Module | Sequel::MySQL::DatasetMethods |
In: |
lib/sequel/adapters/shared/mysql.rb
|
BOOL_TRUE | = | '1'.freeze |
BOOL_FALSE | = | '0'.freeze |
TIMESTAMP_FORMAT | = | "'%Y-%m-%d %H:%M:%S'".freeze |
COMMA_SEPARATOR | = | ', '.freeze |
MySQL specific syntax for LIKE/REGEXP searches, as well as string concatenation.
# File lib/sequel/adapters/shared/mysql.rb, line 197 197: def complex_expression_sql(op, args) 198: case op 199: when :~, '!~''!~', '~*''~*', '!~*''!~*', :LIKE, 'NOT LIKE''NOT LIKE', :ILIKE, 'NOT ILIKE''NOT ILIKE' 200: "(#{literal(args.at(0))} #{'NOT ' if [:'NOT LIKE', :'NOT ILIKE', :'!~', :'!~*'].include?(op)}#{[:~, :'!~', :'~*', :'!~*'].include?(op) ? 'REGEXP' : 'LIKE'} #{'BINARY ' if [:~, :'!~', :LIKE, :'NOT LIKE'].include?(op)}#{literal(args.at(1))})" 201: when '||''||' 202: if args.length > 1 203: "CONCAT(#{args.collect{|a| literal(a)}.join(', ')})" 204: else 205: literal(args.at(0)) 206: end 207: else 208: super(op, args) 209: end 210: end
MySQL supports ORDER and LIMIT clauses in DELETE statements.
# File lib/sequel/adapters/shared/mysql.rb, line 213 213: def delete_sql 214: sql = super 215: sql << " ORDER BY #{expression_list(opts[:order])}" if opts[:order] 216: sql << " LIMIT #{opts[:limit]}" if opts[:limit] 217: sql 218: end
Adds full text filter
# File lib/sequel/adapters/shared/mysql.rb, line 227 227: def full_text_search(cols, terms, opts = {}) 228: filter(full_text_sql(cols, terms, opts)) 229: end
Sets up multi_insert or import to use INSERT IGNORE. Useful if you have a unique key and want to just skip inserting rows that violate the unique key restriction.
Example:
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 276 276: def insert_ignore 277: clone(:insert_ignore=>true) 278: end
Transforms an CROSS JOIN to an INNER JOIN if the expr is not nil. Raises an error on use of :full_outer type, since MySQL doesn‘t support it.
# File lib/sequel/adapters/shared/mysql.rb, line 248 248: def join_table(type, table, expr=nil, table_alias={}) 249: type = :inner if (type == :cross) && !expr.nil? 250: raise(Sequel::Error, "MySQL doesn't support FULL OUTER JOIN") if type == :full_outer 251: super(type, table, expr, table_alias) 252: end
Transforms :natural_inner to NATURAL LEFT JOIN and straight to STRAIGHT_JOIN.
# File lib/sequel/adapters/shared/mysql.rb, line 256 256: def join_type_sql(join_type) 257: case join_type 258: when :straight then 'STRAIGHT_JOIN' 259: when :natural_inner then 'NATURAL LEFT JOIN' 260: else super 261: end 262: end
MySQL specific syntax for inserting multiple values at once.
# File lib/sequel/adapters/shared/mysql.rb, line 309 309: def multi_insert_sql(columns, values) 310: if update_cols = opts[:on_duplicate_key_update] 311: update_cols = columns if update_cols.empty? 312: update_string = update_cols.map{|c| "#{quote_identifier(c)}=VALUES(#{quote_identifier(c)})"}.join(COMMA_SEPARATOR) 313: end 314: values = values.map {|r| literal(Array(r))}.join(COMMA_SEPARATOR) 315: ["INSERT#{' IGNORE' if opts[:insert_ignore]} INTO #{source_list(@opts[:from])} (#{identifier_list(columns)}) VALUES #{values}#{" ON DUPLICATE KEY UPDATE #{update_string}" if update_string}"] 316: end
Sets up multi_insert or import 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.
Useful if you have a unique key and want to update inserting rows that violate the unique key restriction.
Examples:
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)
# File lib/sequel/adapters/shared/mysql.rb, line 304 304: def on_duplicate_key_update(*args) 305: clone(:on_duplicate_key_update => args) 306: end
MySQL specific syntax for REPLACE (aka UPSERT, or update if exists, insert if it doesn‘t).
# File lib/sequel/adapters/shared/mysql.rb, line 325 325: def replace_sql(*values) 326: from = source_list(@opts[:from]) 327: if values.empty? 328: "REPLACE INTO #{from} DEFAULT VALUES" 329: else 330: values = values[0] if values.size == 1 331: 332: case values 333: when Array 334: if values.empty? 335: "REPLACE INTO #{from} DEFAULT VALUES" 336: else 337: "REPLACE INTO #{from} VALUES #{literal(values)}" 338: end 339: when Hash 340: if values.empty? 341: "REPLACE INTO #{from} DEFAULT VALUES" 342: else 343: fl, vl = [], [] 344: values.each {|k, v| fl << literal(k.is_a?(String) ? k.to_sym : k); vl << literal(v)} 345: "REPLACE INTO #{from} (#{fl.join(COMMA_SEPARATOR)}) VALUES (#{vl.join(COMMA_SEPARATOR)})" 346: end 347: when Dataset 348: "REPLACE INTO #{from} #{literal(values)}" 349: else 350: if values.respond_to?(:values) 351: replace_sql(values.values) 352: else 353: "REPLACE INTO #{from} VALUES (#{literal(values)})" 354: end 355: end 356: end 357: end
MySQL supports ORDER and LIMIT clauses in UPDATE statements.
# File lib/sequel/adapters/shared/mysql.rb, line 360 360: def update_sql(values) 361: sql = super 362: sql << " ORDER BY #{expression_list(opts[:order])}" if opts[:order] 363: sql << " LIMIT #{opts[:limit]}" if opts[:limit] 364: sql 365: end