I wanted to update an entity with LLGLGen Pro by executing the adapter.SaveEntity() method and got an exception.
An exception was caught during the execution of an action query: Cannot insert duplicate key row in object ‘dbo.Customer’ with unique index ‘UniqueApi’.
The statement has been terminated.. Check InnerException, QueryExecuted and Parameters of this exception to examine the cause of this exception.
This was caused by an unique constraint on a column ApiKey, but I was updating an existing “Customer” entity and the value for the “ApiKey”, was unique, but I forgot to set the IsNew property on the “Customer” entity to false. So LLGLGen wanted to insert a new record instead of updating the existing record.
By setting the “IsNew” property on the “Customer” entity to false, the exception was resolved.