Class: DataObject::Postgres::Connection

Inherits:
Connection
  • Object
show all
Defined in:
lib/do_postgres.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection_string) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/do_postgres.rb', line 13

def initialize(connection_string)
  @state = STATE_CLOSED        
  @connection_string = connection_string
end

Instance Attribute Details

#db ⇒ Object (readonly)

Returns the value of attribute db.



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# File 'lib/do_postgres.rb', line 11

def db
  @db
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/do_postgres.rb', line 27

def close
  Postgres_c.PQfinish(@db)
  @state = STATE_CLOSED
  true
end

#create_command(text) ⇒ Object 



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# File 'lib/do_postgres.rb', line 33

def create_command(text)
  Command.new(self, text)
end

#open ⇒ Object 



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# File 'lib/do_postgres.rb', line 18

def open
  @db = Postgres_c.PQconnectdb(@connection_string)
  if Postgres_c.PQstatus(@db) != Postgres_c::CONNECTION_OK
    raise ConnectionFailed, "The connection with connection string #{@connection_string} failed\n#{Postgres_c.PQerrorMessage(@db)}"
  end
  @state = STATE_OPEN
  true
end