Why Does My Parameterized SQL Query Throw a 'not all arguments converted during string formatting' Error?

Troubleshooting Parameterized SQL Query Errors: Resolving "not all arguments converted during string formatting"

When attempting to execute parameterized SQL queries, developers may encounter the error: "TypeError: not all arguments converted during string formatting." This issue typically arises when using string formatting for the query with insufficient or incorrectly formatted parameters.

To resolve this error, it is crucial to ensure that each placeholder in the formatted string is matched with a corresponding argument in the query. In the given code snippet:

cur.execute("SELECT * FROM records WHERE email LIKE '%s'", search)

The placeholder '%s' in the query represents a parameter to be replaced with the value in search. However, the execute method expects a list or tuple containing the parameters. To rectify this, the following modification can be made:

cur.execute("SELECT * FROM records WHERE email LIKE %s", [search])

By wrapping search in a list, it becomes an iterable that can be unpacked into individual parameters. The correct syntax for executing parameterized queries in MySQLdb requires the parameters to be passed as a list.

This simple adjustment ensures that all arguments are converted correctly during string formatting and eliminates the aforementioned error. Alternatively, a tuple (an immutable list) can be used instead of a list for passing the parameters.

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