class Sequel::Postgres::Adapter

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

Constants

CONNECTION_OK

Make postgres-pr look like pg

DISCONNECT_ERROR_CLASSES

The underlying exception classes to reraise as disconnect errors instead of regular database errors.

DISCONNECT_ERROR_RE

Since exception class based disconnect checking may not work, also trying parsing the exception message to look for disconnect errors.

Public Instance Methods

async_exec(sql) click to toggle source
   # File lib/sequel/adapters/postgres.rb
91 def async_exec(sql)
92   PGresult.new(@conn.query(sql))
93 end
block(timeout=nil) click to toggle source
   # File lib/sequel/adapters/postgres.rb
95 def block(timeout=nil)
96 end
check_disconnect_errors() { || ... } click to toggle source

Raise a Sequel::DatabaseDisconnectError if a one of the disconnect error classes is raised, or a PGError is raised and the connection status cannot be determined or it is not OK.

    # File lib/sequel/adapters/postgres.rb
114 def check_disconnect_errors
115   begin
116     yield
117   rescue *DISCONNECT_ERROR_CLASSES => e
118     disconnect = true
119     raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError))
120   rescue PGError => e
121     disconnect = false
122     begin
123       s = status
124     rescue PGError
125       disconnect = true
126     end
127     status_ok = (s == Adapter::CONNECTION_OK)
128     disconnect ||= !status_ok
129     disconnect ||= e.message =~ DISCONNECT_ERROR_RE
130     disconnect ? raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)) : raise
131   ensure
132     block if status_ok && !disconnect
133   end
134 end
escape_bytea(str) click to toggle source

Escape bytea values. Uses historical format instead of hex format for maximum compatibility.

   # File lib/sequel/adapters/postgres.rb
79 def escape_bytea(str)
80   str.gsub(/[\000-\037\047\134\177-\377]/n){|b| "\\#{sprintf('%o', b.each_byte{|x| break x}).rjust(3, '0')}"}
81 end
escape_string(str) click to toggle source

Escape strings by doubling apostrophes. This only works if standard conforming strings are used.

   # File lib/sequel/adapters/postgres.rb
85 def escape_string(str)
86   str.gsub("'", "''")
87 end
execute(sql, args=nil) { |q| ... } click to toggle source

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

    # File lib/sequel/adapters/postgres.rb
138 def execute(sql, args=nil)
139   args = args.map{|v| @db.bound_variable_arg(v, self)} if args
140   q = check_disconnect_errors{execute_query(sql, args)}
141   begin
142     block_given? ? yield(q) : q.cmd_tuples
143   ensure
144     q.clear if q && q.respond_to?(:clear)
145   end
146 end
status() click to toggle source
    # File lib/sequel/adapters/postgres.rb
 98 def status
 99   CONNECTION_OK
100 end

Private Instance Methods

execute_query(sql, args) click to toggle source

Return the PGResult containing the query results.

    # File lib/sequel/adapters/postgres.rb
151 def execute_query(sql, args)
152   @db.log_connection_yield(sql, self, args){args ? async_exec(sql, args) : async_exec(sql)}
153 end