Class: ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter

Inherits:
AbstractAdapter
  • Object
show all
Includes:
Savepoints
Defined in:
lib/active_record/connection_adapters/abstract_mysql_adapter.rb

Direct Known Subclasses

Mysql2Adapter, MysqlAdapter

Defined Under Namespace

Classes: BindSubstitution, Column, SchemaCreation

Constant Summary collapse

LOST_CONNECTION_ERROR_MESSAGES =
[
"Server shutdown in progress",
"Broken pipe",
"Lost connection to MySQL server during query",
"MySQL server has gone away" ]
NATIVE_DATABASE_TYPES =
{
  :primary_key => "int(11) auto_increment PRIMARY KEY",
  :string      => { :name => "varchar", :limit => 255 },
  :text        => { :name => "text" },
  :integer     => { :name => "int", :limit => 4 },
  :float       => { :name => "float" },
  :decimal     => { :name => "decimal" },
  :datetime    => { :name => "datetime" },
  :timestamp   => { :name => "datetime" },
  :time        => { :name => "time" },
  :date        => { :name => "date" },
  :binary      => { :name => "blob" },
  :boolean     => { :name => "tinyint", :limit => 1 }
}
INDEX_TYPES =
[:fulltext, :spatial]
INDEX_USINGS =
[:btree, :hash]

Constants inherited from AbstractAdapter

ActiveRecord::ConnectionAdapters::AbstractAdapter::SIMPLE_INT

Instance Attribute Summary

Attributes inherited from AbstractAdapter

#in_use, #last_use, #logger, #pool, #schema_cache, #visitor

Attributes included from QueryCache

#query_cache, #query_cache_enabled

Instance Method Summary collapse

Methods included from Savepoints

#create_savepoint, #release_savepoint, #rollback_to_savepoint, #supports_savepoints?

Methods inherited from AbstractAdapter

#active?, #active_threadsafe?, #clear_cache!, #close, #create_savepoint, #current_savepoint_name, #disable_extension, #disconnect!, #enable_extension, #expire, #extensions, #lease, #open_transactions, #prefetch_primary_key?, #raw_connection, #reconnect!, #release_savepoint, #requires_reloading?, #reset!, #rollback_to_savepoint, #substitute_at, #supports_count_distinct?, #supports_ddl_transactions?, #supports_explain?, #supports_extensions?, #supports_partial_index?, #supports_savepoints?, type_cast_config_to_boolean, type_cast_config_to_integer, #unprepared_statement, #unprepared_visitor, #verify!

Methods included from ColumnDumper

#column_spec, #migration_keys, #prepare_column_options

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

#allowed_index_name_length, #column_name_length, #columns_per_multicolumn_index, #columns_per_table, #in_clause_length, #index_name_length, #indexes_per_table, #joins_per_query, #sql_query_length, #table_alias_length, #table_name_length

Methods included from Quoting

#quote_string, #quote_table_name_for_assignment, #quoted_date

Methods included from DatabaseStatements

#add_transaction_record, #begin_transaction, #commit_transaction, #current_transaction, #default_sequence_name, #delete, #exec_delete, #exec_insert, #exec_query, #exec_update, #insert, #insert_fixture, #join_to_delete, #reset_sequence!, #reset_transaction, #rollback_transaction, #sanitize_limit, #select_all, #select_one, #select_rows, #select_value, #select_values, #supports_statement_cache?, #to_sql, #transaction, #transaction_isolation_levels, #transaction_open?, #update, #within_new_transaction

Methods included from SchemaStatements

#add_column, #add_reference, #add_timestamps, #assume_migrated_upto_version, #change_table, #column_exists?, #columns_for_distinct, #create_join_table, #drop_join_table, #dump_schema_information, #index_exists?, #index_name, #index_name_exists?, #initialize_schema_migrations_table, #remove_column, #remove_columns, #remove_index, #remove_index!, #remove_reference, #remove_timestamps, #table_alias_for, #update_table_definition

Constructor Details

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

FIXME: Make the first parameter more similar for the two adapters



175
176
177
178
179
180
181
182
183
184
185
186
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 175

def initialize(connection, logger, connection_options, config)
  super(connection, logger)
  @connection_options, @config = connection_options, config
  @quoted_column_names, @quoted_table_names = {}, {}

  if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
    @prepared_statements = true
    @visitor = Arel::Visitors::MySQL.new self
  else
    @visitor = unprepared_visitor
  end
end

Instance Method Details

#adapter_nameObject

:nodoc:



188
189
190
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 188

def adapter_name #:nodoc:
  self.class::ADAPTER_NAME
end

#add_column_position!(sql, options) ⇒ Object



560
561
562
563
564
565
566
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 560

def add_column_position!(sql, options)
  if options[:first]
    sql << " FIRST"
  elsif options[:after]
    sql << " AFTER #{quote_column_name(options[:after])}"
  end
end

#add_index(table_name, column_name, options = {}) ⇒ Object

:nodoc:



523
524
525
526
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 523

def add_index(table_name, column_name, options = {}) #:nodoc:
  index_name, index_type, index_columns, index_options, index_algorithm, index_using = add_index_options(table_name, column_name, options)
  execute "CREATE #{index_type} INDEX #{quote_column_name(index_name)} #{index_using} ON #{quote_table_name(table_name)} (#{index_columns})#{index_options} #{index_algorithm}"
end

#begin_db_transactionObject



318
319
320
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 318

def begin_db_transaction
  execute "BEGIN"
end

#begin_isolated_db_transaction(isolation) ⇒ Object



322
323
324
325
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 322

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

#bulk_change_table(table_name, operations) ⇒ Object

:nodoc:



463
464
465
466
467
468
469
470
471
472
473
474
475
476
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 463

def bulk_change_table(table_name, operations) #:nodoc:
  sqls = operations.map do |command, args|
    table, arguments = args.shift, args
    method = :"#{command}_sql"

    if respond_to?(method, true)
      send(method, table, *arguments)
    else
      raise "Unknown method called : #{method}(#{arguments.inspect})"
    end
  end.flatten.join(", ")

  execute("ALTER TABLE #{quote_table_name(table_name)} #{sqls}")
end

#case_insensitive_comparison(table, attribute, column, value) ⇒ Object



597
598
599
600
601
602
603
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 597

def case_insensitive_comparison(table, attribute, column, value)
  if column.case_sensitive?
    super
  else
    table[attribute].eq(value)
  end
end

#case_sensitive_modifier(node) ⇒ Object



593
594
595
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 593

def case_sensitive_modifier(node)
  Arel::Nodes::Bin.new(node)
end

#change_column(table_name, column_name, type, options = {}) ⇒ Object

:nodoc:



514
515
516
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 514

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

#change_column_default(table_name, column_name, default) ⇒ Object



499
500
501
502
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 499

def change_column_default(table_name, column_name, default)
  column = column_for(table_name, column_name)
  change_column table_name, column_name, column.sql_type, :default => default
end

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



504
505
506
507
508
509
510
511
512
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 504

def change_column_null(table_name, column_name, null, default = nil)
  column = column_for(table_name, column_name)

  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, column.sql_type, :null => null
end

#charsetObject

Returns the database character set.



390
391
392
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 390

def charset
  show_variable 'character_set_database'
end

#collationObject

Returns the database collation strategy.



395
396
397
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 395

def collation
  show_variable 'collation_database'
end

#columns(table_name) ⇒ Object

Returns an array of Column objects for the table specified by table_name.



449
450
451
452
453
454
455
456
457
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 449

def columns(table_name)#:nodoc:
  sql = "SHOW FULL FIELDS FROM #{quote_table_name(table_name)}"
  execute_and_free(sql, 'SCHEMA') do |result|
    each_hash(result).map do |field|
      field_name = set_field_encoding(field[:Field])
      new_column(field_name, field[:Default], field[:Type], field[:Null] == "YES", field[:Collation], field[:Extra])
    end
  end
end

#commit_db_transactionObject

:nodoc:



327
328
329
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 327

def commit_db_transaction #:nodoc:
  execute "COMMIT"
end

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

Create a new MySQL database with optional :charset and :collation. Charset defaults to utf8.

Example:

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


369
370
371
372
373
374
375
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 369

def create_database(name, options = {})
  if options[:collation]
    execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}` COLLATE `#{options[:collation]}`"
  else
    execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}`"
  end
end

#create_table(table_name, options = {}) ⇒ Object

:nodoc:



459
460
461
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 459

def create_table(table_name, options = {}) #:nodoc:
  super(table_name, options.reverse_merge(:options => "ENGINE=InnoDB"))
end

#current_databaseObject



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

def current_database
  select_value 'SELECT DATABASE() as db'
end

#disable_referential_integrityObject

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



288
289
290
291
292
293
294
295
296
297
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 288

def disable_referential_integrity #:nodoc:
  old = select_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')


381
382
383
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 381

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

#drop_table(table_name, options = {}) ⇒ Object



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

def drop_table(table_name, options = {})
  execute "DROP#{' TEMPORARY' if options[:temporary]} TABLE #{quote_table_name(table_name)}"
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)


242
243
244
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 242

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

#empty_insert_statement_valueObject



347
348
349
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 347

def empty_insert_statement_value
  "VALUES ()"
end

#emulate_booleansObject

:singleton-method: By default, the MysqlAdapter will consider all columns of type tinyint(1) as boolean. If you wish to disable this emulation (which was the default behavior in versions 0.13.1 and earlier) you can add the following line to your application.rb file:

ActiveRecord::ConnectionAdapters::Mysql[2]Adapter.emulate_booleans = false


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

class_attribute :emulate_booleans

#error_number(exception) ⇒ Object

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

Raises:

  • (NotImplementedError)


253
254
255
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 253

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

#execute(sql, name = nil) ⇒ Object

Executes the SQL statement in the context of this connection.



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

def execute(sql, name = nil)
  log(sql, name) { @connection.query(sql) }
end

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

MysqlAdapter has to free a result after using it, so 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:



309
310
311
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 309

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

#index_algorithmsObject



234
235
236
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 234

def index_algorithms
  { default: 'ALGORITHM = DEFAULT', copy: 'ALGORITHM = COPY', inplace: 'ALGORITHM = INPLACE' }
end

#indexes(table_name, name = nil) ⇒ Object

Returns an array of indexes for the given table.



425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 425

def indexes(table_name, name = nil) #:nodoc:
  indexes = []
  current_index = nil
  execute_and_free("SHOW KEYS FROM #{quote_table_name(table_name)}", 'SCHEMA') do |result|
    each_hash(result) do |row|
      if current_index != row[:Key_name]
        next if row[:Key_name] == 'PRIMARY' # skip the primary key
        current_index = row[:Key_name]

        mysql_index_type = row[:Index_type].downcase.to_sym
        index_type  = INDEX_TYPES.include?(mysql_index_type)  ? mysql_index_type : nil
        index_using = INDEX_USINGS.include?(mysql_index_type) ? mysql_index_type : nil
        indexes << IndexDefinition.new(row[:Table], row[:Key_name], row[:Non_unique].to_i == 0, [], [], nil, nil, index_type, index_using)
      end

      indexes.last.columns << row[:Column_name]
      indexes.last.lengths << row[:Sub_part]
    end
  end

  indexes
end

#join_to_update(update, select) ⇒ Object

In the simple case, MySQL allows us to place JOINs directly into the UPDATE query. However, this does not allow for LIMIT, OFFSET and ORDER. To support these, we must use a subquery.



338
339
340
341
342
343
344
345
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 338

def join_to_update(update, select) #:nodoc:
  if select.limit || select.offset || select.orders.any?
    super
  else
    update.table select.source
    update.wheres = select.constraints
  end
end

#limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) ⇒ Object



605
606
607
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 605

def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
  where_sql
end

#native_database_typesObject



230
231
232
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 230

def native_database_types
  NATIVE_DATABASE_TYPES
end

#new_column(field, default, type, null, collation, extra = "") ⇒ Object

Overridden by the adapters to instantiate their specific Column type.



247
248
249
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 247

def new_column(field, default, type, null, collation, extra = "") # :nodoc:
  Column.new(field, default, type, null, collation, extra)
end

#pk_and_sequence_for(table) ⇒ Object

Returns a table’s primary key and belonging sequence.



575
576
577
578
579
580
581
582
583
584
585
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 575

def pk_and_sequence_for(table)
  execute_and_free("SHOW CREATE TABLE #{quote_table_name(table)}", 'SCHEMA') do |result|
    create_table = each_hash(result).first[:"Create Table"]
    if create_table.to_s =~ /PRIMARY KEY\s+(?:USING\s+\w+\s+)?\((.+)\)/
      keys = $1.split(",").map { |key| key.delete('`"') }
      keys.length == 1 ? [keys.first, nil] : nil
    else
      nil
    end
  end
end

#primary_key(table) ⇒ Object

Returns just a table’s primary key



588
589
590
591
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 588

def primary_key(table)
  pk_and_sequence = pk_and_sequence_for(table)
  pk_and_sequence && pk_and_sequence.first
end

#quote(value, column = nil) ⇒ Object

QUOTING ==================================================



259
260
261
262
263
264
265
266
267
268
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 259

def quote(value, column = nil)
  if value.kind_of?(String) && column && column.type == :binary
    s = value.unpack("H*")[0]
    "x'#{s}'"
  elsif value.kind_of?(BigDecimal)
    value.to_s("F")
  else
    super
  end
end

#quote_column_name(name) ⇒ Object

:nodoc:



270
271
272
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 270

def quote_column_name(name) #:nodoc:
  @quoted_column_names[name] ||= "`#{name.to_s.gsub('`', '``')}`"
end

#quote_table_name(name) ⇒ Object

:nodoc:



274
275
276
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 274

def quote_table_name(name) #:nodoc:
  @quoted_table_names[name] ||= quote_column_name(name).gsub('.', '`.`')
end

#quoted_falseObject



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

def quoted_false
  QUOTED_FALSE
end

#quoted_trueObject



278
279
280
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 278

def quoted_true
  QUOTED_TRUE
end

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

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



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

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

#rename_column(table_name, column_name, new_column_name) ⇒ Object

:nodoc:



518
519
520
521
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 518

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



491
492
493
494
495
496
497
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 491

def rename_index(table_name, old_name, new_name)
  if (version[0] == 5 && version[1] >= 7) || version[0] >= 6
    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')


482
483
484
485
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 482

def rename_table(table_name, new_name)
  execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
  rename_table_indexes(table_name, new_name)
end

#rollback_db_transactionObject

:nodoc:



331
332
333
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 331

def rollback_db_transaction #:nodoc:
  execute "ROLLBACK"
end

#schema_creationObject



34
35
36
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 34

def schema_creation
  SchemaCreation.new self
end

#show_variable(name) ⇒ Object

SHOW VARIABLES LIKE ‘name’



569
570
571
572
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 569

def show_variable(name)
  variables = select_all("SHOW VARIABLES LIKE '#{name}'", 'SCHEMA')
  variables.first['Value'] unless variables.empty?
end

#strict_mode?Boolean

Returns:

  • (Boolean)


609
610
611
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 609

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

#supports_bulk_alter?Boolean

:nodoc:

Returns:

  • (Boolean)


201
202
203
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 201

def supports_bulk_alter? #:nodoc:
  true
end

#supports_index_sort_order?Boolean

Technically MySQL allows to create indexes with the sort order syntax but at the moment (5.5) it doesn’t yet implement them

Returns:

  • (Boolean)


207
208
209
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 207

def supports_index_sort_order?
  true
end

#supports_migrations?Boolean

Returns true, since this connection adapter supports migrations.

Returns:

  • (Boolean)


193
194
195
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 193

def supports_migrations?
  true
end

#supports_primary_key?Boolean

Returns:

  • (Boolean)


197
198
199
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 197

def supports_primary_key?
  true
end

#supports_transaction_isolation?Boolean

MySQL 4 technically support transaction isolation, but it is affected by a bug where the transaction level gets persisted for the whole session:

bugs.mysql.com/bug.php?id=39170

Returns:

  • (Boolean)


226
227
228
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 226

def supports_transaction_isolation?
  version[0] >= 5
end

#table_exists?(name) ⇒ Boolean

Returns:

  • (Boolean)


409
410
411
412
413
414
415
416
417
418
419
420
421
422
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 409

def table_exists?(name)
  return false unless name
  return true if tables(nil, nil, name).any?

  name          = name.to_s
  schema, table = name.split('.', 2)

  unless table # A table was provided without a schema
    table  = schema
    schema = nil
  end

  tables(nil, schema, table).any?
end

#tables(name = nil, database = nil, like = nil) ⇒ Object

:nodoc:



399
400
401
402
403
404
405
406
407
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 399

def tables(name = nil, database = nil, like = nil) #:nodoc:
  sql = "SHOW TABLES "
  sql << "IN #{quote_table_name(database)} " if database
  sql << "LIKE #{quote(like)}" if like

  execute_and_free(sql, 'SCHEMA') do |result|
    result.collect { |field| field.first }
  end
end

#type_cast(value, column) ⇒ Object



211
212
213
214
215
216
217
218
219
220
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 211

def type_cast(value, column)
  case value
  when TrueClass
    1
  when FalseClass
    0
  else
    super
  end
end

#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object

Maps logical Rails types to MySQL-specific data types.



529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 529

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_s
  when 'binary'
    case limit
    when 0..0xfff;           "varbinary(#{limit})"
    when nil;                "blob"
    when 0x1000..0xffffffff; "blob(#{limit})"
    else raise(ActiveRecordError, "No binary type has character length #{limit}")
    end
  when 'integer'
    case limit
    when 1; 'tinyint'
    when 2; 'smallint'
    when 3; 'mediumint'
    when nil, 4, 11; 'int(11)'  # compatibility with MySQL default
    when 5..8; 'bigint'
    else raise(ActiveRecordError, "No integer type has byte size #{limit}")
    end
  when 'text'
    case limit
    when 0..0xff;               'tinytext'
    when nil, 0x100..0xffff;    'text'
    when 0x10000..0xffffff;     'mediumtext'
    when 0x1000000..0xffffffff; 'longtext'
    else raise(ActiveRecordError, "No text type has character length #{limit}")
    end
  else
    super
  end
end

#update_sql(sql, name = nil) ⇒ Object

:nodoc:



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

def update_sql(sql, name = nil) #:nodoc:
  super
  @connection.affected_rows
end

#valid_type?(type) ⇒ Boolean

Returns:

  • (Boolean)


613
614
615
# File 'lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 613

def valid_type?(type)
  !native_database_types[type].nil?
end