Class: ActiveRecord::ConnectionAdapters::Mysql2Adapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/mysql2_adapter.rb

Constant Summary collapse

ADAPTER_NAME =
'Mysql2'
PRIMARY =
"PRIMARY"
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) DEFAULT NULL 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 }
}

Instance Method Summary collapse

Constructor Details

#initialize(connection, logger, connection_options, config) ⇒ Mysql2Adapter

Returns a new instance of Mysql2Adapter.



119
120
121
122
123
124
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 119

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

Instance Method Details

#active?Boolean

CONNECTION MANAGEMENT ====================================

Returns:

  • (Boolean)


194
195
196
197
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 194

def active?
  return false unless @connection
  @connection.ping
end

#adapter_nameObject



126
127
128
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 126

def adapter_name
  ADAPTER_NAME
end

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



428
429
430
431
432
433
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 428

def add_column(table_name, column_name, type, options = {})
  add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
  add_column_options!(add_column_sql, options)
  add_column_position!(add_column_sql, options)
  execute(add_column_sql)
end

#add_column_position!(sql, options) ⇒ Object



495
496
497
498
499
500
501
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 495

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

#add_limit_offset!(sql, options) ⇒ Object



316
317
318
319
320
321
322
323
324
325
326
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 316

def add_limit_offset!(sql, options)
  limit, offset = options[:limit], options[:offset]
  if limit && offset
    sql << " LIMIT #{offset.to_i}, #{sanitize_limit(limit)}"
  elsif limit
    sql << " LIMIT #{sanitize_limit(limit)}"
  elsif offset
    sql << " OFFSET #{offset.to_i}"
  end
  sql
end

#begin_db_transactionObject



286
287
288
289
290
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 286

def begin_db_transaction
  execute "BEGIN"
rescue Exception
  # Transactions aren't supported
end

#case_sensitive_equality_operatorObject



523
524
525
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 523

def case_sensitive_equality_operator
  "= BINARY"
end

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



450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 450

def change_column(table_name, column_name, type, options = {})
  column = column_for(table_name, column_name)

  unless options_include_default?(options)
    options[:default] = column.default
  end

  unless options.has_key?(:null)
    options[:null] = column.null
  end

  change_column_sql = "ALTER TABLE #{quote_table_name(table_name)} CHANGE #{quote_column_name(column_name)} #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
  add_column_options!(change_column_sql, options)
  add_column_position!(change_column_sql, options)
  execute(change_column_sql)
end

#change_column_default(table_name, column_name, default) ⇒ Object



435
436
437
438
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 435

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



440
441
442
443
444
445
446
447
448
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 440

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.



372
373
374
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 372

def charset
  show_variable 'character_set_database'
end

#collationObject

Returns the database collation strategy.



377
378
379
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 377

def collation
  show_variable 'collation_database'
end

#columns(table_name, name = nil) ⇒ Object



410
411
412
413
414
415
416
417
418
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 410

def columns(table_name, name = nil)
  sql = "SHOW FIELDS FROM #{quote_table_name(table_name)}"
  columns = []
  result = execute(sql, :skip_logging)
  result.each(:symbolize_keys => true, :as => :hash) { |field|
    columns << Mysql2Column.new(field[:Field], field[:Default], field[:Type], field[:Null] == "YES")
  }
  columns
end

#commit_db_transactionObject



292
293
294
295
296
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 292

def commit_db_transaction
  execute "COMMIT"
rescue Exception
  # Transactions aren't supported
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


355
356
357
358
359
360
361
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 355

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_savepointObject



304
305
306
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 304

def create_savepoint
  execute("SAVEPOINT #{current_savepoint_name}")
end

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



420
421
422
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 420

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

#current_databaseObject



367
368
369
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 367

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

#disable_referential_integrity(&block) ⇒ Object

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



181
182
183
184
185
186
187
188
189
190
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 181

def disable_referential_integrity(&block) #: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

#disconnect!Object



209
210
211
212
213
214
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 209

def disconnect!
  unless @connection.nil?
    @connection.close
    @connection = nil
  end
end

#drop_database(name) ⇒ Object

:nodoc:



363
364
365
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 363

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

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



389
390
391
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 389

def drop_table(table_name, options = {})
  super(table_name, options)
end

#execute(sql, name = nil) ⇒ Object

Executes the SQL statement in the context of this connection.



258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 258

def execute(sql, name = nil)
  # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
  # made since we established the connection
  @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
  if name == :skip_logging
    @connection.query(sql)
  else
    log(sql, name) { @connection.query(sql) }
  end
rescue ActiveRecord::StatementInvalid => exception
  if exception.message.split(":").first =~ /Packets out of order/
    raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information.  If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
  else
    raise
  end
end

#indexes(table_name, name = nil) ⇒ Object



393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 393

def indexes(table_name, name = nil)
  indexes = []
  current_index = nil
  result = execute("SHOW KEYS FROM #{quote_table_name(table_name)}", name)
  result.each(:symbolize_keys => true, :as => :hash) do |row|
    if current_index != row[:Key_name]
      next if row[:Key_name] == PRIMARY # skip the primary key
      current_index = row[:Key_name]
      indexes << Mysql2IndexDefinition.new(row[:Table], row[:Key_name], row[:Non_unique] == 0, [], [])
    end

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

#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object Also known as: create



275
276
277
278
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 275

def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  super
  id_value || @connection.last_id
end

#limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) ⇒ Object



527
528
529
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 527

def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
  where_sql
end

#native_database_typesObject



142
143
144
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 142

def native_database_types
  NATIVE_DATABASE_TYPES
end

#pk_and_sequence_for(table) ⇒ Object



508
509
510
511
512
513
514
515
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 508

def pk_and_sequence_for(table)
  keys = []
  result = execute("describe #{quote_table_name(table)}")
  result.each(:symbolize_keys => true, :as => :hash) do |row|
    keys << row[:Field] if row[:Key] == "PRI"
  end
  keys.length == 1 ? [keys.first, nil] : nil
end

#primary_key(table) ⇒ Object

Returns just a table’s primary key



518
519
520
521
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 518

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 ==================================================



148
149
150
151
152
153
154
155
156
157
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 148

def quote(value, column = nil)
  if value.kind_of?(String) && column && column.type == :binary && column.class.respond_to?(:string_to_binary)
    s = column.class.string_to_binary(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:



159
160
161
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 159

def quote_column_name(name) #:nodoc:
  @quoted_column_names[name] ||= "`#{name}`"
end

#quote_string(string) ⇒ Object



167
168
169
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 167

def quote_string(string)
  @connection.escape(string)
end

#quote_table_name(name) ⇒ Object

:nodoc:



163
164
165
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 163

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

#quoted_falseObject



175
176
177
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 175

def quoted_false
  QUOTED_FALSE
end

#quoted_trueObject



171
172
173
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 171

def quoted_true
  QUOTED_TRUE
end

#reconnect!Object



199
200
201
202
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 199

def reconnect!
  disconnect!
  connect
end

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



343
344
345
346
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 343

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

#release_savepointObject



312
313
314
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 312

def release_savepoint
  execute("RELEASE SAVEPOINT #{current_savepoint_name}")
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object



467
468
469
470
471
472
473
474
475
476
477
478
479
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 467

def rename_column(table_name, column_name, new_column_name)
  options = {}
  if column = columns(table_name).find { |c| c.name == column_name.to_s }
    options[:default] = column.default
    options[:null] = column.null
  else
    raise ActiveRecordError, "No such column: #{table_name}.#{column_name}"
  end
  current_type = select_one("SHOW COLUMNS FROM #{quote_table_name(table_name)} LIKE '#{column_name}'")["Type"]
  rename_column_sql = "ALTER TABLE #{quote_table_name(table_name)} CHANGE #{quote_column_name(column_name)} #{quote_column_name(new_column_name)} #{current_type}"
  add_column_options!(rename_column_sql, options)
  execute(rename_column_sql)
end

#rename_table(table_name, new_name) ⇒ Object



424
425
426
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 424

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

#requires_reloading?Boolean

this is set to true in 2.3, but we don’t want it to be

Returns:

  • (Boolean)


205
206
207
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 205

def requires_reloading?
  false
end

#reset!Object



216
217
218
219
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 216

def reset!
  disconnect!
  connect
end

#rollback_db_transactionObject



298
299
300
301
302
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 298

def rollback_db_transaction
  execute "ROLLBACK"
rescue Exception
  # Transactions aren't supported
end

#rollback_to_savepointObject



308
309
310
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 308

def rollback_to_savepoint
  execute("ROLLBACK TO SAVEPOINT #{current_savepoint_name}")
end

#select_rows(sql, name = nil) ⇒ Object

Returns an array of arrays containing the field values. Order is the same as that returned by columns.



253
254
255
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 253

def select_rows(sql, name = nil)
  execute(sql, name).to_a
end

#show_variable(name) ⇒ Object



503
504
505
506
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 503

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

#structure_dumpObject

SCHEMA STATEMENTS ========================================



330
331
332
333
334
335
336
337
338
339
340
341
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 330

def structure_dump
  if supports_views?
    sql = "SHOW FULL TABLES WHERE Table_type = 'BASE TABLE'"
  else
    sql = "SHOW TABLES"
  end

  select_all(sql).inject("") do |structure, table|
    table.delete('Table_type')
    structure += select_one("SHOW CREATE TABLE #{quote_table_name(table.to_a.first.last)}")["Create Table"] + ";\n\n"
  end
end

#supports_migrations?Boolean

Returns:

  • (Boolean)


130
131
132
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 130

def supports_migrations?
  true
end

#supports_primary_key?Boolean

Returns:

  • (Boolean)


134
135
136
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 134

def supports_primary_key?
  true
end

#supports_savepoints?Boolean

Returns:

  • (Boolean)


138
139
140
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 138

def supports_savepoints?
  true
end

#tables(name = nil) ⇒ Object



381
382
383
384
385
386
387
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 381

def tables(name = nil)
  tables = []
  execute("SHOW TABLES", name).each do |field|
    tables << field.first
  end
  tables
end

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

Maps logical Rails types to MySQL-specific data types.



482
483
484
485
486
487
488
489
490
491
492
493
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 482

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  return super unless type.to_s == '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
end

#update_sql(sql, name = nil) ⇒ Object



281
282
283
284
# File 'lib/active_record/connection_adapters/mysql2_adapter.rb', line 281

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