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 614 614: def calc_found_rows 615: clone(:calc_found_rows => true) 616: end
# File lib/sequel/adapters/shared/mysql.rb, line 554 554: def complex_expression_sql_append(sql, op, args) 555: case op 556: when :IN, "NOT IN""NOT IN" 557: ds = args[1] 558: if ds.is_a?(Sequel::Dataset) && ds.opts[:limit] 559: super(sql, op, [args[0], ds.from_self]) 560: else 561: super 562: end 563: when :~, '!~''!~', '~*''~*', '!~*''!~*', :LIKE, 'NOT LIKE''NOT LIKE', :ILIKE, 'NOT ILIKE''NOT ILIKE' 564: sql << '(' 565: literal_append(sql, args[0]) 566: sql << ' ' 567: sql << 'NOT ' if ['NOT LIKE''NOT LIKE', 'NOT ILIKE''NOT ILIKE', '!~''!~', '!~*''!~*'].include?(op) 568: sql << ([:~, '!~''!~', '~*''~*', '!~*''!~*'].include?(op) ? 'REGEXP' : 'LIKE') 569: sql << ' ' 570: sql << 'BINARY ' if [:~, '!~''!~', :LIKE, 'NOT LIKE''NOT LIKE'].include?(op) 571: literal_append(sql, args[1]) 572: if [:LIKE, 'NOT LIKE''NOT LIKE', :ILIKE, 'NOT ILIKE''NOT ILIKE'].include?(op) 573: sql << " ESCAPE " 574: literal_append(sql, "\\") 575: end 576: sql << ')' 577: when '||''||' 578: if args.length > 1 579: sql << "CONCAT" 580: array_sql_append(sql, args) 581: else 582: literal_append(sql, args[0]) 583: end 584: when 'B~''B~' 585: sql << "CAST(~" 586: literal_append(sql, args[0]) 587: sql << " AS SIGNED INTEGER)" 588: else 589: super 590: end 591: 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 597 597: def constant_sql_append(sql, constant) 598: if constant == :CURRENT_TIMESTAMP && supports_timestamp_usecs? 599: sql << 'CURRENT_TIMESTAMP(6)' 600: else 601: super 602: end 603: 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 626 626: def delete_from(*tables) 627: clone(:delete_from=>tables) 628: end
Use GROUP BY instead of DISTINCT ON if arguments are provided.
# File lib/sequel/adapters/shared/mysql.rb, line 606 606: def distinct(*args) 607: args.empty? ? super : group(*args) 608: 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 632 632: def explain(opts=OPTS) 633: # Load the PrettyTable class, needed for explain output 634: Sequel.extension(:_pretty_table) unless defined?(Sequel::PrettyTable) 635: 636: ds = db.send(:metadata_dataset).with_sql((opts[:extended] ? 'EXPLAIN EXTENDED ' : 'EXPLAIN ') + select_sql).naked 637: rows = ds.all 638: Sequel::PrettyTable.string(rows, ds.columns) 639: end
Return a cloned dataset which will use LOCK IN SHARE MODE to lock returned rows.
# File lib/sequel/adapters/shared/mysql.rb, line 642 642: def for_share 643: lock_style(:share) 644: end
Adds full text filter
# File lib/sequel/adapters/shared/mysql.rb, line 647 647: def full_text_search(cols, terms, opts = OPTS) 648: where(full_text_sql(cols, terms, opts)) 649: end
MySQL specific full text search syntax.
# File lib/sequel/adapters/shared/mysql.rb, line 652 652: def full_text_sql(cols, terms, opts = OPTS) 653: terms = terms.join(' ') if terms.is_a?(Array) 654: SQL::PlaceholderLiteralString.new((opts[:boolean] ? MATCH_AGAINST_BOOLEAN : MATCH_AGAINST), [Array(cols), terms]) 655: 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 674 674: def insert_ignore 675: clone(:insert_ignore=>true) 676: end
Transforms :straight to STRAIGHT_JOIN.
# File lib/sequel/adapters/shared/mysql.rb, line 658 658: def join_type_sql(join_type) 659: if join_type == :straight 660: 'STRAIGHT_JOIN' 661: else 662: super 663: end 664: 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 707 707: def on_duplicate_key_update(*args) 708: clone(:on_duplicate_key_update => args) 709: end
Check the database setting for whether fractional timestamps are suppported.
# File lib/sequel/adapters/shared/mysql.rb, line 760 760: def supports_timestamp_usecs? 761: db.supports_timestamp_usecs? 762: 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 770 770: def update_ignore 771: clone(:update_ignore=>true) 772: end