The Invoke function had two bugs:
1. A panic would occur when scanning a row containing a NULL value in a
TEXT or VARCHAR column. The code did not check for nil before attempting
a type assertion on the scanned value.
2. The *sql.Rows result was not being closed on all code paths, leading
to connection leaks that could exhaust the database connection pool.
This change corrects both issues. A guard clause now checks for nil
values before processing, and rows.Close() is deferred to guarantee the
connection is released.
Co-authored-by: Yuan <45984206+Yuan325@users.noreply.github.com>
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