Class: ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter

Inherits:
AbstractAdapter show all
Includes:
MySQL::Quoting, MySQL::SchemaStatements
Defined in:
activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

Direct Known Subclasses

Mysql2Adapter

Defined Under Namespace

Classes: StatementPool

Constant Summary collapse

NATIVE_DATABASE_TYPES = 
{
  primary_key: "bigint auto_increment PRIMARY KEY",
  string:      { name: "varchar", limit: 255 },
  text:        { name: "text" },
  integer:     { name: "int", limit: 4 },
  bigint:      { name: "bigint" },
  float:       { name: "float", limit: 24 },
  decimal:     { name: "decimal" },
  datetime:    { name: "datetime" },
  timestamp:   { name: "timestamp" },
  time:        { name: "time" },
  date:        { name: "date" },
  binary:      { name: "blob" },
  blob:        { name: "blob" },
  boolean:     { name: "tinyint", limit: 1 },
  json:        { name: "json" },
}
TYPE_MAP = 
Type::TypeMap.new.tap { |m| initialize_type_map(m) }
EXTENDED_TYPE_MAPS = 
Concurrent::Map.new
EMULATE_BOOLEANS_TRUE = 
{ emulate_booleans: true }.freeze

Constants inherited from AbstractAdapter

ActiveRecord::ConnectionAdapters::AbstractAdapter::ADAPTER_NAME, ActiveRecord::ConnectionAdapters::AbstractAdapter::COMMENT_REGEX, ActiveRecord::ConnectionAdapters::AbstractAdapter::SIMPLE_INT

Constants included from ActiveSupport::Callbacks

ActiveSupport::Callbacks::CALLBACK_FILTER_TYPES

Instance Attribute Summary

Attributes inherited from AbstractAdapter

#lock, #logger, #owner, #pool, #visitor

Attributes included from QueryCache

#query_cache, #query_cache_enabled

Attributes included from DatabaseStatements

#transaction_manager

Class Method Summary collapse

Instance Method Summary collapse

Methods included from MySQL::SchemaStatements

#create_schema_dumper, #create_table, #indexes, #internal_string_options_for_primary_key, #remove_column, #table_alias_length, #type_to_sql, #update_table_definition

Methods included from MySQL::Quoting

#column_name_matcher, #column_name_with_order_matcher, #quote_bound_value, #quote_column_name, #quote_table_name, #quoted_binary, #quoted_date, #type_cast, #unquoted_false, #unquoted_true

Methods inherited from AbstractAdapter

#active?, #adapter_name, #advisory_locks_enabled?, #all_foreign_keys_valid?, #async_enabled?, build_read_query_regexp, #case_insensitive_comparison, #check_if_write_query, #clear_cache!, #close, #connection_class, #create_enum, database_exists?, #database_version, #default_timezone, #default_uniqueness_comparison, #disable_extension, #discard!, #disconnect!, #enable_extension, #expire, #extensions, #lease, #migration_context, #migrations_paths, #prefetch_primary_key?, #prepared_statements?, #prepared_statements_disabled_cache, #preventing_writes?, quoted_column_names, quoted_table_names, #raw_connection, #reconnect!, register_class_with_precision, #replica?, #requires_reloading?, #reset!, #role, #savepoint_errors_invalidate_transactions?, #schema_cache, #schema_cache=, #schema_migration, #schema_version, #seconds_idle, #shard, #steal!, #supports_comments?, #supports_comments_in_create?, #supports_concurrent_connections?, #supports_ddl_transactions?, #supports_deferrable_constraints?, #supports_extensions?, #supports_foreign_tables?, #supports_insert_conflict_target?, #supports_insert_returning?, #supports_json?, #supports_lazy_transactions?, #supports_materialized_views?, #supports_partial_index?, #supports_partitioned_indexes?, #supports_savepoints?, #supports_validate_constraints?, #throw_away!, type_cast_config_to_boolean, type_cast_config_to_integer, #unprepared_statement, #use_metadata_table?, #valid_type?, validate_default_timezone, #verify!, #with_instrumenter

Methods included from Savepoints

#create_savepoint, #current_savepoint_name, #exec_rollback_to_savepoint, #release_savepoint

Methods included from QueryCache

#cache, #clear_query_cache, dirties_query_cache, #disable_query_cache!, #enable_query_cache!, included, #select_all, #uncached

Methods included from DatabaseLimits

#index_name_length, #max_identifier_length, #table_alias_length

Methods included from Quoting

#column_name_matcher, #column_name_with_order_matcher, #lookup_cast_type_from_column, #quote, #quote_bound_value, #quote_column_name, #quote_default_expression, #quote_string, #quote_table_name, #quote_table_name_for_assignment, #quoted_binary, #quoted_date, #quoted_false, #quoted_time, #quoted_true, #sanitize_as_sql_comment, #type_cast, #unquoted_false, #unquoted_true

Methods included from DatabaseStatements

#add_transaction_record, #cacheable_query, #default_sequence_name, #delete, #exec_delete, #exec_insert, #exec_insert_all, #exec_query, #exec_update, #explain, #high_precision_current_timestamp, #insert, #insert_fixture, #insert_fixtures_set, #mark_transaction_written_if_write, #query, #query_value, #query_values, #reset_sequence!, #reset_transaction, #restart_db_transaction, #rollback_db_transaction, #rollback_to_savepoint, #sanitize_limit, #select_all, #select_one, #select_rows, #select_value, #select_values, #to_sql, #transaction, #transaction_isolation_levels, #transaction_open?, #truncate, #truncate_tables, #update, #with_yaml_fallback, #write_query?

Methods included from SchemaStatements

#add_check_constraint, #add_column, #add_columns, #add_foreign_key, #add_index_options, #add_reference, #add_timestamps, #assume_migrated_upto_version, #change_table, #check_constraint_options, #column_exists?, #columns, #create_join_table, #create_schema_dumper, #create_table, #data_source_exists?, #data_sources, #distinct_relation_for_primary_key, #drop_join_table, #dump_schema_information, #foreign_key_column_for, #foreign_key_exists?, #foreign_key_options, #index_algorithm, #index_exists?, #index_name, #index_name_exists?, #indexes, #internal_string_options_for_primary_key, #options_include_default?, #primary_key, #quoted_columns_for_index, #remove_check_constraint, #remove_column, #remove_columns, #remove_foreign_key, #remove_index, #remove_reference, #remove_timestamps, #table_alias_for, #table_exists?, #tables, #type_to_sql, #update_table_definition, #view_exists?, #views

Methods included from ActiveSupport::Callbacks

#run_callbacks

Methods included from ActiveSupport::Concern

#append_features, #class_methods, extended, #included, #prepend_features, #prepended

Constructor Details

#initialize(connection, logger, connection_options, config) ⇒ AbstractMysqlAdapter

Returns a new instance of AbstractMysqlAdapter.


54
55
56
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 54

def initialize(connection, logger, connection_options, config)
  super(connection, logger, config)
end

Class Method Details

.extended_type_map(default_timezone: nil, emulate_booleans:) ⇒ Object

:nodoc:


572
573
574
575
576
577
578
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 572

def extended_type_map(default_timezone: nil, emulate_booleans:) # :nodoc:
  super(default_timezone: default_timezone).tap do |m|
    if emulate_booleans
      m.register_type %r(^tinyint\(1\))i, Type::Boolean.new
    end
  end
end

Instance Method Details

#add_index(table_name, column_name, **options) ⇒ Object

:nodoc:


376
377
378
379
380
381
382
383
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 376

def add_index(table_name, column_name, **options) # :nodoc:
  index, algorithm, if_not_exists = add_index_options(table_name, column_name, **options)

  return if if_not_exists && index_exists?(table_name, column_name, name: index.name)

  create_index = CreateIndexDefinition.new(index, algorithm)
  execute schema_creation.accept(create_index)
end

#add_sql_comment!(sql, comment) ⇒ Object

:nodoc:


385
386
387
388
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 385

def add_sql_comment!(sql, comment) # :nodoc:
  sql << " COMMENT #{quote(comment)}" if comment.present?
  sql
end

#begin_db_transaction ⇒ Object

:nodoc:


214
215
216
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 214

def begin_db_transaction # :nodoc:
  execute("BEGIN", "TRANSACTION")
end

#begin_isolated_db_transaction(isolation) ⇒ Object

:nodoc:


218
219
220
221
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 218

def begin_isolated_db_transaction(isolation) # :nodoc:
  execute "SET TRANSACTION ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}"
  begin_db_transaction
end

#build_insert_sql(insert) ⇒ Object

:nodoc:


546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 546

def build_insert_sql(insert) # :nodoc:
  sql = +"INSERT #{insert.into} #{insert.values_list}"

  if insert.skip_duplicates?
    no_op_column = quote_column_name(insert.keys.first)
    sql << " ON DUPLICATE KEY UPDATE #{no_op_column}=#{no_op_column}"
  elsif insert.update_duplicates?
    sql << " ON DUPLICATE KEY UPDATE "
    if insert.raw_update_sql?
      sql << insert.raw_update_sql
    else
      sql << insert.touch_model_timestamps_unless { |column| "#{column}<=>VALUES(#{column})" }
      sql << insert.updatable_columns.map { |column| "#{column}=VALUES(#{column})" }.join(",")
    end
  end

  sql
end

#case_sensitive_comparison(attribute, value) ⇒ Object

:nodoc:


508
509
510
511
512
513
514
515
516
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 508

def case_sensitive_comparison(attribute, value) # :nodoc:
  column = column_for_attribute(attribute)

  if column.collation && !column.case_sensitive?
    attribute.eq(Arel::Nodes::Bin.new(value))
  else
    super
  end
end

#change_column(table_name, column_name, type, **options) ⇒ Object

:nodoc:


367
368
369
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 367

def change_column(table_name, column_name, type, **options) # :nodoc:
  execute("ALTER TABLE #{quote_table_name(table_name)} #{change_column_for_alter(table_name, column_name, type, **options)}")
end

#change_column_comment(table_name, column_name, comment_or_changes) ⇒ Object

:nodoc:


362
363
364
365
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 362

def change_column_comment(table_name, column_name, comment_or_changes) # :nodoc:
  comment = extract_new_comment_value(comment_or_changes)
  change_column table_name, column_name, nil, comment: comment
end

#change_column_default(table_name, column_name, default_or_changes) ⇒ Object

:nodoc:


349
350
351
352
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 349

def change_column_default(table_name, column_name, default_or_changes) # :nodoc:
  default = extract_new_default_value(default_or_changes)
  change_column table_name, column_name, nil, default: default
end

#change_column_null(table_name, column_name, null, default = nil) ⇒ Object

:nodoc:


354
355
356
357
358
359
360
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 354

def change_column_null(table_name, column_name, null, default = nil) # :nodoc:
  unless null || default.nil?
    execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
  end

  change_column table_name, column_name, nil, null: null
end

#change_table_comment(table_name, comment_or_changes) ⇒ Object

:nodoc:


302
303
304
305
306
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 302

def change_table_comment(table_name, comment_or_changes) # :nodoc:
  comment = extract_new_comment_value(comment_or_changes)
  comment = "" if comment.nil?
  execute("ALTER TABLE #{quote_table_name(table_name)} COMMENT #{quote(comment)}")
end

#charset ⇒ Object

Returns the database character set.


282
283
284
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 282

def charset
  show_variable "character_set_database"
end

#check_constraints(table_name) ⇒ Object 


426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 426

def check_constraints(table_name)
  if supports_check_constraints?
    scope = quoted_scope(table_name)

    sql = <<~SQL
      SELECT cc.constraint_name AS 'name',
            cc.check_clause AS 'expression'
      FROM information_schema.check_constraints cc
      JOIN information_schema.table_constraints tc
      USING (constraint_schema, constraint_name)
      WHERE tc.table_schema = #{scope[:schema]}
        AND tc.table_name = #{scope[:name]}
        AND cc.constraint_schema = #{scope[:schema]}
    SQL
    sql += " AND cc.table_name = #{scope[:name]}" if mariadb?

    chk_info = exec_query(sql, "SCHEMA")

    chk_info.map do |row|
      options = {
        name: row["name"]
      }
      expression = row["expression"]
      expression = expression[1..-2] unless mariadb? # remove parentheses added by mysql
      CheckConstraintDefinition.new(table_name, expression, options)
    end
  else
    raise NotImplementedError
  end
end

#check_version ⇒ Object

:nodoc:


565
566
567
568
569
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 565

def check_version # :nodoc:
  if database_version < "5.5.8"
    raise "Your version of MySQL (#{database_version}) is too old. Active Record supports MySQL >= 5.5.8."
  end
end

#collation ⇒ Object

Returns the database collation strategy.


287
288
289
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 287

def collation
  show_variable "collation_database"
end

#columns_for_distinct(columns, orders) ⇒ Object

In MySQL 5.7.5 and up, ONLY_FULL_GROUP_BY affects handling of queries that use DISTINCT and ORDER BY. It requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column. See dev.mysql.com/doc/refman/en/group-by-handling.html


527
528
529
530
531
532
533
534
535
536
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 527

def columns_for_distinct(columns, orders) # :nodoc:
  order_columns = orders.compact_blank.map { |s|
    # Convert Arel node to string
    s = visitor.compile(s) unless s.is_a?(String)
    # Remove any ASC/DESC modifiers
    s.gsub(/\s+(?:ASC|DESC)\b/i, "")
  }.compact_blank.map.with_index { |column, i| "#{column} AS alias_#{i}" }

  (order_columns << super).join(", ")
end

#commit_db_transaction ⇒ Object

:nodoc:


223
224
225
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 223

def commit_db_transaction # :nodoc:
  execute("COMMIT", "TRANSACTION")
end

#create_database(name, options = {}) ⇒ Object

Create a new MySQL database with optional :charset and :collation. Charset defaults to utf8mb4.

Example:

create_database 'charset_test', charset: 'latin1', collation: 'latin1_bin'
create_database 'matt_development'
create_database 'matt_development', charset: :big5


257
258
259
260
261
262
263
264
265
266
267
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 257

def create_database(name, options = {})
  if options[:collation]
    execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT COLLATE #{quote_table_name(options[:collation])}"
  elsif options[:charset]
    execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT CHARACTER SET #{quote_table_name(options[:charset])}"
  elsif row_format_dynamic_by_default?
    execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT CHARACTER SET `utf8mb4`"
  else
    raise "Configure a supported :charset and ensure innodb_large_prefix is enabled to support indexes on varchar(255) string columns."
  end
end

#current_database ⇒ Object 


277
278
279
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 277

def current_database
  query_value("SELECT database()", "SCHEMA")
end

#default_index_type?(index) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 

542
543
544
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 542

def default_index_type?(index) # :nodoc:
  index.using == :btree || super
end

#disable_referential_integrity ⇒ Object

REFERENTIAL INTEGRITY ====================================


187
188
189
190
191
192
193
194
195
196
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 187

def disable_referential_integrity # :nodoc:
  old = query_value("SELECT @@FOREIGN_KEY_CHECKS")

  begin
    update("SET FOREIGN_KEY_CHECKS = 0")
    yield
  ensure
    update("SET FOREIGN_KEY_CHECKS = #{old}")
  end
end

#drop_database(name) ⇒ Object

Drops a MySQL database.

Example:

drop_database('sebastian_development')


273
274
275
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 273

def drop_database(name) # :nodoc:
  execute "DROP DATABASE IF EXISTS #{quote_table_name(name)}"
end

#drop_table(table_name, **options) ⇒ Object

Drops a table from the database.

:force

Set to :cascade to drop dependent objects as well. Defaults to false.

:if_exists

Set to true to only drop the table if it exists. Defaults to false.

:temporary

Set to true to drop temporary table. Defaults to false.

Although this command ignores most options and the block if one is given, it can be helpful to provide these in a migration's change method so it can be reverted. In that case, options and the block will be used by create_table.


334
335
336
337
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 334

def drop_table(table_name, **options)
  schema_cache.clear_data_source_cache!(table_name.to_s)
  execute "DROP#{' TEMPORARY' if options[:temporary]} TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
end

#each_hash(result) ⇒ Object

The two drivers have slightly different ways of yielding hashes of results, so this method must be implemented to provide a uniform interface.

Raises:

  • (NotImplementedError) 

175
176
177
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 175

def each_hash(result) # :nodoc:
  raise NotImplementedError
end

#empty_insert_statement_value(primary_key = nil) ⇒ Object

:nodoc:


235
236
237
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 235

def empty_insert_statement_value(primary_key = nil) # :nodoc:
  "VALUES ()"
end

#emulate_booleans ⇒ Object

:singleton-method: By default, the Mysql2Adapter will consider all columns of type tinyint(1) as boolean. If you wish to disable this emulation you can add the following line to your application.rb file:

ActiveRecord::ConnectionAdapters::Mysql2Adapter.emulate_booleans = false


27
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 27

class_attribute :emulate_booleans, default: true

#error_number(exception) ⇒ Object

Must return the MySQL error number from the exception, if the exception has an error number.

Raises:

  • (NotImplementedError) 

181
182
183
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 181

def error_number(exception) # :nodoc:
  raise NotImplementedError
end

#exec_restart_db_transaction ⇒ Object

:nodoc:


231
232
233
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 231

def exec_restart_db_transaction # :nodoc:
  execute("ROLLBACK AND CHAIN", "TRANSACTION")
end

#exec_rollback_db_transaction ⇒ Object

:nodoc:


227
228
229
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 227

def exec_rollback_db_transaction # :nodoc:
  execute("ROLLBACK", "TRANSACTION")
end

#execute(sql, name = nil, async: false) ⇒ Object

Executes the SQL statement in the context of this connection.


203
204
205
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 203

def execute(sql, name = nil, async: false)
  raw_execute(sql, name, async: async)
end

#execute_and_free(sql, name = nil, async: false) {|execute(sql, name, async: async)| ... } ⇒ Object

Mysql2Adapter doesn't have to free a result after using it, but we use this method to write stuff in an abstract way without concerning ourselves about whether it needs to be explicitly freed or not.

Yields:

  • (execute(sql, name, async: async)) 

210
211
212
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 210

def execute_and_free(sql, name = nil, async: false) # :nodoc:
  yield execute(sql, name, async: async)
end

#field_ordered_value(column, values) ⇒ Object

:nodoc:


145
146
147
148
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 145

def field_ordered_value(column, values) # :nodoc:
  field = Arel::Nodes::NamedFunction.new("FIELD", [column, values.reverse])
  Arel::Nodes::Descending.new(field)
end

#foreign_keys(table_name) ⇒ Object

Raises:

  • (ArgumentError) 

390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 390

def foreign_keys(table_name)
  raise ArgumentError unless table_name.present?

  scope = quoted_scope(table_name)

  fk_info = exec_query(<<~SQL, "SCHEMA")
    SELECT fk.referenced_table_name AS 'to_table',
           fk.referenced_column_name AS 'primary_key',
           fk.column_name AS 'column',
           fk.constraint_name AS 'name',
           rc.update_rule AS 'on_update',
           rc.delete_rule AS 'on_delete'
    FROM information_schema.referential_constraints rc
    JOIN information_schema.key_column_usage fk
    USING (constraint_schema, constraint_name)
    WHERE fk.referenced_column_name IS NOT NULL
      AND fk.table_schema = #{scope[:schema]}
      AND fk.table_name = #{scope[:name]}
      AND rc.constraint_schema = #{scope[:schema]}
      AND rc.table_name = #{scope[:name]}
  SQL

  fk_info.map do |row|
    options = {
      column: row["column"],
      name: row["name"],
      primary_key: row["primary_key"]
    }

    options[:on_update] = extract_foreign_key_action(row["on_update"])
    options[:on_delete] = extract_foreign_key_action(row["on_delete"])

    ForeignKeyDefinition.new(table_name, row["to_table"], options)
  end
end

#get_advisory_lock(lock_name, timeout = 0) ⇒ Object

:nodoc:


150
151
152
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 150

def get_advisory_lock(lock_name, timeout = 0) # :nodoc:
  query_value("SELECT GET_LOCK(#{quote(lock_name.to_s)}, #{timeout})") == 1
end

#get_database_version ⇒ Object

:nodoc:


58
59
60
61
62
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 58

def get_database_version # :nodoc:
  full_version_string = get_full_version
  version_string = version_string(full_version_string)
  Version.new(version_string, full_version_string)
end

#index_algorithms ⇒ Object 


162
163
164
165
166
167
168
169
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 162

def index_algorithms
  {
    default: "ALGORITHM = DEFAULT",
    copy:    "ALGORITHM = COPY",
    inplace: "ALGORITHM = INPLACE",
    instant: "ALGORITHM = INSTANT",
  }
end

#mariadb? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 

64
65
66
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 64

def mariadb? # :nodoc:
  /mariadb/i.match?(full_version)
end

#native_database_types ⇒ Object 


158
159
160
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 158

def native_database_types
  NATIVE_DATABASE_TYPES
end

#primary_keys(table_name) ⇒ Object

:nodoc:

Raises:

  • (ArgumentError) 

493
494
495
496
497
498
499
500
501
502
503
504
505
506
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 493

def primary_keys(table_name) # :nodoc:
  raise ArgumentError unless table_name.present?

  scope = quoted_scope(table_name)

  query_values(<<~SQL, "SCHEMA")
    SELECT column_name
    FROM information_schema.statistics
    WHERE index_name = 'PRIMARY'
      AND table_schema = #{scope[:schema]}
      AND table_name = #{scope[:name]}
    ORDER BY seq_in_index
  SQL
end

#recreate_database(name, options = {}) ⇒ Object

Drops the database specified on the name attribute and creates it again using the provided options.


243
244
245
246
247
248
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 243

def recreate_database(name, options = {})
  drop_database(name)
  sql = create_database(name, options)
  reconnect!
  sql
end

#release_advisory_lock(lock_name) ⇒ Object

:nodoc:


154
155
156
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 154

def release_advisory_lock(lock_name) # :nodoc:
  query_value("SELECT RELEASE_LOCK(#{quote(lock_name.to_s)})") == 1
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

:nodoc:


371
372
373
374
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 371

def rename_column(table_name, column_name, new_column_name) # :nodoc:
  execute("ALTER TABLE #{quote_table_name(table_name)} #{rename_column_for_alter(table_name, column_name, new_column_name)}")
  rename_column_indexes(table_name, column_name, new_column_name)
end

#rename_index(table_name, old_name, new_name) ⇒ Object 


339
340
341
342
343
344
345
346
347
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 339

def rename_index(table_name, old_name, new_name)
  if supports_rename_index?
    validate_index_length!(table_name, new_name)

    execute "ALTER TABLE #{quote_table_name(table_name)} RENAME INDEX #{quote_table_name(old_name)} TO #{quote_table_name(new_name)}"
  else
    super
  end
end

#rename_table(table_name, new_name) ⇒ Object

Renames a table.

Example:

rename_table('octopuses', 'octopi')


312
313
314
315
316
317
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 312

def rename_table(table_name, new_name)
  schema_cache.clear_data_source_cache!(table_name.to_s)
  schema_cache.clear_data_source_cache!(new_name.to_s)
  execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
  rename_table_indexes(table_name, new_name)
end

#show_variable(name) ⇒ Object

SHOW VARIABLES LIKE 'name'


487
488
489
490
491
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 487

def show_variable(name)
  query_value("SELECT @@#{name}", "SCHEMA")
rescue ActiveRecord::StatementInvalid
  nil
end

#strict_mode? ⇒ Boolean

Returns:

  • (Boolean) 

538
539
540
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 538

def strict_mode?
  self.class.type_cast_config_to_boolean(@config.fetch(:strict, true))
end

#supports_advisory_locks? ⇒ Boolean

Returns:

  • (Boolean) 

133
134
135
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 133

def supports_advisory_locks?
  true
end

#supports_bulk_alter? ⇒ Boolean

Returns:

  • (Boolean) 

68
69
70
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 68

def supports_bulk_alter?
  true
end

#supports_check_constraints? ⇒ Boolean

Returns:

  • (Boolean) 

100
101
102
103
104
105
106
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 100

def supports_check_constraints?
  if mariadb?
    database_version >= "10.2.1"
  else
    database_version >= "8.0.16"
  end
end

#supports_common_table_expressions? ⇒ Boolean

Returns:

  • (Boolean) 

125
126
127
128
129
130
131
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 125

def supports_common_table_expressions?
  if mariadb?
    database_version >= "10.2.1"
  else
    database_version >= "8.0.1"
  end
end

#supports_datetime_with_precision? ⇒ Boolean

Returns:

  • (Boolean) 

112
113
114
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 112

def supports_datetime_with_precision?
  mariadb? || database_version >= "5.6.4"
end

#supports_explain? ⇒ Boolean

Returns:

  • (Boolean) 

88
89
90
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 88

def supports_explain?
  true
end

#supports_expression_index? ⇒ Boolean

Returns:

  • (Boolean) 

76
77
78
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 76

def supports_expression_index?
  !mariadb? && database_version >= "8.0.13"
end

#supports_foreign_keys? ⇒ Boolean

Returns:

  • (Boolean) 

96
97
98
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 96

def supports_foreign_keys?
  true
end

#supports_index_sort_order? ⇒ Boolean

Returns:

  • (Boolean) 

72
73
74
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 72

def supports_index_sort_order?
  !mariadb? && database_version >= "8.0.1"
end

#supports_indexes_in_create? ⇒ Boolean

Returns:

  • (Boolean) 

92
93
94
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 92

def supports_indexes_in_create?
  true
end

#supports_insert_on_duplicate_skip? ⇒ Boolean

Returns:

  • (Boolean) 

137
138
139
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 137

def supports_insert_on_duplicate_skip?
  true
end

#supports_insert_on_duplicate_update? ⇒ Boolean

Returns:

  • (Boolean) 

141
142
143
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 141

def supports_insert_on_duplicate_update?
  true
end

#supports_optimizer_hints? ⇒ Boolean

See dev.mysql.com/doc/refman/en/optimizer-hints.html for more details.

Returns:

  • (Boolean) 

121
122
123
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 121

def supports_optimizer_hints?
  !mariadb? && database_version >= "5.7.7"
end

#supports_restart_db_transaction? ⇒ Boolean

Returns:

  • (Boolean) 

84
85
86
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 84

def supports_restart_db_transaction?
  true
end

#supports_transaction_isolation? ⇒ Boolean

Returns:

  • (Boolean) 

80
81
82
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 80

def supports_transaction_isolation?
  true
end

#supports_views? ⇒ Boolean

Returns:

  • (Boolean) 

108
109
110
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 108

def supports_views?
  true
end

#supports_virtual_columns? ⇒ Boolean

Returns:

  • (Boolean) 

116
117
118
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 116

def supports_virtual_columns?
  mariadb? || database_version >= "5.7.5"
end

#table_comment(table_name) ⇒ Object

:nodoc:


291
292
293
294
295
296
297
298
299
300
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 291

def table_comment(table_name) # :nodoc:
  scope = quoted_scope(table_name)

  query_value(<<~SQL, "SCHEMA").presence
    SELECT table_comment
    FROM information_schema.tables
    WHERE table_schema = #{scope[:schema]}
      AND table_name = #{scope[:name]}
  SQL
end

#table_options(table_name) ⇒ Object

:nodoc:


457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
 
# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 457

def table_options(table_name) # :nodoc:
  create_table_info = create_table_info(table_name)

  # strip create_definitions and partition_options
  # Be aware that `create_table_info` might not include any table options due to `NO_TABLE_OPTIONS` sql mode.
  raw_table_options = create_table_info.sub(/\A.*\n\) ?/m, "").sub(/\n\/\*!.*\*\/\n\z/m, "").strip

  return if raw_table_options.empty?

  table_options = {}

  if / DEFAULT CHARSET=(?<charset>\w+)(?: COLLATE=(?<collation>\w+))?/ =~ raw_table_options
    raw_table_options = $` + $' # before part + after part
    table_options[:charset] = charset
    table_options[:collation] = collation if collation
  end

  # strip AUTO_INCREMENT
  raw_table_options.sub!(/(ENGINE=\w+)(?: AUTO_INCREMENT=\d+)/, '\1')

  # strip COMMENT
  if raw_table_options.sub!(/ COMMENT='.+'/, "")
    table_options[:comment] = table_comment(table_name)
  end

  table_options[:options] = raw_table_options unless raw_table_options == "ENGINE=InnoDB"
  table_options
end