Class: ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter

Inherits:
AbstractAdapter show all
Defined in:
activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

Direct Known Subclasses

Mysql2Adapter, MysqlAdapter

Defined Under Namespace

Classes: BindSubstitution, Column

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) 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 Attribute Summary

Attributes inherited from AbstractAdapter

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

Attributes included from QueryCache

#query_cache, #query_cache_enabled

Instance Method Summary collapse

Methods inherited from AbstractAdapter

#active?, #clear_cache!, #close, #current_savepoint_name, #decrement_open_transactions, #disconnect!, #expire, #increment_open_transactions, #lease, #prefetch_primary_key?, #raw_connection, #reconnect!, #requires_reloading?, #reset!, #substitute_at, #supports_count_distinct?, #supports_ddl_transactions?, #supports_explain?, #transaction_joinable=, #verify!

Methods included from ActiveSupport::Callbacks

#run_callbacks

Methods included from ActiveSupport::Concern

#append_features, extended, #included

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

#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, #quoted_date, #type_cast

Methods included from DatabaseStatements

#add_transaction_record, #case_sensitive_equality_operator, #default_sequence_name, #delete, #empty_insert_statement_value, #exec_delete, #exec_insert, #exec_query, #exec_update, #insert, #insert_fixture, #outside_transaction?, #reset_sequence!, #sanitize_limit, #select_all, #select_one, #select_rows, #select_value, #select_values, #supports_statement_cache?, #to_sql, #transaction, #update

Methods included from SchemaStatements

#add_column_options!, #add_index, #add_timestamps, #assume_migrated_upto_version, #change_table, #column_exists?, #distinct, #drop_table, #dump_schema_information, #index_exists?, #index_name, #index_name_exists?, #initialize_schema_migrations_table, #remove_column, #remove_index, #remove_index!, #remove_timestamps, #rename_index, #table_alias_for

Constructor Details

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

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


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

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

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

Instance Method Details

#adapter_nameObject

:nodoc:


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

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

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


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

def add_column(table_name, column_name, type, options = {})
  execute("ALTER TABLE #{quote_table_name(table_name)} #{add_column_sql(table_name, column_name, type, options)}")
end

#add_column_position!(sql, options) ⇒ Object


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 512

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

#begin_db_transactionObject


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 267

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

#bulk_change_table(table_name, operations) ⇒ Object

:nodoc:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 437

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


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 549

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


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 545

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

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

:nodoc:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 479

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


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 464

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


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 469

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.


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

def charset
  show_variable 'character_set_database'
end

#collationObject

Returns the database collation strategy.


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

def collation
  show_variable 'collation_database'
end

#columns(table_name, name = nil) ⇒ Object

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


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 424

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

#commit_db_transactionObject

:nodoc:


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

def commit_db_transaction #:nodoc:
  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

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

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


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 285

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

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

:nodoc:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 433

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

#current_databaseObject


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

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

#disable_referential_integrity(&block) ⇒ Object

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


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

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

#drop_database(name) ⇒ Object

Drops a MySQL database.

Example:

drop_database('sebastian_development')

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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 360

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

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

def each_hash(result) # :nodoc:
  raise NotImplementedError
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

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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 102

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)

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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 192

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

#execute(sql, name = nil) ⇒ Object

Executes the SQL statement in the context of this connection.


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 241

def execute(sql, name = nil)
  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

#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 a abstract way without concerning ourselves about whether it needs to be explicitly freed or not.

Yields:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 258

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

#indexes(table_name, name = nil) ⇒ Object

Returns an array of indexes for the given table.


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 404

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]
        indexes << IndexDefinition.new(row[:Table], row[:Key_name], row[:Non_unique].to_i == 0, [], [])
      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. However, MySQL is too stupid to create a temporary table for this automatically, so we have to give it some prompting in the form of a subsubquery. Ugh!


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

def join_to_update(update, select) #:nodoc:
  if select.limit || select.offset || select.orders.any?
    subsubselect = select.clone
    subsubselect.projections = [update.key]

    subselect = Arel::SelectManager.new(select.engine)
    subselect.project Arel.sql(update.key.name)
    subselect.from subsubselect.as('__active_record_temp')

    update.where update.key.in(subselect)
  else
    update.table select.source
    update.wheres = select.constraints
  end
end

#limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) ⇒ Object


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 557

def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
  where_sql
end

#native_database_typesObject


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 173

def native_database_types
  NATIVE_DATABASE_TYPES
end

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

Overridden by the adapters to instantiate their specific Column type.


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 186

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

#pk_and_sequence_for(table) ⇒ Object

Returns a table's primary key and belonging sequence.


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 527

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.gsub(/[`"]/, "") }
      keys.length == 1 ? [keys.first, nil] : nil
    else
      nil
    end
  end
end

#primary_key(table) ⇒ Object

Returns just a table's primary key


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

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


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

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:


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

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

#quote_table_name(name) ⇒ Object

:nodoc:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 213

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

#quoted_falseObject


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

def quoted_false
  QUOTED_FALSE
end

#quoted_trueObject


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 217

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.


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

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

#release_savepointObject


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 293

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

#rename_column(table_name, column_name, new_column_name) ⇒ Object

:nodoc:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 483

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)}")
end

#rename_table(table_name, new_name) ⇒ Object

Renames a table.

Example:

rename_table('octopuses', 'octopi')

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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 456

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

#rollback_db_transactionObject

:nodoc:


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

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

#rollback_to_savepointObject


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

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

#show_variable(name) ⇒ Object

SHOW VARIABLES LIKE 'name'


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 521

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

#structure_dumpObject

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


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

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

  select_all(sql).map { |table|
    table.delete('Table_type')
    sql = "SHOW CREATE TABLE #{quote_table_name(table.to_a.first.last)}"
    exec_query(sql).first['Create Table'] + ";\n\n"
  }.join
end

#supports_bulk_alter?Boolean

:nodoc:

Returns:

  • (Boolean)

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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 163

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)

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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 169

def supports_index_sort_order?
  true
end

#supports_migrations?Boolean

Returns true, since this connection adapter supports migrations.

Returns:

  • (Boolean)

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

def supports_migrations?
  true
end

#supports_primary_key?Boolean

Returns:

  • (Boolean)

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

def supports_primary_key?
  true
end

#supports_savepoints?Boolean

Returns true, since this connection adapter supports savepoints.

Returns:

  • (Boolean)

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

def supports_savepoints?
  true
end

#table_exists?(name) ⇒ Boolean

Returns:

  • (Boolean)

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

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:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 378

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_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object

Maps logical Rails types to MySQL-specific data types.


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

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_s
  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:


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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 262

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