perl - 使用DBI的非选择语句的prepare/execute时，如何获取受影响的行数？

Question

根据DBI文档，看来我只能通过do方法获取受影响的行数。

$rows_affected = $dbh->do("UPDATE your_table SET foo = foo + 1");

如果我使用 prepare/ execute，如何获得相同的结果？

Answer 1

从有关 execute method in DBI的文档中:

For a non-"SELECT" statement, "execute" returns the number of rows affected, if known. If no rows were affected, then "execute" returns "0E0", which Perl will treat as 0 but will regard as true. Note that it is not an error for no rows to be affected by a statement. If the number of rows affected is not known, then "execute" returns -1.