PHP 5.6.4 is available

PDOStatement::rowCount

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

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

Description

public int PDOStatement::rowCount ( void )

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.

Return Values

Returns the number of rows.

Examples

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");
?>

The above example will output:

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 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->fetchColumn() > 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;
?>

The above example will output:

apple
banana
orange
pear

See Also

add a note add a note

User Contributed Notes 11 notes

up
15
Daniel Karp
2 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
23
Matt
7 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
12
Ome Ko
3 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
6
user at nospam dot example dot com
1 year 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
9
gunnrosebutpeace at gmail dot com
6 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
10
leandro at marquesini dot com
2 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
1
sERGE-01
1 year 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
0
phpnet at maya-control dot ro
8 months ago
Yet another workaround to return the row count inside only ONE select (see limitations below!):

$sth = $dbh->prepare("SELECT *,count(*) AS howmany FROM users WHERE email=:email and password=:pass"); #var placeholders
$sth->execute(array(':email'=>$email, ':pass'=>$pass)); #var binding
$row = $sth->fetch(); #get one row (it'll always be one and only one!!!)

if ($row['howmany'] == 1){ #we have a match and only one! cool!
    echo $row['email'], $row['name'], $row['phone'], ... ;
} elseif ($row['howmany']>1) { #more than one row returned
    #one programmer should be fired 'cause he's not checking for
    #for existing emails, before creating a new user
    ...
    # treat this exception somehow or simply skip this branch,
    # if you're sure it won't happen in your table
} else { #no match in the table ($row['howmany'] == 0)
    echo "Email/pass didn't match the ones in the database!";
}

Advantages:
- only one select statement is executed, no two steps needed!
- it checks if one row exists in the table or not, according to the WHERE clause.
- it returns all (or only a selection of) fields for that one row, if exists.

Disadvantages:
- it doesn't return row fields reliable if more than one row found. If more than one row responds to the SELECT query, the query returns still only one row and you don't know which one exactly .
Maybe using a SORT BY, would make it a bit more predictible (as in: "if more than one users found, return the last user added in the table") but it's more a matter of good design of the program that fills in the table initially.

Uses:
- It is perfect for checking if a user/pass pair is present in a users table and to return the other fields of the user (like name, phone, whatever) if user was found.
up
-2
e dot sand at elisand dot com
6 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
e dot sand at elisand dot com
6 years ago
My rowCount() workaround & how it's used:

<?php
class MyPDO extends PDO {
    private
$queryString;

    public function
query(/* ... */) {
       
$args = func_get_args();
       
$this->queryString = func_get_arg(0);

        return
call_user_func_array(array(&$this, 'parent::query'), $args);
    }

    public function
rowCount() {
       
$regex = '/^SELECT\s+(?:ALL\s+|DISTINCT\s+)?(?:.*?)\s+FROM\s+(.*)$/i';
        if (
preg_match($regex, $this->queryString, $output) > 0) {
           
$stmt = parent::query("SELECT COUNT(*) FROM {$output[1]}", PDO::FETCH_NUM);

            return
$stmt->fetchColumn();
        }

        return
false;
    }
}

$pdo = new MyPDO("sqlite::memory:");
$result = $pdo->query("SELECT row1, row2 FROM table WHERE something = 5");

if (
$pdo->rowCount() > 0) {
    echo
"{$result['row1']}, {$result['row2']}";
}
?>
up
-16
dcahh at gmx dot de
3 years ago
It's pretty obvious, but might save one or the other from bug tracking...

Alltough rowCount ist returned by the statement, one has to execute the statement before rowCount returns any results...

Does not work
<?php
    $statement
= $dbh->prepare('SELECT FROM fruit');
   
$count = $statement->rowCount();
?>

Works
<?php
    $statement
= $dbh->prepare('SELECT FROM fruit');
   
$statement->execute();
   
$count = $statement->rowCount();
?>
To Top