module Sequel::MySQL::DatabaseMethods

Constants

CAST_TYPES
COLUMN_DEFINITION_ORDER
DATABASE_ERROR_REGEXPS

Attributes

default_charset[RW]

Set the default charset used for CREATE TABLE. You can pass the :charset option to create_table to override this setting.

default_collate[RW]

Set the default collation used for CREATE TABLE. You can pass the :collate option to create_table to override this setting.

default_engine[RW]

Set the default engine used for CREATE TABLE. You can pass the :engine option to create_table to override this setting.

Public Instance Methods

cast_type_literal(type) click to toggle source

MySQL's cast rules are restrictive in that you can't just cast to any possible database type.

Calls superclass method
   # File lib/sequel/adapters/shared/mysql.rb
38 def cast_type_literal(type)
39   CAST_TYPES[type] || super
40 end
commit_prepared_transaction(transaction_id, opts=OPTS) click to toggle source
   # File lib/sequel/adapters/shared/mysql.rb
42 def commit_prepared_transaction(transaction_id, opts=OPTS)
43   run("XA COMMIT #{literal(transaction_id)}", opts)
44 end
database_type() click to toggle source
   # File lib/sequel/adapters/shared/mysql.rb
46 def database_type
47   :mysql
48 end
foreign_key_list(table, opts=OPTS) click to toggle source

Use the Information Schema's KEY_COLUMN_USAGE table to get basic information on foreign key columns, but include the constraint name.

   # File lib/sequel/adapters/shared/mysql.rb
53 def foreign_key_list(table, opts=OPTS)
54   m = output_identifier_meth
55   im = input_identifier_meth
56   ds = metadata_dataset.
57     from(Sequel[:INFORMATION_SCHEMA][:KEY_COLUMN_USAGE]).
58     where(:TABLE_NAME=>im.call(table), :TABLE_SCHEMA=>Sequel.function(:DATABASE)).
59     exclude(:CONSTRAINT_NAME=>'PRIMARY').
60     exclude(:REFERENCED_TABLE_NAME=>nil).
61     order(:CONSTRAINT_NAME, :POSITION_IN_UNIQUE_CONSTRAINT).
62     select(Sequel[:CONSTRAINT_NAME].as(:name), Sequel[:COLUMN_NAME].as(:column), Sequel[:REFERENCED_TABLE_NAME].as(:table), Sequel[:REFERENCED_COLUMN_NAME].as(:key))
63   
64   h = {}
65   ds.each do |row|
66     if r = h[row[:name]]
67       r[:columns] << m.call(row[:column])
68       r[:key] << m.call(row[:key])
69     else
70       h[row[:name]] = {:name=>m.call(row[:name]), :columns=>[m.call(row[:column])], :table=>m.call(row[:table]), :key=>[m.call(row[:key])]}
71     end
72   end
73   h.values
74 end
freeze() click to toggle source
Calls superclass method
   # File lib/sequel/adapters/shared/mysql.rb
76 def freeze
77   server_version
78   mariadb?
79   supports_timestamp_usecs?
80   super
81 end
global_index_namespace?() click to toggle source

MySQL namespaces indexes per table.

   # File lib/sequel/adapters/shared/mysql.rb
84 def global_index_namespace?
85   false
86 end
indexes(table, opts=OPTS) click to toggle source

Use SHOW INDEX FROM to get the index information for the table.

By default partial indexes are not included, you can use the option :partial to override this.

    # File lib/sequel/adapters/shared/mysql.rb
 93 def indexes(table, opts=OPTS)
 94   indexes = {}
 95   remove_indexes = []
 96   m = output_identifier_meth
 97   schema, table = schema_and_table(table)
 98 
 99   table = Sequel::SQL::Identifier.new(table)
100   sql = "SHOW INDEX FROM #{literal(table)}"
101   if schema
102     schema = Sequel::SQL::Identifier.new(schema)
103     sql += " FROM #{literal(schema)}"
104   end
105 
106   metadata_dataset.with_sql(sql).each do |r|
107     name = r[:Key_name]
108     next if name == 'PRIMARY'
109     name = m.call(name)
110     remove_indexes << name if r[:Sub_part] && ! opts[:partial]
111     i = indexes[name] ||= {:columns=>[], :unique=>r[:Non_unique] != 1}
112     i[:columns] << m.call(r[:Column_name])
113   end
114   indexes.reject{|k,v| remove_indexes.include?(k)}
115 end
mariadb?() click to toggle source

Whether the database is MariaDB and not MySQL

    # File lib/sequel/adapters/shared/mysql.rb
122 def mariadb?
123   return @is_mariadb if defined?(@is_mariadb)
124   @is_mariadb = !(fetch('SELECT version()').single_value! !~ /mariadb/i)
125 end
rollback_prepared_transaction(transaction_id, opts=OPTS) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
117 def rollback_prepared_transaction(transaction_id, opts=OPTS)
118   run("XA ROLLBACK #{literal(transaction_id)}", opts)
119 end
server_version() click to toggle source

Get version of MySQL server, used for determined capabilities.

    # File lib/sequel/adapters/shared/mysql.rb
128 def server_version
129   @server_version ||= begin
130     m = /(\d+)\.(\d+)\.(\d+)/.match(fetch('SELECT version()').single_value!)
131     (m[1].to_i * 10000) + (m[2].to_i * 100) + m[3].to_i
132   end
133 end
supports_create_table_if_not_exists?() click to toggle source

MySQL supports CREATE TABLE IF NOT EXISTS syntax.

    # File lib/sequel/adapters/shared/mysql.rb
136 def supports_create_table_if_not_exists?
137   true
138 end
supports_generated_columns?() click to toggle source

Generated columns are supported in MariaDB 5.2.0+ and MySQL 5.7.6+.

    # File lib/sequel/adapters/shared/mysql.rb
141 def supports_generated_columns?
142   server_version >= (mariadb? ? 50200 : 50706)
143 end
supports_prepared_transactions?() click to toggle source

MySQL 5+ supports prepared transactions (two-phase commit) using XA

    # File lib/sequel/adapters/shared/mysql.rb
146 def supports_prepared_transactions?
147   server_version >= 50000
148 end
supports_savepoints?() click to toggle source

MySQL 5+ supports savepoints

    # File lib/sequel/adapters/shared/mysql.rb
151 def supports_savepoints?
152   server_version >= 50000
153 end
supports_savepoints_in_prepared_transactions?() click to toggle source

MySQL doesn't support savepoints inside prepared transactions in from 5.5.12 to 5.5.23, see bugs.mysql.com/bug.php?id=64374

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
157 def supports_savepoints_in_prepared_transactions?
158   super && (server_version <= 50512 || server_version >= 50523)
159 end
supports_timestamp_usecs?() click to toggle source

Support fractional timestamps on MySQL 5.6.5+ if the :fractional_seconds Database option is used. Technically, MySQL 5.6.4+ supports them, but automatic initialization of datetime values wasn't supported to 5.6.5+, and this is related to that.

    # File lib/sequel/adapters/shared/mysql.rb
165 def supports_timestamp_usecs?
166   return @supports_timestamp_usecs if defined?(@supports_timestamp_usecs)
167   @supports_timestamp_usecs = server_version >= 50605 && typecast_value_boolean(opts[:fractional_seconds])
168 end
supports_transaction_isolation_levels?() click to toggle source

MySQL supports transaction isolation levels

    # File lib/sequel/adapters/shared/mysql.rb
171 def supports_transaction_isolation_levels?
172   true
173 end
tables(opts=OPTS) click to toggle source

Return an array of symbols specifying table names in the current database.

Options:

:server

Set the server to use

    # File lib/sequel/adapters/shared/mysql.rb
179 def tables(opts=OPTS)
180   full_tables('BASE TABLE', opts)
181 end
views(opts=OPTS) click to toggle source

Return an array of symbols specifying view names in the current database.

Options:

:server

Set the server to use

    # File lib/sequel/adapters/shared/mysql.rb
187 def views(opts=OPTS)
188   full_tables('VIEW', opts)
189 end

Private Instance Methods

alter_table_add_column_sql(table, op) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
193 def alter_table_add_column_sql(table, op)
194   pos = if after_col = op[:after]
195     " AFTER #{quote_identifier(after_col)}"
196   elsif op[:first]
197     " FIRST"
198   end
199 
200   sql = if related = op.delete(:table)
201     sql = super + "#{pos}, ADD "
202     op[:table] = related
203     op[:key] ||= primary_key_from_schema(related)
204     if constraint_name = op.delete(:foreign_key_constraint_name)
205       sql << "CONSTRAINT #{quote_identifier(constraint_name)} "
206     end
207     sql << "FOREIGN KEY (#{quote_identifier(op[:name])})#{column_references_sql(op)}"
208   else
209     "#{super}#{pos}"
210   end
211 end
alter_table_add_constraint_sql(table, op) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
248 def alter_table_add_constraint_sql(table, op)
249   if op[:type] == :foreign_key
250     op[:key] ||= primary_key_from_schema(op[:table])
251   end
252   super
253 end
alter_table_change_column_sql(table, op) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
213 def alter_table_change_column_sql(table, op)
214   o = op[:op]
215   opts = schema(table).find{|x| x.first == op[:name]}
216   opts = opts ? opts.last.dup : {}
217   opts[:name] = o == :rename_column ? op[:new_name] : op[:name]
218   opts[:type] = o == :set_column_type ? op[:type] : opts[:db_type]
219   opts[:null] = o == :set_column_null ? op[:null] : opts[:allow_null]
220   opts[:default] = o == :set_column_default ? op[:default] : opts[:ruby_default]
221   opts.delete(:default) if opts[:default] == nil
222   opts.delete(:primary_key)
223   unless op[:type] || opts[:type]
224     raise Error, "cannot determine database type to use for CHANGE COLUMN operation"
225   end
226   opts = op.merge(opts)
227   if op.has_key?(:auto_increment)
228     opts[:auto_increment] = op[:auto_increment]
229   end
230   "CHANGE COLUMN #{quote_identifier(op[:name])} #{column_definition_sql(opts)}"
231 end
alter_table_drop_constraint_sql(table, op) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
255 def alter_table_drop_constraint_sql(table, op)
256   case op[:type]
257   when :primary_key
258     "DROP PRIMARY KEY"
259   when :foreign_key
260     name = op[:name] || foreign_key_name(table, op[:columns])
261     "DROP FOREIGN KEY #{quote_identifier(name)}"
262   when :unique
263     "DROP INDEX #{quote_identifier(op[:name])}"
264   when :check, nil 
265     if supports_check_constraints?
266       "DROP CONSTRAINT #{quote_identifier(op[:name])}"
267     end
268   end
269 end
alter_table_rename_column_sql(table, op)
alter_table_set_column_default_sql(table, op) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
236 def alter_table_set_column_default_sql(table, op)
237   return super unless op[:default].nil?
238 
239   opts = schema(table).find{|x| x[0] == op[:name]}
240 
241   if opts && opts[1][:allow_null] == false
242     "ALTER COLUMN #{quote_identifier(op[:name])} DROP DEFAULT"
243   else
244     super
245   end
246 end
alter_table_set_column_null_sql(table, op)
alter_table_set_column_type_sql(table, op)
alter_table_sql(table, op) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
271 def alter_table_sql(table, op)
272   case op[:op]
273   when :drop_index
274     "#{drop_index_sql(table, op)} ON #{quote_schema_table(table)}"
275   when :drop_constraint
276     if op[:type] == :primary_key
277       if (pk = primary_key_from_schema(table)).length == 1
278         return [alter_table_sql(table, {:op=>:rename_column, :name=>pk.first, :new_name=>pk.first, :auto_increment=>false}), super]
279       end
280     end
281     super
282   else
283     super
284   end
285 end
auto_increment_sql() click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
330 def auto_increment_sql
331   'AUTO_INCREMENT'
332 end
begin_new_transaction(conn, opts) click to toggle source

MySQL needs to set transaction isolation before begining a transaction

    # File lib/sequel/adapters/shared/mysql.rb
335 def begin_new_transaction(conn, opts)
336   set_transaction_isolation(conn, opts)
337   log_connection_execute(conn, begin_transaction_sql)
338 end
begin_transaction(conn, opts=OPTS) click to toggle source

Use XA START to start a new prepared transaction if the :prepare option is given.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
342 def begin_transaction(conn, opts=OPTS)
343   if (s = opts[:prepare]) && savepoint_level(conn) == 1
344     log_connection_execute(conn, "XA START #{literal(s)}")
345   else
346     super
347   end
348 end
column_definition_generated_sql(sql, column) click to toggle source

Add generation clause SQL fragment to column creation SQL.

    # File lib/sequel/adapters/shared/mysql.rb
351 def column_definition_generated_sql(sql, column)
352   if (generated_expression = column[:generated_always_as])
353     sql << " GENERATED ALWAYS AS (#{literal(generated_expression)})"
354     case (type = column[:generated_type])
355     when nil
356       # none, database default
357     when :virtual
358       sql << " VIRTUAL"
359     when :stored
360       sql << (mariadb? ? " PERSISTENT" : " STORED")
361     else
362       raise Error, "unsupported :generated_type option: #{type.inspect}"
363     end
364   end
365 end
column_definition_order() click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
367 def column_definition_order
368   COLUMN_DEFINITION_ORDER
369 end
column_definition_sql(column) click to toggle source

MySQL doesn't allow default values on text columns, so ignore if it the generic text type is used

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
373 def column_definition_sql(column)
374   column.delete(:default) if column[:type] == File || (column[:type] == String && column[:text] == true)
375   super
376 end
column_schema_normalize_default(default, type) click to toggle source

Handle MySQL specific default format.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
288 def column_schema_normalize_default(default, type)
289   if column_schema_default_string_type?(type)
290     return if [:date, :datetime, :time].include?(type) && /\ACURRENT_(?:DATE|TIMESTAMP)?\z/.match(default)
291     default = "'#{default.gsub("'", "''").gsub('\\', '\\\\')}'"
292   end
293   super(default, type)
294 end
column_schema_to_ruby_default(default, type) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
296 def column_schema_to_ruby_default(default, type)
297   return Sequel::CURRENT_DATE if mariadb? && server_version >= 100200 && default == 'curdate()'
298   super
299 end
combinable_alter_table_op?(op) click to toggle source

Don't allow combining adding foreign key operations with other operations, since in some cases adding a foreign key constraint in the same query as other operations results in MySQL error 150.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
304 def combinable_alter_table_op?(op)
305   super && !(op[:op] == :add_constraint && op[:type] == :foreign_key) && !(op[:op] == :drop_constraint && op[:type] == :primary_key)
306 end
commit_transaction(conn, opts=OPTS) click to toggle source

Prepare the XA transaction for a two-phase commit if the :prepare option is given.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
380 def commit_transaction(conn, opts=OPTS)
381   if (s = opts[:prepare]) && savepoint_level(conn) <= 1
382     log_connection_execute(conn, "XA END #{literal(s)}")
383     log_connection_execute(conn, "XA PREPARE #{literal(s)}")
384   else
385     super
386   end
387 end
create_table_sql(name, generator, options = OPTS) click to toggle source

Use MySQL specific syntax for engine type and character encoding

    # File lib/sequel/adapters/shared/mysql.rb
390 def create_table_sql(name, generator, options = OPTS)
391   engine = options.fetch(:engine, default_engine)
392   charset = options.fetch(:charset, default_charset)
393   collate = options.fetch(:collate, default_collate)
394   generator.constraints.sort_by{|c| (c[:type] == :primary_key) ? -1 : 1}
395 
396   # Proc for figuring out the primary key for a given table.
397   key_proc = lambda do |t|
398     if t == name 
399       if pk = generator.primary_key_name
400         [pk]
401       elsif !(pkc = generator.constraints.select{|con| con[:type] == :primary_key}).empty?
402         pkc.first[:columns]
403       elsif !(pkc = generator.columns.select{|con| con[:primary_key] == true}).empty?
404         pkc.map{|c| c[:name]}
405       end
406     else
407       primary_key_from_schema(t)
408     end
409   end
410 
411   # Manually set the keys, since MySQL requires one, it doesn't use the primary
412   # key if none are specified.
413   generator.constraints.each do |c|
414     if c[:type] == :foreign_key
415       c[:key] ||= key_proc.call(c[:table])
416     end
417   end
418 
419   # Split column constraints into table constraints in some cases:
420   # foreign key - Always
421   # unique, primary_key - Only if constraint has a name
422   generator.columns.each do |c|
423     if t = c.delete(:table)
424       same_table = t == name
425       key = c[:key] || key_proc.call(t)
426 
427       if same_table && !key.nil?
428         generator.constraints.unshift(:type=>:unique, :columns=>Array(key))
429       end
430 
431       generator.foreign_key([c[:name]], t, c.merge(:name=>c[:foreign_key_constraint_name], :type=>:foreign_key, :key=>key))
432     end
433   end
434 
435   "#{super}#{" ENGINE=#{engine}" if engine}#{" DEFAULT CHARSET=#{charset}" if charset}#{" DEFAULT COLLATE=#{collate}" if collate}"
436 end
database_error_regexps() click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
446 def database_error_regexps
447   DATABASE_ERROR_REGEXPS
448 end
full_tables(type, opts) click to toggle source

Backbone of the tables and views support using SHOW FULL TABLES.

    # File lib/sequel/adapters/shared/mysql.rb
451 def full_tables(type, opts)
452   m = output_identifier_meth
453   metadata_dataset.with_sql('SHOW FULL TABLES').server(opts[:server]).map{|r| m.call(r.values.first) if r.delete(:Table_type) == type}.compact
454 end
index_definition_sql(table_name, index) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
456 def index_definition_sql(table_name, index)
457   index_name = quote_identifier(index[:name] || default_index_name(table_name, index[:columns]))
458   raise Error, "Partial indexes are not supported for this database" if index[:where] && !supports_partial_indexes?
459   index_type = case index[:type]
460   when :full_text
461     "FULLTEXT "
462   when :spatial
463     "SPATIAL "
464   else
465     using = " USING #{index[:type]}" unless index[:type] == nil
466     "UNIQUE " if index[:unique]
467   end
468   "CREATE #{index_type}INDEX #{index_name}#{using} ON #{quote_schema_table(table_name)} #{literal(index[:columns])}"
469 end
mysql_connection_setting_sqls() click to toggle source

The SQL queries to execute on initial connection

    # File lib/sequel/adapters/shared/mysql.rb
309 def mysql_connection_setting_sqls
310   sqls = []
311   
312   if wait_timeout = opts.fetch(:timeout, 2147483)
313     # Increase timeout so mysql server doesn't disconnect us
314     # Value used by default is maximum allowed value on Windows.
315     sqls << "SET @@wait_timeout = #{wait_timeout}"
316   end
317 
318   # By default, MySQL 'where id is null' selects the last inserted id
319   sqls <<  "SET SQL_AUTO_IS_NULL=0" unless opts[:auto_is_null]
320 
321   # If the user has specified one or more sql modes, enable them
322   if sql_mode = opts[:sql_mode]
323     sql_mode = Array(sql_mode).join(',').upcase
324     sqls <<  "SET sql_mode = '#{sql_mode}'"
325   end
326 
327   sqls
328 end
primary_key_from_schema(table) click to toggle source

Parse the schema for the given table to get an array of primary key columns

    # File lib/sequel/adapters/shared/mysql.rb
472 def primary_key_from_schema(table)
473   schema(table).select{|a| a[1][:primary_key]}.map{|a| a[0]}
474 end
rollback_transaction(conn, opts=OPTS) click to toggle source

Rollback the currently open XA transaction

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
477 def rollback_transaction(conn, opts=OPTS)
478   if (s = opts[:prepare]) && savepoint_level(conn) <= 1
479     log_connection_execute(conn, "XA END #{literal(s)}")
480     log_connection_execute(conn, "XA PREPARE #{literal(s)}")
481     log_connection_execute(conn, "XA ROLLBACK #{literal(s)}")
482   else
483     super
484   end
485 end
schema_column_type(db_type) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
487 def schema_column_type(db_type)
488   case db_type
489   when /\Aset/io
490     :set
491   when /\Amediumint/io
492     :integer
493   when /\Amediumtext/io
494     :string
495   else
496     super
497   end
498 end
schema_parse_table(table_name, opts) click to toggle source

Use the MySQL specific DESCRIBE syntax to get a table description.

    # File lib/sequel/adapters/shared/mysql.rb
501 def schema_parse_table(table_name, opts)
502   m = output_identifier_meth(opts[:dataset])
503   im = input_identifier_meth(opts[:dataset])
504   table = SQL::Identifier.new(im.call(table_name))
505   table = SQL::QualifiedIdentifier.new(im.call(opts[:schema]), table) if opts[:schema]
506   metadata_dataset.with_sql("DESCRIBE ?", table).map do |row|
507     extra = row.delete(:Extra)
508     if row[:primary_key] = row.delete(:Key) == 'PRI'
509       row[:auto_increment] = !!(extra.to_s =~ /auto_increment/i)
510     end
511     if supports_generated_columns?
512       # Extra field contains VIRTUAL or PERSISTENT for generated columns
513       row[:generated] = !!(extra.to_s =~ /VIRTUAL|STORED|PERSISTENT/i)
514     end
515     row[:allow_null] = row.delete(:Null) == 'YES'
516     row[:default] = row.delete(:Default)
517     row[:db_type] = row.delete(:Type)
518     row[:type] = schema_column_type(row[:db_type])
519     [m.call(row.delete(:Field)), row]
520   end
521 end
split_alter_table_op?(op) click to toggle source

Split DROP INDEX ops on MySQL 5.6+, as dropping them in the same statement as dropping a related foreign key causes an error.

    # File lib/sequel/adapters/shared/mysql.rb
525 def split_alter_table_op?(op)
526   server_version >= 50600 && (op[:op] == :drop_index || (op[:op] == :drop_constraint && op[:type] == :unique))
527 end
supports_check_constraints?() click to toggle source

Whether the database supports CHECK constraints

    # File lib/sequel/adapters/shared/mysql.rb
530 def supports_check_constraints?
531   mariadb? && server_version >= 100200
532 end
supports_combining_alter_table_ops?() click to toggle source

MySQL can combine multiple alter table ops into a single query.

    # File lib/sequel/adapters/shared/mysql.rb
535 def supports_combining_alter_table_ops?
536   true
537 end
supports_create_or_replace_view?() click to toggle source

MySQL supports CREATE OR REPLACE VIEW.

    # File lib/sequel/adapters/shared/mysql.rb
540 def supports_create_or_replace_view?
541   true
542 end
supports_named_column_constraints?() click to toggle source

MySQL does not support named column constraints.

    # File lib/sequel/adapters/shared/mysql.rb
545 def supports_named_column_constraints?
546   false
547 end
type_literal_generic_datetime(column) click to toggle source

MySQL has both datetime and timestamp classes, most people are going to want datetime

    # File lib/sequel/adapters/shared/mysql.rb
567 def type_literal_generic_datetime(column)
568   if supports_timestamp_usecs?
569     :'datetime(6)'
570   elsif column[:default] == Sequel::CURRENT_TIMESTAMP
571     :timestamp
572   else
573     :datetime
574   end
575 end
type_literal_generic_file(column) click to toggle source

Respect the :size option if given to produce tinyblob, mediumblob, and longblob if :tiny, :medium, or :long is given.

    # File lib/sequel/adapters/shared/mysql.rb
552 def type_literal_generic_file(column)
553   case column[:size]
554   when :tiny    # < 2^8 bytes
555     :tinyblob
556   when :medium  # < 2^24 bytes
557     :mediumblob
558   when :long    # < 2^32 bytes
559     :longblob
560   else          # 2^16 bytes
561     :blob
562   end
563 end
type_literal_generic_only_time(column) click to toggle source

MySQL has both datetime and timestamp classes, most people are going to want datetime.

    # File lib/sequel/adapters/shared/mysql.rb
579 def type_literal_generic_only_time(column)
580   if supports_timestamp_usecs?
581     :'time(6)'
582   else
583     :time
584   end
585 end
type_literal_generic_trueclass(column) click to toggle source

MySQL doesn't have a true boolean class, so it uses tinyint(1)

    # File lib/sequel/adapters/shared/mysql.rb
588 def type_literal_generic_trueclass(column)
589   :'tinyint(1)'
590 end
view_with_check_option_support() click to toggle source

MySQL 5.0.2+ supports views with check option.

    # File lib/sequel/adapters/shared/mysql.rb
593 def view_with_check_option_support
594   :local if server_version >= 50002
595 end