PDOStatement::rowCount

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)

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

Descrizione

public PDOStatement::rowCount(): int

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

For statements that produce result sets, such as SELECT, the behavior is undefined and can be different for each driver. Some databases may return the number of rows produced by that statement (e.g. MySQL in buffered mode), but this behaviour is not guaranteed for all databases and should not be relied on for portable applications.

Nota:

This method returns "0" (zero) with the SQLite driver at all times, and with the PostgreSQL driver only when setting the PDO::ATTR_CURSOR statement attribute to PDO::CURSOR_SCROLL.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

Returns the number of rows.

Errori/Eccezioni

Emits an error with level E_WARNING if the attribute PDO::ATTR_ERRMODE is set to PDO::ERRMODE_WARNING.

Throws a PDOException if the attribute PDO::ATTR_ERRMODE is set to PDO::ERRMODE_EXCEPTION.

Esempi

Example #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";
?>

Il precedente esempio visualizzerà qualcosa simile a:

Return number of rows that were deleted:
Deleted 9 rows.

Example #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::fetchColumn() to retrieve the number of matching rows.

<?php
$sql
= "SELECT COUNT(*) FROM fruit WHERE calories > 100";
$res = $conn->query($sql);
$count = $res->fetchColumn();

print
"There are " . $count . " matching records.";

Il precedente esempio visualizzerà qualcosa simile a:

There are 2 matching records.

Vedere anche:

add a note

User Contributed Notes 13 notes

up
89
Ome Ko
13 years ago
When updating a Mysql table with identical values nothing's really affected so rowCount will return 0. As Mr. Perl below noted this is not always preferred behaviour and you can change it yourself since PHP 5.3.

Just create your PDO object with
<? php
$p = new PDO($dsn, $u, $p, array(PDO::MYSQL_ATTR_FOUND_ROWS => true));
?>
and rowCount() will tell you how many rows your update-query actually found/matched.
up
42
Matt
17 years ago
Great, while using MySQL5, the only way to get the number of rows after doing a PDO SELECT query is to either execute a separate SELECT COUNT(*) query (or to do count($stmt->fetchAll()), which seems like a ridiculous waste of overhead and programming time.

Another gripe I have about PDO is its inability to get the value of output parameters from stored procedures in some DBMSs, such as SQL Server.

I'm not so sure I'm diggin' PDO yet.
up
33
Daniel Karp
12 years ago
Note that an INSERT ... ON DUPLICATE KEY UPDATE statement is not an INSERT statement, rowCount won't return the number or rows inserted or updated for such a statement. For MySQL, it will return 1 if the row is inserted, and 2 if it is updated, but that may not apply to other databases.
up
25
leandro at marquesini dot com
12 years ago
To display information only when the query is not empty, I do something like this:

<?php
$sql
= 'SELECT model FROM cars';
$stmt = $db->prepare($sql);
$stmt->execute();

if (
$data = $stmt->fetch()) {
do {
echo
$data['model'] . '<br>';
} while (
$data = $stmt->fetch());
} else {
echo
'Empty Query';
}
?>
up
18
gunnrosebutpeace at gmail dot com
16 years ago
It'd better to use SQL_CALC_FOUND_ROWS, if you only use MySQL. It has many advantages as you could retrieve only part of result set (via LIMIT) but still get the total row count.
code:
<?php
$db
= new PDO(DSN...);
$db->setAttribute(array(PDO::MYSQL_USE_BUFFERED_QUERY=>TRUE));
$rs = $db->query('SELECT SQL_CALC_FOUND_ROWS * FROM table LIMIT 5,15');
$rs1 = $db->query('SELECT FOUND_ROWS()');
$rowCount = (int) $rs1->fetchColumn();
?>
up
12
sERGE-01
10 years ago
In some drivers rowCount() only works when using the prepare() with PDO::CURSOR_SCROLL
So, you can modify PDO class:

<?php
class myPDO extends PDO
{
function
query($query, $values=null)
{
if(
$query == "")
return
false;

if(
$sth = $this->prepare($query, array(PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL)))
{
$res = ($values) ? $sth->execute($values) : $sth->execute();
if(!
$res)
return
false;
}
return
$sth;
}
}
?>

Now let's test (i using php 5.2.9-2):

<?php
function TestRowCount($dsn, $db_user, $db_pass)
{
$pdh = new PDO($dsn, $db_user, $db_pass);
$sth = $pdh->query("SELECT * FROM sys.tables");
print
"rowCount() Standart: ".$sth->rowCount()."<br>";

$pdh = new myPDO($dsn, $db_user, $db_pass);
$sth = $pdh->query("SELECT * FROM sys.tables");
print
"rowCount() New: ".$sth->rowCount()."<br><br>";

$pdh=null;
}

$db_server = "xxx";
$db_name = "xxx";
$db_user = "xxx";
$db_pass = "xxx";

print
"PDO_MSSQL"."<br>";
TestRowCount("mssql:host=$db_server;dbname=$db_name", $db_user, $db_pass);

print
"MSSQL throw PDO_ODBC"."<br>";
TestRowCount("odbc:DRIVER={SQL Server};SERVER=$db_server;DATABASE=$db_name;", $db_user, $db_pass);

print
"MS SQL driver 2.0"."<br>";
TestRowCount("sqlsrv:server=$db_server;Database=$db_name", $db_user, $db_pass);
?>

My results:
-------------------
PDO_MSSQL
rowCount() Standart: 0
rowCount() New: 0

MSSQL throw PDO_ODBC
rowCount() Standart: -1
rowCount() New: 53

MS SQL driver 2.0
rowCount() Standart: -1
rowCount() New: 53
-------------------

With myPDO class you can use prepared queries like:
<?php
$pdh
= new myPDO($dsn, $db_user, $db_pass);
$sth = $pdh->query("select * from data where id>? or name like ?", array(100, "A%"));
?>
up
5
xmt at abv dot bg
6 years ago
Note:
=====
On Mysql SELECT statement with Buffered queries, rowCount will return the correct count of the items in the result set.
BUT if your query is unbuffered, than it will return 0. No matter if all the rows are retrieved from the result set or not (while in mysqli this behaviour is different - you will still get the number of items in the result set with unbuffered queries, but only when you retrieve all the rows from the set).

Example:
========
$conn = new PDO("mysql:host=127.0.0.1;dbname=db", 'root', 'root');

// use unbuffered query
$conn->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);

$stmt = $conn->query("select * from towns");

echo $stmt->rowCount(); // will always return 0
up
8
user at nospam dot example dot com
11 years ago
MySQL does not seem to return anything in rowCount for a select statement, but you can easily and efficiently get the row count as follows:

class db extends PDO {
public function last_row_count() {
return $this->query("SELECT FOUND_ROWS()")->fetchColumn();
}
}

$myDb = new db('mysql:host=myhost;dbname=mydb', 'login', 'password' );

Then, after running your query:

if ( $myDb->last_row_count() == 0 ) {
echo "Do something!";
}
up
2
info at buylikesandviews dot com
9 years ago
every good work
If you use "INSERT INTO ... ON DUPLICATE KEY UPDATE" syntax, mysql_affected_rows() will return you 2 if the UPDATE was made (just as it does with the "REPLACE INTO" syntax) and 1 if the INSERT was.

So if you use one SQL request to insert several rows at a time, and some are inserted, some are just updated, you won't get the real count..
up
1
lsrzj at facebook
8 years ago
Well, I woundn't do as suggested querying twice the database to get the count and then get the data I want. It would be simpler and would give better performance to query once and retrieve both, record count and the data itself

<?php
$sql
= "SELECT * FROM fruit WHERE calories > :calories";
$sth = $conn->prepare($sql);
$sth->bindParam(':calories', 100, PDO::PARAM_INT);
$res = $sth->execute();
if (
$res) {
$record = $sth->fetchAll();
/* Check the number of rows that match the SELECT statement */
if (count($record) > 0) {
foreach (
$record as $row) {
print
"Name: " . $row['NAME'] . "\n";
}
}
/* No rows matched -- do something else */
else {
print
"No rows matched the query.";
}
}
$conn = null;
?>
up
0
bohwaz
5 years ago
Please note another interesting behavior with PostgreSQL.

If you try to use rowCount() after a statement has been prepared using the PDO::ATTR_CURSOR set to PDO::CURSOR_SCROLL you will always get zero (0).

That's because PG doesn't have any way to tell how many rows are in the cursor until it did iterate through all rows.

<?php
$st
= $pdo->prepare('SELECT NOW();', [PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL]);
$st->execute();
var_dump($st->rowCount());
?>

Will return "0", whereas the same statement without the CURSOR_SCROLL attribute, will correctly return 1.

Please see this bug report https://bugs.php.net/bug.php?id=77855 for details.

This documentation should be updated shortly to reflect that issue.
up
-4
e dot sand at elisand dot com
15 years ago
As of SQLite 3.x, the SQLite API itself changed and now all queries are implemented using "statements". Because of this, there is no way for PDO to know the rowCount of a SELECT result because the SQLite API itself doesn't offer this ability.

As a workaround, I created my own rowCount() function - it's a bit of a hack and hasn't been fully tested yet (I don't know how it will work when using JOINs in SELECTs, etc...), but at least alleviates the necessity for SELECT COUNT(*)'s everywhere in your code.

I would have preferred if it were possible to overload the rowCount() function from PDOStatement, but I don't think it's possible (or I don't know how to do it). There's also potential room for a bit more security ensuring that $queryString is wiped clean after other query()s so that you don't get a bad result, etc...

The actual code should be posted in the above/below post (max post limits, argh!). If others wish to extend/perfect this method, please keep me posted with an email as to what you've done.
up
-5
@rhavendc (twitter)
8 years ago
We're having problem with these PDOStatement::fetchColumn() and PDOStatement::rowCount(). I don't know if we have alike case to others or this is just a problem in our coding. In local, the rowCount() is not giving the correct number of rows but it is working fine when uploaded to our hosting site.. while the fetchColumn() is the reverse. The fetchColumn() is working fine in local but not anymore when uploaded. I don't know what is really going on with that but I think rowCount() is the best and the others are optional to use.
To Top