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Add/Update/Delete Record in VB.NET

Posted on 2008-10-23
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Last Modified: 2012-08-13
How do I Add/update a record in VB.NET for a table that does not have a primary key ? I want to update the record without using the SqlCommand.
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Question by:msbhatt1
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Expert Comment

by:UnifiedIS
ID: 22787876
Do you mean without using the sqlcommandbuilder?  You can set your insert/update SQL as the sqlcommand.text and then use sqlcommand.exectuenonquery to send it to your database.
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graye earned 250 total points
ID: 22798889
That's gonna be tough...   Using just the normal ADO.Net, you can perform an Insert into a table without a primary key, but you'd need a primary key to identify the desired row in order to perform an Update or Delete operation on that row.  Recall that ADO.Net inherently uses a "disconnected model" (which is the part of the puzzle that requires a primary key).
An easy alternative would be to use the older "classic" ADO... since it's "connected" model has no such requirement for a primary key.
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Assisted Solution

by:Mezillinu
Mezillinu earned 250 total points
ID: 22916113
Hi, the following are examples, on how to INSERT, UPDATE and DELETE using SQL from VB. NET

When deleting, or updating, you can use names, but it is not the recommended way of updating and deleting. the recommended way is to have an ID which is unique. in names, you can have duplicates, which could lead of you deleting not the intended one.

so for future practise, its better to stick to primary keys with unique ID's, so you use them when updating and deleting.

cheers
ADDING
 

 Try

            Dim SQL_Connection As New SqlClient.SqlConnection

            Dim SQL_Command As New SqlClient.SqlCommand

            Dim sSQL_Command As String = ""
 

            Dim tools As New Tools

            Dim databaseConnectionString As String = tools.getXmlValue("DBConnStringErrorHandlingException")

            SQL_Command.Connection.ConnectionString = databaseConnectionString
 

            'create the insert 

            sSQL_Command = "INSERT INTO tbl_EmailTemplates ( " & _

                           "     [TemplateName]        " & _

                           "   , [TemplateDescription]        " & _

                           "   , [TemplateContent]          " & _

                           ") " & _

                           "VALUES ( " & _

                           "     @TemplateName        " & _

                           "   , @TemplateDescription        " & _

                           "   , @TemplateContent          " & _

                                                ")"
 

            With SQL_Command

                .Parameters.AddWithValue("@TemplateName", Me.txtTemplateName.Text)

                .Parameters.AddWithValue("@TemplateDescription", Me.txtDescription.Text)

                .Parameters.AddWithValue("@TemplateContent", Me.htmlEmailTemplateEditor.Value.ToString)

                .CommandText = sSQL_Command

            End With
 

            SQL_Connection.Open()

            SQL_Command.ExecuteNonQuery()

            SQL_Connection.Close()

        Catch ex As Exception

            Me.lblStatus.Text = ex.Message

        End Try

        
 

DELETING - USING OLE DB, CHANGE AS ABOVE
 

Try
 

                Dim SQL_Connection As New OleDbConnection

                Dim SQL_Command As New OleDbCommand

                Dim sSQL_Command As String = ""
 

                Dim tools As New Tools

                Dim databaseConnectionString As String = tools.getXmlValue("DBConnStringErrorHandlingException")

                SQL_Connection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & databaseConnectionString

                SQL_Command.Connection = SQL_Connection
 

                'create the insert 

                sSQL_Command = "delete from tbl_emailTemplates where templatename = @templatename"
 

                With SQL_Command

                    .Parameters.AddWithValue("@TemplateName", Me.txtTemplateName.Text)

                    .CommandText = sSQL_Command

                End With
 

                SQL_Connection.Open()

                SQL_Command.ExecuteNonQuery()

                SQL_Connection.Close()

                refreshApp()

            Catch ex As Exception

                Me.lblStatus.Text = ex.Message

            End Try
 

UPDATING - ALSO USING OLE DB, CHANGE AS SQL CLIENT'S SQLCOMMAND AND SO ON
 

 Try

            Dim SQL_Connection As New OleDbConnection

            Dim SQL_Command As New OleDbCommand

            Dim sSQL_Command As String = ""
 

            Dim tools As New Tools

            Dim databaseConnectionString As String = tools.getXmlValue("DBConnStringErrorHandlingException")

            SQL_Connection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & databaseConnectionString

            SQL_Command.Connection = SQL_Connection
 

            'create the insert 

            sSQL_Command = "update tbl_EmailTemplates " & _

                           "  set TemplateContent = @templatecontent " & _

                           " where TemplateName = @templatename"
 

            With SQL_Command

                .Parameters.AddWithValue("@TemplateName", Me.txtTemplateName.Text)

                .Parameters.AddWithValue("@TemplateContent", Me.htmlEmailTemplateEditor.Value.ToString)

                .CommandText = sSQL_Command

            End With
 

            SQL_Connection.Open()

            SQL_Command.ExecuteNonQuery()

            SQL_Connection.Close()
 

            SQL_Command.Dispose()

            SQL_Connection.Dispose()

        Catch ex As Exception

            Me.lblStatus.Text = ex.Message
 

        End Try

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Expert Comment

by:Mezillinu
ID: 22916118
note that in the above examples, the only one using SQL, is the first insertion, so you have to convert the ole db command to sql, like in the first example.

its not so hard, you should cope :-)
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