected date range.say records between 11/13/2010 and 11/20/2010.e.thing is working ok except when it comes to selecting dates between 11/1/2010 and 11/9/2010.this is happening because when am retrieving the dates from database,its being retrieved in the format 11/01/2010 instead of 11/1/2010 and so it reports no records found,and knowing the limits of sql 2005 this is the only way i can retrieve the date. [code]
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Mar 27, 2012
I have this piece of code wich works perfectly when inserting records into one table using records from another table. My question is that now i need to create another table by using records from 3 other tables (tables are related). Can i use aliases on the column names, like on Oracle SqlPlus? How will be the syntax of the 'INSERT INTO SQL statement?
Dim MyConn As ADODB.Connection
Dim MyRecSet As ADODB.Recordset
Dim tmpSQL As String
MyConn = New ADODB.Connection
[code]....
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Mar 7, 2009
I hope someone can help me. I have an ATM machine connected to a server. A form takes a textBox entry as a PIN number and matches it to a card number in the same table which is the primary key. The card number is in a comboBox.Selected Item. I have used a dataset to fill the comboBox as the form loads. I have tried for days and got nowhere.
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Apr 22, 2010
For a project i am working on, i am taking bookings. These bookings are stored in a database alongside a users personal details. The personal details are assigned an ID according to the user who booked it. A user can book more than once with different personal details.
My problem is that i want a user to be able to edit a booking. I want a list of all the names that user booked to be listed in a combo box. This is the part i am having trouble with. i am using an access database and using sql statements to pull out the data. This is what i have tried so far:
SELECT [First Name]
FROM PersonalDetails
GROUP BY [First Name], UserID
HAVING (UserID = ?)
If i execute this query in the query editor, it works and shows the two records currently assigned the input id. However, if i try to output this to, for example, a text box, then it remains blank. I am assuming thisis because there is more than one output, but i'm not sure.
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Mar 27, 2012
I do this in Oracle databases just in a snap, but now I have to do it in VB using ADODB and I don't know how to do it.
I have two Access 2007 tables. Table A contains: Col1 (text), Col2 (text), Col3(date), Col4(amount), Col5(text)
Table B contains Col1(date), Col2(amount) What I need to do is to insert into table B the records of table A (col4 summed) grouped by date of table A. The date is a variable contained in a text box so it cannot be hardcoded into the SQL statement.
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Mar 9, 2009
I have to create dinamcly a Table ( not a DataTable) and I need to write the Functions in other class... so I need to create a function that Returns a Table to make possible I just atribuite the Table to my <asp:Table> control.
[Code]...
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Jul 19, 2010
I have created a strongly typed dataset in the VS 2005 Dataset Designer. There are two tables that relates to each other in a one to many relationship: Claim and ClaimDetail. The designer automatically creates a function GetClaimDetailRows which returns all ClaimDetailRows for a ClaimRow. Why is this Array's length always 0? Because ClaimDetail contains more than 40 Million rows, i did'nt fill it before i call GetClaimDetailRows but had configured it's selectcommand that it takes a parameter idData to fill only the related records. But that seems not to work because the ClaimDetail-Datatable is empty.
The automatically generated function in the ClaimRow-Class which returns all related ClaimDetailRows:
Public Function GetClaimDetailRows() As ClaimDetailRow()
If (Me.Table.ChildRelations("Claim_ClaimDetail") Is Nothing) Then
Return New ClaimDetailRow(-1) {}
Else
Return CType(MyBase.GetChildRows(Me.Table.ChildRelations("Claim_ClaimDetail")),ClaimDetailRow())
End If
End Function
When debugging I see that it jumps into the else block but returns 0 rows. Do I have to fill the Claimdetail-Datatable first(ClearBeforeFill=True) for each Claim? But then I don't need to use this function anymore. I now fill the Datatable(ClearBeforeFill=True)before i call the Child-function and it works. But I don't understand why it could not throw an exception(optionally) when I try to acess a child-relation without having that datatable being filled(at least with 0 rows). Instead of that it returns 0 rows what can be correct or incorrect and is difficult to detect.
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Apr 12, 2010
Why MS Access adodb in .NET returns 34 in fieldcount when table has 42 fields ?I see 42 fields in table of my MS Access mdb database. But ADODB layer in .NET sees only 34 fields. The Outofrange exception occures when I am calling method getOrdinal("FieldName") of reader class.
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Jul 28, 2011
I am working on a front-end application program and cannot figure out what is giving me this error. The program is accessing an Access Database and filling a text box on the form. The error i keep receiving is "Index out of range", "No row at position 0". I have information in the data table, and when I type the select statement into a query in Access, it returns the information in the data table.[code]...
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Jun 12, 2011
just wondering how do i transfer table's records to another table??i'm wondering where do i put the queries, or am i gonna put it in my stored proc?
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Jun 11, 2011
I have 2 tables one is called Product Table and the other is called item table the item table is in gridview I can get the product primary key into the itemtable using a comb box but how do i read the rest of the information for that record into the item table from the product table.
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Mar 17, 2011
I'm using VB.net 2008 and I just want to know the syntax or the command that gets the number of records in a table.I saw numerous syntax on the net like this
count = " SELECT count (*) FROM payroll_table "
but it doesn't work for me.
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Mar 6, 2009
I try to delete all record in a table (.mdb msaccess) and I have the next code:
Me.Validate()
Me.Db1DataSet.Tables("tabl").Clear()
Me.TablAdapter.Update(Me.Db1DataSet.Tables("tabl"))
Me.Db1DataSet.AcceptChanges()...
But this don't change my table...
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Jun 8, 2011
a.Create a database named "techdb" and create a table as "Personal" with Employee No, Name , Age & Salary
b.Insert 2 records to the table
c.Design a form in VB.NET e to Add, delete and Update records
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Feb 21, 2011
I am a asp.net convert to VB.net and very new to VB.net(visual studio) I am trying to insert some records int a table. It seems the same code in asp.net does not work in VB.net. Here is an example of what I am trying to do
Dim Conn as New SqlClient.SqlConnection
Dim cmd as Ne SqlClient.SqlCommand
Conn.ConnectionString = "Data Soure......yada yada yada..."
[Code]....
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Nov 23, 2009
I'm getting an exception error when trying to insert a record to a SQL table in VB.NET. Following is my insert command.
cmd.CommandText = "INSERT INTO RunnerDB VALUES ('" & txtLast.Text & "', '" & txtFirst.Text & "', '" & txtMiddle.Text & "', '" & txtAddr1.Text & "', '" & txtAddr2.Text & "', '" & txtCity.Text & "', '" & cmbState.SelectedValue & "', '" & Integer.Parse(txtZip.Text)
[Code] ......
cmd.ExecuteNonQuery()
I am getting the error on the cmd.ExecuteNonQuery()...it says: Syntax Error near ','. I can't find the problem.
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Jun 9, 2011
im working on views that can help me navigate through records in a table. i have managed to execute an sql string to select the table i.e "select * from Users".i however want to build a "Previous" and "Next" command on the view but im mixed up on the navigation [code] Now all i need is code for going forward or backwards to a record.
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Mar 30, 2010
I want to return the top 5 records of a table in a dataset for datagrid view. The following does not work.
DataGridView.DataSource = DS.Tables("TABLENAME").Select("SELECT TOP 5")
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Mar 1, 2011
Programmatically using vb.net, could we export all records of a sql table into a txt file at once?
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Mar 27, 2009
copying some record from a table in the same table,changing only the fields of the data(month);- copy last month record fields, and the new records have to date, last month+1(actualy month);- i wish to be a button, like update or copy, to do this;- new filds are added every month;- how i do that?
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Apr 8, 2012
i have a datagridview with (a lot of) rows. With a click of a button I add them into a table. Everything works fine. I want to create a log of the records that have been added into the table.
[Code]...
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Apr 1, 2009
Is it possible to have a quick and easy way of retrieving the last 10 records from a table?
Currently what I have been doing is retrieving all the records then one-by-one cylcing through each record until I have the last 10. To me this seems to have a lot of over-head reading each record. I just wondered if there was a quicker way of doing it.
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Jun 12, 2012
I'm trying to connect foxpro table (dbf) to VB.NET. I'm trying to display the records of that table to listview in VB.NET. Here is my
I got an error message here, the error says "cannot open the file"
vb.net
Imports System.Data.SqlClient
Imports System.Data.OleDb
Public Class Form3
[Code].....
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Jun 9, 2011
Relatively new to VB.NET coding. Am creating a pretty simple console application that needs to insert over 50,000 records into an Oracle table (OleDB connection). I tried 3 different methods so far: Individual INSERT, insert using a dataset, & using INSERT ALL (commit every 25 records due to # of columns). It seemed like most articles/posts I read recommended the dataset approach, but the INSERT ALL code was definitely the fastest by far.
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Feb 1, 2010
I would like to insert records a user selects from a gridview using check box column here is my code which inserts the first record then on the second interation it gives the error."The variable name '@Customer' has already been declared. Variable names must be unique within a query batch or stored procedure." [code]
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Apr 20, 2010
I want to iterate through the records in an SQLCompact 3.5 data table and combine the field values into a string.The database file is connected to the project.I created a dataset that contains the tables from the database.If I drag and drop any datasource table as a grid onto a form I can view the data.[code]I have tried using the tableadapter.Ran into errors when the Date2 value = DBNull, never could get around those.I've tried dataview and datareader on the dataset.datatable but never could get these to load any data rows.I could sure use an uncomplicated unconvoluted way to simply read the rows of data in a database datatable.
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