Class: Sequel::Postgres::Adapter

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

Overview

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#prepared_statements ⇒ Object (readonly)

Hash of prepared statements for this connection. Keys are string names of the server side prepared statement, and values are SQL strings.



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# File 'lib/sequel/adapters/postgres.rb', line 127

def prepared_statements
  @prepared_statements
end

Instance Method Details

#apply_connection_settings ⇒ Object

Apply connection settings for this connection. Current sets the date style to ISO in order make Date object creation in ruby faster, if Postgres.use_iso_date_format is true.



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# File 'lib/sequel/adapters/postgres.rb', line 132

def apply_connection_settings
  super
  if Postgres.use_iso_date_format
    sql = "SET DateStyle = 'ISO'"
    @db.log_info(sql)
    execute(sql)
  end
  @prepared_statements = {} if SEQUEL_POSTGRES_USES_PG
end

#execute(sql, args = nil) ⇒ Object

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 144

def execute(sql, args=nil)
  q = nil
  begin
    q = args ? async_exec(sql, args) : async_exec(sql)
  rescue PGError => e
    begin
      s = status
    rescue PGError
      raise Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)
    end
    status_ok = (s == Adapter::CONNECTION_OK)
    status_ok ? raise : Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)
  ensure
    block if status_ok
  end
  begin
    block_given? ? yield(q) : q.cmd_tuples
  ensure
    q.clear
  end
end