Class: Innodb::Page::SysDataDictionaryHeader

Inherits:
Innodb::Page show all
Defined in:
lib/innodb/page/sys_data_dictionary_header.rb

Constant Summary collapse

RECORD_DESCRIBERS = 
{
  :SYS_TABLES  => {
    :PRIMARY => Innodb::DataDictionary::SYS_TABLES_PRIMARY,
    :ID => Innodb::DataDictionary::SYS_TABLES_ID
  },
  :SYS_COLUMNS => { :PRIMARY => Innodb::DataDictionary::SYS_COLUMNS_PRIMARY },
  :SYS_INDEXES => { :PRIMARY => Innodb::DataDictionary::SYS_INDEXES_PRIMARY },
  :SYS_FIELDS  => { :PRIMARY => Innodb::DataDictionary::SYS_FIELDS_PRIMARY },
}

Constants inherited from Innodb::Page

PAGE_TYPE, PAGE_TYPE_BY_VALUE, SPECIALIZED_CLASSES

Instance Attribute Summary

Attributes inherited from Innodb::Page

#space

Instance Method Summary collapse

Methods inherited from Innodb::Page

#calculate_checksum, #checksum, #corrupt?, #cursor, #data, #fil_header, handle, #initialize, #inspect, #lsn, maybe_undefined, #next, #offset, parse, #pos_fil_header, #pos_fil_trailer, #pos_page_body, #prev, #size, #size_fil_header, #size_fil_trailer, #type

Constructor Details

This class inherits a constructor from Innodb::Page

Instance Method Details

#data_dictionary_header ⇒ Object

Parse the data dictionary header from the page.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 27

def data_dictionary_header
  cursor(pos_data_dictionary_header).name("data_dictionary_header") do |c|
    {
      :max_row_id => c.name("max_row_id") { c.get_uint64 },
      :max_table_id => c.name("max_table_id") { c.get_uint64 },
      :max_index_id => c.name("max_index_id") { c.get_uint64 },
      :max_space_id => c.name("max_space_id") { c.get_uint32 },
      :unused_mix_id_low => c.name("unused_mix_id_low") { c.get_uint32 },
      :indexes => c.name("indexes") {{
        :SYS_TABLES => c.name("SYS_TABLES") {{
          :PRIMARY => c.name("PRIMARY") { c.get_uint32 },
          :ID      => c.name("ID")      { c.get_uint32 }, 
        }},
        :SYS_COLUMNS => c.name("SYS_COLUMNS") {{
          :PRIMARY => c.name("PRIMARY") { c.get_uint32 },
        }},
        :SYS_INDEXES => c.name("SYS_INDEXES") {{
          :PRIMARY => c.name("PRIMARY") { c.get_uint32 },
        }},
        :SYS_FIELDS => c.name("SYS_FIELDS") {{
          :PRIMARY => c.name("PRIMARY") { c.get_uint32 },
        }}
      }},
      :unused_space => c.name("unused_space") { c.get_bytes(4) },
      :fseg => c.name("fseg") { Innodb::FsegEntry.get_inode(@space, c) },
    }
  end
end

#dump ⇒ Object 



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 86

def dump
  super

  puts
  puts "data_dictionary header:"
  pp data_dictionary_header
end

#each_index ⇒ Object

Iterate through all indexes in the data dictionary, yielding the table name, index name, and the index itself as an Innodb::Index.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 74

def each_index
  unless block_given?
    return enum_for(:each_index)
  end

  data_dictionary_header[:indexes].each do |table_name, indexes|
    indexes.each do |index_name, root_page_number|
      yield table_name, index_name, index(table_name, index_name)
    end
  end
end

#index(table_name, index_name) ⇒ Object 



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 56

def index(table_name, index_name)
  unless table_entry = data_dictionary_header[:indexes][table_name]
    raise "Unknown data dictionary table #{table_name}"
  end

  unless index_root_page = table_entry[index_name]
    raise "Unknown data dictionary index #{table_name}.#{index_name}"
  end

  # If we have a record describer for this index, load it.
  record_describer = RECORD_DESCRIBERS[table_name] &&
                     RECORD_DESCRIBERS[table_name][index_name]

  @space.index(index_root_page, record_describer.new)
end

#pos_data_dictionary_header ⇒ Object

The position of the data dictionary header within the page.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 17

def pos_data_dictionary_header
  pos_fil_header + size_fil_header
end

#size_data_dictionary_header ⇒ Object

The size of the data dictionary header.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 22

def size_data_dictionary_header
  ((8 * 3) + (4 * 7) + 4 + Innodb::FsegEntry::SIZE)
end