im connect the database using the OLEDB, how to write the code when the user types '02' in textbox1, 'myname' in textbox2 and 'myqty' in textbox3, if database table itemcode field same with textbox1 then will only update the textbox2 and textbox3 in other field, if it does not exist then create the new record.
View 5 RepliesI want to update a date field in my table when a record is updated to reflect when the last update was made. I have this for the parameter: objEXTCommand.Parameters.AddWithValue("@entryDate", Now.Date)
However, this inserts the Date and a time of "12:00:00". I want the date and current system time. I've gone about several ways, but none seem to work. I try this: [Code]
I try to find online any example for create an application autoupdate.
When I run my application it check in a webserver if exist new version,if exist the software run update.
While I've previously many years of relational databases and procedural languages, I'm stumbling with Visual Basic. In this problem, the simple situation is that I have two files, parent and child. The primary key of the parent file (Area file) is linked by a relation to one of the two fields that makes up the primary key in the child file (Project file) (unique key is formed from 'area' and 'project'). I have the default table adapters created on both files. I have created two maintenance forms showing one each of the two files in datagrid view format.I can create some records in the Parent (Area) file, but when I try to create a record in the child (Project) file, using one of the valid key values from the Area file, I get the 'ForeignKeyConstraint [relation name] requires the child key values [actual value] to exist in the parent table' which I'm absolutely definitely sure it does.
I haven't done any actual coding for those two maintenance forms, just dragged-and-dropped the files from the data sources screen onto separate forms so it creates the controls itself. But I can't work out, if it already knows the data does exist because I can load it back in to the Area maintence form, why it can't check itself to find out the record does exist. Why does it think the record from the parent record doesn't exist? It does exactly the same thing, whether or not the database is in access or SQL Server Express. I have all the latest updates.
I hav a web service which pull records from a database and I am hosting these services in IIS which works fine but I am trying to retrieve the record and display the record in a listbox displaying the time field as the text for that record.I have created the following function
public sub get_data()
dim dt as new data.dataTable
dim service as ws webservice.webservice
[code]...
Basically I just want to set up exceptions for my program to prevent errors. The problem I am having is that sometimes the field name does not exist. For example, I am setting focus to the username text field named simply "username". However, if the entry does not exist (name=username) then I get an error. So what I need is a simple if statement to determine if it exist beforehand.
If Webbrowser1.Document.All("username").Exist Then
WebBrowser1.Document.All("username").Focus()
else
Messagebox.show("Field was not found!")
End If
My tables are PURCHASE and SALES...In PURCHASE table, fields are CODE(primary key), PRICE, DATE, TOTAL, QTY...when I'm entering datas in form and when i click submit, the datas stored... but when i enter same DATA(CODE), it is showing error...i don't want to show the DEFAULT ERROR message...so, i want to search whether the CODE is already in database or not...i.e When i click SUBMIT button, 1st it has to search whether the CODE is already PRESENT in table or not. if it is not there, DATAS have to be stored. otherwise, it has to DISPLAY MESSAGE BOX.
View 4 RepliesIm using Microsoft Visual Studio 2010
Microsoft Acess 2010
This is for practice
Lets See First off i was able to get to insert records(Code Below)Now im trying to get the program to prompt a message when the id or field exists on the key down event and not enter it if it exists and if it doesnt exist im guessing i could use my already existing code to insert it[code].............
Mine is a simple conexion problem but I dont understands what's happening I have another form in the same project which has no problems at all, I desided to create a form to use it as a base form named plantillav only to duplicate forms and intance the others from that one I put it's Modifiers Property = Protected in ortder to modify property values in the other ones I don't know if the process generated a failure.
I created the following strconn:
Public
Class
clientesc
[CODE]...
This table was exported from phpmyadmin (wamp) so it means is created and even with registers inserted directly from console, the problem is when I send from the application, with the following error that indicates that the name of the field doesn't exist or is not well written; Unknown column 'code_empleado' in 'field list'.
There are lots of questions about this but I've not been able to solve my problem using the answers to any of them (after many, many attempts..)
I'm working in vb.net creating an asp.net web application. I have an SqlDataSource and a GridView on my page.
I want to change the DoNotMail boolean value represented by a Gridview checkbox and automatically update in the database if the checkbox is checked from 0 (False, Will Mail) to 1 (True, Won't Mail) here is the code I used. [code]...
is it possible to do a two way sync on the entire gridview when the user hits a button so you don't have to do an update every time a row is changed? because the user might check the box and then check another box then uncheck a box and it would be a lot of updates...
I need to check if a record exist in my sql server [code]...
I need to check if in "Br" exist a record for example "123098"
I want to insert records in the database but before it inserts, it must first check the database whether the value being inserted already exists. Now my problem is that I am unable to insert into the database even though the value still does not exist.
Here's my code:
Dim check As New SqlCommand
Dim sqlcheck As String = "SELECT SerialNumber FROM EquipmentDetail WHERE SerialNumber = '" & TextBox1.Text & "'"
connection.Open()
[code]....
In VB6 I used ADP to confirm record existence by using this script
IF ADO.EOF OR ADO.BOF then
ado.addnew
End if
but in VB.NET 2003, How before using SQL String to Insert the record how do I confirm it's existence in the Table to prevent duplication.
I am handling many of the BindingNavigator tasks (MoveFirst, MoveNext, etc.)in code to ensure that I always ask the User to save his changes.
The one area I am have a problem is PositionItem. I would like to sense that the User has changed the Record Number in the BindingNavigatorPositionItem, handle my record Update, and move to the Record Number the User entered I have looked all over and have not found any way to do this.
How to use this query to update record [code]....
View 1 RepliesI have used a data repeater, some of the data it repeats are URL's taken from the SQL DB. How can these link labels be made into links that will open the clicked URL in a browser?
I know i have to use the
System.Diagnostics.Process.Start("IExplore.exe",
url) command but i dont know how to get the URL from the current record.Is there an easy command to get a field from the current record?
I am trying to do a SQL query to see if an Address already exists in my database. My addresses are structure like this:
line1
line2
line3
city
state
zipcode
country
Sometimes line2 and line3 are NULL values in my database.I am using .NET TableAdapter and DataTable to make my query. When I try to pass in my line2 parameter (@line2) it is equal to a string with value = nothing. My database does not interpret this as NULL and says the records don't match, but I know they do? How do I pass in a string = nothing and have it compare to a NULL value in the database as being equal? I have tried string = DBNULL.value but won't compile.I have done similar comparisons with integers etc. using integer = Nullable (of integer) but this does not exist for strings.
I am using VB 2008 and SQL Server 2005. I have a texbox in which I need to show the field 'domain' from the table x. I am getting the field in the format needed from a stored procedure.Below is the Vb code that I am using in which I am getting an error message: Invalid attempt to read when no data is present.at this line sDomain = sDomain & " " & v_DR!Search
[Code]...
How may i retrieve the total number of records from a table via a SQL select, store it in a variable & in turn, add '1' to it @ a textbox to simulate the addition of a new record?[code]...
View 2 Repliesim fairly new to databases in vb.net and i have just learned how to use datagridview. im gonna show some of my code for the connection and datagridview display
Public Class Form1
Dim con As New OleDb.OleDbConnection
Dim dbProvider As String[code].....
i want to display in a textfield the first name based on where is the pointer is positioned after i clicked Button1, how do i do this?
How to delete a record or field from a fixed-width file in visual basic code?
View 1 RepliesI have made an app which has id and name and class and tel fields using sql2005 database I made ID field as primery key so when i delete record from table it doesnt rearange it self for example I added record number
1
2
3
4
[code]....
I am using database compact and i loaded it on my form and i want to update a single field but I cannot, why: what am doing is:
[Code]...
I am using Visual Studio 2005 (Visual Basic) and MS Access 2003 I am trying to build an application in the lines of the book "Doing Objects in Visual Basic 2005" by Deborah Kurata. So, I have a Data Access Layer (DAL) Class Library that is separated from the business logic layer (business objects) Class Library. I try to add a new business object such as a "Customer" to the Access Database, where the "Customer" table has a PrimaryKey "CustomerID" which is an AutoNumber field. I am successful in writing the values to the database, but I can't figure out how to know the "CustomerID" of a newly added "Customer" so I can populate the business object with the respective values.
View 4 RepliesI have a general ledger branch file mtn. form in vb 2008. I am using a datagrid that is bound to an sql 2008 table using a dataset. In the grid I am allowing the user to update 6 of the fields in the table. The table also has a date last changed field. Who do I get the date last changed field changed to the current date for only the rows in the grid that have changed?
View 1 RepliesI want to UPDATE 1 field in a row of data but I want to select that row based upon 2 other changeable fields. I can not get the changeable fields to work. When I put in a integer in place of the @field, it works but when I use any @field name of field name, it does not work. HELP HELP
This works::
cmd.CommandText =
"UPDATE [dbo].[Healing] SET [Printed] = 'NO' WHERE (([Row] = 1) AND ([Flag] = 1))"
ReturnA = cmd.ExecuteNonQuery()
[Code]...
Update a field in Db with year Only?
View 3 RepliesI am looping through a dataset. I want to update a field in each datarow.
How can I edit a row in a dataset? I tried this but it didn't work:
For each datarow as datarow in dataset.datatable.rows[code]...
I am accepting the amount value from the user. The amount would be added to the fees if the fee is in areas, if the fee is 0, then the amount update the fee field. but when the code below is run , only the amount is updated without adding to the arrears which is the fees. Wat is wrong with this command?
update Student_Info set Fees = (Fees + '" & Me.txtamount.Text & "' ) where Class = '" & Me.cbxClass.Text & "'"
would the decode command workd in vb.net
I have a database in access and have connected it to vb, its connected to a login system the only problem that comes up is when i want to add or update a field which then "da.Update(ds)" gives an error.
Update
Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Dim cb As New OleDb.OleDbCommandBuilder(da)
[Code].....