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   1 module ActiveRecord
   2   module ConnectionAdapters
   3     class PostgreSQLAdapter < AbstractAdapter
   4
   5       # This mightn't be in Core, but count(distinct x,y) doesn't work for me
   6       def supports_count_distinct? #:nodoc:
   7         false
   8       end
   9
  10       def concat(*columns)
  11         columns = columns.map { |c| "CAST(#{c} AS varchar)" }
  12         "(#{columns.join('||')})"
  13       end
  14
  15       # Executes an INSERT query and returns the new record's ID
  16       def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  17         # Extract the table from the insert sql. Yuck.
  18         table = sql.split(" ", 4)[2].gsub('"', '')
  19
  20         # Try an insert with 'returning id' if available (PG >= 8.2)
  21         if supports_insert_with_returning?
  22           pk, sequence_name = *pk_and_sequence_for(table) unless pk
  23           if pk
  24             quoted_pk = if pk.is_a?(Array)
  25                           pk.map { |col| quote_column_name(col) }.join(ID_SEP)
  26                         else
  27                           quote_column_name(pk)
  28                         end
  29             id = select_value("#{sql} RETURNING #{quoted_pk}")
  30             clear_query_cache
  31             return id
  32           end
  33         end
  34
  35         # Otherwise, insert then grab last_insert_id.
  36         if insert_id = super
  37           insert_id
  38         else
  39           # If neither pk nor sequence name is given, look them up.
  40           unless pk || sequence_name
  41             pk, sequence_name = *pk_and_sequence_for(table)
  42           end
  43
  44           # If a pk is given, fallback to default sequence name.
  45           # Don't fetch last insert id for a table without a pk.
  46           if pk && sequence_name ||= default_sequence_name(table, pk)
  47             last_insert_id(table, sequence_name)
  48           end
  49         end
  50       end
  51     end
  52   end
  53 end