Class Sequel::Adapter
In: lib/sequel/adapters/postgres.rb
Parent: ::PGconn

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

Methods

apply_connection_settings   check_disconnect_errors   execute  

Included Modules

Sequel::Postgres::AdapterMethods

Constants

DISCONNECT_ERROR_RE = /\Acould not receive data from server: Software caused connection abort/

Attributes

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

Public Instance methods

apply_connection_settings()

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.

[Source]

     # File lib/sequel/adapters/postgres.rb, line 148
148:       def apply_connection_settings
149:         super
150:         if Postgres.use_iso_date_format
151:           sql = "SET DateStyle = 'ISO'"
152:           execute(sql)
153:         end
154:         @prepared_statements = {} if SEQUEL_POSTGRES_USES_PG
155:       end
check_disconnect_errors() {|| ...}

Raise a Sequel::DatabaseDisconnectError if a PGError is raised and the connection status cannot be determined or it is not OK.

[Source]

     # File lib/sequel/adapters/postgres.rb, line 159
159:       def check_disconnect_errors
160:         begin
161:           yield
162:         rescue PGError =>e
163:           disconnect = false
164:           begin
165:             s = status
166:           rescue PGError
167:             disconnect = true
168:           end
169:           status_ok = (s == Adapter::CONNECTION_OK)
170:           disconnect ||= !status_ok
171:           disconnect ||= e.message =~ DISCONNECT_ERROR_RE
172:           disconnect ? raise(Sequel.convert_exception_class(e, Sequel::DatabaseDisconnectError)) : raise
173:         ensure
174:           block if status_ok
175:         end
176:       end
execute(sql, args=nil) {|q| ...}

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

[Source]

     # File lib/sequel/adapters/postgres.rb, line 180
180:       def execute(sql, args=nil)
181:         q = check_disconnect_errors{@db.log_yield(sql, args){args ? async_exec(sql, args) : async_exec(sql)}}
182:         begin
183:           block_given? ? yield(q) : q.cmd_tuples
184:         ensure
185:           q.clear if q
186:         end
187:       end

[Validate]