I'm trying to export a database table to a file using the latest trunk
version of Rhino.Etl and although the file is generated correctly I am
getting the following exception:
19:49:19.904 Rhino.Etl.Core.Pipelines.ThreadPoolPipelineExecuter:
Failed to execute operation writefile.WriteCustomersToFile
System.InvalidOperationException: Null enuerator detected, are you
trying to read from the first operation in the process?
at Rhino.Commons.Guard.Against(Boolean assertion, String message)
at
Rhino.Etl.Core.Enumerables.EventRaisingEnumerator.System.Collections.Generic.IEnumerable<Rhino.Etl.Core.Row>.GetEnumerator()
at
Rhino.Etl.Core.Enumerables.EventRaisingEnumerator.GetEnumerator()
at
Rhino.Etl.Core.Pipelines.ThreadPoolPipelineExecuter.<>c__DisplayClass1.<DecorateEnumerable>b__0(Object)
Here is my etl file:
import System
import FileHelpers
import Rhino.Etl.Core.Files
[DelimitedRecord("\t")]
class Customer:
CustomerID as String
CompanyName as String
ContactName as String
ContactTitle as String
Address as String
City as String
Region as String
PostalCode as String
Country as String
Phone as String
Fax as String
operation WriteCustomersToFile:
engine as FluentFile = FluentFile.For[of Customer]()
engine.HeaderText = "Id\tCompanyName\tContactName"
using file = engine.To("export.txt"):
for row as Row in rows:
cust = row.ToObject[of Customer]()
file.Write(cust)
process ExportCustomers:
input "Northwind", Command = "SELECT * FROM Customers"
WriteCustomersToFile()
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