Class: Innodb::Record

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(page, record) ⇒ Record

Returns a new instance of Record.



7
8
9
10
 
# 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.



4
5
6
 
# File 'lib/innodb/record.rb', line 4

def page
  @page
end

#record ⇒ Object

Returns the value of attribute record.



5
6
7
 
# File 'lib/innodb/record.rb', line 5

def record
  @record
end

Instance Method Details

#child_page_number ⇒ Object 



99
100
101
 
# File 'lib/innodb/record.rb', line 99

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



132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
 
# File 'lib/innodb/record.rb', line 132

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

Returns:

  • (Boolean) 


28
29
30
 
# File 'lib/innodb/record.rb', line 28

def deleted?
  header[:deleted]
end

#dump ⇒ Object 



148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
 
# File 'lib/innodb/record.rb', line 148

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 



85
86
87
88
89
90
91
92
93
94
95
96
97
 
# File 'lib/innodb/record.rb', line 85

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 



123
124
125
 
# File 'lib/innodb/record.rb', line 123

def fields
  @fields ||= uncached_fields
end

#header ⇒ Object 



12
13
14
 
# File 'lib/innodb/record.rb', line 12

def header
  record[:header]
end

#heap_number ⇒ Object 



20
21
22
 
# File 'lib/innodb/record.rb', line 20

def heap_number
  header[:heap_number]
end

#key ⇒ Object 



48
49
50
 
# File 'lib/innodb/record.rb', line 48

def key
  record[:key]
end

#key_string ⇒ Object 



52
53
54
 
# File 'lib/innodb/record.rb', line 52

def key_string
  key && key.map { |r| "%s=%s" % [r[:name], r[:value].inspect] }.join(", ")
end

#length ⇒ Object 



40
41
42
 
# File 'lib/innodb/record.rb', line 40

def length
  record[:length]
end

#min_rec? ⇒ Boolean

Returns:

  • (Boolean) 


32
33
34
 
# File 'lib/innodb/record.rb', line 32

def min_rec?
  header[:min_rec]
end

#n_owned ⇒ Object 



24
25
26
 
# File 'lib/innodb/record.rb', line 24

def n_owned
  header[:n_owned]
end

#next ⇒ Object 



44
45
46
 
# File 'lib/innodb/record.rb', line 44

def next
  record[:next]
end

#offset ⇒ Object 



36
37
38
 
# File 'lib/innodb/record.rb', line 36

def offset
  record[:offset]
end

#roll_pointer ⇒ Object 



68
69
70
 
# File 'lib/innodb/record.rb', line 68

def roll_pointer
  record[:roll_pointer]
end

#row ⇒ Object 



56
57
58
 
# File 'lib/innodb/record.rb', line 56

def row
  record[:row]
end

#row_string ⇒ Object 



60
61
62
 
# File 'lib/innodb/record.rb', line 60

def row_string
  row && row.map { |r| "%s=%s" % [r[:name], r[:value].inspect] }.join(", ")
end

#string ⇒ Object 



103
104
105
106
107
108
109
 
# File 'lib/innodb/record.rb', line 103

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 



64
65
66
 
# File 'lib/innodb/record.rb', line 64

def transaction_id
  record[:transaction_id]
end

#type ⇒ Object 



16
17
18
 
# File 'lib/innodb/record.rb', line 16

def type
  header[:type]
end

#uncached_fields ⇒ Object 



111
112
113
114
115
116
117
118
119
120
121
 
# File 'lib/innodb/record.rb', line 111

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 



72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/innodb/record.rb', line 72

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