Manual Reference Pages - MYSQLDIFF (1)
mysqldiff - compare MySQL database schemas
mysqldiff [B<options>] B<database1> B<database2>
mysqldiff is a Perl script front-end to the
CPAN <http://www.perl.com/CPAN> module
MySQL::Diff <http://search.cpan.org/search?module=MySQL::Diff> which
compares the data structures (i.e. schema / table definitions) of two
MySQL <http://www.mysql.com/> databases, and returns the differences
as a sequence of MySQL commands suitable for piping into mysql
which will transform the structure of the first database to be
identical to that of the second (c.f. diff and patch).
Database structures can be compared whether they are files containing
table definitions or existing databases, local or remote.
<B>N.B.B> The program makes no attempt to compare any of the data
which may be stored in the databases. It is purely for comparing the
table definitions. I have no plans to implement data comparison; it
is a complex problem and I have no need of such functionality anyway.
However there is another program
which does this, and is based on an older program called
datadiff which seems to have vanished off the net.
For PostgreSQL there are similar tools such as
pgdiff <http://pgdiff.sourceforge.net/> and
# compare table definitions in two files
mysqldiff db1.mysql db2.mysql
# compare table definitions in a file db1.mysql with a database db2
mysqldiff db1.mysql db2
# interactively upgrade schema of database db1 to be like the
# schema described in the file db2.mysql
mysqldiff -A db1 db2.mysql
# compare table definitions in two databases on a remote machine
mysqldiff --host=remote.host.com --user=myaccount db1 db2
# compare table definitions in a local database foo with a
# database bar on a remote machine, when a file foo already
# exists in the current directory
mysqldiff --host2=remote.host.com --password=secret db:foo bar
More details to come; for now run mysqldiff --help.
For both of the database structures being compared, the following
If the argument is a valid filename, the file is used to create a
temporary database which mysqldump -d is run on to obtain the table
definitions in canonicalised form. The temporary database is then
dropped. (The temporary database is named
test_mysqldiff_temp_something because default MySQL permissions
allow anyone to create databases beginning with the prefix test_.)
If the argument is a database, mysqldump -d is run directly on it.
Where authentication is required, the hostname, username, and password
given by the corresponding options are used (type mysqldiff --help
for more information).
Each set of table definitions is now parsed into tables, and fields
and index keys within those tables; these are compared, and the
differences outputted in the form of MySQL statements.
BUGS, DEVELOPMENT, CONTRIBUTING
COPYRIGHT AND LICENSE
Copyright (c) 2000-2011 Adam Spiers. All rights reserved. This
program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
MySQL::Diff, MySQL::Diff::Database, MySQL::Diff::Table, MySQL::Diff::Utils,
mysql, mysqldump, mysqlshow
Adam Spiers <firstname.lastname@example.org>
|perl v5.20.3 ||MYSQLDIFF (1) ||2016-04-03 |
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