Why Am I Getting a 'SQL Syntax Error' When Using Prepared Statements in Python with MySQL?

Using Prepared Statements with MySQL in Python: Clarifying Syntax and Avoiding Errors

You're encountering an error when using prepared statements with MySQL in Python, with the message "'You have an error in your SQL syntax'". Let's examine the code you provided and identify the issue.

The code you used to prepare the statement appears correct, but the subsequent execution of the statement contains the error. Specifically, the code in the loop seems to be using parameters with a different syntax than the prepared statement expects.

sql = "EXECUTE stmt USING \'{}\', \'{}\', {}, {};".format(d, t, tag, power)

In the example provided by the answer, a more efficient approach using Python's MySQLdb module is suggested:

sql = ('INSERT INTO {} (date, time, tag, power) VALUES '
       '(%s, %s, %s, %s)'.format(self.db_scan_table))

self.cursor.execute(sql, (d, t, tag, power))

Here, the placeholders for the values (%s) are specified directly in the SQL query string, and the actual values are passed as a tuple in the execute call. This eliminates the need for string formatting in the execution stage, which was likely causing the syntax error in your code.

Alternatively, you can use MySQL's own Connector/Python with the prepare=True option in the cursor() factory, which is more efficient and explicit than using the PREPARE and EXECUTE statements.

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