Cronos87 Cronos87 - 2 months ago 31
MySQL Question

PyMySQL Insert NULL or a String

I tried to insert with PyMySQL a field (title) that's can be NULL or a string. But it doesn't work.

query = """
INSERT INTO `chapter` (title, chapter, volume)
VALUES ("%s", "%s", %d)
"""

cur.execute(query % (None, "001", 1))
cur.execute(query % ("Title", "001", 1))


This code insert None in the database. If I remove the double quote around the first %s, it throw an error:

pymysql.err.InternalError: (1054, "Unknown column 'None' in 'field list'")


How can I do to insert NULL?

Answer

1) Never use string formatting for sql

2) try

query = """
INSERT INTO `chapter` (title, chapter, volume)
VALUES (%s, %s, %s)
"""
cur.execute(query, (None, "001", 1))
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