Module: Sequel::Postgres

Defined in:

lib/sequel/adapters/shared/postgres.rb,
lib/sequel/adapters/postgres.rb,
lib/sequel/extensions/pg_array.rb,
lib/sequel/extensions/pg_hstore.rb,
lib/sequel/extensions/pg_array_ops.rb,
lib/sequel/extensions/pg_hstore_ops.rb,
lib/sequel/extensions/pg_statement_cache.rb,
lib/sequel/extensions/pg_auto_parameterize.rb

Overview

Top level module for holding all PostgreSQL-related modules and classes for Sequel. There are a few module level accessors that are added via metaprogramming. These are:

• client_min_messages (only available when using the native adapter) - Change the minimum level of messages that PostgreSQL will send to the the client. The PostgreSQL default is NOTICE, the Sequel default is WARNING. Set to nil to not change the server default.

• force_standard_strings - Set to false to not force the use of standard strings

• use_iso_date_format (only available when using the native adapter) - Set to false to not change the date format to ISO. This disables one of Sequel’s optimizations.

Changes in these settings only affect future connections. To make sure that they are applied, they should generally be called right after the Database object is instantiated and before a connection is actually made. For example, to use whatever the server defaults are:

DB = Sequel.postgres(...)
Sequel::Postgres.client_min_messages = nil
Sequel::Postgres.force_standard_strings = false
Sequel::Postgres.use_iso_date_format = false
# A connection to the server is not made until here
DB[:t].all

The reason they can’t be done earlier is that the Sequel::Postgres module is not loaded until a Database object which uses PostgreSQL is created.

Defined Under Namespace

Modules: ArrayOpMethods, AutoParameterize, DatabaseMethods, DatasetMethods, HStoreOpMethods, StatementCache Classes: Adapter, ArrayOp, Database, Dataset, HStore, HStoreOp, PGArray, PGDecimalArray, PGFloatArray, PGIntegerArray, PGNumericArray, PGStringArray

Constant Summary

NAN =

0.0/0.0

PLUS_INFINITY =

1.0/0.0

MINUS_INFINITY =

-1.0/0.0

NAN_STR =

'NaN'.freeze

PLUS_INFINITY_STR =

'Infinity'.freeze

MINUS_INFINITY_STR =

'-Infinity'.freeze

TRUE_STR =

't'.freeze

DASH_STR =

'-'.freeze

TYPE_TRANSLATOR =

tt = Class.new do
  def boolean(s) s == TRUE_STR end
  def bytea(s) ::Sequel::SQL::Blob.new(Adapter.unescape_bytea(s)) end
  def integer(s) s.to_i end
  def float(s) 
    case s
    when NAN_STR
      NAN
    when PLUS_INFINITY_STR
      PLUS_INFINITY
    when MINUS_INFINITY_STR
      MINUS_INFINITY
    else
      s.to_f 
    end
  end
  def date(s) ::Date.new(*s.split(DASH_STR).map{|x| x.to_i}) end
end.new

PG_NAMED_TYPES =

Hash with type name strings/symbols and callable values for converting PostgreSQL types. Non-builtin types that don’t have fixed numbers should use this to register conversion procs.

{}

PG_TYPES =

Hash with integer keys and callable values for converting PostgreSQL types.

{}

CONVERTED_EXCEPTIONS =

Array of exceptions that need to be converted. JDBC uses NativeExceptions, the native adapter uses PGError.

[]

Class Attribute Summary

• .client_min_messages ⇒ Object

  By default, Sequel sets the minimum level of log messages sent to the client to WARNING, where PostgreSQL uses a default of NOTICE.

• .force_standard_strings ⇒ Object

  By default, Sequel forces the use of standard strings, so that ‘\’ is interpreted as \ and not .

• .use_iso_date_format ⇒ Object

  As an optimization, Sequel sets the date style to ISO, so that PostgreSQL provides the date in a known format that Sequel can parse faster.

Class Attribute Details

.client_min_messages ⇒ Object

By default, Sequel sets the minimum level of log messages sent to the client to WARNING, where PostgreSQL uses a default of NOTICE. This is to avoid a lot of mostly useless messages when running migrations, such as a couple of lines for every serial primary key field.

# File 'lib/sequel/adapters/shared/postgres.rb', line 43

def client_min_messages
  @client_min_messages
end

.force_standard_strings ⇒ Object

By default, Sequel forces the use of standard strings, so that ‘\’ is interpreted as \ and not . While PostgreSQL <9.1 defaults to interpreting plain strings, newer versions use standard strings by default. Sequel assumes that SQL standard strings will be used. Setting this to false means Sequel will use the database’s default.

# File 'lib/sequel/adapters/shared/postgres.rb', line 50

def force_standard_strings
  @force_standard_strings
end

.use_iso_date_format ⇒ Object

As an optimization, Sequel sets the date style to ISO, so that PostgreSQL provides the date in a known format that Sequel can parse faster. This can be turned off if you require a date style other than ISO.

# File 'lib/sequel/adapters/postgres.rb', line 142

def use_iso_date_format
  @use_iso_date_format
end