Class | Sequel::Postgres::Adapter |
In: |
lib/sequel/adapters/postgres.rb
|
Parent: | PGconn |
PGconn subclass for connection specific methods used with the pg or postgres-pr driver.
DISCONNECT_ERROR_CLASSES | = | [IOError, Errno::EPIPE, Errno::ECONNRESET] | The underlying exception classes to reraise as disconnect errors instead of regular database errors. | |
DISCONNECT_ERROR_RE | = | /\A#{Regexp.union(disconnect_errors)}/ | Since exception class based disconnect checking may not work, also trying parsing the exception message to look for disconnect errors. | |
CONNECTION_OK | = | -1 | Make postgres-pr look like pg |
close | -> | finish |
# File lib/sequel/adapters/postgres.rb, line 85 85: def async_exec(sql) 86: PGresult.new(@conn.query(sql)) 87: 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, line 108 108: 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, line 73 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, line 79 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, line 132 132: 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