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PDOStatement::rowCount

(no version information, might be only in CVS)

PDOStatement::rowCount -- Returns the number of rows affected by the last SQL statement

Описание

int PDOStatement::rowCount ( void )

Внимание

Эта функция является ЭКСПЕРИМЕНТАЛЬНОЙ. Поведение этой функции, ее имя и относящаяся к ней документация могут измениться в последующих версиях PHP без уведомления. Используйте эту функцию на свой страх и риск.

PDOStatement::rowCount() returns the number of rows affected by the last DELETE, INSERT, or UPDATE statement executed by the corresponding PDOStatement object.

If the last SQL statement executed by the associated PDOStatement was a SELECT statement, some databases may return the number of rows returned by that statement. However, this behaviour is not guaranteed for all databases and should not be relied on for portable applications.

Примеры

Пример 1. Return the number of deleted rows

PDOStatement::rowCount() returns the number of rows affected by a DELETE, INSERT, or UPDATE statement.


<?php


/* Delete all rows from the FRUIT table */


$del 
= 
$dbh
->
prepare
(
'DELETE FROM fruit'
);


$del
->
execute
();




/* Return number of rows that were deleted */


print(
"Return number of rows that were deleted:\n"
);


$count 
= 
$del
->
rowCount
();

print(
"Deleted $count rows.
\n
"
);


?>

Результат выполнения данного примера:

Deleted 9 rows.

Пример 2. Counting rows returned by a SELECT statement

For most databases, PDOStatement::rowCount() does not return the number of rows affected by a SELECT statement. Instead, use PDO::query() to issue a SELECT COUNT(*) statement with the same predicates as your intended SELECT statement, then use PDOStatement::fetchSingle() to retrieve the number of rows that will be returned. Your application can then perform the correct action.


<?php

$sql 
= 
"SELECT COUNT(*) FROM fruit WHERE calories > 100"
;

if (
$res 
= 
$conn
->
query
(
$sql
)) {



    
// Check the number of rows that match the SELECT statement

    
if (
$res
->
fetchSingle
() > 
0
) {



        
// Issue the real SELECT statement and work with the results

         
$sql 
= 
"SELECT name FROM fruit WHERE calories > 100"
;

         foreach (
$conn
->
query
(
$sql
) as 
$row
) {

             print 
"Name: " 
.  
$row
[
'NAME'
] . 
"\n"
;

         }

    }

    
// No rows matched -- do something else

    
else {

        print 
"No rows matched the query."
;

    }

}




$res 
= 
null
;


$conn 
= 
null
;


?>

Результат выполнения данного примера:

apple
banana
orange
pear

Смотрите также

PDOStatement::query()

PDOStatement::fetchSingle()

Все функции PHP: