“Violation of PRIMARY KEY constraint 'PK_Vehicle_Transactions'. Cannot insert duplicate key in object 'dbo.Vehicle_Transactions”

Question

There\'s Webservice api that I design, Each time I push data cross the webservice this is what I get in return MOV = \"Violation of PRIMARY KEY constraint \'PK_Vehicle_Transacti

Answer 1

The exception already says it: Violation of PRIMARY KEY constraint 'PK_Vehicle_Transactions'. The table already contains a row with the Primary Key (TransactionID) given. A Primary Key is unique throughout the table.

There are several solutions for your problem:

1) Calculate the latest TransactionID

VT = New Statn_Sync.DataSetTableAdapters.Vehicle_TransactionsTableAdapter().GetData()

//Use query to select Max value of TransactionID (something like)
Dim maxPK as Long =  'SELECT MAX(TransactionID) FROM dbo.Vehicle_Transactions'  

//Increase the MaxPK with 1 to avoid duplicate key
 maxPK = maxPK + 1 

  For Each dr As DataRow In VT.Rows
   Dim iCount As Integer = 0

   //Use our variable in the insert
   Dim MOV As String = comT.insertVehicle_Transaction((maxPK  + iCount), _
                       Convert.ToDateTime(dr("Transaction_date")), _

2) Use Auto Increment on TransactionID of dbo.Vehicle_Transactions

For this i refer to the following post: Auto Increment .This post was made for the management studio of MSSQL 2012. But the same logic applies for earlier version (2008,2005)

Other solutions might be found throughout StackOverflow

If i can be of any further assistance, don't hesitate to give me sign!

Note: If the previous data are of no use to you, you can always clear the table prior to the insert using the query: DELETE FROM dbo.Vehicle_Transactionsthis query removes all rows from the table. Though you have to wary for any Forgein Keys as they might cause dataloss/exceptions.