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
# File lib/sequel/adapters/postgres.rb 85 def async_exec(sql) 86 PGresult.new(@conn.query(sql)) 87 end
# File lib/sequel/adapters/postgres.rb 89 def block(timeout=nil) 90 end
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 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 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 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
# File lib/sequel/adapters/postgres.rb 92 def status 93 CONNECTION_OK 94 end
Private Instance Methods
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