Question

I would like to generate diff-like SQL files to compare the DATA and the STRUCTURE of two MySQL databases.

These resulting files would be executed as SQL queries, on command-line.

There is various old threads related on SO, and on various forums, but they deal with non-free tool with user interface (not command-line tools).

Also, the database should not be synced directly, but only by executing the resulting diff SQL script.

Answer 1

The following will have a go at showing you the differences (the first part of your question) but the output won’t really be useable as patch files.

To compare two tables:

 mysql -u whatever -e "describe table" database1 > file1.txt
 mysql -u whatever -e "describe table" database2 > file2.txt
 diff file1.txt file2.txt

To compare data:

 mysql -u whatever -e "select * from table" database1 > file1.txt
 mysql -u whatever -e "select * from table" database2 > file2.txt
 diff file1.txt file2.txt

To compare databases:

 mysqldump --extended-insert=FALSE -u whatever database1 > file1.txt
 mysqldump --extended-insert=FALSE -u whatever database2 > file2.txt
 diff file1.txt file2.txt