Error migrating from PostgreSQL to MySQL [42703] - mysql

Question

I have a database in Postgres that I would like to migrate to MySQL, but whenever I get to the reverse engineering stage of the MySQL Workbench Migration Wizard I get an error. The error is:
ERROR: Reverse engineer selected schemas: ProgrammingError("('42703', '[42703] ERROR: column "min_value" does not exist;\nError while executing the query (1) (SQLExecDirectW)')"): error calling Python module function DbPostgresqlRE.reverseEngineer
Failed
The full error log is:
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\db_generic_re_grt.py", line 237, in reverseEngineer
catalog = cls.reverseEngineerCatalog(connection, catalog_name)
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\db_generic_re_grt.py", line 397, in reverseEngineerCatalog
cls.reverseEngineerSequences(connection, schema)
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\db_postgresql_re_grt.py", line 76, in reverseEngineerSequences
min_value, max_value, start_value, increment_by, last_value, is_cycled, ncache = cls.execute_query(connection, seq_details_query % (schema.name, seq_name)).fetchone()
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\db_generic_re_grt.py", line 76, in execute_query
return cls.get_connection(connection_object).cursor().execute(query, *args, **kwargs)
pyodbc.ProgrammingError: ('42703', '[42703] ERROR: column "min_value" does not exist;\nError while executing the query (1) (SQLExecDirectW)')
Traceback (most recent call last):
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\workbench\wizard_progress_page_widget.py", line 192, in thread_work
self.func()
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\migration_schema_selection.py", line 175, in task_reveng
self.main.plan.migrationSource.reverseEngineer()
File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\migration.py", line 369, in reverseEngineer
self.state.sourceCatalog = self._rev_eng_module.reverseEngineer(self.connection, self.selectedCatalogName, self.selectedSchemataNames, self.state.applicationData)
SystemError: ProgrammingError("('42703', '[42703] ERROR: column "min_value" does not exist;\nError while executing the query (1) (SQLExecDirectW)')"): error calling Python module function DbPostgresqlRE.reverseEngineer
ERROR: Reverse engineer selected schemas: ProgrammingError("('42703', '[42703] ERROR: column "min_value" does not exist;\nError while executing the query (1) (SQLExecDirectW)')"): error calling Python module function DbPostgresqlRE.reverseEngineer
Failed
I tried modifying the Python script as described in the top comment here, but that did not stop the error. Does anyone know how I could resolve this?

Answer 1

Fix File "C:\Program Files\MySQL\MySQL Workbench 6.3 CE\modules\db_postgresql_re_grt.py" lines ~70 change to
seq_details_query = """SELECT min_value, max_value, start_value,
increment_by, last_value, cycle as is_cycled, cache_size as cache_value
FROM pg_catalog.pg_sequences
WHERE schemaname = '%s' AND sequencename = '%s' """

Answer 2

I have PostgreSQL 10.5
Replaced in db_postgresql_re_grt.py:80
min_value, max_value, start_value, increment_by, last_value, is_cycled, ncache = cls.execute_query(connection, seq_details_query % (schema.name, seq_name)).fetchone()
with:
last_value, log_cnt, is_called = cls.execute_query(connection, """SELECT last_value, log_cnt, is_called FROM "%s"."%s" """ % (schema.name, seq_name)).fetchone()
seqrelid, seqtypid, seqstart, seqincrement, seqmax, seqmin, seqcache, seqcycle = cls.execute_query(connection, "select seqrelid, seqtypid, seqstart, seqincrement, seqmax, seqmin, seqcache, seqcycle from pg_sequence where seqrelid = '%s'::regclass" % seq_name).fetchone()
min_value = seqmin
max_value = seqmax
start_value = seqstart
increment_by = seqincrement
is_cycled = seqcycle
ncache = seqcache