Class: Innodb::Record
- Inherits:
-
Object
- Object
- Innodb::Record
- Defined in:
- lib/innodb/record.rb
Instance Attribute Summary collapse
-
#page ⇒ Object
readonly
Returns the value of attribute page.
-
#record ⇒ Object
Returns the value of attribute record.
Instance Method Summary collapse
- #child_page_number ⇒ Object
-
#compare_key(other_key) ⇒ Object
Compare two arrays of fields to determine if they are equal.
- #deleted? ⇒ Boolean
- #dump ⇒ Object
- #each_undo_record ⇒ Object
- #fields ⇒ Object
- #header ⇒ Object
- #heap_number ⇒ Object
-
#initialize(page, record) ⇒ Record
constructor
A new instance of Record.
- #key ⇒ Object
- #key_string ⇒ Object
- #length ⇒ Object
- #min_rec? ⇒ Boolean
- #n_owned ⇒ Object
- #next ⇒ Object
- #offset ⇒ Object
- #roll_pointer ⇒ Object
- #row ⇒ Object
- #row_string ⇒ Object
- #string ⇒ Object
- #transaction_id ⇒ Object
- #type ⇒ Object
- #uncached_fields ⇒ Object
- #undo ⇒ Object
Constructor Details
#initialize(page, record) ⇒ Record
Returns a new instance of Record.
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# File 'lib/innodb/record.rb', line 7 def initialize(page, record) @page = page @record = record end |
Instance Attribute Details
#page ⇒ Object (readonly)
Returns the value of attribute page.
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# File 'lib/innodb/record.rb', line 4 def page @page end |
#record ⇒ Object
Returns the value of attribute record.
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# File 'lib/innodb/record.rb', line 5 def record @record end |
Instance Method Details
#child_page_number ⇒ Object
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# File 'lib/innodb/record.rb', line 103 def child_page_number record[:child_page_number] end |
#compare_key(other_key) ⇒ Object
Compare two arrays of fields to determine if they are equal. This follows the same comparison rules as strcmp and others:
0 = a is equal to b
-1 = a is less than b
+1 = a is greater than b
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# File 'lib/innodb/record.rb', line 136 def compare_key(other_key) Innodb::Stats.increment :compare_key return 0 if other_key.nil? && key.nil? return -1 if other_key.nil? || (!key.nil? && other_key.size < key.size) return +1 if key.nil? || (!other_key.nil? && other_key.size > key.size) key.each_index do |i| Innodb::Stats.increment :compare_key_field_comparison return -1 if other_key[i] < key[i][:value] return +1 if other_key[i] > key[i][:value] end return 0 end |
#deleted? ⇒ Boolean
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# File 'lib/innodb/record.rb', line 32 def deleted? header[:deleted] end |
#dump ⇒ Object
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# File 'lib/innodb/record.rb', line 152 def dump puts "Record at offset %i" % offset puts puts "Header:" puts " %-20s: %i" % ["Next record offset", header[:next]] puts " %-20s: %i" % ["Heap number", header[:heap_number]] puts " %-20s: %s" % ["Type", header[:type]] puts " %-20s: %s" % ["Deleted", header[:deleted]] puts " %-20s: %s" % ["Length", header[:length]] puts if page.leaf? puts "System fields:" puts " Transaction ID: %s" % transaction_id puts " Roll Pointer:" puts " Undo Log: page %i, offset %i" % [ roll_pointer[:undo_log][:page], roll_pointer[:undo_log][:offset], ] puts " Rollback Segment ID: %i" % roll_pointer[:rseg_id] puts " Insert: %s" % roll_pointer[:is_insert] puts end puts "Key fields:" key.each do |field| puts " %s: %s" % [ field[:name], field[:value].inspect, ] end puts if page.leaf? puts "Non-key fields:" row.each do |field| puts " %s: %s" % [ field[:name], field[:value].inspect, ] end puts else puts "Child page number: %i" % child_page_number puts end end |
#each_undo_record ⇒ Object
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# File 'lib/innodb/record.rb', line 89 def each_undo_record unless block_given? return enum_for(:each_undo_record) end undo_record = undo while undo_record yield undo_record undo_record = undo_record.prev_by_history end nil end |
#fields ⇒ Object
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# File 'lib/innodb/record.rb', line 127 def fields @fields ||= uncached_fields end |
#header ⇒ Object
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# File 'lib/innodb/record.rb', line 12 def header record[:header] end |
#heap_number ⇒ Object
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# File 'lib/innodb/record.rb', line 24 def heap_number header[:heap_number] end |
#key ⇒ Object
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# File 'lib/innodb/record.rb', line 52 def key record[:key] end |
#key_string ⇒ Object
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# File 'lib/innodb/record.rb', line 56 def key_string key && key.map { |r| "%s=%s" % [r[:name], r[:value].inspect] }.join(", ") end |
#length ⇒ Object
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# File 'lib/innodb/record.rb', line 44 def length record[:length] end |
#min_rec? ⇒ Boolean
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# File 'lib/innodb/record.rb', line 36 def min_rec? header[:min_rec] end |
#n_owned ⇒ Object
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# File 'lib/innodb/record.rb', line 28 def n_owned header[:n_owned] end |
#next ⇒ Object
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# File 'lib/innodb/record.rb', line 16 def next header[:next] end |
#offset ⇒ Object
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# File 'lib/innodb/record.rb', line 40 def offset record[:offset] end |
#roll_pointer ⇒ Object
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# File 'lib/innodb/record.rb', line 72 def roll_pointer record[:roll_pointer] end |
#row ⇒ Object
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# File 'lib/innodb/record.rb', line 60 def row record[:row] end |
#row_string ⇒ Object
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# File 'lib/innodb/record.rb', line 64 def row_string row && row.map { |r| "%s=%s" % [r[:name], r[:value].inspect] }.join(", ") end |
#string ⇒ Object
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# File 'lib/innodb/record.rb', line 107 def string if child_page_number "(%s) → #%s" % [key_string, child_page_number] else "(%s) → (%s)" % [key_string, row_string] end end |
#transaction_id ⇒ Object
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# File 'lib/innodb/record.rb', line 68 def transaction_id record[:transaction_id] end |
#type ⇒ Object
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# File 'lib/innodb/record.rb', line 20 def type header[:type] end |
#uncached_fields ⇒ Object
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# File 'lib/innodb/record.rb', line 115 def uncached_fields fields_hash = {} [:key, :row].each do |group| if record[group] record[group].each do |column| fields_hash[column[:name]] = column[:value] end end end fields_hash end |
#undo ⇒ Object
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# File 'lib/innodb/record.rb', line 76 def undo return nil unless roll_pointer if innodb_system = @page.space.innodb_system undo_space = innodb_system.system_space if undo_page = undo_space.page(roll_pointer[:undo_log][:page]) new_undo_record = Innodb::UndoRecord.new(undo_page, roll_pointer[:undo_log][:offset]) new_undo_record.index_page = page new_undo_record end end end |