Warning Messagebox Appears When Deleting A Record Which Has A Foreign Key To Another Table?
Apr 24, 2009
I would like to have a pop up messagebox that asks users for confirmation before deleting a record in datagridview and if the record is a foreign key to another table, another messagebox will appear and warns users saying" before you can delete this record, make sure you remove all the related records" I have tried but I don't know how to complete it.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.StaffTableAdapter.Fill(Me.StaffDBDataSet.Staff)
BindingNavigator1.DeleteItem = Nothing
End Sub
Want to know how to create a exception handler if say you have a form that has a foregin key in it, how does one put an exception handler to prevent the operation of this producing a VB.NET Error when i want to delete a record?
I am leaning VB and have created a basic inventory app for work that consist of 4 tables, CurrentInventory, Surplus, Staff and Category. Each of these tables have a corresponding form. My question is with the CurrentInventory and Surplus form/tables. I want a button on the CurrentInventory Form that when clicked the current record would be transferred to the Surplus table and deleted from the CurrentInventory table.I am assuming that I could somehow use the INSERT command to copy the current record to the surplus table but I am not sure how to accomplish this.
I am trying to delete a record from a table by using dao recordset. Currently I am working with the code listed below. Unfortunately i've realised that this code only deletes the first record in my table, whereas I am looking to delete a record form the table with an ID that I would have put in textbox1
Private Sub btnDelete_Click(sender As System.Object, e As System.EventArgs) Handles btnDelete.Click Dim AccessEngine As New DBEngine Dim db As Database = AccessEngine.OpenDatabase(DatabasePath) Dim dbs As Microsoft.Office.Interop.Access.Dao.Recordset = db.OpenRecordset("myTable", RecordsetTypeEnum.dbOpenDynaset) dbs.Delete() End Sub
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.
Is there any way to change the sound MessageBox makes when it appears? I've written a Hangman game that displays a message box when a player wins, loses, hits an invalid key, or presses the same key twice and it always makes the same sound.
I'm working on this program to delete .tmp files that are older then 5 days. The only problem that im running into is if there are no files older than 5 days to display a messagebox "There are no .tmp files older than 5 days".
I have master detail form with two datagrids. customer and order detail.I have relationship between customer and order detail on customerid.How do i delete record from order detail when i click delete button to delete record from customer datagrid.Here is the code so far.
Private Sub btndelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndelete.Click 'Me.CustomerTableAdapter.Fill(Me.CustomerDataSet.Customer)
Is there a simple way that I can replace a foreign key in a datatable, with a corresponding value from the table that the key is referring to, without having to create a new table or use tableadapter? Ive got a table that has a foreign key to a child table, and I need to get a column from that table to fill a dataview?
I have an application where I need to be able to search for the workers related to a company from a contacts list. I am able to do this by entering the company number but I am unsure how I can set the query to allow to search for the information in the other table.
[Code]...
SELECT RecordNo, CompanyID, AccntRep, CustNumber, Person, SubjectID, StatusID FROM dbo.Contact WHERE CompanyID = @companyNo I think that I need to create a join in the SQL statement to the company table but am unsure how to go about this and I would be grateful if someone would give me a point in the right direction so that i can search for the company name instead of the companyID.
I'm trying to use a DataTable to get the schema of a SQL Server DB.But, when try to detect the ForeignKeys, the constraints collection only brings the UNIQUE constraints.
Private Sub ShowConstraints(ByVal tableName As String) Dim table As DataTable = New DataTable(tableName) Using connection As SqlConnection = New SqlConnection(GetConnectionString)
I have an Access database where I want to store the contacts in a company: In this database I have a table named "users" where I keep the users which will have access to the database. In the main table, named "contacts", two of my fields "insert_user" and "contact_user" refer to the user who entered the contact information and the user who actually made the contact. The way I am thinking it, I will have to set both of the fields as foreign keys to the same table/field, namely "users"/"username".
So: I set two foreign key constrains in two different fields ("insert_user", "contact_user"), which refer to the same table/field ("users"/"username") in an Access database, using VB.Net OleDB (See the SQL Statement below)
I open the database with MS-Access. I see that all the tables are fine (as they should be).
However when I click on relationships at Access I get all my tables plus a table named users_1 connected to "contacts"/"contact_user" (the table users is only connected to "contacts"/"insert_user")
It is very strange that in the Table View of Access I don't see this table, but only in the Relationships View.
Questions
Is my thinking right (to set 2 foreign keys, that refer to the same table/field)? What is this table "users_1"? Will my database work or am I doing something wrong?
On my form, I'm trying to display information about a grade. I'm using a DataSet with BindingSources and TableAdapters. Using the tip from here, I'm populating the selected grade's ID, HazardType_ID and Code. Unfortunately, I want to display the the HazardType, and not the foreign key index. I've accomplished this with the following
' get the data Dim data As ProjectDataSet.GradesRow = DirectCast(GradesBindingSource.Current, DataRowView).Row ' fill in form fields
[code]....
Note, I'm using VB Express 2008 (.NET 3.5) and connecting to a MS Access database.
I want to insert data into my tables. Table 1 (Recipes1) has a primary key (Autonumber) Table 2 (Ingredients) has a Foreign key with the same name as the primary key in Table2 ("RecipeNumber) this is a normal number field. The problem is that when i update the tables, it does not even make it past table1 , which should be ok.
I have 2 Tables , OrderDetails and Requests In my LINQ to SQL dbml file. OrderDetailsID is a foreign key in Requests Table.
I want to write the query to get the sum of UnitCost from OrderDetails based on OrderId. And If there is a row in Requests Table for each OrderDetailsID, and the Requests.Last.RequestType="Refund" I want to reduce the total refund amount from the main sum otherwise If there is no row based on OrderDetailsID, add to sum.
Here is the way I implement that. I am looking to prevent using "For each".
iRefund = (From od1 In dc.OrderDetails _ Where od1.OrderID =1 _ Select od1.UnitCost).Sum
I have 2 Tables , OrderDetails and Requests In my LINQ to SQL dbml file.OrderDetailsID is a foreign key in Requests Table.I want to write the query to get the sum of UnitCost from OrderDetails based on OrderId.And If there is a row in Requests Table for each rderDetailsID, and the Requests.Last.RequestType="Refund" I want to reduce the total refund amount from the main sum otherwise If there is no row based on OrderDetailsID, add to sum
I'm currently trying to create a function to parse error messages to make them more helpful for the end user. Currently I'm working with SQLServer and VB.NET.
Right now I'm raising error 547 which looks like this:
DELETE statement conflicted with COLUMN REFERENCE constraint Constraint Name. The conflict occurred in database 'Database Name', table 'Table Name',
[Code].....
I'm able to pull every piece of information I need from the error message except the name of the parentTable. I've already determined that the SqlException doesn't store the statement that caused the exception, and as far as I can tell it doesn't store information about the name of the parent table, only the table that is trying to reference it.
Is there an easy way to get the name of the parentTable?
I am using a number of tables on my application and two of which have a foreign key constraint I have set between them. When I change the account number on the main table via a combo box all of the relevant information for that table on the form is updated accordingly. However, the child table which has a foreign key reference to the Account Number of the main table is not updated when the acocunt number is changed. I have set the update to cascade in the references but still am having issues.
I have a form with a DataGridView binding to an Access database. Everything works fine and it populates perfectly. Except when I delete a record. I get the following. I found a few threads about the issue but I cannot resolve the issue. Can some one give me a step by step to resolve this. [Code]
i'm having a problem regarding sql deleteCommand..
here's my code Private Sub btnDeleteBC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDeleteBC.Click If MessageBox.Show("Do you really want to Delete this Record?", _
I'm using vb.net and I have connected a database to it. As per my interface I should add, delete, go back, go next and save my records. All the buttons work apart from delete. The problem is I do not know the codes for deleting a particular record during the run time, how to work with the codes and steps of deleting a particular record.
I can delete record but it only checks for the username.How bout for the password?Can I use
("delete from tblogin where username=('" & txtUsername.Text & "') AND password=('" & txtPassword.Text & "') ", sqlconn)
so that it can also validate the password?
Private Sub btnDeleteuser_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDeleteuser.Click sqlconn = New SqlConnection("server=CHERRIE-PC;Database=yss;integrated
in my visual basic 2008 express edition project I have 2 forms (paxreportfrm,paxsearchfrm).I want to give inputs in paxreportfrm and save the record(which is working fine).then in paxsearchfrm i want to search depending on multiple criteria (working ok).when i click on the record which is in gridview in the search form,opens up the paxreportfrm again with all the details of that specific record (working fine). Now i want to update the existing record which has been populated from the gridviw of the paxsearchfrm and also want to have the option to delete the record.I am using the datacontrols(wizard) to make connection with the access2007 database.can someone give me some example of how to do the Edit and delete in the database pls.I already have a save button on the paxreportfrm(if i click on that, after changing the details on existing record, it just saves IT as a new record).so i really need something which will actually save the modifications on the existing record AND ALSO WILL BE ABLE TO DELETE IT FROM THE database. I have tried couple of methods but none of them are working.
I have this problem : Dynamic SQL generation for the DeleteCommand is not supported against a SelectCommand that does not return any key column information.... the button used to delete record in my project is button6 at the end of the code
My code :
Public Class Form1 Dim con As New OleDb.OleDbConnection
I'm encountering a problem on how to delete a selected row in a datagrid. This error occurs, "Missing the DataColumn 'ID' for the SourceColumn 'ID'."[codde]
How can I ensure that the currently selected row ID in Parent Table automatically appears in my child form when I create a new row in the Child Form.I am using VB 2008 Express I have a Stored Procedure for the chiled table called "Files" can I do it from there:-
ALTER PROCEDURE dbo.CreateFile ( @FileName varchar(50), @DateCreated varchar(50),
I have two tables Products and Categories with a many to many relationship. I am trying to copy the categories linked to one product (OriginalProduct) to another product (newProduct). The problem is when I execute the SaveChanges() method, I not only get the records in my linking table, but it also creates another copy of the categories in the categories table. I've tried this in many ways but here are the last couple that I've attempted:
' Copy Product/Categories For Each oneProdCategory In OriginalProduct.Categories Dim relatedCategory = _productContext.GetObjectByKey(New EntityKey ("ProductInfoEntities.Categories", "RecordId", oneProdCategory.RecordId))
i have gridview 1 and textbox1 and button1 i want when pages load the gridview displays the all records from table1 and also ...i i wanna search record for firstname by typing sumit in textbox1 and click on button1 then in gridview the record of sumit will be shown ..by default gridview display alll records from table1 How to do this My Selct Query is below : but it doesnot display all record ...but it can display record if you search for a particular record .
