pg - Upsert in Postgres Ruby -

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i have seen other questions deal issue , know postgresql doesn't have inbuilt upsert , must done using 2 methods. code i'm using in ruby using pg gem.

@db.exec_params("update crawled set url = $1, timestamp = $2 url = $1",[url,datetime.now])  @db.exec_params("insert crawled (url, timestamp) values ($1, $2) not exists                (select 1 crawled url = $1)",[url,datetime.now])

however when run syntax error 

exec_params': error:  syntax error @ or near "where" (pg::error) line 1: ...ert crawled (url, timestamp) values ($1, $2) not ...

where mistake?

just looking @ example have 2 questions.

  1. which of lines causing error?

  2. table should have been replaced table-name, shouldnt it? http://www.postgresql.org/docs/8.2/static/sql-insert.html


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