Last active
December 20, 2015 11:49
-
-
Save cstorey/6126229 to your computer and use it in GitHub Desktop.
A trivial Sequel database cleaner.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
require 'sequel' | |
require 'tsort' | |
class TableCleaner | |
def initialize db, excluded_tables | |
@db = db | |
@excluded_tables = excluded_tables | |
end | |
def clean | |
@db.transaction do | |
tables_to_clean do |t| | |
@db[t].delete | |
end | |
end | |
end | |
private | |
include TSort | |
def tables_to_clean &block | |
tsort.reverse.each &block | |
end | |
def tsort_each_node &block | |
@db.tables.each do |t| | |
block.call t unless @excluded_tables.include? t | |
end | |
end | |
def tsort_each_child table, &block | |
@db.foreign_key_list(table).each do |fk| | |
block.call fk[:table] unless @excluded_tables.include? fk[:table] | |
end | |
end | |
end | |
# Example usage. | |
require 'logger' | |
db = Sequel.connect ARGV[0], logger: Logger.new($stderr) | |
cleaner = TableCleaner.new db, [:spatial_ref_sys] | |
cleaner.clean |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment