Class: ActiveRecord::ConnectionAdapters::MysqlAdapter

Inherits:
AbstractMysqlAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/mysql_adapter.rb

Overview

The MySQL adapter will work with both Ruby/MySQL, which is a Ruby-based MySQL adapter that comes bundled with Active Record, and with the faster C-based MySQL/Ruby adapter (available both as a gem and from www.tmtm.org/en/mysql/ruby/).

Options:

  • :host - Defaults to “localhost”.

  • :port - Defaults to 3306.

  • :socket - Defaults to “/tmp/mysql.sock”.

  • :username - Defaults to “root”

  • :password - Defaults to nothing.

  • :database - The name of the database. No default, must be provided.

  • :encoding - (Optional) Sets the client encoding by executing “SET NAMES <encoding>” after connection.

  • :reconnect - Defaults to false (See MySQL documentation: dev.mysql.com/doc/refman/5.0/en/auto-reconnect.html).

  • :strict - Defaults to true. Enable STRICT_ALL_TABLES. (See MySQL documentation: dev.mysql.com/doc/refman/5.5/en/server-sql-mode.html)

  • :sslca - Necessary to use MySQL with an SSL connection.

  • :sslkey - Necessary to use MySQL with an SSL connection.

  • :sslcert - Necessary to use MySQL with an SSL connection.

  • :sslcapath - Necessary to use MySQL with an SSL connection.

  • :sslcipher - Necessary to use MySQL with an SSL connection.

Defined Under Namespace

Modules: Fields Classes: Column, StatementPool

Constant Summary collapse

ADAPTER_NAME = 
'MySQL'
ENCODINGS =

Taken from here:

https://github.com/tmtm/ruby-mysql/blob/master/lib/mysql/charset.rb

Author: TOMITA Masahiro <[email protected]>

{
  "armscii8" => nil,
  "ascii"    => Encoding::US_ASCII,
  "big5"     => Encoding::Big5,
  "binary"   => Encoding::ASCII_8BIT,
  "cp1250"   => Encoding::Windows_1250,
  "cp1251"   => Encoding::Windows_1251,
  "cp1256"   => Encoding::Windows_1256,
  "cp1257"   => Encoding::Windows_1257,
  "cp850"    => Encoding::CP850,
  "cp852"    => Encoding::CP852,
  "cp866"    => Encoding::IBM866,
  "cp932"    => Encoding::Windows_31J,
  "dec8"     => nil,
  "eucjpms"  => Encoding::EucJP_ms,
  "euckr"    => Encoding::EUC_KR,
  "gb2312"   => Encoding::EUC_CN,
  "gbk"      => Encoding::GBK,
  "geostd8"  => nil,
  "greek"    => Encoding::ISO_8859_7,
  "hebrew"   => Encoding::ISO_8859_8,
  "hp8"      => nil,
  "keybcs2"  => nil,
  "koi8r"    => Encoding::KOI8_R,
  "koi8u"    => Encoding::KOI8_U,
  "latin1"   => Encoding::ISO_8859_1,
  "latin2"   => Encoding::ISO_8859_2,
  "latin5"   => Encoding::ISO_8859_9,
  "latin7"   => Encoding::ISO_8859_13,
  "macce"    => Encoding::MacCentEuro,
  "macroman" => Encoding::MacRoman,
  "sjis"     => Encoding::SHIFT_JIS,
  "swe7"     => nil,
  "tis620"   => Encoding::TIS_620,
  "ucs2"     => Encoding::UTF_16BE,
  "ujis"     => Encoding::EucJP_ms,
  "utf8"     => Encoding::UTF_8,
  "utf8mb4"  => Encoding::UTF_8,
}

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of MysqlAdapter.



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 125

def initialize(connection, logger, connection_options, config)
  super
  @statements = StatementPool.new(@connection,
                                  config.fetch(:statement_limit) { 1000 })
  @client_encoding = nil
  connect
end

Instance Method Details

#active? ⇒ Boolean

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

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 174

def active?
  if @connection.respond_to?(:stat)
    @connection.stat
  else
    @connection.query 'select 1'
  end

  # mysql-ruby doesn't raise an exception when stat fails.
  if @connection.respond_to?(:errno)
    @connection.errno.zero?
  else
    true
  end
rescue Mysql::Error
  false
end

#begin_db_transaction ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 466

def begin_db_transaction #:nodoc:
  exec_query "BEGIN"
rescue Mysql::Error
  # Transactions aren't supported
end

#clear_cache! ⇒ Object

Clears the prepared statements cache.



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 223

def clear_cache!
  @statements.clear
end

#client_encoding ⇒ Object

Get the client encoding for this database



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 271

def client_encoding
  return @client_encoding if @client_encoding

  result = exec_query(
    "SHOW VARIABLES WHERE Variable_name = 'character_set_client'",
    'SCHEMA')
  @client_encoding = ENCODINGS[result.rows.last.last]
end

#disconnect! ⇒ Object

Disconnects from the database if already connected. Otherwise, this method does nothing.



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 199

def disconnect!
  super
  @connection.close rescue nil
end

#each_hash(result) ⇒ Object

HELPER METHODS ===========================================



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

def each_hash(result) # :nodoc:
  if block_given?
    result.each_hash do |row|
      row.symbolize_keys!
      yield row
    end
  else
    to_enum(:each_hash, result)
  end
end

#error_number(exception) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 156

def error_number(exception) # :nodoc:
  exception.errno if exception.respond_to?(:errno)
end

#exec_delete(sql, name, binds) ⇒ Object Also known as: exec_update 



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 455

def exec_delete(sql, name, binds)
  affected_rows = 0

  exec_query(sql, name, binds) do |n|
    affected_rows = n
  end

  affected_rows
end

#exec_query(sql, name = 'SQL', binds = []) {|affected_rows| ... } ⇒ Object

Yields:

  • (affected_rows) 


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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 280

def exec_query(sql, name = 'SQL', binds = [])
  # If the configuration sets prepared_statements:false, binds will
  # always be empty, since the bind variables will have been already
  # substituted and removed from binds by BindVisitor, so this will
  # effectively disable prepared statement usage completely.
  if binds.empty?
    result_set, affected_rows = exec_without_stmt(sql, name)
  else
    result_set, affected_rows = exec_stmt(sql, name, binds)
  end

  yield affected_rows if block_given?

  result_set
end

#exec_without_stmt(sql, name = 'SQL') ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 414

def exec_without_stmt(sql, name = 'SQL') # :nodoc:
  # Some queries, like SHOW CREATE TABLE don't work through the prepared
  # statement API. For those queries, we need to use this method. :'(
  log(sql, name) do
    result = @connection.query(sql)
    affected_rows = @connection.affected_rows

    if result
      types = {}
      result.fetch_fields.each { |field|
        if field.decimals > 0
          types[field.name] = Fields::Decimal.new
        else
          types[field.name] = Fields::TYPES.fetch(field.type) {
            Fields::Identity.new
          }
        end
      }
      result_set = ActiveRecord::Result.new(types.keys, result.to_a, types)
      result.free
    else
      result_set = ActiveRecord::Result.new([], [])
    end

    [result_set, affected_rows]
  end
end

#execute_and_free(sql, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 442

def execute_and_free(sql, name = nil)
  result = execute(sql, name)
  ret = yield result
  result.free
  ret
end

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

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 449

def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
  super sql, name
  id_value || @connection.insert_id
end

#last_inserted_id(result) ⇒ Object 



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 296

def last_inserted_id(result)
  @connection.insert_id
end

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

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 152

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

#quote_string(string) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 168

def quote_string(string) #:nodoc:
  @connection.quote(string)
end

#reconnect! ⇒ Object 



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 191

def reconnect!
  super
  disconnect!
  connect
end

#reset! ⇒ Object 



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 204

def reset!
  if @connection.respond_to?(:change_user)
    # See http://bugs.mysql.com/bug.php?id=33540 -- the workaround way to
    # reset the connection is to change the user to the same user.
    @connection.change_user(@config[:username], @config[:password], @config[:database])
    configure_connection
  end
end

#select_rows(sql, name = nil) ⇒ Object

DATABASE STATEMENTS ======================================



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 215

def select_rows(sql, name = nil)
  @connection.query_with_result = true
  rows = exec_query(sql, name).rows
  @connection.more_results && @connection.next_result    # invoking stored procedures with CLIENT_MULTI_RESULTS requires this to tidy up else connection will be dropped
  rows
end

#supports_statement_cache? ⇒ Boolean

Returns true, since this connection adapter supports prepared statement caching.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 135

def supports_statement_cache?
  true
end

#type_cast(value, column) ⇒ Object

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



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# File 'lib/active_record/connection_adapters/mysql_adapter.rb', line 162

def type_cast(value, column)
  return super unless value == true || value == false

  value ? 1 : 0
end