Class: Innodb::DataDictionary

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

Defined Under Namespace

Classes: MysqlType, SysColumnsPrimary, SysFieldsPrimary, SysIndexesPrimary, SysTablesId, SysTablesPrimary

Constant Summary collapse

DATA_DICTIONARY_RECORD_DESCRIBERS =

A hash of hashes of table name and index name to describer class.

{
  SYS_TABLES: {
    PRIMARY: SysTablesPrimary,
    ID: SysTablesId,
  }.freeze,
  SYS_COLUMNS: { PRIMARY: SysColumnsPrimary }.freeze,
  SYS_INDEXES: { PRIMARY: SysIndexesPrimary }.freeze,
  SYS_FIELDS: { PRIMARY: SysFieldsPrimary }.freeze,
}.freeze
MYSQL_TYPE =

A hash of MySQL’s internal type system to the stored values for those types, and the ‘external’ SQL type. rubocop:disable Layout/HashAlignment rubocop:disable Layout/CommentIndentation

{
# DECIMAL:      MysqlType.new(value: 0,   type: :DECIMAL),
  TINY:         MysqlType.new(value: 1,   type: :TINYINT),
  SHORT:        MysqlType.new(value: 2,   type: :SMALLINT),
  LONG:         MysqlType.new(value: 3,   type: :INT),
  FLOAT:        MysqlType.new(value: 4,   type: :FLOAT),
  DOUBLE:       MysqlType.new(value: 5,   type: :DOUBLE),
# NULL:         MysqlType.new(value: 6,   type: nil),
  TIMESTAMP:    MysqlType.new(value: 7,   type: :TIMESTAMP),
  LONGLONG:     MysqlType.new(value: 8,   type: :BIGINT),
  INT24:        MysqlType.new(value: 9,   type: :MEDIUMINT),
# DATE:         MysqlType.new(value: 10,  type: :DATE),
  TIME:         MysqlType.new(value: 11,  type: :TIME),
  DATETIME:     MysqlType.new(value: 12,  type: :DATETIME),
  YEAR:         MysqlType.new(value: 13,  type: :YEAR),
  NEWDATE:      MysqlType.new(value: 14,  type: :DATE),
  VARCHAR:      MysqlType.new(value: 15,  type: :VARCHAR),
  BIT:          MysqlType.new(value: 16,  type: :BIT),
  NEWDECIMAL:   MysqlType.new(value: 246, type: :CHAR),
# ENUM:         MysqlType.new(value: 247, type: :ENUM),
# SET:          MysqlType.new(value: 248, type: :SET),
  TINY_BLOB:    MysqlType.new(value: 249, type: :TINYBLOB),
  MEDIUM_BLOB:  MysqlType.new(value: 250, type: :MEDIUMBLOB),
  LONG_BLOB:    MysqlType.new(value: 251, type: :LONGBLOB),
  BLOB:         MysqlType.new(value: 252, type: :BLOB),
# VAR_STRING:   MysqlType.new(value: 253, type: :VARCHAR),
  STRING:       MysqlType.new(value: 254, type: :CHAR),
  GEOMETRY:     MysqlType.new(value: 255, type: :GEOMETRY),
}.freeze
MYSQL_TYPE_BY_VALUE =

A hash of MYSQL_TYPE keys by value :value key.

MYSQL_TYPE.transform_values(&:value).invert.freeze
COLUMN_MTYPE =

A hash of InnoDB’s internal type system to the values stored for each type.

{
  VARCHAR: 1,
  CHAR: 2,
  FIXBINARY: 3,
  BINARY: 4,
  BLOB: 5,
  INT: 6,
  SYS_CHILD: 7,
  SYS: 8,
  FLOAT: 9,
  DOUBLE: 10,
  DECIMAL: 11,
  VARMYSQL: 12,
  MYSQL: 13,
}.freeze
COLUMN_MTYPE_BY_VALUE =

A hash of COLUMN_MTYPE keys by value.

COLUMN_MTYPE.invert.freeze
COLUMN_PRTYPE_FLAG =

A hash of InnoDB ‘precise type’ bitwise flags.

{
  NOT_NULL: 256,
  UNSIGNED: 512,
  BINARY: 1024,
  LONG_TRUE_VARCHAR: 4096,
}.freeze
COLUMN_PRTYPE_FLAG_BY_VALUE =

A hash of COLUMN_PRTYPE keys by value.

COLUMN_PRTYPE_FLAG.invert.freeze
COLUMN_PRTYPE_MYSQL_TYPE_MASK =

The bitmask to extract the MySQL internal type from the InnoDB ‘precise type’.

0xFF
INDEX_TYPE_FLAG =

A hash of InnoDB’s index type flags.

{
  CLUSTERED: 1,
  UNIQUE: 2,
  UNIVERSAL: 4,
  IBUF: 8,
  CORRUPT: 16,
  FTS: 32,
}.freeze
INDEX_TYPE_FLAG_BY_VALUE =

A hash of INDEX_TYPE_FLAG keys by value.

INDEX_TYPE_FLAG.invert.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(system_space) ⇒ DataDictionary

Returns a new instance of DataDictionary.



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# File 'lib/innodb/data_dictionary.rb', line 227

def initialize(system_space)
  @system_space = system_space
end

Instance Attribute Details

#system_space ⇒ Object (readonly)

Returns the value of attribute system_space.



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# File 'lib/innodb/data_dictionary.rb', line 225

def system_space
  @system_space
end

Class Method Details

.mtype_prtype_to_data_type(mtype, prtype, len, prec) ⇒ Object

Return a full data type given an mtype and prtype, such as [‘VARCHAR(10)’, :NOT_NULL] or [:INT, :UNSIGNED].



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# File 'lib/innodb/data_dictionary.rb', line 214

def self.mtype_prtype_to_data_type(mtype, prtype, len, prec)
  type = mtype_prtype_to_type_string(mtype, prtype, len, prec)
  raise "Unsupported type (mtype #{mtype}, prtype #{prtype})" unless type

  data_type = [type]
  data_type << :NOT_NULL if prtype & COLUMN_PRTYPE_FLAG[:NOT_NULL] != 0
  data_type << :UNSIGNED if prtype & COLUMN_PRTYPE_FLAG[:UNSIGNED] != 0

  data_type
end

.mtype_prtype_to_type_string(mtype, prtype, len, prec) ⇒ Object

Return the ‘external’ SQL type string (such as ‘VARCHAR’ or ‘INT’) given the stored mtype and prtype from the InnoDB data dictionary. Note that not all types are extractable into fully defined SQL types due to the lossy nature of the MySQL-to-InnoDB interface regarding types.



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# File 'lib/innodb/data_dictionary.rb', line 174

def self.mtype_prtype_to_type_string(mtype, prtype, len, prec)
  mysql_type = prtype & COLUMN_PRTYPE_MYSQL_TYPE_MASK
  internal_type = MYSQL_TYPE_BY_VALUE[mysql_type]
  external_type = MYSQL_TYPE[internal_type].type

  case external_type
  when :VARCHAR
    # One-argument: length.
    "%s(%i)" % [external_type, len]
  when :FLOAT, :DOUBLE
    # Two-argument: length and precision.
    "%s(%i,%i)" % [external_type, len, prec]
  when :CHAR
    if COLUMN_MTYPE_BY_VALUE[mtype] == :MYSQL
      # When the mtype is :MYSQL, the column is actually
      # stored as VARCHAR despite being a CHAR. This is
      # done for CHAR columns having multi-byte character
      # sets in order to limit size. Note that such data
      # are still space-padded to at least len.
      "VARCHAR(%i)" % [len]
    else
      "CHAR(%i)" % [len]
    end
  when :DECIMAL
    # The DECIMAL type is designated as DECIMAL(M,D)
    # however the M and D definitions are not stored
    # in the InnoDB data dictionary. We need to define
    # the column as something which will extract the
    # raw bytes in order to read the column, but we
    # can't figure out the right decimal type. The
    # len stored here is actually the on-disk storage
    # size.
    "CHAR(%i)" % [len]
  else
    external_type
  end
end

Instance Method Details

#_make_column_description(type, record) ⇒ Object

Produce a Innodb::RecordDescriber-compatible column description given a type (:key, :row) and data dictionary SYS_COLUMNS record.



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# File 'lib/innodb/data_dictionary.rb', line 548

def _make_column_description(type, record)
  {
    type: type,
    name: record["NAME"],
    description: self.class.mtype_prtype_to_data_type(
      record["MTYPE"],
      record["PRTYPE"],
      record["LEN"],
      record["PREC"]
    ),
  }
end

#clustered_index_name_by_table_name(table_name) ⇒ Object

Return the name of the clustered index (usually ‘PRIMARY’, but not always) for a given table name.



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# File 'lib/innodb/data_dictionary.rb', line 538

def clustered_index_name_by_table_name(table_name)
  table_record = table_by_name(table_name)
  raise "Table #{table_name} not found" unless table_record

  index_record = object_by_two_fields(:each_index, "TABLE_ID", table_record["ID"], "TYPE", 3)
  index_record["NAME"] if index_record
end

#column_by_name(table_name, column_name) ⇒ Object

Lookup a column by table name and column name.



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# File 'lib/innodb/data_dictionary.rb', line 410

def column_by_name(table_name, column_name)
  table = table_by_name(table_name)
  return unless table

  object_by_two_fields(:each_column, "TABLE_ID", table["ID"], "NAME", column_name)
end

#data_dictionary_index(table_name, index_name) ⇒ Object

Return an Innodb::Index object initialized to the internal data dictionary index with an appropriate record describer so that records can be recursed.



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# File 'lib/innodb/data_dictionary.rb', line 284

def data_dictionary_index(table_name, index_name)
  raise "Data Dictionary not found; is the MySQL version supported?" unless found?

  table_entry = data_dictionary_indexes[table_name]
  raise "Unknown data dictionary table #{table_name}" unless table_entry

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

  # If we have a record describer for this index, load it.
  record_describer = data_dictionary_index_describer(table_name, index_name)

  system_space.index(index_root_page, record_describer)
end

#data_dictionary_index?(table_name, index_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/innodb/data_dictionary.rb', line 269

def data_dictionary_index?(table_name, index_name)
  return false unless data_dictionary_table?(table_name)

  DATA_DICTIONARY_RECORD_DESCRIBERS[table_name.to_sym].include?(index_name.to_sym)
end

#data_dictionary_index_describer(table_name, index_name) ⇒ Object 



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# File 'lib/innodb/data_dictionary.rb', line 275

def data_dictionary_index_describer(table_name, index_name)
  return unless data_dictionary_index?(table_name, index_name)

  DATA_DICTIONARY_RECORD_DESCRIBERS[table_name.to_sym][index_name.to_sym].new
end

#data_dictionary_index_ids ⇒ Object 



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# File 'lib/innodb/data_dictionary.rb', line 243

def data_dictionary_index_ids
  raise "Data Dictionary not found; is the MySQL version supported?" unless found?

  return @data_dictionary_index_ids if @data_dictionary_index_ids

  # TODO: This could probably be done a lot more Ruby-like.
  @data_dictionary_index_ids = {}
  data_dictionary_indexes.each do |table, indexes|
    indexes.each do |index, root_page_number|
      root_page = system_space.page(root_page_number)
      next unless root_page

      @data_dictionary_index_ids[root_page.index_id] = {
        table: table,
        index: index,
      }
    end
  end

  @data_dictionary_index_ids
end

#data_dictionary_indexes ⇒ Object

A helper method to reach inside the system space and retrieve the data dictionary index locations from the data dictionary header.



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# File 'lib/innodb/data_dictionary.rb', line 234

def data_dictionary_indexes
  system_space.data_dictionary_page.data_dictionary_header[:indexes]
end

#data_dictionary_table?(table_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/innodb/data_dictionary.rb', line 265

def data_dictionary_table?(table_name)
  DATA_DICTIONARY_RECORD_DESCRIBERS.include?(table_name.to_sym)
end

#each_column ⇒ Object

Iterate through the records in the SYS_COLUMNS data dictionary table.



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# File 'lib/innodb/data_dictionary.rb', line 350

def each_column
  return enum_for(:each_column) unless block_given?

  each_record_from_data_dictionary_index(:SYS_COLUMNS, :PRIMARY) do |record|
    yield record.fields
  end

  nil
end

#each_column_by_table_id(table_id) ⇒ Object

Iterate through all columns in a table by table ID.



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# File 'lib/innodb/data_dictionary.rb', line 488

def each_column_by_table_id(table_id)
  return enum_for(:each_column_by_table_id, table_id) unless block_given?

  each_column do |record|
    yield record if record["TABLE_ID"] == table_id
  end

  nil
end

#each_column_by_table_name(table_name, &block) ⇒ Object

Iterate through all columns in a table by table name.



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# File 'lib/innodb/data_dictionary.rb', line 499

def each_column_by_table_name(table_name, &block)
  return enum_for(:each_column_by_table_name, table_name) unless block_given?
  raise "Table #{table_name} not found" unless (table = table_by_name(table_name))

  each_column_by_table_id(table["ID"], &block)

  nil
end

#each_column_description_by_index_name(table_name, index_name) ⇒ Object

Iterate through Innodb::RecordDescriber-compatible column descriptions for a given index by table name and index name.



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# File 'lib/innodb/data_dictionary.rb', line 563

def each_column_description_by_index_name(table_name, index_name)
  return enum_for(:each_column_description_by_index_name, table_name, index_name) unless block_given?

  unless (index = index_by_name(table_name, index_name))
    raise "Index #{index_name} for table #{table_name} not found"
  end

  columns_in_index = {}
  each_column_in_index_by_name(table_name, index_name) do |record|
    columns_in_index[record["NAME"]] = 1
    yield _make_column_description(:key, record)
  end

  if (index["TYPE"] & INDEX_TYPE_FLAG[:CLUSTERED]).zero?
    clustered_index_name = clustered_index_name_by_table_name(table_name)

    each_column_in_index_by_name(table_name, clustered_index_name) do |record|
      yield _make_column_description(:row, record)
    end
  else
    each_column_by_table_name(table_name) do |record|
      yield _make_column_description(:row, record) unless columns_in_index.include?(record["NAME"])
    end
  end

  nil
end

#each_column_in_index_by_name(table_name, index_name) ⇒ Object

Iterate through all columns in an index by table name and index name.



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# File 'lib/innodb/data_dictionary.rb', line 509

def each_column_in_index_by_name(table_name, index_name)
  return enum_for(:each_column_in_index_by_name, table_name, index_name) unless block_given?

  each_field_by_index_name(table_name, index_name) do |record|
    yield column_by_name(table_name, record["COL_NAME"])
  end

  nil
end

#each_column_not_in_index_by_name(table_name, index_name) ⇒ Object

Iterate through all columns not in an index by table name and index name. This is useful when building index descriptions for secondary indexes.



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# File 'lib/innodb/data_dictionary.rb', line 521

def each_column_not_in_index_by_name(table_name, index_name)
  return enum_for(:each_column_not_in_index_by_name, table_name, index_name) unless block_given?

  columns_in_index = {}
  each_column_in_index_by_name(table_name, index_name) do |record|
    columns_in_index[record["NAME"]] = 1
  end

  each_column_by_table_name(table_name) do |record|
    yield record unless columns_in_index.include?(record["NAME"])
  end

  nil
end

#each_data_dictionary_index ⇒ Object

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



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# File 'lib/innodb/data_dictionary.rb', line 315

def each_data_dictionary_index
  return enum_for(:each_data_dictionary_index) unless block_given?

  data_dictionary_indexes.each do |table_name, indexes|
    indexes.each_key do |index_name|
      yield table_name, index_name,
        data_dictionary_index(table_name, index_name)
    end
  end

  nil
end

#each_data_dictionary_index_root_page_number ⇒ Object

Iterate through all data dictionary indexes, yielding the table name, index name, and root page number.



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# File 'lib/innodb/data_dictionary.rb', line 301

def each_data_dictionary_index_root_page_number
  return enum_for(:each_data_dictionary_index_root_page_number) unless block_given?

  data_dictionary_indexes.each do |table_name, indexes|
    indexes.each do |index_name, root_page_number|
      yield table_name, index_name, root_page_number
    end
  end

  nil
end

#each_field ⇒ Object

Iterate through the records in the SYS_FIELDS data dictionary table.



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# File 'lib/innodb/data_dictionary.rb', line 372

def each_field
  return enum_for(:each_field) unless block_given?

  each_record_from_data_dictionary_index(:SYS_FIELDS, :PRIMARY) do |record|
    yield record.fields
  end

  nil
end

#each_field_by_index_id(index_id) ⇒ Object

Iterate through all fields in an index by index ID.



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# File 'lib/innodb/data_dictionary.rb', line 465

def each_field_by_index_id(index_id)
  return enum_for(:each_field_by_index_id, index_id) unless block_given?

  each_field do |record|
    yield record if record["INDEX_ID"] == index_id
  end

  nil
end

#each_field_by_index_name(table_name, index_name, &block) ⇒ Object

Iterate through all fields in an index by index name.



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# File 'lib/innodb/data_dictionary.rb', line 476

def each_field_by_index_name(table_name, index_name, &block)
  return enum_for(:each_field_by_index_name, table_name, index_name) unless block_given?

  index = index_by_name(table_name, index_name)
  raise "Index #{index_name} for table #{table_name} not found" unless index

  each_field_by_index_id(index["ID"], &block)

  nil
end

#each_index ⇒ Object

Iterate through the records in the SYS_INDEXES dictionary table.



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# File 'lib/innodb/data_dictionary.rb', line 361

def each_index
  return enum_for(:each_index) unless block_given?

  each_record_from_data_dictionary_index(:SYS_INDEXES, :PRIMARY) do |record|
    yield record.fields
  end

  nil
end

#each_index_by_space_id(space_id) ⇒ Object

Iterate through indexes by space ID.



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# File 'lib/innodb/data_dictionary.rb', line 431

def each_index_by_space_id(space_id)
  return enum_for(:each_index_by_space_id, space_id) unless block_given?

  each_index do |record|
    yield record if record["SPACE"] == space_id
  end

  nil
end

#each_index_by_table_id(table_id) ⇒ Object

Iterate through all indexes in a table by table ID.



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# File 'lib/innodb/data_dictionary.rb', line 442

def each_index_by_table_id(table_id)
  return enum_for(:each_index_by_table_id, table_id) unless block_given?

  each_index do |record|
    yield record if record["TABLE_ID"] == table_id
  end

  nil
end

#each_index_by_table_name(table_name, &block) ⇒ Object

Iterate through all indexes in a table by table name.



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# File 'lib/innodb/data_dictionary.rb', line 453

def each_index_by_table_name(table_name, &block)
  return enum_for(:each_index_by_table_name, table_name) unless block_given?

  table = table_by_name(table_name)
  raise "Table #{table_name} not found" unless table

  each_index_by_table_id(table["ID"], &block)

  nil
end

#each_record_from_data_dictionary_index(table, index, &block) ⇒ Object

Iterate through records from a data dictionary index yielding each record as a Innodb::Record object.



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# File 'lib/innodb/data_dictionary.rb', line 330

def each_record_from_data_dictionary_index(table, index, &block)
  return enum_for(:each_record_from_data_dictionary_index, table, index) unless block_given?

  data_dictionary_index(table, index).each_record(&block)

  nil
end

#each_table ⇒ Object

Iterate through the records in the SYS_TABLES data dictionary table.



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# File 'lib/innodb/data_dictionary.rb', line 339

def each_table
  return enum_for(:each_table) unless block_given?

  each_record_from_data_dictionary_index(:SYS_TABLES, :PRIMARY) do |record|
    yield record.fields
  end

  nil
end

#found? ⇒ Boolean

Check if the data dictionary indexes are all available.

Returns:

  • (Boolean) 


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# File 'lib/innodb/data_dictionary.rb', line 239

def found?
  data_dictionary_indexes.values.map(&:values).flatten.none?(&:zero?)
end

#index_by_id(index_id) ⇒ Object

Lookup an index by index ID.



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# File 'lib/innodb/data_dictionary.rb', line 418

def index_by_id(index_id)
  object_by_field(:each_index, "ID", index_id)
end

#index_by_name(table_name, index_name) ⇒ Object

Lookup an index by table name and index name.



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# File 'lib/innodb/data_dictionary.rb', line 423

def index_by_name(table_name, index_name)
  table = table_by_name(table_name)
  return unless table

  object_by_two_fields(:each_index, "TABLE_ID", table["ID"], "NAME", index_name)
end

#object_by_field(method, field, value) ⇒ Object

A helper to iterate the method provided and return the first record where the record’s field matches the provided value.



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# File 'lib/innodb/data_dictionary.rb', line 384

def object_by_field(method, field, value)
  send(method).select { |o| o[field] == value }.first
end

#object_by_two_fields(method, field1, value1, field2, value2) ⇒ Object

A helper to iterate the method provided and return the first record where the record’s fields f1 and f2 match the provided values v1 and v2.



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# File 'lib/innodb/data_dictionary.rb', line 390

def object_by_two_fields(method, field1, value1, field2, value2)
  send(method).select { |o| o[field1] == value1 && o[field2] == value2 }.first
end

#record_describer_by_index_id(index_id) ⇒ Object

Return an Innodb::RecordDescriber object describing the records in a given index by index ID.



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# File 'lib/innodb/data_dictionary.rb', line 622

def record_describer_by_index_id(index_id)
  if (dd_index = data_dictionary_index_ids[index_id])
    return data_dictionary_index_describer(dd_index[:table], dd_index[:index])
  end

  unless (index = index_by_id(index_id))
    raise "Index #{index_id} not found"
  end

  unless (table = table_by_id(index["TABLE_ID"]))
    raise "Table #{INDEX['TABLE_ID']} not found"
  end

  record_describer_by_index_name(table["NAME"], index["NAME"])
end

#record_describer_by_index_name(table_name, index_name) ⇒ Object

Return an Innodb::RecordDescriber object describing records for a given index by table name and index name.



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# File 'lib/innodb/data_dictionary.rb', line 593

def record_describer_by_index_name(table_name, index_name)
  return data_dictionary_index_describer(table_name, index_name) if data_dictionary_index?(table_name, index_name)

  unless (index = index_by_name(table_name, index_name))
    raise "Index #{index_name} for table #{table_name} not found"
  end

  describer = Innodb::RecordDescriber.new

  if (index["TYPE"] & INDEX_TYPE_FLAG[:CLUSTERED]).zero?
    describer.type :secondary
  else
    describer.type :clustered
  end

  each_column_description_by_index_name(table_name, index_name) do |column|
    case column[:type]
    when :key
      describer.key column[:name], *column[:description]
    when :row
      describer.row column[:name], *column[:description]
    end
  end

  describer
end

#table_by_id(table_id) ⇒ Object

Lookup a table by table ID.



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# File 'lib/innodb/data_dictionary.rb', line 395

def table_by_id(table_id)
  object_by_field(:each_table, "ID", table_id)
end

#table_by_name(table_name) ⇒ Object

Lookup a table by table name.



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# File 'lib/innodb/data_dictionary.rb', line 400

def table_by_name(table_name)
  object_by_field(:each_table, "NAME", table_name)
end

#table_by_space_id(space_id) ⇒ Object

Lookup a table by space ID.



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# File 'lib/innodb/data_dictionary.rb', line 405

def table_by_space_id(space_id)
  object_by_field(:each_table, "SPACE", space_id)
end