Class: Flydata::TableDef::MysqlTableDef

Inherits:
Object
  • Object
show all
Defined in:
lib/flydata/table_def/mysql_table_def.rb

Constant Summary collapse

TYPE_MAP_M2F = 
{
  'bigint' => 'int8',
  'binary' => 'binary',
  'blob' => 'varbinary(65535)',
  'bool' => 'int1',
  'boolean' => 'int1',
  'char' => 'varchar',
  'date' => 'date',
  'datetime' => 'datetime',
  'dec' => 'numeric',
  'decimal' => 'numeric',
  'double' => 'float8',
  'double precision' => 'float8',
  'enum' => 'enum',
  'fixed' => 'numeric',
  'float' => 'float4',
  'int' => 'int4',
  'integer' => 'int4',
  'longblob' => 'varbinary(4294967295)',
  'longtext' => 'text',
  'mediumblob' => 'varbinary(16777215)',
  'mediumint' => 'int3',
  'mediumtext' => 'text',
  'numeric' => 'numeric',
  'smallint' => 'int2',
  'text' => 'text',
  'time' => 'time',
  'timestamp' => 'datetime',
  'tinyblob' => 'varbinary(255)',
  'tinyint' => 'int1',
  'tinytext' => 'text',
  'varbinary' => 'varbinary',
  'varchar' => 'varchar',
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(table_def, table_name, columns, default_charset, comment) ⇒ MysqlTableDef

Returns a new instance of MysqlTableDef.



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 70

def initialize(table_def, table_name, columns, default_charset, comment)
  @table_def = table_def
  @table_name = table_name
  @columns = columns
  @default_charset = default_charset
  @comment = comment
end

Instance Attribute Details

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 131

def columns
  @columns
end

#table_name ⇒ Object (readonly)

Returns the value of attribute table_name.



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 131

def table_name
  @table_name
end

Class Method Details

._create(io) ⇒ Object 



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 78

def self._create(io)
  table_def = ''
  table_name = nil
  columns = []
  default_charset = nil
  comment = nil

  position = :before_create_table

  io.each_line do |line|
    case position
    when :before_create_table
      if line =~ /CREATE TABLE `(.*?)`/
        position = :in_create_table
        table_name = $1
        table_def += line.chomp
        next
      end

    when :in_create_table
      table_def += line.chomp

      stripped_line = line.strip
      # `col_smallint` smallint(6) DEFAULT NULL,
      if stripped_line.start_with?('`')
        columns << parse_one_column_def(line)
      # PRIMARY KEY (`id`)
      elsif stripped_line.start_with?("PRIMARY KEY")
        parse_key(line, columns)
      #) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='test table';
      elsif stripped_line.start_with?(')')
        default_charset = $1 if line =~ /DEFAULT CHARSET\s*=\s*([^\s]+)/
        comment = $1 if /COMMENT='((?:\\'|[^'])*)'/.match(line)
        position = :after_create_table
      elsif stripped_line.start_with?("KEY")
        # index creation.  No action required.
      elsif stripped_line.start_with?("CONSTRAINT")
        # constraint definition.  No acction required.
      elsif stripped_line.start_with?("UNIQUE KEY")
        parse_key(line, columns, :unique)
      else
        $stderr.puts "Unknown table definition. Skip. (#{line})"
      end

    when :after_create_table
      unless columns.any? {|column| column[:primary_key]}
        raise TableDefError, {error: "no primary key defined", table: table_name}
      end
      break
    end
  end
  position == :after_create_table ? [table_def, table_name, columns, default_charset, comment] : nil
end

.check_and_set_varchar_length(type, mysql_type, flydata_type) ⇒ Object

Check and set the varchar(char) size which is converted from length to byte size. On Mysql the record size of varchar(char) is a length of characters. ex) varchar(6) on mysql -> varchar(18) on flydata



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 55

def self.check_and_set_varchar_length(type, mysql_type, flydata_type)
  return type unless %w(char varchar).include?(mysql_type)
  if type =~ /\((\d+)\)/
    # expect 3 byte UTF-8 character
    "#{flydata_type}(#{$1.to_i * 3})"
  else
    raise "Invalid varchar type. It must be a bug... type:#{type}"
  end
end

.convert_to_flydata_type(type) ⇒ Object 



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 40

def self.convert_to_flydata_type(type)
  TYPE_MAP_M2F.each do |mysql_type, flydata_type|
    if /^#{mysql_type}\(|^#{mysql_type}$/.match(type)
      ret_type = type.gsub(/^#{mysql_type}/, flydata_type)
      ret_type = check_and_set_varchar_length(ret_type, mysql_type, flydata_type)
      return ret_type
    end
  end
  nil
end

.create(io) ⇒ Object 



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 65

def self.create(io)
  params = _create(io)
  params ? self.new(*params) : nil
end

.parse_one_column_def(query) ⇒ Object 



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 143

def self.parse_one_column_def(query)
  line = query.strip
  line = line[0..-2] if line.end_with?(',')
  pos = 0
  cond = :column_name
  column = {}

  while pos < line.length
    case cond
    when :column_name  #`column_name` ...
      pos = line.index(' ', 1)
      column[:column] = if line[0] == '`'
                        line[1..pos-2]
                      else
                        line[0..pos-1]
                      end
      cond = :column_type
      pos += 1
    when :column_type  #... formattype(,,,) ...
      pos += 1 until line[pos] != ' '
      start_pos = pos
      pos += 1 until line[pos].nil? || line[pos] =~ /\s|\(/

      # meta
      if line[pos] == '('
        #TODO: implement better parser
        pos = line.index(')', pos)
        pos += 1
      end

      # type
      type = line[start_pos..pos-1]
      column[:type] = convert_to_flydata_type(type)

      cond = :options
    when :options
      column[:type] += ' unsigned' if line =~ /unsigned/i
      column[:auto_increment] = true if line =~ /AUTO_INCREMENT/i
      column[:not_null] = true if line =~ /NOT NULL/i
      column[:unique] = true if line =~ /UNIQUE/i
      if /DEFAULT\s+((?:[^'\s]+\b)|(?:'(?:\\'|[^'])*'))/i.match(line)
        val = $1
        val = val.slice(1..-1) if val.start_with?("'")
        val = val.slice(0..-2) if val.end_with?("'")
        column[:default] = val == "NULL" ? nil : val
      end
      if /COMMENT\s+'(((?:\\'|[^'])*))'/i.match(line)
        column[:comment] = $1
      end
      if block_given?
        column = yield(column, query, pos)
      end
      break
    else
      raise "Invalid condition. It must be a bug..."
    end
  end
  column
end

Instance Method Details

#to_flydata_tabledef ⇒ Object 



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# File 'lib/flydata/table_def/mysql_table_def.rb', line 133

def to_flydata_tabledef
  tabledef = { table_name: @table_name,
               columns: @columns,
             }
  tabledef[:default_charset] = @default_charset if @default_charset
  tabledef[:comment] = @comment if @comment

  tabledef
end