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
rename_tables(*renames) click to toggle source

Renames multiple tables in a single call.

DB.rename_tables [:items, :old_items], [:other_items, :old_other_items]
# RENAME TABLE items TO old_items, other_items TO old_other_items
    # File lib/sequel/adapters/shared/mysql.rb
195 def rename_tables(*renames)
196   execute_ddl(rename_tables_sql(renames))
197   renames.each{|from,| remove_cached_schema(from)}
198 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
202 def alter_table_add_column_sql(table, op)
203   pos = if after_col = op[:after]
204     " AFTER #{quote_identifier(after_col)}"
205   elsif op[:first]
206     " FIRST"
207   end
208 
209   sql = if related = op.delete(:table)
210     sql = super + "#{pos}, ADD "
211     op[:table] = related
212     op[:key] ||= primary_key_from_schema(related)
213     if constraint_name = op.delete(:foreign_key_constraint_name)
214       sql << "CONSTRAINT #{quote_identifier(constraint_name)} "
215     end
216     sql << "FOREIGN KEY (#{quote_identifier(op[:name])})#{column_references_sql(op)}"
217   else
218     "#{super}#{pos}"
219   end
220 end
alter_table_add_constraint_sql(table, op) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
257 def alter_table_add_constraint_sql(table, op)
258   if op[:type] == :foreign_key
259     op[:key] ||= primary_key_from_schema(op[:table])
260   end
261   super
262 end
alter_table_change_column_sql(table, op) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
222 def alter_table_change_column_sql(table, op)
223   o = op[:op]
224   opts = schema(table).find{|x| x.first == op[:name]}
225   opts = opts ? opts.last.dup : {}
226   opts[:name] = o == :rename_column ? op[:new_name] : op[:name]
227   opts[:type] = o == :set_column_type ? op[:type] : opts[:db_type]
228   opts[:null] = o == :set_column_null ? op[:null] : opts[:allow_null]
229   opts[:default] = o == :set_column_default ? op[:default] : opts[:ruby_default]
230   opts.delete(:default) if opts[:default] == nil
231   opts.delete(:primary_key)
232   unless op[:type] || opts[:type]
233     raise Error, "cannot determine database type to use for CHANGE COLUMN operation"
234   end
235   opts = op.merge(opts)
236   if op.has_key?(:auto_increment)
237     opts[:auto_increment] = op[:auto_increment]
238   end
239   "CHANGE COLUMN #{quote_identifier(op[:name])} #{column_definition_sql(opts)}"
240 end
alter_table_drop_constraint_sql(table, op) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
264 def alter_table_drop_constraint_sql(table, op)
265   case op[:type]
266   when :primary_key
267     "DROP PRIMARY KEY"
268   when :foreign_key
269     name = op[:name] || foreign_key_name(table, op[:columns])
270     "DROP FOREIGN KEY #{quote_identifier(name)}"
271   when :unique
272     "DROP INDEX #{quote_identifier(op[:name])}"
273   when :check, nil 
274     if supports_check_constraints?
275       "DROP CONSTRAINT #{quote_identifier(op[:name])}"
276     end
277   end
278 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
245 def alter_table_set_column_default_sql(table, op)
246   return super unless op[:default].nil?
247 
248   opts = schema(table).find{|x| x[0] == op[:name]}
249 
250   if opts && opts[1][:allow_null] == false
251     "ALTER COLUMN #{quote_identifier(op[:name])} DROP DEFAULT"
252   else
253     super
254   end
255 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
280 def alter_table_sql(table, op)
281   case op[:op]
282   when :drop_index
283     "#{drop_index_sql(table, op)} ON #{quote_schema_table(table)}"
284   when :drop_constraint
285     if op[:type] == :primary_key
286       if (pk = primary_key_from_schema(table)).length == 1
287         return [alter_table_sql(table, {:op=>:rename_column, :name=>pk.first, :new_name=>pk.first, :auto_increment=>false}), super]
288       end
289     end
290     super
291   else
292     super
293   end
294 end
auto_increment_sql() click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
345 def auto_increment_sql
346   'AUTO_INCREMENT'
347 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
350 def begin_new_transaction(conn, opts)
351   set_transaction_isolation(conn, opts)
352   log_connection_execute(conn, begin_transaction_sql)
353 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
357 def begin_transaction(conn, opts=OPTS)
358   if (s = opts[:prepare]) && savepoint_level(conn) == 1
359     log_connection_execute(conn, "XA START #{literal(s)}")
360   else
361     super
362   end
363 end
column_definition_default_sql(sql, column) click to toggle source

Support :on_update_current_timestamp option.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
366 def column_definition_default_sql(sql, column)
367   super
368   sql << " ON UPDATE CURRENT_TIMESTAMP" if column[:on_update_current_timestamp]
369 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
372 def column_definition_generated_sql(sql, column)
373   if (generated_expression = column[:generated_always_as])
374     sql << " GENERATED ALWAYS AS (#{literal(generated_expression)})"
375     case (type = column[:generated_type])
376     when nil
377       # none, database default
378     when :virtual
379       sql << " VIRTUAL"
380     when :stored
381       sql << (mariadb? ? " PERSISTENT" : " STORED")
382     else
383       raise Error, "unsupported :generated_type option: #{type.inspect}"
384     end
385   end
386 end
column_definition_order() click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
388 def column_definition_order
389   COLUMN_DEFINITION_ORDER
390 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
394 def column_definition_sql(column)
395   column.delete(:default) if column[:type] == File || (column[:type] == String && column[:text] == true)
396   super
397 end
column_schema_decimal_min_max_values(column) click to toggle source

Return nil if CHECK constraints are not supported, because versions that don't support check constraints don't raise errors for values outside of range.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
563 def column_schema_decimal_min_max_values(column)
564   super if supports_check_constraints?
565 end
column_schema_integer_min_max_values(column) click to toggle source

Return nil if CHECK constraints are not supported, because versions that don't support check constraints don't raise errors for values outside of range.

Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
556 def column_schema_integer_min_max_values(column)
557   super if supports_check_constraints?
558 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
297 def column_schema_normalize_default(default, type)
298   if column_schema_default_string_type?(type)
299     return if [:date, :datetime, :time].include?(type) && /\ACURRENT_(?:DATE|TIMESTAMP)?\z/.match(default)
300     default = "'#{default.gsub("'", "''").gsub('\\', '\\\\')}'"
301   end
302   super(default, type)
303 end
column_schema_to_ruby_default(default, type) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
305 def column_schema_to_ruby_default(default, type)
306   return Sequel::CURRENT_DATE if mariadb? && server_version >= 100200 && default == 'curdate()'
307   super
308 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
313 def combinable_alter_table_op?(op)
314   super && !(op[:op] == :add_constraint && op[:type] == :foreign_key) && !(op[:op] == :drop_constraint && op[:type] == :primary_key)
315 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
401 def commit_transaction(conn, opts=OPTS)
402   if (s = opts[:prepare]) && savepoint_level(conn) <= 1
403     log_connection_execute(conn, "XA END #{literal(s)}")
404     log_connection_execute(conn, "XA PREPARE #{literal(s)}")
405   else
406     super
407   end
408 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
411 def create_table_sql(name, generator, options = OPTS)
412   engine = options.fetch(:engine, default_engine)
413   charset = options.fetch(:charset, default_charset)
414   collate = options.fetch(:collate, default_collate)
415   generator.constraints.sort_by{|c| (c[:type] == :primary_key) ? -1 : 1}
416 
417   # Proc for figuring out the primary key for a given table.
418   key_proc = lambda do |t|
419     if t == name 
420       if pk = generator.primary_key_name
421         [pk]
422       elsif !(pkc = generator.constraints.select{|con| con[:type] == :primary_key}).empty?
423         pkc.first[:columns]
424       elsif !(pkc = generator.columns.select{|con| con[:primary_key] == true}).empty?
425         pkc.map{|c| c[:name]}
426       end
427     else
428       primary_key_from_schema(t)
429     end
430   end
431 
432   # Manually set the keys, since MySQL requires one, it doesn't use the primary
433   # key if none are specified.
434   generator.constraints.each do |c|
435     if c[:type] == :foreign_key
436       c[:key] ||= key_proc.call(c[:table])
437     end
438   end
439 
440   # Split column constraints into table constraints in some cases:
441   # foreign key - Always
442   # unique, primary_key - Only if constraint has a name
443   generator.columns.each do |c|
444     if t = c.delete(:table)
445       same_table = t == name
446       key = c[:key] || key_proc.call(t)
447 
448       if same_table && !key.nil?
449         generator.constraints.unshift(:type=>:unique, :columns=>Array(key))
450       end
451 
452       generator.foreign_key([c[:name]], t, c.merge(:name=>c[:foreign_key_constraint_name], :type=>:foreign_key, :key=>key))
453     end
454   end
455 
456   "#{super}#{" ENGINE=#{engine}" if engine}#{" DEFAULT CHARSET=#{charset}" if charset}#{" DEFAULT COLLATE=#{collate}" if collate}"
457 end
database_error_regexps() click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
467 def database_error_regexps
468   DATABASE_ERROR_REGEXPS
469 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
472 def full_tables(type, opts)
473   m = output_identifier_meth
474   metadata_dataset.with_sql('SHOW FULL TABLES').server(opts[:server]).map{|r| m.call(r.values.first) if r.delete(:Table_type) == type}.compact
475 end
index_definition_sql(table_name, index) click to toggle source
    # File lib/sequel/adapters/shared/mysql.rb
477 def index_definition_sql(table_name, index)
478   index_name = quote_identifier(index[:name] || default_index_name(table_name, index[:columns]))
479   raise Error, "Partial indexes are not supported for this database" if index[:where] && !supports_partial_indexes?
480   index_type = case index[:type]
481   when :full_text
482     "FULLTEXT "
483   when :spatial
484     "SPATIAL "
485   else
486     using = " USING #{index[:type]}" unless index[:type] == nil
487     "UNIQUE " if index[:unique]
488   end
489   "CREATE #{index_type}INDEX #{index_name}#{using} ON #{quote_schema_table(table_name)} #{literal(index[:columns])}"
490 end
mysql_connection_setting_sqls() click to toggle source

The SQL queries to execute on initial connection

    # File lib/sequel/adapters/shared/mysql.rb
318 def mysql_connection_setting_sqls
319   sqls = []
320   
321   if wait_timeout = opts.fetch(:timeout, 2147483)
322     # Increase timeout so mysql server doesn't disconnect us
323     # Value used by default is maximum allowed value on Windows.
324     sqls << "SET @@wait_timeout = #{wait_timeout}"
325   end
326 
327   # By default, MySQL 'where id is null' selects the last inserted id
328   sqls <<  "SET SQL_AUTO_IS_NULL=0" unless opts[:auto_is_null]
329 
330   # If the user has specified one or more sql modes, enable them
331   if sql_mode = opts[:sql_mode]
332     sql_mode = Array(sql_mode).join(',').upcase
333     sqls <<  "SET sql_mode = '#{sql_mode}'"
334   end
335 
336   # Disable the use of split_materialized in the optimizer. This is
337   # needed to pass association tests on MariaDB 10.5+.
338   if opts[:disable_split_materialized] && typecast_value_boolean(opts[:disable_split_materialized])
339     sqls <<  "SET SESSION optimizer_switch='split_materialized=off'"
340   end
341 
342   sqls
343 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
493 def primary_key_from_schema(table)
494   schema(table).select{|a| a[1][:primary_key]}.map{|a| a[0]}
495 end
rename_tables_sql(renames) click to toggle source

SQL statement for renaming multiple tables.

    # File lib/sequel/adapters/shared/mysql.rb
498 def rename_tables_sql(renames)
499   rename_tos = renames.map do |from, to|
500       "#{quote_schema_table(from)} TO #{quote_schema_table(to)}"
501   end.join(', ')
502   "RENAME TABLE #{rename_tos}"
503 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
506 def rollback_transaction(conn, opts=OPTS)
507   if (s = opts[:prepare]) && savepoint_level(conn) <= 1
508     log_connection_execute(conn, "XA END #{literal(s)}")
509     log_connection_execute(conn, "XA PREPARE #{literal(s)}")
510     log_connection_execute(conn, "XA ROLLBACK #{literal(s)}")
511   else
512     super
513   end
514 end
schema_column_type(db_type) click to toggle source
Calls superclass method
    # File lib/sequel/adapters/shared/mysql.rb
516 def schema_column_type(db_type)
517   case db_type
518   when /\Aset/io
519     :set
520   when /\Amediumint/io
521     :integer
522   when /\Amediumtext/io
523     :string
524   else
525     super
526   end
527 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
530 def schema_parse_table(table_name, opts)
531   m = output_identifier_meth(opts[:dataset])
532   im = input_identifier_meth(opts[:dataset])
533   table = SQL::Identifier.new(im.call(table_name))
534   table = SQL::QualifiedIdentifier.new(im.call(opts[:schema]), table) if opts[:schema]
535   metadata_dataset.with_sql("DESCRIBE ?", table).map do |row|
536     extra = row.delete(:Extra)
537     if row[:primary_key] = row.delete(:Key) == 'PRI'
538       row[:auto_increment] = !!(extra.to_s =~ /auto_increment/i)
539     end
540     if supports_generated_columns?
541       # Extra field contains VIRTUAL or PERSISTENT for generated columns
542       row[:generated] = !!(extra.to_s =~ /VIRTUAL|STORED|PERSISTENT/i)
543     end
544     row[:allow_null] = row.delete(:Null) == 'YES'
545     row[:default] = row.delete(:Default)
546     row[:db_type] = row.delete(:Type)
547     row[:type] = schema_column_type(row[:db_type])
548     row[:extra] = extra
549     [m.call(row.delete(:Field)), row]
550   end
551 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
569 def split_alter_table_op?(op)
570   server_version >= 50600 && (op[:op] == :drop_index || (op[:op] == :drop_constraint && op[:type] == :unique))
571 end
supports_check_constraints?() click to toggle source

CHECK constraints only supported on MariaDB 10.2+ and MySQL 8.0.19+ (at least MySQL documents DROP CONSTRAINT was supported in 8.0.19+).

    # File lib/sequel/adapters/shared/mysql.rb
575 def supports_check_constraints?
576   server_version >= (mariadb? ? 100200 : 80019)
577 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
580 def supports_combining_alter_table_ops?
581   true
582 end
supports_create_or_replace_view?() click to toggle source

MySQL supports CREATE OR REPLACE VIEW.

    # File lib/sequel/adapters/shared/mysql.rb
585 def supports_create_or_replace_view?
586   true
587 end
supports_named_column_constraints?() click to toggle source

MySQL does not support named column constraints.

    # File lib/sequel/adapters/shared/mysql.rb
590 def supports_named_column_constraints?
591   false
592 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
612 def type_literal_generic_datetime(column)
613   if supports_timestamp_usecs?
614     :'datetime(6)'
615   elsif column[:default] == Sequel::CURRENT_TIMESTAMP
616     :timestamp
617   else
618     :datetime
619   end
620 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
597 def type_literal_generic_file(column)
598   case column[:size]
599   when :tiny    # < 2^8 bytes
600     :tinyblob
601   when :medium  # < 2^24 bytes
602     :mediumblob
603   when :long    # < 2^32 bytes
604     :longblob
605   else          # 2^16 bytes
606     :blob
607   end
608 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
624 def type_literal_generic_only_time(column)
625   if supports_timestamp_usecs?
626     :'time(6)'
627   else
628     :time
629   end
630 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
633 def type_literal_generic_trueclass(column)
634   :'tinyint(1)'
635 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
638 def view_with_check_option_support
639   :local if server_version >= 50002
640 end