db2_num_rows

(PECL ibm_db2:1.0-1.6.2)

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

说明

int db2_num_rows ( resource $stmt )

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_array(), or db2_fetch_row(), and branch if the fetch function returns FALSE.

Note: 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.


	PHP5中文手册 db2_num_fields db2_pconnect ibm_db2 PHP Manual db2_num_rows (PECL ibm_db2:1.0-1.6.2) db2_num_rows — Returns the number of rows affected by an SQL statement 说明 int db2_num_rows ( resource `$stmt` ) 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_array(), or db2_fetch_row(), and branch if the fetch function returns `FALSE`. Note: 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. db2_num_fields db2_pconnect ibm_db2 PHP Manual