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
85 def async_exec(sql)
86   PGresult.new(@conn.query(sql))
87 end
block(timeout=nil) click to toggle source
   # File lib/sequel/adapters/postgres.rb
89 def block(timeout=nil)
90 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
108 def check_disconnect_errors
109   begin
110     yield
111   rescue *DISCONNECT_ERROR_CLASSES => e
112     disconnect = true
113     raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError))
114   rescue PGError => e
115     disconnect = false
116     begin
117       s = status
118     rescue PGError
119       disconnect = true
120     end
121     status_ok = (s == Adapter::CONNECTION_OK)
122     disconnect ||= !status_ok
123     disconnect ||= e.message =~ DISCONNECT_ERROR_RE
124     disconnect ? raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)) : raise
125   ensure
126     block if status_ok && !disconnect
127   end
128 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
73 def escape_bytea(str)
74   str.gsub(/[\000-\037\047\134\177-\377]/n){|b| "\\#{sprintf('%o', b.each_byte{|x| break x}).rjust(3, '0')}"}
75 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
79 def escape_string(str)
80   str.gsub("'", "''")
81 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
132 def execute(sql, args=nil)
133   args = args.map{|v| @db.bound_variable_arg(v, self)} if args
134   q = check_disconnect_errors{execute_query(sql, args)}
135   begin
136     block_given? ? yield(q) : q.cmd_tuples
137   ensure
138     q.clear if q && q.respond_to?(:clear)
139   end
140 end
status() click to toggle source
   # File lib/sequel/adapters/postgres.rb
92 def status
93   CONNECTION_OK
94 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
145 def execute_query(sql, args)
146   @db.log_connection_yield(sql, self, args){args ? async_exec(sql, args) : async_exec(sql)}
147 end