ID: 42619
Comment by: uwendel at mysql dot com
Reported By: lmanseau at claurendeau dot qc dot ca
Status: Open
Bug Type: MySQLi related
Operating System: Linux
PHP Version: 5.2.4
New Comment:
Stupid me, ... no bug, of course - wrong API usage.
Prepared Statements work with unbuffered result sets by default. PS
can't tell you how many rows there are in the result set before you
either have:
- stored the result set / turned it into a buffered result set
- fetched all data
You have neither called mysqli_stmt_store_result() nor fetched all
results before you call mysqli_stmt_num_rows(). Therefore,
mysqli_stmt_num_rows() returns 0, which is correct.
http://www.php.net/manual/en/function.mysqli-stmt-num-rows.php
"Returns the number of rows in the result set. The use of
mysqli_stmt_num_rows() depends on whether or not you used
mysqli_stmt_store_result() to buffer the entire result set in the
statement handle.
If you use mysqli_stmt_store_result(), mysqli_stmt_num_rows() may be
called immediately. "
See also
http://dev.mysql.com/doc/refman/5.1/en/mysql-stmt-num-rows.html
Previous Comments:
[2007-09-11 15:10:46] lmanseau at claurendeau dot qc dot ca
Here is the SQL definition:
CREATE TABLE test1 (
c1 int(4) unsigned zerofill NOT NULL auto_increment,
c2 varchar(10) default NULL,
c3 double(4,2) default NULL,
PRIMARY KEY (c1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Code with problem:
// Opening connection
include ('../mysql/param.inc');
$db = new mysqli($hote, $util, $mpas, $base);
if (!$db) {
echo "No connection!";
exit();
}
echo 'Non Prepared Request'; //WORK WELL
$sql = "select * from test1";
$rqp = $db->query($sql);
echo 'Rows = '.$rqp->num_rows.'';
echo 'Prepared Request'; //DON'T WORK
$sql = "select * from ch9books";
$rqp = $db->prepare($sql);
$rqp->execute();
echo 'Rows = '.$rqp->num_rows.'';
// Closing connection
$db->close();
And the results...
Non Prepared Request
Rows = 6
Prepared Request
Rows = 0
[2007-09-11 08:52:29] uwendel at mysql dot com
Please provide a reproducible test case, including SQL definitions and
"the other statements" you mention, if they are needed for a minimum
test case.
Thanks!
[2007-09-10 20:50:48] lmanseau at claurendeau dot qc dot ca
Description:
I try to execute a prepared statement with mysqli. I use PHP 5.2.0 with
MySQL 5.0.27
After some tests, prepared statements with MySQL instructions such as
(INSERT, DELETE and UPDATE) work very well.
The only case problem which I pointed out, it is the instruction SELECT
that does not seem to react of good manner
- SELECT * FROM table1 dont work
- SELECT C1, C2 FROM table1 - dont work
I have no error message!!!
Reproduce code:
---
$db = new mysqli($hote, $util, $mpas, $base);
if (!$db) {
echo "No connection with BD";
exit();
}
//WORK WELL
echo 'Non prepared statement';
$sql = "select * from ch9books";
$rqp = $db->query($sql);
echo 'books = '.$rqp->num_rows.'';
//DONT WORK
echo 'Prepared statement';
$sql = "select * from ch9books";
$rqp = $db->prepare($sql);
$rqp->execute();
echo 'books = '.$rqp->num_rows.'';
$rqp->close();
Expected result:
Non prepared statement
Books = 6
Actual result:
--
Prepared statement
Books = 0
--
Edit this bug report at http://bugs.php.net/?id=42619&edit=1
