Module Sequel::Postgres::DatabaseMethods
In: lib/sequel/adapters/shared/postgres.rb

Methods shared by Database instances that connect to PostgreSQL.

Methods

Constants

PREPARED_ARG_PLACEHOLDER = LiteralString.new('$').freeze
RE_CURRVAL_ERROR = /currval of sequence "(.*)" is not yet defined in this session|relation "(.*)" does not exist/.freeze
FOREIGN_KEY_LIST_ON_DELETE_MAP = {'a'.freeze=>:no_action, 'r'.freeze=>:restrict, 'c'.freeze=>:cascade, 'n'.freeze=>:set_null, 'd'.freeze=>:set_default}.freeze
POSTGRES_DEFAULT_RE = /\A(?:B?('.*')::[^']+|\((-?\d+(?:\.\d+)?)\))\z/
UNLOGGED = 'UNLOGGED '.freeze
ON_COMMIT = { :drop => 'DROP', :delete_rows => 'DELETE ROWS', :preserve_rows => 'PRESERVE ROWS', }.freeze
SELECT_CUSTOM_SEQUENCE_SQL = (<<-end_sql SELECT name.nspname AS "schema", CASE WHEN split_part(def.adsrc, '''', 2) ~ '.' THEN substr(split_part(def.adsrc, '''', 2), strpos(split_part(def.adsrc, '''', 2), '.')+1) ELSE split_part(def.adsrc, '''', 2) END AS "sequence" FROM pg_class t JOIN pg_namespace name ON (t.relnamespace = name.oid) JOIN pg_attribute attr ON (t.oid = attrelid) JOIN pg_attrdef def ON (adrelid = attrelid AND adnum = attnum) JOIN pg_constraint cons ON (conrelid = adrelid AND adnum = conkey[1]) WHERE cons.contype = 'p' AND def.adsrc ~* 'nextval' end_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 = (<<-end_sql SELECT pg_attribute.attname AS pk FROM pg_class, pg_attribute, pg_index, pg_namespace WHERE pg_class.oid = pg_attribute.attrelid AND pg_class.relnamespace = pg_namespace.oid AND pg_class.oid = pg_index.indrelid AND pg_index.indkey[0] = pg_attribute.attnum AND pg_index.indisprimary = 't' end_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 = (<<-end_sql SELECT name.nspname AS "schema", seq.relname AS "sequence" FROM pg_class seq, pg_attribute attr, pg_depend dep, pg_namespace name, pg_constraint cons, pg_class t WHERE seq.oid = dep.objid AND seq.relnamespace = name.oid AND seq.relkind = 'S' AND attr.attrelid = dep.refobjid AND attr.attnum = dep.refobjsubid AND attr.attrelid = cons.conrelid AND attr.attnum = cons.conkey[1] AND attr.attrelid = t.oid AND cons.contype = 'p' end_sql   SQL fragment for getting sequence associated with table‘s primary key, assuming it was a serial primary key column.
VALID_CLIENT_MIN_MESSAGES = %w'DEBUG5 DEBUG4 DEBUG3 DEBUG2 DEBUG1 LOG NOTICE WARNING ERROR FATAL PANIC'.freeze
EXCLUSION_CONSTRAINT_SQL_STATE = '23P01'.freeze
DEADLOCK_SQL_STATE = '40P01'.freeze
DATABASE_ERROR_REGEXPS = [ # Add this check first, since otherwise it's possible for users to control # which exception class is generated. [/invalid input syntax/, DatabaseError], [/duplicate key value violates unique constraint/, UniqueConstraintViolation], [/violates foreign key constraint/, ForeignKeyConstraintViolation], [/violates check constraint/, CheckConstraintViolation], [/violates not-null constraint/, NotNullConstraintViolation], [/conflicting key value violates exclusion constraint/, ExclusionConstraintViolation], [/could not serialize access/, SerializationFailure], ].freeze

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 a conversion proc for a named type. This should be used for types without fixed OIDs, which includes all types that are not included in a default PostgreSQL installation. If a block is given, it is used as the conversion proc, otherwise the conversion proc is looked up in the PG_NAMED_TYPES hash.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 187
187:       def add_named_conversion_proc(name, &block)
188:         add_named_conversion_procs(conversion_procs, name=>(block || PG_NAMED_TYPES[name]))
189:       end

Commit an existing prepared transaction with the given transaction identifier string.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 193
193:       def commit_prepared_transaction(transaction_id, opts=OPTS)
194:         run("COMMIT PREPARED #{literal(transaction_id)}", opts)
195:       end

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.
: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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 217
217:       def create_function(name, definition, opts=OPTS)
218:         self << create_function_sql(name, definition, opts)
219:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 228
228:       def create_language(name, opts=OPTS)
229:         self << create_language_sql(name, opts)
230:       end

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)

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 237
237:       def create_schema(name, opts=OPTS)
238:         self << create_schema_sql(name, opts)
239:       end

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.
:when :A filter to use for the trigger

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 252
252:       def create_trigger(table, name, function, opts=OPTS)
253:         self << create_trigger_sql(table, name, function, opts)
254:       end

PostgreSQL uses the :postgres database type.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 257
257:       def database_type
258:         :postgres
259:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 266
266:       def do(code, opts=OPTS)
267:         language = opts[:language]
268:         run "DO #{"LANGUAGE #{literal(language.to_s)} " if language}#{literal(code)}"
269:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 277
277:       def drop_function(name, opts=OPTS)
278:         self << drop_function_sql(name, opts)
279:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 286
286:       def drop_language(name, opts=OPTS)
287:         self << drop_language_sql(name, opts)
288:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 295
295:       def drop_schema(name, opts=OPTS)
296:         self << drop_schema_sql(name, opts)
297:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 305
305:       def drop_trigger(table, name, opts=OPTS)
306:         self << drop_trigger_sql(table, name, opts)
307:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 311
311:       def foreign_key_list(table, opts=OPTS)
312:         m = output_identifier_meth
313:         schema, _ = opts.fetch(:schema, schema_and_table(table))
314:         range = 0...32
315: 
316:         base_ds = metadata_dataset.
317:           from(:pg_constraint___co).
318:           join(:pg_class___cl, :oid=>:conrelid).
319:           where(:cl__relkind=>'r', :co__contype=>'f', :cl__oid=>regclass_oid(table))
320: 
321:         # We split the parsing into two separate queries, which are merged manually later.
322:         # This is because PostgreSQL stores both the referencing and referenced columns in
323:         # arrays, and I don't know a simple way to not create a cross product, as PostgreSQL
324:         # doesn't appear to have a function that takes an array and element and gives you
325:         # the index of that element in the array.
326: 
327:         ds = base_ds.
328:           join(:pg_attribute___att, :attrelid=>:oid, :attnum=>SQL::Function.new(:ANY, :co__conkey)).
329:           order(:co__conname, SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(:co__conkey, [x]), x]}, 32, :att__attnum)).
330:           select(:co__conname___name, :att__attname___column, :co__confupdtype___on_update, :co__confdeltype___on_delete,
331:                  SQL::BooleanExpression.new(:AND, :co__condeferrable, :co__condeferred).as(:deferrable))
332: 
333:         ref_ds = base_ds.
334:           join(:pg_class___cl2, :oid=>:co__confrelid).
335:           join(:pg_attribute___att2, :attrelid=>:oid, :attnum=>SQL::Function.new(:ANY, :co__confkey)).
336:           order(:co__conname, SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(:co__confkey, [x]), x]}, 32, :att2__attnum)).
337:           select(:co__conname___name, :cl2__relname___table, :att2__attname___refcolumn)
338: 
339:         # If a schema is given, we only search in that schema, and the returned :table
340:         # entry is schema qualified as well.
341:         if schema
342:           ref_ds = ref_ds.join(:pg_namespace___nsp2, :oid=>:cl2__relnamespace).
343:             select_more(:nsp2__nspname___schema)
344:         end
345: 
346:         h = {}
347:         fklod_map = FOREIGN_KEY_LIST_ON_DELETE_MAP 
348:         ds.each do |row|
349:           if r = h[row[:name]]
350:             r[:columns] << m.call(row[:column])
351:           else
352:             h[row[:name]] = {:name=>m.call(row[:name]), :columns=>[m.call(row[:column])], :on_update=>fklod_map[row[:on_update]], :on_delete=>fklod_map[row[:on_delete]], :deferrable=>row[:deferrable]}
353:           end
354:         end
355:         ref_ds.each do |row|
356:           r = h[row[:name]]
357:           r[:table] ||= schema ? SQL::QualifiedIdentifier.new(m.call(row[:schema]), m.call(row[:table])) : m.call(row[:table])
358:           r[:key] ||= []
359:           r[:key] << m.call(row[:refcolumn])
360:         end
361:         h.values
362:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 365
365:       def indexes(table, opts=OPTS)
366:         m = output_identifier_meth
367:         range = 0...32
368:         attnums = server_version >= 80100 ? SQL::Function.new(:ANY, :ind__indkey) : range.map{|x| SQL::Subscript.new(:ind__indkey, [x])}
369:         ds = metadata_dataset.
370:           from(:pg_class___tab).
371:           join(:pg_index___ind, :indrelid=>:oid).
372:           join(:pg_class___indc, :oid=>:indexrelid).
373:           join(:pg_attribute___att, :attrelid=>:tab__oid, :attnum=>attnums).
374:           left_join(:pg_constraint___con, :conname=>:indc__relname).
375:           filter(:indc__relkind=>'i', :ind__indisprimary=>false, :indexprs=>nil, :indpred=>nil, :indisvalid=>true, :tab__oid=>regclass_oid(table, opts)).
376:           order(:indc__relname, SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(:ind__indkey, [x]), x]}, 32, :att__attnum)).
377:           select(:indc__relname___name, :ind__indisunique___unique, :att__attname___column, :con__condeferrable___deferrable)
378: 
379:         ds.filter!(:indisready=>true, :indcheckxmin=>false) if server_version >= 80300
380: 
381:         indexes = {}
382:         ds.each do |r|
383:           i = indexes[m.call(r[:name])] ||= {:columns=>[], :unique=>r[:unique], :deferrable=>r[:deferrable]}
384:           i[:columns] << m.call(r[:column])
385:         end
386:         indexes
387:       end

Dataset containing all current database locks

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 390
390:       def locks
391:         dataset.from(:pg_class).join(:pg_locks, :relation=>:relfilenode).select(:pg_class__relname, Sequel::SQL::ColumnAll.new(:pg_locks))
392:       end

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.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 400
400:       def notify(channel, opts=OPTS)
401:         sql = String.new
402:         sql << "NOTIFY "
403:         dataset.send(:identifier_append, sql, channel)
404:         if payload = opts[:payload]
405:           sql << ", "
406:           dataset.literal_append(sql, payload.to_s)
407:         end
408:         execute_ddl(sql, opts)
409:       end

Return primary key for the given table.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 412
412:       def primary_key(table, opts=OPTS)
413:         quoted_table = quote_schema_table(table)
414:         Sequel.synchronize{return @primary_keys[quoted_table] if @primary_keys.has_key?(quoted_table)}
415:         sql = "#{SELECT_PK_SQL} AND pg_class.oid = #{literal(regclass_oid(table, opts))}"
416:         value = fetch(sql).single_value
417:         Sequel.synchronize{@primary_keys[quoted_table] = value}
418:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 421
421:       def primary_key_sequence(table, opts=OPTS)
422:         quoted_table = quote_schema_table(table)
423:         Sequel.synchronize{return @primary_key_sequences[quoted_table] if @primary_key_sequences.has_key?(quoted_table)}
424:         sql = "#{SELECT_SERIAL_SEQUENCE_SQL} AND t.oid = #{literal(regclass_oid(table, opts))}"
425:         if pks = fetch(sql).single_record
426:           value = literal(SQL::QualifiedIdentifier.new(pks[:schema], pks[:sequence]))
427:           Sequel.synchronize{@primary_key_sequences[quoted_table] = value}
428:         else
429:           sql = "#{SELECT_CUSTOM_SEQUENCE_SQL} AND t.oid = #{literal(regclass_oid(table, opts))}"
430:           if pks = fetch(sql).single_record
431:             value = literal(SQL::QualifiedIdentifier.new(pks[:schema], LiteralString.new(pks[:sequence])))
432:             Sequel.synchronize{@primary_key_sequences[quoted_table] = value}
433:           end
434:         end
435:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 443
443:       def refresh_view(name, opts=OPTS)
444:         run "REFRESH MATERIALIZED VIEW#{' CONCURRENTLY' if opts[:concurrently]} #{quote_schema_table(name)}"
445:       end

Reset the database‘s conversion procs, requires a server query if there any named types.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 449
449:       def reset_conversion_procs
450:         @conversion_procs = get_conversion_procs
451:         conversion_procs_updated
452:         @conversion_procs
453:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 457
457:       def reset_primary_key_sequence(table)
458:         return unless seq = primary_key_sequence(table)
459:         pk = SQL::Identifier.new(primary_key(table))
460:         db = self
461:         seq_ds = db.from(LiteralString.new(seq))
462:         s, t = schema_and_table(table)
463:         table = Sequel.qualify(s, t) if s
464:         get{setval(seq, db[table].select{coalesce(max(pk)+seq_ds.select{:increment_by}, seq_ds.select(:min_value))}, false)}
465:       end

Rollback an existing prepared transaction with the given transaction identifier string.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 469
469:       def rollback_prepared_transaction(transaction_id, opts=OPTS)
470:         run("ROLLBACK PREPARED #{literal(transaction_id)}", opts)
471:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 475
475:       def serial_primary_key_options
476:         {:primary_key => true, :serial => true, :type=>Integer}
477:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 480
480:       def server_version(server=nil)
481:         return @server_version if @server_version
482:         @server_version = synchronize(server) do |conn|
483:           (conn.server_version rescue nil) if conn.respond_to?(:server_version)
484:         end
485:         unless @server_version
486:           @server_version = if m = /PostgreSQL (\d+)\.(\d+)(?:(?:rc\d+)|\.(\d+))?/.match(fetch('SELECT version()').single_value)
487:             (m[1].to_i * 10000) + (m[2].to_i * 100) + m[3].to_i
488:           else
489:             0
490:           end
491:         end
492:         warn 'Sequel no longer supports PostgreSQL <8.2, some things may not work' if @server_version < 80200
493:         @server_version
494:       end

PostgreSQL supports CREATE TABLE IF NOT EXISTS on 9.1+

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 497
497:       def supports_create_table_if_not_exists?
498:         server_version >= 90100
499:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 502
502:       def supports_deferrable_constraints?
503:         server_version >= 90000
504:       end

PostgreSQL supports deferrable foreign key constraints.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 507
507:       def supports_deferrable_foreign_key_constraints?
508:         true
509:       end

PostgreSQL supports DROP TABLE IF EXISTS

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 512
512:       def supports_drop_table_if_exists?
513:         true
514:       end

PostgreSQL supports partial indexes.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 517
517:       def supports_partial_indexes?
518:         true
519:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 528
528:       def supports_prepared_transactions?
529:         return @supports_prepared_transactions if defined?(@supports_prepared_transactions)
530:         @supports_prepared_transactions = self['SHOW max_prepared_transactions'].get.to_i > 0
531:       end

PostgreSQL supports savepoints

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 534
534:       def supports_savepoints?
535:         true
536:       end

PostgreSQL supports transaction isolation levels

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 539
539:       def supports_transaction_isolation_levels?
540:         true
541:       end

PostgreSQL supports transaction DDL statements.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 544
544:       def supports_transactional_ddl?
545:         true
546:       end

PostgreSQL 9.0+ supports trigger conditions.

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 522
522:       def supports_trigger_conditions?
523:         server_version >= 90000
524:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 557
557:       def tables(opts=OPTS, &block)
558:         pg_class_relname('r', opts, &block)
559:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 563
563:       def type_supported?(type)
564:         @supported_types ||= {}
565:         @supported_types.fetch(type){@supported_types[type] = (from(:pg_type).filter(:typtype=>'b', :typname=>type.to_s).count > 0)}
566:       end

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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 575
575:       def values(v)
576:         @default_dataset.clone(:values=>v)
577:       end

Array of symbols specifying view names in the current database.

Options:

: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

[Source]

     # File lib/sequel/adapters/shared/postgres.rb, line 586
586:       def views(opts=OPTS)
587:         pg_class_relname('v', opts)
588:       end

[Validate]