Class: Departure::AlterArgument

Inherits:
Object
  • Object
show all
Defined in:
lib/departure/alter_argument.rb

Overview

Represents the ‘–alter’ argument of Percona’s pt-online-schema-change See www.percona.com/doc/percona-toolkit/2.0/pt-online-schema-change.html

Constant Summary collapse

ALTER_TABLE_REGEX = 
/\AALTER TABLE [^\s]*[\n]* /

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(statement) ⇒ AlterArgument

Constructor

Parameters:

  • statement (String)

Raises:



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# File 'lib/departure/alter_argument.rb', line 15

def initialize(statement)
  @statement = statement

  match = statement.match(ALTER_TABLE_REGEX)
  raise InvalidAlterStatement unless match
  # Separates the ALTER TABLE from the table_name
  #
  # Removes the grave marks, if they are there, so we can get the table_name
  @table_name = String(match)
                  .split(' ')[2]
                  .delete('`')
end

Instance Attribute Details

#table_name ⇒ Object (readonly)

Returns the value of attribute table_name.



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# File 'lib/departure/alter_argument.rb', line 9

def table_name
  @table_name
end

Instance Method Details

#to_s ⇒ Object

Returns the ‘–alter’ pt-online-schema-change argument as a string. See www.percona.com/doc/percona-toolkit/2.0/pt-online-schema-change.html



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# File 'lib/departure/alter_argument.rb', line 30

def to_s
  "--alter \"#{parsed_statement}\""
end