Module | Sequel::DatabaseMethods |
In: |
lib/sequel/adapters/shared/postgres.rb
|
PREPARED_ARG_PLACEHOLDER | = | LiteralString.new('$').freeze | ||
FOREIGN_KEY_LIST_ON_DELETE_MAP | = | {'a'=>:no_action, 'r'=>:restrict, 'c'=>:cascade, 'n'=>:set_null, 'd'=>:set_default}.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.each(&: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], [/could not obtain lock on row in relation/, DatabaseLockTimeout], ].freeze |
conversion_procs | [R] | A hash of conversion procs, keyed by type integer (oid) and having callable values for the conversion proc for that type. |
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, line 201 201: def add_conversion_proc(oid, callable=Proc.new) 202: conversion_procs[oid] = callable 203: end
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, line 208 208: def add_named_conversion_proc(name, &block) 209: unless oid = from(:pg_type).where(:typtype=>['b', 'e'], :typname=>name.to_s).get(:oid) 210: raise Error, "No matching type in pg_type for #{name.inspect}" 211: end 212: add_conversion_proc(oid, block) 213: end
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 |
# File lib/sequel/adapters/shared/postgres.rb, line 223 223: def check_constraints(table) 224: m = output_identifier_meth 225: 226: rows = metadata_dataset. 227: from{pg_constraint.as(:co)}. 228: join(Sequel[:pg_attribute].as(:att), :attrelid=>:conrelid, :attnum=>SQL::Function.new(:ANY, Sequel[:co][:conkey])). 229: where(:conrelid=>regclass_oid(table), :contype=>'c'). 230: select{[co[:conname].as(:constraint), att[:attname].as(:column), pg_get_constraintdef(co[:oid]).as(:definition)]} 231: 232: hash = {} 233: rows.each do |row| 234: constraint = m.call(row[:constraint]) 235: if entry = hash[constraint] 236: entry[:columns] << m.call(row[:column]) 237: else 238: hash[constraint] = {:definition=>row[:definition], :columns=>[m.call(row[:column])]} 239: end 240: end 241: 242: hash 243: end
# File lib/sequel/adapters/shared/postgres.rb, line 215 215: def commit_prepared_transaction(transaction_id, opts=OPTS) 216: run("COMMIT PREPARED #{literal(transaction_id)}", opts) 217: end
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):
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, line 263 263: def convert_serial_to_identity(table, opts=OPTS) 264: raise Error, "convert_serial_to_identity is only supported on PostgreSQL 10.2+" unless server_version >= 100002 265: 266: server = opts[:server] 267: server_hash = server ? {:server=>server} : OPTS 268: ds = dataset 269: ds = ds.server(server) if server 270: 271: raise Error, "convert_serial_to_identity requires superuser permissions" unless ds.get{current_setting('is_superuser')} == 'on' 272: 273: table_oid = regclass_oid(table) 274: im = input_identifier_meth 275: unless column = im.call(opts[:column] || ((sch = schema(table).find{|_, sc| sc[:primary_key] && sc[:auto_increment]}) && sch[0])) 276: raise Error, "could not determine column to convert from serial to identity automatically" 277: end 278: 279: column_num = ds.from(:pg_attribute). 280: where(:attrelid=>table_oid, :attname=>column). 281: get(:attnum) 282: 283: pg_class = Sequel.cast('pg_class', :regclass) 284: res = ds.from(:pg_depend). 285: where(:refclassid=>pg_class, :refobjid=>table_oid, :refobjsubid=>column_num, :classid=>pg_class, :objsubid=>0, :deptype=>%w'a i'). 286: select_map([:objid, Sequel.as({:deptype=>'i'}, :v)]) 287: 288: case res.length 289: when 0 290: raise Error, "unable to find related sequence when converting serial to identity" 291: when 1 292: seq_oid, already_identity = res.first 293: else 294: raise Error, "more than one linked sequence found when converting serial to identity" 295: end 296: 297: return if already_identity 298: 299: transaction(server_hash) do 300: run("ALTER TABLE #{quote_schema_table(table)} ALTER COLUMN #{quote_identifier(column)} DROP DEFAULT", server_hash) 301: 302: ds.from(:pg_depend). 303: where(:classid=>pg_class, :objid=>seq_oid, :objsubid=>0, :deptype=>'a'). 304: update(:deptype=>'i') 305: 306: ds.from(:pg_attribute). 307: where(:attrelid=>table_oid, :attname=>column). 308: update(:attidentity=>'d') 309: end 310: 311: remove_cached_schema(table) 312: nil 313: 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:
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# File lib/sequel/adapters/shared/postgres.rb, line 335 335: def create_function(name, definition, opts=OPTS) 336: self << create_function_sql(name, definition, opts) 337: end
Create the procedural language in the database. Arguments:
name : | Name of the procedural language (e.g. plpgsql) | ||||||||
opts : | options hash:
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# File lib/sequel/adapters/shared/postgres.rb, line 346 346: def create_language(name, opts=OPTS) 347: self << create_language_sql(name, opts) 348: end
Create a schema in the database. Arguments:
name : | Name of the schema (e.g. admin) | ||||
opts : | options hash:
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# File lib/sequel/adapters/shared/postgres.rb, line 355 355: def create_schema(name, opts=OPTS) 356: self << create_schema_sql(name, opts) 357: 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:
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# File lib/sequel/adapters/shared/postgres.rb, line 370 370: def create_trigger(table, name, function, opts=OPTS) 371: self << create_trigger_sql(table, name, function, opts) 372: end
# File lib/sequel/adapters/shared/postgres.rb, line 374 374: def database_type 375: :postgres 376: 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. |
# File lib/sequel/adapters/shared/postgres.rb, line 383 383: def do(code, opts=OPTS) 384: language = opts[:language] 385: run "DO #{"LANGUAGE #{literal(language.to_s)} " if language}#{literal(code)}" 386: end
Drops the function from the database. Arguments:
name : | name of the function to drop | ||||||
opts : | options hash:
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# File lib/sequel/adapters/shared/postgres.rb, line 394 394: def drop_function(name, opts=OPTS) 395: self << drop_function_sql(name, opts) 396: end
Drops a procedural language from the database. Arguments:
name : | name of the procedural language to drop | ||||
opts : | options hash:
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# File lib/sequel/adapters/shared/postgres.rb, line 403 403: def drop_language(name, opts=OPTS) 404: self << drop_language_sql(name, opts) 405: end
Drops a schema from the database. Arguments:
name : | name of the schema to drop | ||||
opts : | options hash:
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# File lib/sequel/adapters/shared/postgres.rb, line 412 412: def drop_schema(name, opts=OPTS) 413: self << drop_schema_sql(name, opts) 414: 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:
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# File lib/sequel/adapters/shared/postgres.rb, line 422 422: def drop_trigger(table, name, opts=OPTS) 423: self << drop_trigger_sql(table, name, opts) 424: end
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, line 436 436: def foreign_key_list(table, opts=OPTS) 437: m = output_identifier_meth 438: schema, _ = opts.fetch(:schema, schema_and_table(table)) 439: oid = regclass_oid(table) 440: reverse = opts[:reverse] 441: 442: if reverse 443: ctable = Sequel[:att2] 444: cclass = Sequel[:cl2] 445: rtable = Sequel[:att] 446: rclass = Sequel[:cl] 447: else 448: ctable = Sequel[:att] 449: cclass = Sequel[:cl] 450: rtable = Sequel[:att2] 451: rclass = Sequel[:cl2] 452: end 453: 454: if server_version >= 90500 455: cpos = Sequel.expr{array_position(co[:conkey], ctable[:attnum])} 456: rpos = Sequel.expr{array_position(co[:confkey], rtable[:attnum])} 457: else 458: range = 0...32 459: cpos = Sequel.expr{SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(co[:conkey], [x]), x]}, 32, ctable[:attnum])} 460: rpos = Sequel.expr{SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(co[:confkey], [x]), x]}, 32, rtable[:attnum])} 461: end 462: 463: ds = metadata_dataset. 464: from{pg_constraint.as(:co)}. 465: join(Sequel[:pg_class].as(cclass), :oid=>:conrelid). 466: join(Sequel[:pg_attribute].as(ctable), :attrelid=>:oid, :attnum=>SQL::Function.new(:ANY, Sequel[:co][:conkey])). 467: join(Sequel[:pg_class].as(rclass), :oid=>Sequel[:co][:confrelid]). 468: join(Sequel[:pg_attribute].as(rtable), :attrelid=>:oid, :attnum=>SQL::Function.new(:ANY, Sequel[:co][:confkey])). 469: join(Sequel[:pg_namespace].as(:nsp), :oid=>Sequel[:cl2][:relnamespace]). 470: order{[co[:conname], cpos]}. 471: where{{ 472: cl[:relkind]=>'r', 473: co[:contype]=>'f', 474: cl[:oid]=>oid, 475: cpos=>rpos 476: }}. 477: select{[ 478: co[:conname].as(:name), 479: ctable[:attname].as(:column), 480: co[:confupdtype].as(:on_update), 481: co[:confdeltype].as(:on_delete), 482: cl2[:relname].as(:table), 483: rtable[:attname].as(:refcolumn), 484: SQL::BooleanExpression.new(:AND, co[:condeferrable], co[:condeferred]).as(:deferrable), 485: nsp[:nspname].as(:schema) 486: ]} 487: 488: if reverse 489: ds = ds.order_append(Sequel[:nsp][:nspname], Sequel[:cl2][:relname]) 490: end 491: 492: h = {} 493: fklod_map = FOREIGN_KEY_LIST_ON_DELETE_MAP 494: 495: ds.each do |row| 496: if reverse 497: key = [row[:schema], row[:table], row[:name]] 498: else 499: key = row[:name] 500: end 501: 502: if r = h[key] 503: r[:columns] << m.call(row[:column]) 504: r[:key] << m.call(row[:refcolumn]) 505: else 506: entry = h[key] = { 507: :name=>m.call(row[:name]), 508: :columns=>[m.call(row[:column])], 509: :key=>[m.call(row[:refcolumn])], 510: :on_update=>fklod_map[row[:on_update]], 511: :on_delete=>fklod_map[row[:on_delete]], 512: :deferrable=>row[:deferrable], 513: :table=>schema ? SQL::QualifiedIdentifier.new(m.call(row[:schema]), m.call(row[:table])) : m.call(row[:table]), 514: } 515: 516: unless schema 517: # If not combining schema information into the :table entry 518: # include it as a separate entry. 519: entry[:schema] = m.call(row[:schema]) 520: end 521: end 522: end 523: 524: h.values 525: end
# File lib/sequel/adapters/shared/postgres.rb, line 527 527: def freeze 528: server_version 529: supports_prepared_transactions? 530: @conversion_procs.freeze 531: super 532: end
Use the pg_* system tables to determine indexes on a table
# File lib/sequel/adapters/shared/postgres.rb, line 535 535: def indexes(table, opts=OPTS) 536: m = output_identifier_meth 537: oid = regclass_oid(table, opts) 538: 539: if server_version >= 90500 540: order = [Sequel[:indc][:relname], Sequel.function(:array_position, Sequel[:ind][:indkey], Sequel[:att][:attnum])] 541: else 542: range = 0...32 543: order = [Sequel[:indc][:relname], SQL::CaseExpression.new(range.map{|x| [SQL::Subscript.new(Sequel[:ind][:indkey], [x]), x]}, 32, Sequel[:att][:attnum])] 544: end 545: 546: attnums = SQL::Function.new(:ANY, Sequel[:ind][:indkey]) 547: 548: ds = metadata_dataset. 549: from{pg_class.as(:tab)}. 550: join(Sequel[:pg_index].as(:ind), :indrelid=>:oid). 551: join(Sequel[:pg_class].as(:indc), :oid=>:indexrelid). 552: join(Sequel[:pg_attribute].as(:att), :attrelid=>Sequel[:tab][:oid], :attnum=>attnums). 553: left_join(Sequel[:pg_constraint].as(:con), :conname=>Sequel[:indc][:relname]). 554: where{{ 555: indc[:relkind]=>'i', 556: ind[:indisprimary]=>false, 557: :indexprs=>nil, 558: :indisvalid=>true, 559: tab[:oid]=>oid}}. 560: order(*order). 561: select{[indc[:relname].as(:name), ind[:indisunique].as(:unique), att[:attname].as(:column), con[:condeferrable].as(:deferrable)]} 562: 563: ds = ds.where(:indpred=>nil) unless opts[:include_partial] 564: ds = ds.where(:indisready=>true) if server_version >= 80300 565: ds = ds.where(:indislive=>true) if server_version >= 90300 566: 567: indexes = {} 568: ds.each do |r| 569: i = indexes[m.call(r[:name])] ||= {:columns=>[], :unique=>r[:unique], :deferrable=>r[:deferrable]} 570: i[:columns] << m.call(r[:column]) 571: end 572: indexes 573: 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. |
# File lib/sequel/adapters/shared/postgres.rb, line 586 586: def notify(channel, opts=OPTS) 587: sql = String.new 588: sql << "NOTIFY " 589: dataset.send(:identifier_append, sql, channel) 590: if payload = opts[:payload] 591: sql << ", " 592: dataset.literal_append(sql, payload.to_s) 593: end 594: execute_ddl(sql, opts) 595: end
Return primary key for the given table.
# File lib/sequel/adapters/shared/postgres.rb, line 598 598: def primary_key(table, opts=OPTS) 599: quoted_table = quote_schema_table(table) 600: Sequel.synchronize{return @primary_keys[quoted_table] if @primary_keys.has_key?(quoted_table)} 601: sql = "#{SELECT_PK_SQL} AND pg_class.oid = #{literal(regclass_oid(table, opts))}" 602: value = fetch(sql).single_value 603: Sequel.synchronize{@primary_keys[quoted_table] = value} 604: end
Return the sequence providing the default for the primary key for the given table.
# File lib/sequel/adapters/shared/postgres.rb, line 607 607: def primary_key_sequence(table, opts=OPTS) 608: quoted_table = quote_schema_table(table) 609: Sequel.synchronize{return @primary_key_sequences[quoted_table] if @primary_key_sequences.has_key?(quoted_table)} 610: sql = "#{SELECT_SERIAL_SEQUENCE_SQL} AND t.oid = #{literal(regclass_oid(table, opts))}" 611: if pks = fetch(sql).single_record 612: value = literal(SQL::QualifiedIdentifier.new(pks[:schema], pks[:sequence])) 613: Sequel.synchronize{@primary_key_sequences[quoted_table] = value} 614: else 615: sql = "#{SELECT_CUSTOM_SEQUENCE_SQL} AND t.oid = #{literal(regclass_oid(table, opts))}" 616: if pks = fetch(sql).single_record 617: value = literal(SQL::QualifiedIdentifier.new(pks[:schema], LiteralString.new(pks[:sequence]))) 618: Sequel.synchronize{@primary_key_sequences[quoted_table] = value} 619: end 620: end 621: 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
# File lib/sequel/adapters/shared/postgres.rb, line 629 629: def refresh_view(name, opts=OPTS) 630: run "REFRESH MATERIALIZED VIEW#{' CONCURRENTLY' if opts[:concurrently]} #{quote_schema_table(name)}" 631: end
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, line 635 635: def reset_primary_key_sequence(table) 636: return unless seq = primary_key_sequence(table) 637: pk = SQL::Identifier.new(primary_key(table)) 638: db = self 639: s, t = schema_and_table(table) 640: table = Sequel.qualify(s, t) if s 641: 642: if server_version >= 100000 643: seq_ds = metadata_dataset.from(:pg_sequence).where(:seqrelid=>regclass_oid(LiteralString.new(seq))) 644: increment_by = :seqincrement 645: min_value = :seqmin 646: else 647: seq_ds = metadata_dataset.from(LiteralString.new(seq)) 648: increment_by = :increment_by 649: min_value = :min_value 650: end 651: 652: get{setval(seq, db[table].select(coalesce(max(pk)+seq_ds.select(increment_by), seq_ds.select(min_value))), false)} 653: end
# File lib/sequel/adapters/shared/postgres.rb, line 655 655: def rollback_prepared_transaction(transaction_id, opts=OPTS) 656: run("ROLLBACK PREPARED #{literal(transaction_id)}", opts) 657: end
PostgreSQL uses SERIAL psuedo-type instead of AUTOINCREMENT for managing incrementing primary keys.
# File lib/sequel/adapters/shared/postgres.rb, line 661 661: def serial_primary_key_options 662: auto_increment_key = server_version >= 100002 ? :identity : :serial 663: {:primary_key => true, auto_increment_key => true, :type=>Integer} 664: end
The version of the PostgreSQL server, used for determining capability.
# File lib/sequel/adapters/shared/postgres.rb, line 667 667: def server_version(server=nil) 668: return @server_version if @server_version 669: ds = dataset 670: ds = ds.server(server) if server 671: @server_version ||= ds.with_sql("SELECT CAST(current_setting('server_version_num') AS integer) AS v").single_value rescue 0 672: end
PostgreSQL supports CREATE TABLE IF NOT EXISTS on 9.1+
# File lib/sequel/adapters/shared/postgres.rb, line 675 675: def supports_create_table_if_not_exists? 676: server_version >= 90100 677: end
PostgreSQL 9.0+ supports some types of deferrable constraints beyond foreign key constraints.
# File lib/sequel/adapters/shared/postgres.rb, line 680 680: def supports_deferrable_constraints? 681: server_version >= 90000 682: end
PostgreSQL supports deferrable foreign key constraints.
# File lib/sequel/adapters/shared/postgres.rb, line 685 685: def supports_deferrable_foreign_key_constraints? 686: true 687: end
PostgreSQL supports DROP TABLE IF EXISTS
# File lib/sequel/adapters/shared/postgres.rb, line 690 690: def supports_drop_table_if_exists? 691: true 692: end
PostgreSQL supports prepared transactions (two-phase commit) if max_prepared_transactions is greater than 0.
# File lib/sequel/adapters/shared/postgres.rb, line 706 706: def supports_prepared_transactions? 707: return @supports_prepared_transactions if defined?(@supports_prepared_transactions) 708: @supports_prepared_transactions = self['SHOW max_prepared_transactions'].get.to_i > 0 709: end
PostgreSQL supports savepoints
# File lib/sequel/adapters/shared/postgres.rb, line 712 712: def supports_savepoints? 713: true 714: end
PostgreSQL supports transaction isolation levels
# File lib/sequel/adapters/shared/postgres.rb, line 717 717: def supports_transaction_isolation_levels? 718: true 719: end
PostgreSQL supports transaction DDL statements.
# File lib/sequel/adapters/shared/postgres.rb, line 722 722: def supports_transactional_ddl? 723: true 724: end
PostgreSQL 9.0+ supports trigger conditions.
# File lib/sequel/adapters/shared/postgres.rb, line 700 700: def supports_trigger_conditions? 701: server_version >= 90000 702: 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 |
# File lib/sequel/adapters/shared/postgres.rb, line 735 735: def tables(opts=OPTS, &block) 736: pg_class_relname('r', opts, &block) 737: end
Check whether the given type name string/symbol (e.g. :hstore) is supported by the database.
# File lib/sequel/adapters/shared/postgres.rb, line 741 741: def type_supported?(type) 742: Sequel.synchronize{return @supported_types[type] if @supported_types.has_key?(type)} 743: supported = from(:pg_type).where(:typtype=>'b', :typname=>type.to_s).count > 0 744: Sequel.synchronize{return @supported_types[type] = supported} 745: 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
# File lib/sequel/adapters/shared/postgres.rb, line 754 754: def values(v) 755: @default_dataset.clone(:values=>v) 756: end
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, line 766 766: def views(opts=OPTS) 767: relkind = opts[:materialized] ? 'm' : 'v' 768: pg_class_relname(relkind, opts) 769: end