Class: Innodb::Page::SysDataDictionaryHeader

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

Constant Summary

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, #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 15

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 44

def dump
  super

  puts
  puts "data_dictionary header:"
  pp data_dictionary_header
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 5

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 10

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