Module | Sequel::MySQL::DatasetMethods |
In: |
lib/sequel/adapters/shared/mysql.rb
|
MATCH_AGAINST | = | ["MATCH ".freeze, " AGAINST (".freeze, ")".freeze].freeze |
MATCH_AGAINST_BOOLEAN | = | ["MATCH ".freeze, " AGAINST (".freeze, " IN BOOLEAN MODE)".freeze].freeze |
Sets up the select methods to use SQL_CALC_FOUND_ROWS option.
dataset.calc_found_rows.limit(10) # SELECT SQL_CALC_FOUND_ROWS * FROM table LIMIT 10
# File lib/sequel/adapters/shared/mysql.rb, line 666 666: def calc_found_rows 667: clone(:calc_found_rows => true) 668: end
# File lib/sequel/adapters/shared/mysql.rb, line 600 600: def complex_expression_sql_append(sql, op, args) 601: case op 602: when :IN, "NOT IN""NOT IN" 603: ds = args[1] 604: if ds.is_a?(Sequel::Dataset) && ds.opts[:limit] 605: super(sql, op, [args[0], ds.from_self]) 606: else 607: super 608: end 609: when :~, '!~''!~', '~*''~*', '!~*''!~*', :LIKE, 'NOT LIKE''NOT LIKE', :ILIKE, 'NOT ILIKE''NOT ILIKE' 610: if !db.mariadb? && db.server_version >= 80000 && [:~, '!~''!~'].include?(op) 611: func = Sequel.function(:REGEXP_LIKE, args[0], args[1], 'c') 612: func = ~func if op == '!~''!~' 613: return literal_append(sql, func) 614: end 615: 616: sql << '(' 617: literal_append(sql, args[0]) 618: sql << ' ' 619: sql << 'NOT ' if ['NOT LIKE''NOT LIKE', 'NOT ILIKE''NOT ILIKE', '!~''!~', '!~*''!~*'].include?(op) 620: sql << ([:~, '!~''!~', '~*''~*', '!~*''!~*'].include?(op) ? 'REGEXP' : 'LIKE') 621: sql << ' ' 622: sql << 'BINARY ' if [:~, '!~''!~', :LIKE, 'NOT LIKE''NOT LIKE'].include?(op) 623: literal_append(sql, args[1]) 624: if [:LIKE, 'NOT LIKE''NOT LIKE', :ILIKE, 'NOT ILIKE''NOT ILIKE'].include?(op) 625: sql << " ESCAPE " 626: literal_append(sql, "\\") 627: end 628: sql << ')' 629: when '||''||' 630: if args.length > 1 631: sql << "CONCAT" 632: array_sql_append(sql, args) 633: else 634: literal_append(sql, args[0]) 635: end 636: when 'B~''B~' 637: sql << "CAST(~" 638: literal_append(sql, args[0]) 639: sql << " AS SIGNED INTEGER)" 640: else 641: super 642: end 643: end
MySQL‘s CURRENT_TIMESTAMP does not use fractional seconds, even if the database itself supports fractional seconds. If MySQL 5.6.4+ is being used, use a value that will return fractional seconds.
# File lib/sequel/adapters/shared/mysql.rb, line 649 649: def constant_sql_append(sql, constant) 650: if constant == :CURRENT_TIMESTAMP && supports_timestamp_usecs? 651: sql << 'CURRENT_TIMESTAMP(6)' 652: else 653: super 654: end 655: end
Sets up the select methods to delete from if deleting from a joined dataset:
DB[:a].join(:b, a_id: :id).delete # DELETE a FROM a INNER JOIN b ON (b.a_id = a.id) DB[:a].join(:b, a_id: :id).delete_from(:a, :b).delete # DELETE a, b FROM a INNER JOIN b ON (b.a_id = a.id)
# File lib/sequel/adapters/shared/mysql.rb, line 678 678: def delete_from(*tables) 679: clone(:delete_from=>tables) 680: end
Use GROUP BY instead of DISTINCT ON if arguments are provided.
# File lib/sequel/adapters/shared/mysql.rb, line 658 658: def distinct(*args) 659: args.empty? ? super : group(*args) 660: end
Return the results of an EXPLAIN query as a string. Options:
:extended : | Use EXPLAIN EXPTENDED instead of EXPLAIN if true. |
# File lib/sequel/adapters/shared/mysql.rb, line 684 684: def explain(opts=OPTS) 685: # Load the PrettyTable class, needed for explain output 686: Sequel.extension(:_pretty_table) unless defined?(Sequel::PrettyTable) 687: 688: ds = db.send(:metadata_dataset).with_sql(((opts[:extended] && (db.mariadb? || db.server_version < 50700)) ? 'EXPLAIN EXTENDED ' : 'EXPLAIN ') + select_sql).naked 689: rows = ds.all 690: Sequel::PrettyTable.string(rows, ds.columns) 691: end
Return a cloned dataset which will use LOCK IN SHARE MODE to lock returned rows.
# File lib/sequel/adapters/shared/mysql.rb, line 694 694: def for_share 695: lock_style(:share) 696: end
Adds full text filter
# File lib/sequel/adapters/shared/mysql.rb, line 699 699: def full_text_search(cols, terms, opts = OPTS) 700: where(full_text_sql(cols, terms, opts)) 701: end
MySQL specific full text search syntax.
# File lib/sequel/adapters/shared/mysql.rb, line 704 704: def full_text_sql(cols, terms, opts = OPTS) 705: terms = terms.join(' ') if terms.is_a?(Array) 706: SQL::PlaceholderLiteralString.new((opts[:boolean] ? MATCH_AGAINST_BOOLEAN : MATCH_AGAINST), [Array(cols), terms]) 707: end
Sets up the insert methods to use INSERT IGNORE. Useful if you have a unique key and want to just skip inserting rows that violate the unique key restriction.
dataset.insert_ignore.multi_insert( [{name: 'a', value: 1}, {name: 'b', value: 2}] ) # INSERT IGNORE INTO tablename (name, value) VALUES (a, 1), (b, 2)
# File lib/sequel/adapters/shared/mysql.rb, line 726 726: def insert_ignore 727: clone(:insert_ignore=>true) 728: end
Transforms :straight to STRAIGHT_JOIN.
# File lib/sequel/adapters/shared/mysql.rb, line 710 710: def join_type_sql(join_type) 711: if join_type == :straight 712: 'STRAIGHT_JOIN' 713: else 714: super 715: end 716: end
Sets up the insert methods to use ON DUPLICATE KEY UPDATE If you pass no arguments, ALL fields will be updated with the new values. If you pass the fields you want then ONLY those field will be updated. If you pass a hash you can customize the values (for example, to increment a numeric field).
Useful if you have a unique key and want to update inserting rows that violate the unique key restriction.
dataset.on_duplicate_key_update.multi_insert( [{name: 'a', value: 1}, {name: 'b', value: 2}] ) # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2) # ON DUPLICATE KEY UPDATE name=VALUES(name), value=VALUES(value) dataset.on_duplicate_key_update(:value).multi_insert( [{name: 'a', value: 1}, {name: 'b', value: 2}] ) # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2) # ON DUPLICATE KEY UPDATE value=VALUES(value) dataset.on_duplicate_key_update( value: Sequel.lit('value + VALUES(value)') ).multi_insert( [{name: 'a', value: 1}, {name: 'b', value: 2}] ) # INSERT INTO tablename (name, value) VALUES (a, 1), (b, 2) # ON DUPLICATE KEY UPDATE value=value + VALUES(value)
# File lib/sequel/adapters/shared/mysql.rb, line 759 759: def on_duplicate_key_update(*args) 760: clone(:on_duplicate_key_update => args) 761: end
MariaDB 10.2+ and MySQL 8+ support CTEs
# File lib/sequel/adapters/shared/mysql.rb, line 769 769: def supports_cte?(type=:select) 770: if db.mariadb? 771: type == :select && db.server_version >= 100200 772: else 773: case type 774: when :select, :update, :delete 775: db.server_version >= 80000 776: end 777: end 778: end
Check the database setting for whether fractional timestamps are suppported.
# File lib/sequel/adapters/shared/mysql.rb, line 834 834: def supports_timestamp_usecs? 835: db.supports_timestamp_usecs? 836: end
Sets up the update methods to use UPDATE IGNORE. Useful if you have a unique key and want to just skip updating rows that violate the unique key restriction.
dataset.update_ignore.update(name: 'a', value: 1) # UPDATE IGNORE tablename SET name = 'a', value = 1
# File lib/sequel/adapters/shared/mysql.rb, line 849 849: def update_ignore 850: clone(:update_ignore=>true) 851: end