使用Python 3从Mysql检索和选择二进制值

Question

I'm trying to select data from one table, and perform a query on another table using the returned values from the first table.

Both tables are case-sensitive, and of type utf8-bin.

When I perform my first select, I am returned a tuple of binary values:

query = """SELECT id FROM table1"""
results = (b'1234', b'2345', b'3456')

I'd then like to perform a query on table2 using the ids returned from table1:

query = """SELECT element FROM table2 WHERE id IN (%s) """ % results

Is this the right way to do this?

Answer 1

You need to create the query so that it can be properly parameterized:

query = """SELECT element FROM table2 WHERE id IN (%s) """ % ",".join(['%s'] * len(results))

This will transform the query to:

query = """SELECT element FROM table2 WHERE id IN (%s,%s,%s) """

Then you can just pass query and results to the execute() (or appropriate) method so that results are properly parameterized.