Class: ActiveRecord::ConnectionAdapters::SQLServerAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/sql_server_adapter.rb

Instance Method Summary collapse

Instance Method Details

#active_host ⇒ Object 



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# File 'lib/sql_server_adapter.rb', line 55

def active_host
  @active_host ||= @connection_options[:host]
end

#active_host=(host) ⇒ Object 



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# File 'lib/sql_server_adapter.rb', line 51

def active_host=(host)
  @active_host = host
end

#change_active_host ⇒ Object 



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# File 'lib/sql_server_adapter.rb', line 59

def change_active_host
  slave_host = @connection_options[:slaves][0]['host'] if @connection_options[:slaves]
  return unless slave_host
  if using_master?
    self.active_host = slave_host
    # After x minutes, try using the master database again
    @switch_back_next_attempt = Time.now + 5.minute
  else
    self.active_host = @connection_options[:host]
    @switch_back_next_attempt = nil
  end
end

#connect ⇒ Object 



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# File 'lib/sql_server_adapter.rb', line 17

def connect
  config = @connection_options
  # If using host database, try connect to master again after x minutes
  if using_slave? && @switch_back_next_attempt.present? && @switch_back_next_attempt <= Time.now
    change_active_host
  end
  @connection = case config[:mode]
                when :dblib
                  begin
                    # Attempt first connect
                    dblib_connect(config)
                  rescue
                    begin
                      dblib_connect(config)
                    rescue
                      change_active_host
                      dblib_connect(config)
                    end
                  end
                when :odbc
                  odbc_connect(config)
                end
  @spid = _raw_select('SELECT @@SPID', fetch: :rows).first.first
  configure_connection
end

#dblib_connect(config) ⇒ Object 



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# File 'lib/sql_server_adapter.rb', line 72

def dblib_connect(config)
  TinyTds::Client.new(
      dataserver: config[:dataserver],
      host: active_host,
      port: config[:port],
      username: config[:username],
      password: config[:password],
      database: config[:database],
      tds_version: config[:tds_version],
      appname: config_appname(config),
      login_timeout: (config),
      timeout: config_timeout(config),
      encoding:  config_encoding(config),
      azure: config[:azure]
  ).tap do |client|
    if config[:azure]
      client.execute('SET ANSI_NULLS ON').do
      client.execute('SET CURSOR_CLOSE_ON_COMMIT OFF').do
      client.execute('SET ANSI_NULL_DFLT_ON ON').do
      client.execute('SET IMPLICIT_TRANSACTIONS OFF').do
      client.execute('SET ANSI_PADDING ON').do
      client.execute('SET QUOTED_IDENTIFIER ON').do
      client.execute('SET ANSI_WARNINGS ON').do
    else
      client.execute('SET ANSI_DEFAULTS ON').do
      client.execute('SET CURSOR_CLOSE_ON_COMMIT OFF').do
      client.execute('SET IMPLICIT_TRANSACTIONS OFF').do
    end
    client.execute('SET TEXTSIZE 2147483647').do
    client.execute('SET CONCAT_NULL_YIELDS_NULL ON').do
  end
end

#using_master? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sql_server_adapter.rb', line 43

def using_master?
  @active_host == @connection_options[:host]
end

#using_slave? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sql_server_adapter.rb', line 47

def using_slave?
  !using_master?
end