Class: Sequel::Postgres::Adapter

Inherits:
PGconn
  • Object
show all
Defined in:
lib/sequel/adapters/postgres.rb

Overview

PGconn subclass for connection specific methods used with the pg, postgres, or postgres-pr driver.

Constant Summary

DISCONNECT_ERROR_RE =
/\Acould not receive data from server/

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Instance Attribute Details

- (Object) prepared_statements (readonly)

Returns the value of attribute prepared_statements



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# File 'lib/sequel/adapters/postgres.rb', line 118

def prepared_statements
  @prepared_statements
end

Instance Method Details

- (Object) check_disconnect_errors

Raise a Sequel::DatabaseDisconnectError if a PGError is raised and the connection status cannot be determined or it is not OK.



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# File 'lib/sequel/adapters/postgres.rb', line 122

def check_disconnect_errors
  begin
    yield
  rescue PGError => e
    disconnect = false
    begin
      s = status
    rescue PGError
      disconnect = true
    end
    status_ok = (s == Adapter::CONNECTION_OK)
    disconnect ||= !status_ok
    disconnect ||= e.message =~ DISCONNECT_ERROR_RE
    disconnect ? raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)) : raise
  rescue IOError, Errno::EPIPE, Errno::ECONNRESET => e
    disconnect = true
    raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError))
  ensure
    block if status_ok && !disconnect
  end
end

- (Object) execute(sql, args = nil)

Execute the given SQL with this connection. If a block is given, yield the results, otherwise, return the number of changed rows.



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# File 'lib/sequel/adapters/postgres.rb', line 146

def execute(sql, args=nil)
  args = args.map{|v| @db.bound_variable_arg(v, self)} if args
  q = check_disconnect_errors{execute_query(sql, args)}
  begin
    block_given? ? yield(q) : q.cmd_tuples
  ensure
    q.clear if q && q.respond_to?(:clear)
  end
end