dreamsxin/mysql-postgresql-converter — pull request #2 by dreamsxin (2014-07-03 13:49:03+00:00)
Title: Avoid rewriting quoted SQL

If your database contains text fields which contain

'0000-00-00 00:00:00'

then the existing search/replace with NULL would create syntax errors
by accidentally closing the quotes.

'\'0000-00-00 00:00:00\'' # one string, from MySQL
'''0000-00-00 00:00:00''' # one string, after replacing \' with ''
''NULL'' # syntax error: string NULL string