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module Departure
class InvalidAlterStatement < StandardError; end
# Represents the '--alter' argument of Percona's pt-online-schema-change
# See https://www.percona.com/doc/percona-toolkit/2.0/pt-online-schema-change.html
class AlterArgument
ALTER_TABLE_REGEX = /\AALTER TABLE [^\s]*[\n]* /
attr_reader :table_name
# Constructor
#
# @param statement [String]
# @raise [InvalidAlterStatement] if the statement is not an ALTER TABLE
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
# Returns the '--alter' pt-online-schema-change argument as a string. See
# https://www.percona.com/doc/percona-toolkit/2.0/pt-online-schema-change.html
def to_s
"--alter \"#{parsed_statement}\""
end
private
attr_reader :statement
# Removes the 'ALTER TABLE' portion of the SQL statement
#
# @return [String]
def parsed_statement
@parsed_statement ||= statement
.gsub(ALTER_TABLE_REGEX, '')
.gsub('`', '\\\`')
.gsub(/\\n/, '')
.gsub('"', '\\\"')
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems