PHP Manual
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# db2_num_rows

(no version information, might be only in CVS)

db2_num_rows -- Returns the number of rows affected by an SQL statement

## 说明

int db2_num_rows ( resource stmt )

警告
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。使用本函数风险自担。

Returns the number of rows deleted, inserted, or updated by an SQL statement.

To determine the number of rows that will be returned by a SELECT statement, issue SELECT COUNT(*) with the same predicates as your intended SELECT statement and retrieve the value.

If your application logic checks the number of rows returned by a SELECT statement and branches if the number of rows is 0, consider modifying your application to attempt to return the first row with one of db2_fetch_assoc(), db2_fetch_both(), db2_fetch_into(), or db2_fetch_row(), and branch if the fetch function returns `FALSE`.

> 注: If you issue a SELECT statement using a scrollable cursor, db2_num_rows() returns the number of rows returned by the SELECT statement. However, the overhead associated with scrollable cursors significantly degrades the performance of your application, so if this is the only reason you are considering using scrollable cursors, you should use a forward-only cursor and either call SELECT COUNT(*) or rely on the boolean return value of the fetch functions to achieve the equivalent functionality with much better performance.

## 参数

stmt

  A valid stmt resource containing a result set.

## 返回值

Returns the number of rows affected by the last SQL statement issued by the specified statement handle.

后退 | 起点 | 前进
db2_num_fields | 上一级 | db2_pconnect