PgDiff: check schema existance.
### named connections
databases = {
# database for tests.py (postgres, mysql - remove one of the lines to skip particular tests)
'test' : 'host=127.0.0.1 dbname=test user=test password=test',
'test_mysql' : 'host=127.0.0.1 db=test user=test password=test',
}
### meta database (contains connection parameters for other databases)
meta_db = 'host=10.8.0.1 dbname=central'
# query for connection parameters, input is database name (will be placed instead of %s)
meta_query = '''SELECT host, port, dbname, user, password FROM config.databases WHERE name = %s LIMIT 1'''