module Sequel::Postgres::DatabaseMethods

Constants

DATABASE_ERROR_REGEXPS
FOREIGN_KEY_LIST_ON_DELETE_MAP
MAX_DATE
MAX_TIMESTAMP
MIN_DATE
MIN_TIMESTAMP
ON_COMMIT
SELECT_CUSTOM_SEQUENCE_SQL

SQL fragment for custom sequences (ones not created by serial primary key), Returning the schema and literal form of the sequence name, by parsing the column defaults table.

SELECT_PK_SQL

SQL fragment for determining primary key column for the given table. Only returns the first primary key if the table has a composite primary key.

SELECT_SERIAL_SEQUENCE_SQL

SQL fragment for getting sequence associated with table’s primary key, assuming it was a serial primary key column.

TYPTYPE_METHOD_MAP
VALID_CLIENT_MIN_MESSAGES

Attributes

conversion_procs[R]

A hash of conversion procs, keyed by type integer (oid) and having callable values for the conversion proc for that type.

Public Instance Methods

add_conversion_proc(oid, callable=nil, &block) click to toggle source

Set a conversion proc for the given oid. The callable can be passed either as a argument or a block.

    # File lib/sequel/adapters/shared/postgres.rb
309 def add_conversion_proc(oid, callable=nil, &block)
310   conversion_procs[oid] = callable || block
311 end
add_named_conversion_proc(name, &block) click to toggle source

Add a conversion proc for a named type, using the given block. This should be used for types without fixed OIDs, which includes all types that are not included in a default PostgreSQL installation.

    # File lib/sequel/adapters/shared/postgres.rb
316 def add_named_conversion_proc(name, &block)
317   unless oid = from(:pg_type).where(:typtype=>['b', 'e'], :typname=>name.to_s).get(:oid)
318     raise Error, "No matching type in pg_type for #{name.inspect}"
319   end
320   add_conversion_proc(oid, block)
321 end
check_constraints(table) click to toggle source

A hash of metadata for CHECK constraints on the table. Keys are CHECK constraint name symbols. Values are hashes with the following keys:

:definition

An SQL fragment for the definition of the constraint

:columns

An array of column symbols for the columns referenced in the constraint, can be an empty array if the database cannot deteremine the column symbols.

    # File lib/sequel/adapters/shared/postgres.rb
332 def check_constraints(table)
333   m = output_identifier_meth
334 
335   hash = {}
336   _check_constraints_ds.where_each(:conrelid=>regclass_oid(table)) do |row|
337     constraint = m.call(row[:constraint])
338     entry = hash[constraint] ||= {:definition=>row[:definition], :columns=>[]}
339     entry[:columns] << m.call(row[:column]) if row[:column]
340   end
341   
342   hash
343 end
commit_prepared_transaction(transaction_id, opts=OPTS) click to toggle source
    # File lib/sequel/adapters/shared/postgres.rb
323 def commit_prepared_transaction(transaction_id, opts=OPTS)
324   run("COMMIT PREPARED #{literal(transaction_id)}", opts)
325 end
convert_serial_to_identity(table, opts=OPTS) click to toggle source

Convert the first primary key column in the table from being a serial column to being an identity column. If the column is already an identity column, assume it was already converted and make no changes.

Only supported on PostgreSQL 10.2+, since on those versions Sequel will use identity columns instead of serial columns for auto incrementing primary keys. Only supported when running as a superuser, since regular users cannot modify system tables, and there is no way to keep an existing sequence when changing an existing column to be an identity column.

This method can raise an exception in at least the following cases where it may otherwise succeed (there may be additional cases not listed here):

  • The serial column was added after table creation using PostgreSQL <7.3

  • A regular index also exists on the column (such an index can probably be dropped as the primary key index should suffice)

Options:

:column

Specify the column to convert instead of using the first primary key column

:server

Run the SQL on the given server

    # File lib/sequel/adapters/shared/postgres.rb
363 def convert_serial_to_identity(table, opts=OPTS)
364   raise Error, "convert_serial_to_identity is only supported on PostgreSQL 10.2+" unless server_version >= 100002
365 
366   server = opts[:server]
367   server_hash = server ? {:server=>server} : OPTS
368   ds = dataset
369   ds = ds.server(server) if server
370 
371   raise Error, "convert_serial_to_identity requires superuser permissions" unless ds.get{current_setting('is_superuser')} == 'on'
372 
373   table_oid = regclass_oid(table)
374   im = input_identifier_meth
375   unless column = (opts[:column] || ((sch = schema(table).find{|_, sc| sc[:primary_key] && sc[:auto_increment]}) && sch[0]))
376     raise Error, "could not determine column to convert from serial to identity automatically"
377   end
378   column = im.call(column)
379 
380   column_num = ds.from(:pg_attribute).
381     where(:attrelid=>table_oid, :attname=>column).
382     get(:attnum)
383 
384   pg_class = Sequel.cast('pg_class', :regclass)
385   res = ds.from(:pg_depend).
386     where(:refclassid=>pg_class, :refobjid=>table_oid, :refobjsubid=>column_num, :classid=>pg_class, :objsubid=>0, :deptype=>%w'a i').
387     select_map([:objid, Sequel.as({:deptype=>'i'}, :v)])
388 
389   case res.length
390   when 0
391     raise Error, "unable to find related sequence when converting serial to identity"
392   when 1
393     seq_oid, already_identity = res.first
394   else
395     raise Error, "more than one linked sequence found when converting serial to identity"
396   end
397 
398   return if already_identity
399 
400   transaction(server_hash) do
401     run("ALTER TABLE #{quote_schema_table(table)} ALTER COLUMN #{quote_identifier(column)} DROP DEFAULT", server_hash)
402 
403     ds.from(:pg_depend).
404       where(:classid=>pg_class, :objid=>seq_oid, :objsubid=>0, :deptype=>'a').
405       update(:deptype=>'i')
406 
407     ds.from(:pg_attribute).
408       where(:attrelid=>table_oid, :attname=>column).
409       update(:attidentity=>'d')
410   end
411 
412   remove_cached_schema(table)
413   nil
414 end
create_function(name, definition, opts=OPTS) click to toggle source

Creates the function in the database. Arguments:

name

name of the function to create

definition

string definition of the function, or object file for a dynamically loaded C function.

opts

options hash:

:args

function arguments, can be either a symbol or string specifying a type or an array of 1-3 elements:

1

argument data type

2

argument name

3

argument mode (e.g. in, out, inout)

:behavior

Should be IMMUTABLE, STABLE, or VOLATILE. PostgreSQL assumes VOLATILE by default.

:parallel

The thread safety attribute of the function. Should be SAFE, UNSAFE, RESTRICTED. PostgreSQL assumes UNSAFE by default.

:cost

The estimated cost of the function, used by the query planner.

:language

The language the function uses. SQL is the default.

:link_symbol

For a dynamically loaded see function, the function’s link symbol if different from the definition argument.

:returns

The data type returned by the function. If you are using OUT or INOUT argument modes, this is ignored. Otherwise, if this is not specified, void is used by default to specify the function is not supposed to return a value.

:rows

The estimated number of rows the function will return. Only use if the function returns SETOF something.

:security_definer

Makes the privileges of the function the same as the privileges of the user who defined the function instead of the privileges of the user who runs the function. There are security implications when doing this, see the PostgreSQL documentation.

:set

Configuration variables to set while the function is being run, can be a hash or an array of two pairs. search_path is often used here if :security_definer is used.

:strict

Makes the function return NULL when any argument is NULL.

    # File lib/sequel/adapters/shared/postgres.rb
437 def create_function(name, definition, opts=OPTS)
438   self << create_function_sql(name, definition, opts)
439 end
create_language(name, opts=OPTS) click to toggle source

Create the procedural language in the database. Arguments:

name

Name of the procedural language (e.g. plpgsql)

opts

options hash:

:handler

The name of a previously registered function used as a call handler for this language.

:replace

Replace the installed language if it already exists (on PostgreSQL 9.0+).

:trusted

Marks the language being created as trusted, allowing unprivileged users to create functions using this language.

:validator

The name of previously registered function used as a validator of functions defined in this language.

    # File lib/sequel/adapters/shared/postgres.rb
448 def create_language(name, opts=OPTS)
449   self << create_language_sql(name, opts)
450 end
create_schema(name, opts=OPTS) click to toggle source

Create a schema in the database. Arguments:

name

Name of the schema (e.g. admin)

opts

options hash:

:if_not_exists

Don’t raise an error if the schema already exists (PostgreSQL 9.3+)

:owner

The owner to set for the schema (defaults to current user if not specified)

    # File lib/sequel/adapters/shared/postgres.rb
457 def create_schema(name, opts=OPTS)
458   self << create_schema_sql(name, opts)
459 end
create_table(name, options=OPTS, &block) click to toggle source

Support partitions of tables using the :partition_of option.

Calls superclass method
    # File lib/sequel/adapters/shared/postgres.rb
462 def create_table(name, options=OPTS, &block)
463   if options[:partition_of]
464     create_partition_of_table_from_generator(name, CreatePartitionOfTableGenerator.new(&block), options)
465     return
466   end
467 
468   super
469 end
create_table?(name, options=OPTS, &block) click to toggle source

Support partitions of tables using the :partition_of option.

Calls superclass method
    # File lib/sequel/adapters/shared/postgres.rb
472 def create_table?(name, options=OPTS, &block)
473   if options[:partition_of]
474     create_table(name, options.merge!(:if_not_exists=>true), &block)
475     return
476   end
477 
478   super
479 end
create_trigger(table, name, function, opts=OPTS) click to toggle source

Create a trigger in the database. Arguments:

table

the table on which this trigger operates

name

the name of this trigger

function

the function to call for this trigger, which should return type trigger.

opts

options hash:

:after

Calls the trigger after execution instead of before.

:args

An argument or array of arguments to pass to the function.

:each_row

Calls the trigger for each row instead of for each statement.

:events

Can be :insert, :update, :delete, or an array of any of those. Calls the trigger whenever that type of statement is used. By default, the trigger is called for insert, update, or delete.

:replace

Replace the trigger with the same name if it already exists (PostgreSQL 14+).

:when

A filter to use for the trigger

    # File lib/sequel/adapters/shared/postgres.rb
493 def create_trigger(table, name, function, opts=OPTS)
494   self << create_trigger_sql(table, name, function, opts)
495 end
database_type() click to toggle source
    # File lib/sequel/adapters/shared/postgres.rb
497 def database_type
498   :postgres
499 end
defer_constraints(opts=OPTS) click to toggle source

For constraints that are deferrable, defer constraints until transaction commit. Options:

:constraints

An identifier of the constraint, or an array of identifiers for constraints, to apply this change to specific constraints.

:server

The server/shard on which to run the query.

Examples:

DB.defer_constraints
# SET CONSTRAINTS ALL DEFERRED

DB.defer_constraints(constraints: [:c1, Sequel[:sc][:c2]])
# SET CONSTRAINTS "c1", "sc"."s2" DEFERRED
    # File lib/sequel/adapters/shared/postgres.rb
516 def defer_constraints(opts=OPTS)
517   _set_constraints(' DEFERRED', opts)
518 end
do(code, opts=OPTS) click to toggle source

Use PostgreSQL’s DO syntax to execute an anonymous code block. The code should be the literal code string to use in the underlying procedural language. Options:

:language

The procedural language the code is written in. The PostgreSQL default is plpgsql. Can be specified as a string or a symbol.

    # File lib/sequel/adapters/shared/postgres.rb
525 def do(code, opts=OPTS)
526   language = opts[:language]
527   run "DO #{"LANGUAGE #{literal(language.to_s)} " if language}#{literal(code)}"
528 end
drop_function(name, opts=OPTS) click to toggle source

Drops the function from the database. Arguments:

name

name of the function to drop

opts

options hash:

:args

The arguments for the function. See create_function_sql.

:cascade

Drop other objects depending on this function.

:if_exists

Don’t raise an error if the function doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb
536 def drop_function(name, opts=OPTS)
537   self << drop_function_sql(name, opts)
538 end
drop_language(name, opts=OPTS) click to toggle source

Drops a procedural language from the database. Arguments:

name

name of the procedural language to drop

opts

options hash:

:cascade

Drop other objects depending on this function.

:if_exists

Don’t raise an error if the function doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb
545 def drop_language(name, opts=OPTS)
546   self << drop_language_sql(name, opts)
547 end
drop_schema(name, opts=OPTS) click to toggle source

Drops a schema from the database. Arguments:

name

name of the schema to drop

opts

options hash:

:cascade

Drop all objects in this schema.

:if_exists

Don’t raise an error if the schema doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb
554 def drop_schema(name, opts=OPTS)
555   self << drop_schema_sql(name, opts)
556 end
drop_trigger(table, name, opts=OPTS) click to toggle source

Drops a trigger from the database. Arguments:

table

table from which to drop the trigger

name

name of the trigger to drop

opts

options hash:

:cascade

Drop other objects depending on this function.

:if_exists

Don’t raise an error if the function doesn’t exist.

    # File lib/sequel/adapters/shared/postgres.rb
564 def drop_trigger(table, name, opts=OPTS)
565   self << drop_trigger_sql(table, name, opts)
566 end
foreign_key_list(table, opts=OPTS) click to toggle source

Return full foreign key information using the pg system tables, including :name, :on_delete, :on_update, and :deferrable entries in the hashes.

Supports additional options:

:reverse

Instead of returning foreign keys in the current table, return foreign keys in other tables that reference the current table.

:schema

Set to true to have the :table value in the hashes be a qualified identifier. Set to false to use a separate :schema value with the related schema. Defaults to whether the given table argument is a qualified identifier.

    # File lib/sequel/adapters/shared/postgres.rb
578 def foreign_key_list(table, opts=OPTS)
579   m = output_identifier_meth
580   schema, _ = opts.fetch(:schema, schema_and_table(table))
581 
582   h = {}
583   fklod_map = FOREIGN_KEY_LIST_ON_DELETE_MAP 
584   reverse = opts[:reverse]
585 
586   (reverse ? _reverse_foreign_key_list_ds : _foreign_key_list_ds).where_each(Sequel[:cl][:oid]=>regclass_oid(table)) do |row|
587     if reverse
588       key = [row[:schema], row[:table], row[:name]]
589     else
590       key = row[:name]
591     end
592 
593     if r = h[key]
594       r[:columns] << m.call(row[:column])
595       r[:key] << m.call(row[:refcolumn])
596     else
597       entry = h[key] = {
598         :name=>m.call(row[:name]),
599         :columns=>[m.call(row[:column])],
600         :key=>[m.call(row[:refcolumn])],
601         :on_update=>fklod_map[row[:on_update]],
602         :on_delete=>fklod_map[row[:on_delete]],
603         :deferrable=>row[:deferrable],
604         :table=>schema ? SQL::QualifiedIdentifier.new(m.call(row[:schema]), m.call(row[:table])) : m.call(row[:table]),
605       }
606 
607       unless schema
608         # If not combining schema information into the :table entry
609         # include it as a separate entry.
610         entry[:schema] = m.call(row[:schema])
611       end
612     end
613   end
614 
615   h.values
616 end
freeze() click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/postgres.rb
618 def freeze
619   server_version
620   supports_prepared_transactions?
621   _schema_ds
622   _select_serial_sequence_ds
623   _select_custom_sequence_ds
624   _select_pk_ds
625   _indexes_ds
626   _check_constraints_ds
627   _foreign_key_list_ds
628   _reverse_foreign_key_list_ds
629   @conversion_procs.freeze
630   super
631 end
immediate_constraints(opts=OPTS) click to toggle source

Immediately apply deferrable constraints.

:constraints

An identifier of the constraint, or an array of identifiers for constraints, to apply this change to specific constraints.

:server

The server/shard on which to run the query.

Examples:

DB.immediate_constraints
# SET CONSTRAINTS ALL IMMEDIATE

DB.immediate_constraints(constraints: [:c1, Sequel[:sc][:c2]])
# SET CONSTRAINTS "c1", "sc"."s2" IMMEDIATE
    # File lib/sequel/adapters/shared/postgres.rb
647 def immediate_constraints(opts=OPTS)
648   _set_constraints(' IMMEDIATE', opts)
649 end
indexes(table, opts=OPTS) click to toggle source

Use the pg_* system tables to determine indexes on a table

    # File lib/sequel/adapters/shared/postgres.rb
652 def indexes(table, opts=OPTS)
653   m = output_identifier_meth
654   cond = {Sequel[:tab][:oid]=>regclass_oid(table, opts)}
655   cond[:indpred] = nil unless opts[:include_partial]
656 
657   indexes = {}
658   _indexes_ds.where_each(cond) do |r|
659     i = indexes[m.call(r[:name])] ||= {:columns=>[], :unique=>r[:unique], :deferrable=>r[:deferrable]}
660     i[:columns] << m.call(r[:column])
661   end
662   indexes
663 end
locks() click to toggle source

Dataset containing all current database locks

    # File lib/sequel/adapters/shared/postgres.rb
666 def locks
667   dataset.from(:pg_class).join(:pg_locks, :relation=>:relfilenode).select{[pg_class[:relname], Sequel::SQL::ColumnAll.new(:pg_locks)]}
668 end
notify(channel, opts=OPTS) click to toggle source

Notifies the given channel. See the PostgreSQL NOTIFY documentation. Options:

:payload

The payload string to use for the NOTIFY statement. Only supported in PostgreSQL 9.0+.

:server

The server to which to send the NOTIFY statement, if the sharding support is being used.

    # File lib/sequel/adapters/shared/postgres.rb
676 def notify(channel, opts=OPTS)
677   sql = String.new
678   sql << "NOTIFY "
679   dataset.send(:identifier_append, sql, channel)
680   if payload = opts[:payload]
681     sql << ", "
682     dataset.literal_append(sql, payload.to_s)
683   end
684   execute_ddl(sql, opts)
685 end
primary_key(table, opts=OPTS) click to toggle source

Return primary key for the given table.

    # File lib/sequel/adapters/shared/postgres.rb
688 def primary_key(table, opts=OPTS)
689   quoted_table = quote_schema_table(table)
690   Sequel.synchronize{return @primary_keys[quoted_table] if @primary_keys.has_key?(quoted_table)}
691   value = _select_pk_ds.where_single_value(Sequel[:pg_class][:oid] => regclass_oid(table, opts))
692   Sequel.synchronize{@primary_keys[quoted_table] = value}
693 end
primary_key_sequence(table, opts=OPTS) click to toggle source

Return the sequence providing the default for the primary key for the given table.

    # File lib/sequel/adapters/shared/postgres.rb
696 def primary_key_sequence(table, opts=OPTS)
697   quoted_table = quote_schema_table(table)
698   Sequel.synchronize{return @primary_key_sequences[quoted_table] if @primary_key_sequences.has_key?(quoted_table)}
699   cond = {Sequel[:t][:oid] => regclass_oid(table, opts)}
700   value = if pks = _select_serial_sequence_ds.first(cond)
701     literal(SQL::QualifiedIdentifier.new(pks[:schema], pks[:sequence]))
702   elsif pks = _select_custom_sequence_ds.first(cond)
703     literal(SQL::QualifiedIdentifier.new(pks[:schema], LiteralString.new(pks[:sequence])))
704   end
705 
706   Sequel.synchronize{@primary_key_sequences[quoted_table] = value} if value
707 end
refresh_view(name, opts=OPTS) click to toggle source

Refresh the materialized view with the given name.

DB.refresh_view(:items_view)
# REFRESH MATERIALIZED VIEW items_view
DB.refresh_view(:items_view, concurrently: true)
# REFRESH MATERIALIZED VIEW CONCURRENTLY items_view
    # File lib/sequel/adapters/shared/postgres.rb
715 def refresh_view(name, opts=OPTS)
716   run "REFRESH MATERIALIZED VIEW#{' CONCURRENTLY' if opts[:concurrently]} #{quote_schema_table(name)}"
717 end
reset_primary_key_sequence(table) click to toggle source

Reset the primary key sequence for the given table, basing it on the maximum current value of the table’s primary key.

    # File lib/sequel/adapters/shared/postgres.rb
721 def reset_primary_key_sequence(table)
722   return unless seq = primary_key_sequence(table)
723   pk = SQL::Identifier.new(primary_key(table))
724   db = self
725   s, t = schema_and_table(table)
726   table = Sequel.qualify(s, t) if s
727 
728   if server_version >= 100000
729     seq_ds = metadata_dataset.from(:pg_sequence).where(:seqrelid=>regclass_oid(LiteralString.new(seq)))
730     increment_by = :seqincrement
731     min_value = :seqmin
732   # :nocov:
733   else
734     seq_ds = metadata_dataset.from(LiteralString.new(seq))
735     increment_by = :increment_by
736     min_value = :min_value
737   # :nocov:
738   end
739 
740   get{setval(seq, db[table].select(coalesce(max(pk)+seq_ds.select(increment_by), seq_ds.select(min_value))), false)}
741 end
rollback_prepared_transaction(transaction_id, opts=OPTS) click to toggle source
    # File lib/sequel/adapters/shared/postgres.rb
743 def rollback_prepared_transaction(transaction_id, opts=OPTS)
744   run("ROLLBACK PREPARED #{literal(transaction_id)}", opts)
745 end
serial_primary_key_options() click to toggle source

PostgreSQL uses SERIAL psuedo-type instead of AUTOINCREMENT for managing incrementing primary keys.

    # File lib/sequel/adapters/shared/postgres.rb
749 def serial_primary_key_options
750   # :nocov:
751   auto_increment_key = server_version >= 100002 ? :identity : :serial
752   # :nocov:
753   {:primary_key => true, auto_increment_key => true, :type=>Integer}
754 end
server_version(server=nil) click to toggle source

The version of the PostgreSQL server, used for determining capability.

    # File lib/sequel/adapters/shared/postgres.rb
757 def server_version(server=nil)
758   return @server_version if @server_version
759   ds = dataset
760   ds = ds.server(server) if server
761   @server_version = swallow_database_error{ds.with_sql("SELECT CAST(current_setting('server_version_num') AS integer) AS v").single_value} || 0
762 end
supports_create_table_if_not_exists?() click to toggle source

PostgreSQL supports CREATE TABLE IF NOT EXISTS on 9.1+

    # File lib/sequel/adapters/shared/postgres.rb
765 def supports_create_table_if_not_exists?
766   server_version >= 90100
767 end
supports_deferrable_constraints?() click to toggle source

PostgreSQL 9.0+ supports some types of deferrable constraints beyond foreign key constraints.

    # File lib/sequel/adapters/shared/postgres.rb
770 def supports_deferrable_constraints?
771   server_version >= 90000
772 end
supports_deferrable_foreign_key_constraints?() click to toggle source

PostgreSQL supports deferrable foreign key constraints.

    # File lib/sequel/adapters/shared/postgres.rb
775 def supports_deferrable_foreign_key_constraints?
776   true
777 end
supports_drop_table_if_exists?() click to toggle source

PostgreSQL supports DROP TABLE IF EXISTS

    # File lib/sequel/adapters/shared/postgres.rb
780 def supports_drop_table_if_exists?
781   true
782 end
supports_partial_indexes?() click to toggle source

PostgreSQL supports partial indexes.

    # File lib/sequel/adapters/shared/postgres.rb
785 def supports_partial_indexes?
786   true
787 end
supports_prepared_transactions?() click to toggle source

PostgreSQL supports prepared transactions (two-phase commit) if max_prepared_transactions is greater than 0.

    # File lib/sequel/adapters/shared/postgres.rb
796 def supports_prepared_transactions?
797   return @supports_prepared_transactions if defined?(@supports_prepared_transactions)
798   @supports_prepared_transactions = self['SHOW max_prepared_transactions'].get.to_i > 0
799 end
supports_savepoints?() click to toggle source

PostgreSQL supports savepoints

    # File lib/sequel/adapters/shared/postgres.rb
802 def supports_savepoints?
803   true
804 end
supports_transaction_isolation_levels?() click to toggle source

PostgreSQL supports transaction isolation levels

    # File lib/sequel/adapters/shared/postgres.rb
807 def supports_transaction_isolation_levels?
808   true
809 end
supports_transactional_ddl?() click to toggle source

PostgreSQL supports transaction DDL statements.

    # File lib/sequel/adapters/shared/postgres.rb
812 def supports_transactional_ddl?
813   true
814 end
supports_trigger_conditions?() click to toggle source

PostgreSQL 9.0+ supports trigger conditions.

    # File lib/sequel/adapters/shared/postgres.rb
790 def supports_trigger_conditions?
791   server_version >= 90000
792 end
tables(opts=OPTS, &block) click to toggle source

Array of symbols specifying table names in the current database. The dataset used is yielded to the block if one is provided, otherwise, an array of symbols of table names is returned.

Options:

:qualify

Return the tables as Sequel::SQL::QualifiedIdentifier instances, using the schema the table is located in as the qualifier.

:schema

The schema to search

:server

The server to use

    # File lib/sequel/adapters/shared/postgres.rb
825 def tables(opts=OPTS, &block)
826   pg_class_relname(['r', 'p'], opts, &block)
827 end
type_supported?(type) click to toggle source

Check whether the given type name string/symbol (e.g. :hstore) is supported by the database.

    # File lib/sequel/adapters/shared/postgres.rb
831 def type_supported?(type)
832   Sequel.synchronize{return @supported_types[type] if @supported_types.has_key?(type)}
833   supported = from(:pg_type).where(:typtype=>'b', :typname=>type.to_s).count > 0
834   Sequel.synchronize{return @supported_types[type] = supported}
835 end
values(v) click to toggle source

Creates a dataset that uses the VALUES clause:

DB.values([[1, 2], [3, 4]])
# VALUES ((1, 2), (3, 4))

DB.values([[1, 2], [3, 4]]).order(:column2).limit(1, 1)
# VALUES ((1, 2), (3, 4)) ORDER BY column2 LIMIT 1 OFFSET 1
    # File lib/sequel/adapters/shared/postgres.rb
844 def values(v)
845   raise Error, "Cannot provide an empty array for values" if v.empty?
846   @default_dataset.clone(:values=>v)
847 end
views(opts=OPTS) click to toggle source

Array of symbols specifying view names in the current database.

Options:

:materialized

Return materialized views

:qualify

Return the views as Sequel::SQL::QualifiedIdentifier instances, using the schema the view is located in as the qualifier.

:schema

The schema to search

:server

The server to use

    # File lib/sequel/adapters/shared/postgres.rb
857 def views(opts=OPTS)
858   relkind = opts[:materialized] ? 'm' : 'v'
859   pg_class_relname(relkind, opts)
860 end
with_advisory_lock(lock_id, opts=OPTS) { || ... } click to toggle source

Attempt to acquire an exclusive advisory lock with the given lock_id (which should be a 64-bit integer). If successful, yield to the block, then release the advisory lock when the block exits. If unsuccessful, raise a Sequel::AdvisoryLockError.

DB.with_advisory_lock(1347){DB.get(1)}
# SELECT pg_try_advisory_lock(1357) LIMIT 1
# SELECT 1 AS v LIMIT 1
# SELECT pg_advisory_unlock(1357) LIMIT 1

Options:

:wait

Do not raise an error, instead, wait until the advisory lock can be acquired.

    # File lib/sequel/adapters/shared/postgres.rb
873 def with_advisory_lock(lock_id, opts=OPTS)
874   ds = dataset
875   if server = opts[:server]
876     ds = ds.server(server)
877   end
878 
879   synchronize(server) do |c|
880     begin
881       if opts[:wait]
882         ds.get{pg_advisory_lock(lock_id)}
883         locked = true
884       else
885         unless locked = ds.get{pg_try_advisory_lock(lock_id)}
886           raise AdvisoryLockError, "unable to acquire advisory lock #{lock_id.inspect}"
887         end
888       end
889 
890       yield
891     ensure
892       ds.get{pg_advisory_unlock(lock_id)} if locked
893     end
894   end
895 end

Private Instance Methods

__foreign_key_list_ds(reverse) click to toggle source

Build dataset used for foreign key list methods.

    # File lib/sequel/adapters/shared/postgres.rb
919 def __foreign_key_list_ds(reverse)
920   if reverse
921     ctable = Sequel[:att2]
922     cclass = Sequel[:cl2]
923     rtable = Sequel[:att]
924     rclass = Sequel[:cl]
925   else
926     ctable = Sequel[:att]
927     cclass = Sequel[:cl]
928     rtable = Sequel[:att2]
929     rclass = Sequel[:cl2]
930   end
931 
932   if server_version >= 90500
933     cpos = Sequel.expr{array_position(co[:conkey], ctable[:attnum])}
934     rpos = Sequel.expr{array_position(co[:confkey], rtable[:attnum])}
935   # :nocov:
936   else
937     range = 0...32
938     cpos = Sequel.expr{SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(co[:conkey], [x]), x]}, 32, ctable[:attnum])}
939     rpos = Sequel.expr{SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(co[:confkey], [x]), x]}, 32, rtable[:attnum])}
940   # :nocov:
941   end
942 
943   ds = metadata_dataset.
944     from{pg_constraint.as(:co)}.
945     join(Sequel[:pg_class].as(cclass), :oid=>:conrelid).
946     join(Sequel[:pg_attribute].as(ctable), :attrelid=>:oid, :attnum=>SQL::Function.new(:ANY, Sequel[:co][:conkey])).
947     join(Sequel[:pg_class].as(rclass), :oid=>Sequel[:co][:confrelid]).
948     join(Sequel[:pg_attribute].as(rtable), :attrelid=>:oid, :attnum=>SQL::Function.new(:ANY, Sequel[:co][:confkey])).
949     join(Sequel[:pg_namespace].as(:nsp), :oid=>Sequel[:cl2][:relnamespace]).
950     order{[co[:conname], cpos]}.
951     where{{
952       cl[:relkind]=>%w'r p',
953       co[:contype]=>'f',
954       cpos=>rpos
955     }}.
956     select{[
957       co[:conname].as(:name),
958       ctable[:attname].as(:column),
959       co[:confupdtype].as(:on_update),
960       co[:confdeltype].as(:on_delete),
961       cl2[:relname].as(:table),
962       rtable[:attname].as(:refcolumn),
963       SQL::BooleanExpression.new(:AND, co[:condeferrable], co[:condeferred]).as(:deferrable),
964       nsp[:nspname].as(:schema)
965     ]}
966 
967   if reverse
968     ds = ds.order_append(Sequel[:nsp][:nspname], Sequel[:cl2][:relname])
969   end
970 
971   ds
972 end
_check_constraints_ds() click to toggle source

Dataset used to retrieve CHECK constraint information

    # File lib/sequel/adapters/shared/postgres.rb
900 def _check_constraints_ds
901   @_check_constraints_ds ||= metadata_dataset.
902     from{pg_constraint.as(:co)}.
903     left_join(Sequel[:pg_attribute].as(:att), :attrelid=>:conrelid, :attnum=>SQL::Function.new(:ANY, Sequel[:co][:conkey])).
904     where(:contype=>'c').
905     select{[co[:conname].as(:constraint), att[:attname].as(:column), pg_get_constraintdef(co[:oid]).as(:definition)]}
906 end
_foreign_key_list_ds() click to toggle source

Dataset used to retrieve foreign keys referenced by a table

    # File lib/sequel/adapters/shared/postgres.rb
909 def _foreign_key_list_ds
910   @_foreign_key_list_ds ||= __foreign_key_list_ds(false)
911 end
_indexes_ds() click to toggle source

Dataset used to retrieve index information

     # File lib/sequel/adapters/shared/postgres.rb
 975 def _indexes_ds
 976   @_indexes_ds ||= begin
 977     if server_version >= 90500
 978       order = [Sequel[:indc][:relname], Sequel.function(:array_position, Sequel[:ind][:indkey], Sequel[:att][:attnum])]
 979     # :nocov:
 980     else
 981       range = 0...32
 982       order = [Sequel[:indc][:relname], SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(Sequel[:ind][:indkey], [x]), x]}, 32, Sequel[:att][:attnum])]
 983     # :nocov:
 984     end
 985 
 986     attnums = SQL::Function.new(:ANY, Sequel[:ind][:indkey])
 987 
 988     ds = metadata_dataset.
 989       from{pg_class.as(:tab)}.
 990       join(Sequel[:pg_index].as(:ind), :indrelid=>:oid).
 991       join(Sequel[:pg_class].as(:indc), :oid=>:indexrelid).
 992       join(Sequel[:pg_attribute].as(:att), :attrelid=>Sequel[:tab][:oid], :attnum=>attnums).
 993       left_join(Sequel[:pg_constraint].as(:con), :conname=>Sequel[:indc][:relname]).
 994       where{{
 995         indc[:relkind]=>%w'i I',
 996         ind[:indisprimary]=>false,
 997         :indexprs=>nil,
 998         :indisvalid=>true}}.
 999       order(*order).
1000       select{[indc[:relname].as(:name), ind[:indisunique].as(:unique), att[:attname].as(:column), con[:condeferrable].as(:deferrable)]}
1001 
1002     # :nocov:
1003     ds = ds.where(:indisready=>true) if server_version >= 80300
1004     ds = ds.where(:indislive=>true) if server_version >= 90300
1005     # :nocov:
1006 
1007     ds
1008   end
1009 end
_reverse_foreign_key_list_ds() click to toggle source

Dataset used to retrieve foreign keys referencing a table

    # File lib/sequel/adapters/shared/postgres.rb
914 def _reverse_foreign_key_list_ds
915   @_reverse_foreign_key_list_ds ||= __foreign_key_list_ds(true)
916 end
_schema_ds() click to toggle source

Dataset used to get schema for tables

     # File lib/sequel/adapters/shared/postgres.rb
1072 def _schema_ds
1073   @_schema_ds ||= begin
1074     ds = metadata_dataset.select{[
1075         pg_attribute[:attname].as(:name),
1076         SQL::Cast.new(pg_attribute[:atttypid], :integer).as(:oid),
1077         SQL::Cast.new(basetype[:oid], :integer).as(:base_oid),
1078         SQL::Function.new(:format_type, basetype[:oid], pg_type[:typtypmod]).as(:db_base_type),
1079         SQL::Function.new(:format_type, pg_type[:oid], pg_attribute[:atttypmod]).as(:db_type),
1080         SQL::Function.new(:pg_get_expr, pg_attrdef[:adbin], pg_class[:oid]).as(:default),
1081         SQL::BooleanExpression.new(:NOT, pg_attribute[:attnotnull]).as(:allow_null),
1082         SQL::Function.new(:COALESCE, SQL::BooleanExpression.from_value_pairs(pg_attribute[:attnum] => SQL::Function.new(:ANY, pg_index[:indkey])), false).as(:primary_key),
1083         Sequel[:pg_type][:typtype],
1084         (~Sequel[Sequel[:elementtype][:oid]=>nil]).as(:is_array),
1085       ]}.
1086       from(:pg_class).
1087       join(:pg_attribute, :attrelid=>:oid).
1088       join(:pg_type, :oid=>:atttypid).
1089       left_outer_join(Sequel[:pg_type].as(:basetype), :oid=>:typbasetype).
1090       left_outer_join(Sequel[:pg_type].as(:elementtype), :typarray=>Sequel[:pg_type][:oid]).
1091       left_outer_join(:pg_attrdef, :adrelid=>Sequel[:pg_class][:oid], :adnum=>Sequel[:pg_attribute][:attnum]).
1092       left_outer_join(:pg_index, :indrelid=>Sequel[:pg_class][:oid], :indisprimary=>true).
1093       where{{pg_attribute[:attisdropped]=>false}}.
1094       where{pg_attribute[:attnum] > 0}.
1095       order{pg_attribute[:attnum]}
1096 
1097     # :nocov:
1098     if server_version > 100000
1099     # :nocov:
1100       ds = ds.select_append{pg_attribute[:attidentity]}
1101 
1102       # :nocov:
1103       if server_version > 120000
1104       # :nocov:
1105         ds = ds.select_append{Sequel.~(pg_attribute[:attgenerated]=>'').as(:generated)}
1106       end
1107     end
1108 
1109     ds
1110   end
1111 end
_select_custom_sequence_ds() click to toggle source

Dataset used to determine custom serial sequences for tables

     # File lib/sequel/adapters/shared/postgres.rb
1012 def _select_custom_sequence_ds
1013   @_select_custom_sequence_ds ||= metadata_dataset.
1014     from{pg_class.as(:t)}.
1015     join(:pg_namespace, {:oid => :relnamespace}, :table_alias=>:name).
1016     join(:pg_attribute, {:attrelid => Sequel[:t][:oid]}, :table_alias=>:attr).
1017     join(:pg_attrdef, {:adrelid => :attrelid, :adnum => :attnum}, :table_alias=>:def).
1018     join(:pg_constraint, {:conrelid => :adrelid, Sequel[:cons][:conkey].sql_subscript(1) => :adnum}, :table_alias=>:cons).
1019     where{{cons[:contype] => 'p', pg_get_expr(self.def[:adbin], attr[:attrelid]) => /nextval/i}}.
1020     select{
1021       expr = split_part(pg_get_expr(self.def[:adbin], attr[:attrelid]), "'", 2)
1022       [
1023         name[:nspname].as(:schema),
1024         Sequel.case({{expr => /./} => substr(expr, strpos(expr, '.')+1)}, expr).as(:sequence)
1025       ]
1026     }
1027 end
_select_pk_ds() click to toggle source

Dataset used to determine primary keys for tables

     # File lib/sequel/adapters/shared/postgres.rb
1058 def _select_pk_ds
1059   @_select_pk_ds ||= metadata_dataset.
1060     from(:pg_class, :pg_attribute, :pg_index, :pg_namespace).
1061     where{[
1062       [pg_class[:oid], pg_attribute[:attrelid]],
1063       [pg_class[:relnamespace], pg_namespace[:oid]],
1064       [pg_class[:oid], pg_index[:indrelid]],
1065       [pg_index[:indkey].sql_subscript(0), pg_attribute[:attnum]],
1066       [pg_index[:indisprimary], 't']
1067     ]}.
1068     select{pg_attribute[:attname].as(:pk)}
1069 end
_select_serial_sequence_ds() click to toggle source

Dataset used to determine normal serial sequences for tables

     # File lib/sequel/adapters/shared/postgres.rb
1030 def _select_serial_sequence_ds
1031   @_serial_sequence_ds ||= metadata_dataset.
1032     from{[
1033       pg_class.as(:seq),
1034       pg_attribute.as(:attr),
1035       pg_depend.as(:dep),
1036       pg_namespace.as(:name),
1037       pg_constraint.as(:cons),
1038       pg_class.as(:t)
1039     ]}.
1040     where{[
1041       [seq[:oid], dep[:objid]],
1042       [seq[:relnamespace], name[:oid]],
1043       [seq[:relkind], 'S'],
1044       [attr[:attrelid], dep[:refobjid]],
1045       [attr[:attnum], dep[:refobjsubid]],
1046       [attr[:attrelid], cons[:conrelid]],
1047       [attr[:attnum], cons[:conkey].sql_subscript(1)],
1048       [attr[:attrelid], t[:oid]],
1049       [cons[:contype], 'p']
1050     ]}.
1051     select{[
1052       name[:nspname].as(:schema),
1053       seq[:relname].as(:sequence)
1054     ]}
1055 end
_set_constraints(type, opts) click to toggle source

Internals of defer_constraints/immediate_constraints

     # File lib/sequel/adapters/shared/postgres.rb
1114 def _set_constraints(type, opts)
1115   execute_ddl(_set_constraints_sql(type, opts), opts)
1116 end
_set_constraints_sql(type, opts) click to toggle source

SQL to use for SET CONSTRAINTS

     # File lib/sequel/adapters/shared/postgres.rb
1119 def _set_constraints_sql(type, opts)
1120   sql = String.new
1121   sql << "SET CONSTRAINTS "
1122   if constraints = opts[:constraints]
1123     dataset.send(:source_list_append, sql, Array(constraints))
1124   else
1125     sql << "ALL"
1126   end
1127   sql << type
1128 end
_table_exists?(ds) click to toggle source

Consider lock or statement timeout errors as evidence that the table exists but is locked.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1132 def _table_exists?(ds)
1133   super
1134 rescue DatabaseError => e    
1135   raise e unless /canceling statement due to (?:statement|lock) timeout/ =~ e.message 
1136 end
alter_table_add_column_sql(table, op) click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1138 def alter_table_add_column_sql(table, op)
1139   "ADD COLUMN#{' IF NOT EXISTS' if op[:if_not_exists]} #{column_definition_sql(op)}"
1140 end
alter_table_drop_column_sql(table, op) click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1156 def alter_table_drop_column_sql(table, op)
1157   "DROP COLUMN #{'IF EXISTS ' if op[:if_exists]}#{quote_identifier(op[:name])}#{' CASCADE' if op[:cascade]}"
1158 end
alter_table_generator_class() click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1142 def alter_table_generator_class
1143   Postgres::AlterTableGenerator
1144 end
alter_table_set_column_type_sql(table, op) click to toggle source
Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1146 def alter_table_set_column_type_sql(table, op)
1147   s = super
1148   if using = op[:using]
1149     using = Sequel::LiteralString.new(using) if using.is_a?(String)
1150     s += ' USING '
1151     s << literal(using)
1152   end
1153   s
1154 end
alter_table_validate_constraint_sql(table, op) click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1160 def alter_table_validate_constraint_sql(table, op)
1161   "VALIDATE CONSTRAINT #{quote_identifier(op[:name])}"
1162 end
begin_new_transaction(conn, opts) click to toggle source

If the :synchronous option is given and non-nil, set synchronous_commit appropriately. Valid values for the :synchronous option are true, :on, false, :off, :local, and :remote_write.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1167 def begin_new_transaction(conn, opts)
1168   super
1169   if opts.has_key?(:synchronous)
1170     case sync = opts[:synchronous]
1171     when true
1172       sync = :on
1173     when false
1174       sync = :off
1175     when nil
1176       return
1177     end
1178 
1179     log_connection_execute(conn, "SET LOCAL synchronous_commit = #{sync}")
1180   end
1181 end
begin_savepoint(conn, opts) click to toggle source

Set the READ ONLY transaction setting per savepoint, as PostgreSQL supports that.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1184 def begin_savepoint(conn, opts)
1185   super
1186 
1187   unless (read_only = opts[:read_only]).nil?
1188     log_connection_execute(conn, "SET TRANSACTION READ #{read_only ? 'ONLY' : 'WRITE'}")
1189   end
1190 end
column_definition_collate_sql(sql, column) click to toggle source

Literalize non-String collate options. This is because unquoted collatations are folded to lowercase, and PostgreSQL used mixed case or capitalized collations.

     # File lib/sequel/adapters/shared/postgres.rb
1194 def column_definition_collate_sql(sql, column)
1195   if collate = column[:collate]
1196     collate = literal(collate) unless collate.is_a?(String)
1197     sql << " COLLATE #{collate}"
1198   end
1199 end
column_definition_default_sql(sql, column) click to toggle source

Support identity columns, but only use the identity SQL syntax if no default value is given.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1203 def column_definition_default_sql(sql, column)
1204   super
1205   if !column[:serial] && !['smallserial', 'serial', 'bigserial'].include?(column[:type].to_s) && !column[:default]
1206     if (identity = column[:identity])
1207       sql << " GENERATED "
1208       sql << (identity == :always ? "ALWAYS" : "BY DEFAULT")
1209       sql << " AS IDENTITY"
1210     elsif (generated = column[:generated_always_as])
1211       sql << " GENERATED ALWAYS AS (#{literal(generated)}) STORED"
1212     end
1213   end
1214 end
column_schema_normalize_default(default, type) click to toggle source

Handle PostgreSQL specific default format.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1217 def column_schema_normalize_default(default, type)
1218   if m = /\A(?:B?('.*')::[^']+|\((-?\d+(?:\.\d+)?)\))\z/.match(default)
1219     default = m[1] || m[2]
1220   end
1221   super(default, type)
1222 end
combinable_alter_table_op?(op) click to toggle source

PostgreSQL can’t combine rename_column operations, and it can combine the custom validate_constraint operation.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1236 def combinable_alter_table_op?(op)
1237   (super || op[:op] == :validate_constraint) && op[:op] != :rename_column
1238 end
commit_transaction(conn, opts=OPTS) click to toggle source

If the :prepare option is given and we aren’t in a savepoint, prepare the transaction for a two-phase commit.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1226 def commit_transaction(conn, opts=OPTS)
1227   if (s = opts[:prepare]) && savepoint_level(conn) <= 1
1228     log_connection_execute(conn, "PREPARE TRANSACTION #{literal(s)}")
1229   else
1230     super
1231   end
1232 end
connection_configuration_sqls(opts=@opts) click to toggle source

The SQL queries to execute when starting a new connection.

     # File lib/sequel/adapters/shared/postgres.rb
1242 def connection_configuration_sqls(opts=@opts)
1243   sqls = []
1244 
1245   sqls << "SET standard_conforming_strings = ON" if typecast_value_boolean(opts.fetch(:force_standard_strings, true))
1246 
1247   cmm = opts.fetch(:client_min_messages, :warning)
1248   if cmm && !cmm.to_s.empty?
1249     cmm = cmm.to_s.upcase.strip
1250     unless VALID_CLIENT_MIN_MESSAGES.include?(cmm)
1251       raise Error, "Unsupported client_min_messages setting: #{cmm}"
1252     end
1253     sqls << "SET client_min_messages = '#{cmm.to_s.upcase}'"
1254   end
1255 
1256   if search_path = opts[:search_path]
1257     case search_path
1258     when String
1259       search_path = search_path.split(",").map(&:strip)
1260     when Array
1261       # nil
1262     else
1263       raise Error, "unrecognized value for :search_path option: #{search_path.inspect}"
1264     end
1265     sqls << "SET search_path = #{search_path.map{|s| "\"#{s.gsub('"', '""')}\""}.join(',')}"
1266   end
1267 
1268   sqls
1269 end
constraint_definition_sql(constraint) click to toggle source

Handle exclusion constraints.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1272 def constraint_definition_sql(constraint)
1273   case constraint[:type]
1274   when :exclude
1275     elements = constraint[:elements].map{|c, op| "#{literal(c)} WITH #{op}"}.join(', ')
1276     sql = String.new
1277     sql << "#{"CONSTRAINT #{quote_identifier(constraint[:name])} " if constraint[:name]}EXCLUDE USING #{constraint[:using]||'gist'} (#{elements})#{" WHERE #{filter_expr(constraint[:where])}" if constraint[:where]}"
1278     constraint_deferrable_sql_append(sql, constraint[:deferrable])
1279     sql
1280   when :foreign_key, :check
1281     sql = super
1282     if constraint[:not_valid]
1283       sql << " NOT VALID"
1284     end
1285     sql
1286   else
1287     super
1288   end
1289 end
copy_into_sql(table, opts) click to toggle source

SQL for doing fast table insert from stdin.

     # File lib/sequel/adapters/shared/postgres.rb
1320 def copy_into_sql(table, opts)
1321   sql = String.new
1322   sql << "COPY #{literal(table)}"
1323   if cols = opts[:columns]
1324     sql << literal(Array(cols))
1325   end
1326   sql << " FROM STDIN"
1327   if opts[:options] || opts[:format]
1328     sql << " ("
1329     sql << "FORMAT #{opts[:format]}" if opts[:format]
1330     sql << "#{', ' if opts[:format]}#{opts[:options]}" if opts[:options]
1331     sql << ')'
1332   end
1333   sql
1334 end
copy_table_sql(table, opts) click to toggle source

SQL for doing fast table output to stdout.

     # File lib/sequel/adapters/shared/postgres.rb
1337 def copy_table_sql(table, opts)
1338   if table.is_a?(String)
1339     table
1340   else
1341     if opts[:options] || opts[:format]
1342       options = String.new
1343       options << " ("
1344       options << "FORMAT #{opts[:format]}" if opts[:format]
1345       options << "#{', ' if opts[:format]}#{opts[:options]}" if opts[:options]
1346       options << ')'
1347     end
1348     table = if table.is_a?(::Sequel::Dataset)
1349       "(#{table.sql})"
1350     else
1351       literal(table)
1352     end
1353     "COPY #{table} TO STDOUT#{options}"
1354   end
1355 end
create_function_sql(name, definition, opts=OPTS) click to toggle source

SQL statement to create database function.

     # File lib/sequel/adapters/shared/postgres.rb
1358       def create_function_sql(name, definition, opts=OPTS)
1359         args = opts[:args]
1360         if !opts[:args].is_a?(Array) || !opts[:args].any?{|a| Array(a).length == 3 and %w'OUT INOUT'.include?(a[2].to_s)}
1361           returns = opts[:returns] || 'void'
1362         end
1363         language = opts[:language] || 'SQL'
1364         <<-END
1365         CREATE#{' OR REPLACE' if opts[:replace]} FUNCTION #{name}#{sql_function_args(args)}
1366         #{"RETURNS #{returns}" if returns}
1367         LANGUAGE #{language}
1368         #{opts[:behavior].to_s.upcase if opts[:behavior]}
1369         #{'STRICT' if opts[:strict]}
1370         #{'SECURITY DEFINER' if opts[:security_definer]}
1371         #{"PARALLEL #{opts[:parallel].to_s.upcase}" if opts[:parallel]}
1372         #{"COST #{opts[:cost]}" if opts[:cost]}
1373         #{"ROWS #{opts[:rows]}" if opts[:rows]}
1374         #{opts[:set].map{|k,v| " SET #{k} = #{v}"}.join("\n") if opts[:set]}
1375         AS #{literal(definition.to_s)}#{", #{literal(opts[:link_symbol].to_s)}" if opts[:link_symbol]}
1376         END
1377       end
create_language_sql(name, opts=OPTS) click to toggle source

SQL for creating a procedural language.

     # File lib/sequel/adapters/shared/postgres.rb
1380 def create_language_sql(name, opts=OPTS)
1381   "CREATE#{' OR REPLACE' if opts[:replace] && server_version >= 90000}#{' TRUSTED' if opts[:trusted]} LANGUAGE #{name}#{" HANDLER #{opts[:handler]}" if opts[:handler]}#{" VALIDATOR #{opts[:validator]}" if opts[:validator]}"
1382 end
create_partition_of_table_from_generator(name, generator, options) click to toggle source

Create a partition of another table, used when the create_table with the :partition_of option is given.

     # File lib/sequel/adapters/shared/postgres.rb
1386 def create_partition_of_table_from_generator(name, generator, options)
1387   execute_ddl(create_partition_of_table_sql(name, generator, options))
1388 end
create_partition_of_table_sql(name, generator, options) click to toggle source

SQL for creating a partition of another table.

     # File lib/sequel/adapters/shared/postgres.rb
1391 def create_partition_of_table_sql(name, generator, options)
1392   sql = create_table_prefix_sql(name, options).dup
1393 
1394   sql << " PARTITION OF #{quote_schema_table(options[:partition_of])}"
1395 
1396   case generator.partition_type
1397   when :range
1398     from, to = generator.range
1399     sql << " FOR VALUES FROM #{literal(from)} TO #{literal(to)}"
1400   when :list
1401     sql << " FOR VALUES IN #{literal(generator.list)}"
1402   when :hash
1403     mod, remainder = generator.hash_values
1404     sql << " FOR VALUES WITH (MODULUS #{literal(mod)}, REMAINDER #{literal(remainder)})"
1405   else # when :default
1406     sql << " DEFAULT"
1407   end
1408 
1409   sql << create_table_suffix_sql(name, options)
1410 
1411   sql
1412 end
create_schema_sql(name, opts=OPTS) click to toggle source

SQL for creating a schema.

     # File lib/sequel/adapters/shared/postgres.rb
1415 def create_schema_sql(name, opts=OPTS)
1416   "CREATE SCHEMA #{'IF NOT EXISTS ' if opts[:if_not_exists]}#{quote_identifier(name)}#{" AUTHORIZATION #{literal(opts[:owner])}" if opts[:owner]}"
1417 end
create_table_as_sql(name, sql, options) click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1473 def create_table_as_sql(name, sql, options)
1474   result = create_table_prefix_sql name, options
1475   if on_commit = options[:on_commit]
1476     result += " ON COMMIT #{ON_COMMIT[on_commit]}"
1477   end
1478   result += " AS #{sql}"
1479 end
create_table_generator_class() click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1481 def create_table_generator_class
1482   Postgres::CreateTableGenerator
1483 end
create_table_prefix_sql(name, options) click to toggle source

DDL statement for creating a table with the given name, columns, and options

     # File lib/sequel/adapters/shared/postgres.rb
1420 def create_table_prefix_sql(name, options)
1421   prefix_sql = if options[:temp]
1422     raise(Error, "can't provide both :temp and :unlogged to create_table") if options[:unlogged]
1423     raise(Error, "can't provide both :temp and :foreign to create_table") if options[:foreign]
1424     temporary_table_sql
1425   elsif options[:foreign]
1426     raise(Error, "can't provide both :foreign and :unlogged to create_table") if options[:unlogged]
1427     'FOREIGN '
1428   elsif options.fetch(:unlogged){typecast_value_boolean(@opts[:unlogged_tables_default])}
1429     'UNLOGGED '
1430   end
1431 
1432   "CREATE #{prefix_sql}TABLE#{' IF NOT EXISTS' if options[:if_not_exists]} #{options[:temp] ? quote_identifier(name) : quote_schema_table(name)}"
1433 end
create_table_sql(name, generator, options) click to toggle source

SQL for creating a table with PostgreSQL specific options

     # File lib/sequel/adapters/shared/postgres.rb
1436 def create_table_sql(name, generator, options)
1437   "#{super}#{create_table_suffix_sql(name, options)}"
1438 end
create_table_suffix_sql(name, options) click to toggle source

Handle various PostgreSQl specific table extensions such as inheritance, partitioning, tablespaces, and foreign tables.

     # File lib/sequel/adapters/shared/postgres.rb
1442 def create_table_suffix_sql(name, options)
1443   sql = String.new
1444 
1445   if inherits = options[:inherits]
1446     sql << " INHERITS (#{Array(inherits).map{|t| quote_schema_table(t)}.join(', ')})"
1447   end
1448 
1449   if partition_by = options[:partition_by]
1450     sql << " PARTITION BY #{options[:partition_type]||'RANGE'} #{literal(Array(partition_by))}"
1451   end
1452 
1453   if on_commit = options[:on_commit]
1454     raise(Error, "can't provide :on_commit without :temp to create_table") unless options[:temp]
1455     raise(Error, "unsupported on_commit option: #{on_commit.inspect}") unless ON_COMMIT.has_key?(on_commit)
1456     sql << " ON COMMIT #{ON_COMMIT[on_commit]}"
1457   end
1458 
1459   if tablespace = options[:tablespace]
1460     sql << " TABLESPACE #{quote_identifier(tablespace)}"
1461   end
1462 
1463   if server = options[:foreign]
1464     sql << " SERVER #{quote_identifier(server)}"
1465     if foreign_opts = options[:options]
1466       sql << " OPTIONS (#{foreign_opts.map{|k, v| "#{k} #{literal(v.to_s)}"}.join(', ')})"
1467     end
1468   end
1469 
1470   sql
1471 end
create_trigger_sql(table, name, function, opts=OPTS) click to toggle source

SQL for creating a database trigger.

     # File lib/sequel/adapters/shared/postgres.rb
1486 def create_trigger_sql(table, name, function, opts=OPTS)
1487   events = opts[:events] ? Array(opts[:events]) : [:insert, :update, :delete]
1488   whence = opts[:after] ? 'AFTER' : 'BEFORE'
1489   if filter = opts[:when]
1490     raise Error, "Trigger conditions are not supported for this database" unless supports_trigger_conditions?
1491     filter = " WHEN #{filter_expr(filter)}"
1492   end
1493   "CREATE #{'OR REPLACE ' if opts[:replace]}TRIGGER #{name} #{whence} #{events.map{|e| e.to_s.upcase}.join(' OR ')} ON #{quote_schema_table(table)}#{' FOR EACH ROW' if opts[:each_row]}#{filter} EXECUTE PROCEDURE #{function}(#{Array(opts[:args]).map{|a| literal(a)}.join(', ')})"
1494 end
create_view_prefix_sql(name, options) click to toggle source

DDL fragment for initial part of CREATE VIEW statement

     # File lib/sequel/adapters/shared/postgres.rb
1497 def create_view_prefix_sql(name, options)
1498   sql = create_view_sql_append_columns("CREATE #{'OR REPLACE 'if options[:replace]}#{'TEMPORARY 'if options[:temp]}#{'RECURSIVE ' if options[:recursive]}#{'MATERIALIZED ' if options[:materialized]}VIEW #{quote_schema_table(name)}", options[:columns] || options[:recursive])
1499 
1500   if options[:security_invoker]
1501     sql += " WITH (security_invoker)"
1502   end
1503 
1504   if tablespace = options[:tablespace]
1505     sql += " TABLESPACE #{quote_identifier(tablespace)}"
1506   end
1507 
1508   sql
1509 end
database_error_regexps() click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1315 def database_error_regexps
1316   DATABASE_ERROR_REGEXPS
1317 end
database_specific_error_class_from_sqlstate(sqlstate) click to toggle source
Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1291 def database_specific_error_class_from_sqlstate(sqlstate)
1292   if sqlstate == '23P01'
1293     ExclusionConstraintViolation
1294   elsif sqlstate == '40P01'
1295     SerializationFailure
1296   elsif sqlstate == '55P03'
1297     DatabaseLockTimeout
1298   else
1299     super
1300   end
1301 end
drop_function_sql(name, opts=OPTS) click to toggle source

SQL for dropping a function from the database.

     # File lib/sequel/adapters/shared/postgres.rb
1512 def drop_function_sql(name, opts=OPTS)
1513   "DROP FUNCTION#{' IF EXISTS' if opts[:if_exists]} #{name}#{sql_function_args(opts[:args])}#{' CASCADE' if opts[:cascade]}"
1514 end
drop_index_sql(table, op) click to toggle source

Support :if_exists, :cascade, and :concurrently options.

     # File lib/sequel/adapters/shared/postgres.rb
1517 def drop_index_sql(table, op)
1518   sch, _ = schema_and_table(table)
1519   "DROP INDEX#{' CONCURRENTLY' if op[:concurrently]}#{' IF EXISTS' if op[:if_exists]} #{"#{quote_identifier(sch)}." if sch}#{quote_identifier(op[:name] || default_index_name(table, op[:columns]))}#{' CASCADE' if op[:cascade]}"
1520 end
drop_language_sql(name, opts=OPTS) click to toggle source

SQL for dropping a procedural language from the database.

     # File lib/sequel/adapters/shared/postgres.rb
1523 def drop_language_sql(name, opts=OPTS)
1524   "DROP LANGUAGE#{' IF EXISTS' if opts[:if_exists]} #{name}#{' CASCADE' if opts[:cascade]}"
1525 end
drop_schema_sql(name, opts=OPTS) click to toggle source

SQL for dropping a schema from the database.

     # File lib/sequel/adapters/shared/postgres.rb
1528 def drop_schema_sql(name, opts=OPTS)
1529   "DROP SCHEMA#{' IF EXISTS' if opts[:if_exists]} #{quote_identifier(name)}#{' CASCADE' if opts[:cascade]}"
1530 end
drop_table_sql(name, options) click to toggle source

Support :foreign tables

     # File lib/sequel/adapters/shared/postgres.rb
1538 def drop_table_sql(name, options)
1539   "DROP#{' FOREIGN' if options[:foreign]} TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_schema_table(name)}#{' CASCADE' if options[:cascade]}"
1540 end
drop_trigger_sql(table, name, opts=OPTS) click to toggle source

SQL for dropping a trigger from the database.

     # File lib/sequel/adapters/shared/postgres.rb
1533 def drop_trigger_sql(table, name, opts=OPTS)
1534   "DROP TRIGGER#{' IF EXISTS' if opts[:if_exists]} #{name} ON #{quote_schema_table(table)}#{' CASCADE' if opts[:cascade]}"
1535 end
drop_view_sql(name, opts=OPTS) click to toggle source

SQL for dropping a view from the database.

     # File lib/sequel/adapters/shared/postgres.rb
1543 def drop_view_sql(name, opts=OPTS)
1544   "DROP #{'MATERIALIZED ' if opts[:materialized]}VIEW#{' IF EXISTS' if opts[:if_exists]} #{quote_schema_table(name)}#{' CASCADE' if opts[:cascade]}"
1545 end
filter_schema(ds, opts) click to toggle source

If opts includes a :schema option, use it, otherwise restrict the filter to only the currently visible schemas.

     # File lib/sequel/adapters/shared/postgres.rb
1549 def filter_schema(ds, opts)
1550   expr = if schema = opts[:schema]
1551     if schema.is_a?(SQL::Identifier)
1552       schema.value.to_s
1553     else
1554       schema.to_s
1555     end
1556   else
1557     Sequel.function(:any, Sequel.function(:current_schemas, false))
1558   end
1559   ds.where{{pg_namespace[:nspname]=>expr}}
1560 end
index_definition_sql(table_name, index) click to toggle source
     # File lib/sequel/adapters/shared/postgres.rb
1562 def index_definition_sql(table_name, index)
1563   cols = index[:columns]
1564   index_name = index[:name] || default_index_name(table_name, cols)
1565 
1566   expr = if o = index[:opclass]
1567     "(#{Array(cols).map{|c| "#{literal(c)} #{o}"}.join(', ')})"
1568   else
1569     literal(Array(cols))
1570   end
1571 
1572   if_not_exists = " IF NOT EXISTS" if index[:if_not_exists]
1573   unique = "UNIQUE " if index[:unique]
1574   index_type = index[:type]
1575   filter = index[:where] || index[:filter]
1576   filter = " WHERE #{filter_expr(filter)}" if filter
1577   nulls_distinct = " NULLS#{' NOT' if index[:nulls_distinct] == false} DISTINCT" unless index[:nulls_distinct].nil?
1578 
1579   case index_type
1580   when :full_text
1581     expr = "(to_tsvector(#{literal(index[:language] || 'simple')}::regconfig, #{literal(dataset.send(:full_text_string_join, cols))}))"
1582     index_type = index[:index_type] || :gin
1583   when :spatial
1584     index_type = :gist
1585   end
1586 
1587   "CREATE #{unique}INDEX#{' CONCURRENTLY' if index[:concurrently]}#{if_not_exists} #{quote_identifier(index_name)} ON #{quote_schema_table(table_name)} #{"USING #{index_type} " if index_type}#{expr}#{" INCLUDE #{literal(Array(index[:include]))}" if index[:include]}#{nulls_distinct}#{" TABLESPACE #{quote_identifier(index[:tablespace])}" if index[:tablespace]}#{filter}"
1588 end
initialize_postgres_adapter() click to toggle source

Setup datastructures shared by all postgres adapters.

     # File lib/sequel/adapters/shared/postgres.rb
1591 def initialize_postgres_adapter
1592   @primary_keys = {}
1593   @primary_key_sequences = {}
1594   @supported_types = {}
1595   procs = @conversion_procs = CONVERSION_PROCS.dup
1596   procs[1184] = procs[1114] = method(:to_application_timestamp)
1597 end
pg_class_relname(type, opts) { || ... } click to toggle source

Backbone of the tables and views support.

     # File lib/sequel/adapters/shared/postgres.rb
1600 def pg_class_relname(type, opts)
1601   ds = metadata_dataset.from(:pg_class).where(:relkind=>type).select(:relname).server(opts[:server]).join(:pg_namespace, :oid=>:relnamespace)
1602   ds = filter_schema(ds, opts)
1603   m = output_identifier_meth
1604   if defined?(yield)
1605     yield(ds)
1606   elsif opts[:qualify]
1607     ds.select_append{pg_namespace[:nspname]}.map{|r| Sequel.qualify(m.call(r[:nspname]).to_s, m.call(r[:relname]).to_s)}
1608   else
1609     ds.map{|r| m.call(r[:relname])}
1610   end
1611 end
regclass_oid(expr, opts=OPTS) click to toggle source

Return an expression the oid for the table expr. Used by the metadata parsing code to disambiguate unqualified tables.

     # File lib/sequel/adapters/shared/postgres.rb
1615 def regclass_oid(expr, opts=OPTS)
1616   if expr.is_a?(String) && !expr.is_a?(LiteralString)
1617     expr = Sequel.identifier(expr)
1618   end
1619 
1620   sch, table = schema_and_table(expr)
1621   sch ||= opts[:schema]
1622   if sch
1623     expr = Sequel.qualify(sch, table)
1624   end
1625   
1626   expr = if ds = opts[:dataset]
1627     ds.literal(expr)
1628   else
1629     literal(expr)
1630   end
1631 
1632   Sequel.cast(expr.to_s,:regclass).cast(:oid)
1633 end
remove_cached_schema(table) click to toggle source

Remove the cached entries for primary keys and sequences when a table is changed.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1636 def remove_cached_schema(table)
1637   tab = quote_schema_table(table)
1638   Sequel.synchronize do
1639     @primary_keys.delete(tab)
1640     @primary_key_sequences.delete(tab)
1641   end
1642   super
1643 end
rename_table_sql(name, new_name) click to toggle source

SQL DDL statement for renaming a table. PostgreSQL doesn’t allow you to change a table’s schema in a rename table operation, so specifying a new schema in new_name will not have an effect.

     # File lib/sequel/adapters/shared/postgres.rb
1647 def rename_table_sql(name, new_name)
1648   "ALTER TABLE #{quote_schema_table(name)} RENAME TO #{quote_identifier(schema_and_table(new_name).last)}"
1649 end
schema_array_type(db_type) click to toggle source

The schema :type entry to use for array types.

     # File lib/sequel/adapters/shared/postgres.rb
1664 def schema_array_type(db_type)
1665   :array
1666 end
schema_column_type(db_type) click to toggle source

Handle interval and citext types.

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1652 def schema_column_type(db_type)
1653   case db_type
1654   when /\Ainterval\z/io
1655     :interval
1656   when /\Acitext\z/io
1657     :string
1658   else
1659     super
1660   end
1661 end
schema_composite_type(db_type) click to toggle source

The schema :type entry to use for row/composite types.

     # File lib/sequel/adapters/shared/postgres.rb
1669 def schema_composite_type(db_type)
1670   :composite
1671 end
schema_enum_type(db_type) click to toggle source

The schema :type entry to use for enum types.

     # File lib/sequel/adapters/shared/postgres.rb
1674 def schema_enum_type(db_type)
1675   :enum
1676 end
schema_multirange_type(db_type) click to toggle source

The schema :type entry to use for multirange types.

     # File lib/sequel/adapters/shared/postgres.rb
1684 def schema_multirange_type(db_type)
1685   :multirange
1686 end
schema_parse_table(table_name, opts) click to toggle source

The dataset used for parsing table schemas, using the pg_* system catalogs.

     # File lib/sequel/adapters/shared/postgres.rb
1701 def schema_parse_table(table_name, opts)
1702   m = output_identifier_meth(opts[:dataset])
1703 
1704   _schema_ds.where_all(Sequel[:pg_class][:oid]=>regclass_oid(table_name, opts)).map do |row|
1705     row[:default] = nil if blank_object?(row[:default])
1706     if row[:base_oid]
1707       row[:domain_oid] = row[:oid]
1708       row[:oid] = row.delete(:base_oid)
1709       row[:db_domain_type] = row[:db_type]
1710       row[:db_type] = row.delete(:db_base_type)
1711     else
1712       row.delete(:base_oid)
1713       row.delete(:db_base_type)
1714     end
1715 
1716     db_type = row[:db_type]
1717     row[:type] = if row.delete(:is_array)
1718       schema_array_type(db_type)
1719     else
1720       send(TYPTYPE_METHOD_MAP[row.delete(:typtype)], db_type)
1721     end
1722     identity = row.delete(:attidentity)
1723     if row[:primary_key]
1724       row[:auto_increment] = !!(row[:default] =~ /\A(?:nextval)/i) || identity == 'a' || identity == 'd'
1725     end
1726 
1727     # :nocov:
1728     if server_version >= 90600
1729     # :nocov:
1730       case row[:oid]
1731       when 1082
1732         row[:min_value] = MIN_DATE
1733         row[:max_value] = MAX_DATE
1734       when 1184, 1114
1735         if Sequel.datetime_class == Time
1736           row[:min_value] = MIN_TIMESTAMP
1737           row[:max_value] = MAX_TIMESTAMP
1738         end
1739       end
1740     end
1741 
1742     [m.call(row.delete(:name)), row]
1743   end
1744 end
schema_range_type(db_type) click to toggle source

The schema :type entry to use for range types.

     # File lib/sequel/adapters/shared/postgres.rb
1679 def schema_range_type(db_type)
1680   :range
1681 end
set_transaction_isolation(conn, opts) click to toggle source

Set the transaction isolation level on the given connection

     # File lib/sequel/adapters/shared/postgres.rb
1747 def set_transaction_isolation(conn, opts)
1748   level = opts.fetch(:isolation, transaction_isolation_level)
1749   read_only = opts[:read_only]
1750   deferrable = opts[:deferrable]
1751   if level || !read_only.nil? || !deferrable.nil?
1752     sql = String.new
1753     sql << "SET TRANSACTION"
1754     sql << " ISOLATION LEVEL #{Sequel::Database::TRANSACTION_ISOLATION_LEVELS[level]}" if level
1755     sql << " READ #{read_only ? 'ONLY' : 'WRITE'}" unless read_only.nil?
1756     sql << " #{'NOT ' unless deferrable}DEFERRABLE" unless deferrable.nil?
1757     log_connection_execute(conn, sql)
1758   end
1759 end
sql_function_args(args) click to toggle source

Turns an array of argument specifiers into an SQL fragment used for function arguments. See create_function_sql.

     # File lib/sequel/adapters/shared/postgres.rb
1762 def sql_function_args(args)
1763   "(#{Array(args).map{|a| Array(a).reverse.join(' ')}.join(', ')})"
1764 end
supports_combining_alter_table_ops?() click to toggle source

PostgreSQL can combine multiple alter table ops into a single query.

     # File lib/sequel/adapters/shared/postgres.rb
1767 def supports_combining_alter_table_ops?
1768   true
1769 end
supports_create_or_replace_view?() click to toggle source

PostgreSQL supports CREATE OR REPLACE VIEW.

     # File lib/sequel/adapters/shared/postgres.rb
1772 def supports_create_or_replace_view?
1773   true
1774 end
type_literal_generic_bignum_symbol(column) click to toggle source

Handle bigserial type if :serial option is present

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1777 def type_literal_generic_bignum_symbol(column)
1778   column[:serial] ? :bigserial : super
1779 end
type_literal_generic_file(column) click to toggle source

PostgreSQL uses the bytea data type for blobs

     # File lib/sequel/adapters/shared/postgres.rb
1782 def type_literal_generic_file(column)
1783   :bytea
1784 end
type_literal_generic_integer(column) click to toggle source

Handle serial type if :serial option is present

Calls superclass method
     # File lib/sequel/adapters/shared/postgres.rb
1787 def type_literal_generic_integer(column)
1788   column[:serial] ? :serial : super
1789 end
type_literal_generic_string(column) click to toggle source

PostgreSQL prefers the text datatype. If a fixed size is requested, the char type is used. If the text type is specifically disallowed or there is a size specified, use the varchar type. Otherwise use the text type.

     # File lib/sequel/adapters/shared/postgres.rb
1795 def type_literal_generic_string(column)
1796   if column[:text]
1797     :text
1798   elsif column[:fixed]
1799     "char(#{column[:size]||default_string_column_size})"
1800   elsif column[:text] == false || column[:size]
1801     "varchar(#{column[:size]||default_string_column_size})"
1802   else
1803     :text
1804   end
1805 end
view_with_check_option_support() click to toggle source

PostgreSQL 9.4+ supports views with check option.

     # File lib/sequel/adapters/shared/postgres.rb
1808 def view_with_check_option_support
1809   # :nocov:
1810   :local if server_version >= 90400
1811   # :nocov:
1812 end