(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)
PDOStatement::rowCount — Liefert die Anzahl der von der letzten SQL-Anweisung betroffenen Zeilen
PDOStatement::rowCount() gibt die Anzahl der Zeilen
zurück, die von der letzten DELETE-, INSERT- oder UPDATE-Anweisung des
zugehörigen PDOStatement-Objekts betroffen waren.
Bei Anweisungen, die Ergebnismengen erzeugen, z. B.
SELECT, ist das Verhalten nicht definiert und kann je
nach Treiber unterschiedlich sein. Einige Datenbanken können die Anzahl der
von dieser Anweisung erzeugten Zeilen zurückgeben (z. B. MySQL im
gepufferten Modus), aber dieses Verhalten ist nicht für alle Datenbanken
garantiert und sollte nicht für portable Anwendungen verwendet werden.
Hinweis:
Diese Methode gibt beim SQLite-Treiber immer "0" (Null) zurück, beim PostgreSQL-Treiber nur dann, wenn das Statement-Attribut
PDO::ATTR_CURSORaufPDO::CURSOR_SCROLLgesetzt ist.
Diese Funktion besitzt keine Parameter.
Gibt die Anzahl der Zeilen zurück.
Gibt einen Fehler der Stufe E_WARNING aus, wenn das Attribut PDO::ATTR_ERRMODE
auf PDO::ERRMODE_WARNING gesetzt ist.
Löst eine PDOException aus, wenn das Attribut PDO::ATTR_ERRMODE
auf PDO::ERRMODE_EXCEPTION gesetzt ist.
Beispiel #1 Ermitteln der Anzahl der gelöschten Zeilen
PDOStatement::rowCount() gibt die Anzahl der Zeilen zurück, die von einer DELETE-, INSERT- oder UPDATE-Anweisung betroffen sind.
<?php
/* Löschen aller Zeilen aus der Tabelle FRUIT */
$del = $dbh->prepare('DELETE FROM fruit');
$del->execute();
/* Rückgabe der Anzahl der gelöschten Zeilen */
print "Rückgabe der Anzahl der gelöschten Zeilen:\n";
$count = $del->rowCount();
print "Es wurden $count Zeilen gelöscht.\n";
?>Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Rückgabe der Anzahl der gelöschten Zeilen: Es wurden 9 Zeilen gelöscht.
Beispiel #2 Zählen der Zeilen, die von einer SELECT-Anweisung zurückgegeben wurden
Bei den meisten Datenbanken gibt PDOStatement::rowCount() die Anzahl der von einer SELECT-Anweisung betroffenen Zeilen nicht zurück. Stattdessen sollte mittels PDO::query() eine SELECT COUNT(*)-Anweisung ausgeführt werden, die dieselben Bedingungen erfüllt wie die gewünschte SELECT-Anweisung. Mit PDOStatement::fetchColumn() kann dann die Anzahl der betroffenen Zeilen ermittelt werden.
<?php
$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
$res = $conn->query($sql);
$count = $res->fetchColumn();
print "Es gibt " . $count . " übereinstimmende Datensätze.";Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Es gibt 2 übereinstimmende Datensätze.
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, $p, array(PDO::MYSQL_ATTR_FOUND_ROWS => true));
?>
and rowCount() will tell you how many rows your update-query actually found/matched.Great, while using MySQL5, the only way to get the number of rows after doing a PDO SELECT query is to either execute a separate SELECT COUNT(*) query (or to do count($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.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.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';
}
?>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) $rs1->fetchColumn();
?>In some drivers rowCount() only works when using the prepare() with PDO::CURSOR_SCROLL
So, you can modify PDO class:
<?php
class myPDO extends PDO
{
function query($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%"));
?>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 0MySQL 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!";
}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..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;
?>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.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.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.