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unsigned int mysql_stmt_field_count(MYSQL_STMT * stmt);
stmt - a statement handle, which was previously allocated by mysql_stmt_init().
stmt
Returns the number of fields in a result set of a prepared statement.
The number of fields will be available after calling
mysql_stmt_field_count() returns zero for UPSERT statements which don't produce a result set.
mysql_stmt_field_count()
UPSERT