If you have problems making work this num_rows, you have to declare ->store_result() first.
<?php
$mysqli = new mysqli("localhost","root", "", "tables");
$query = $mysqli->prepare("SELECT * FROM table1");
$query->execute();
$query->store_result();
$rows = $query->num_rows;
echo $rows;
// Return 4 for example
?>
mysqli_result::$num_rows
mysqli_num_rows
(PHP 5, PHP 7)
mysqli_result::$num_rows -- mysqli_num_rows — Gets the number of rows in a result
설명
객체 기반 형식
절차식 형식
Returns the number of rows in the result set.
The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. For unbuffered result sets, mysqli_num_rows() will not return the correct number of rows until all the rows in the result have been retrieved.
반환값
Returns number of rows in the result set.
Note:
If the number of rows is greater than
PHP_INT_MAX, the number will be returned as a string.
예제
Example #1 객체 기반 형식
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if ($result = $mysqli->query("SELECT Code, Name FROM Country ORDER BY Name")) {
/* determine number of rows result set */
$row_cnt = $result->num_rows;
printf("Result set has %d rows.\n", $row_cnt);
/* close result set */
$result->close();
}
/* close connection */
$mysqli->close();
?>
Example #2 절차식 형식
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if ($result = mysqli_query($link, "SELECT Code, Name FROM Country ORDER BY Name")) {
/* determine number of rows result set */
$row_cnt = mysqli_num_rows($result);
printf("Result set has %d rows.\n", $row_cnt);
/* close result set */
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
위 예제들의 출력:
Result set has 239 rows.
참고
- mysqli_affected_rows() - Gets the number of affected rows in a previous MySQL operation
- mysqli_store_result() - Transfers a result set from the last query
- mysqli_use_result() - Initiate a result set retrieval
- mysqli_query() - Performs a query on the database
add a note
User Contributed Notes 3 notes
borisigna ¶
13 years ago
min0u ¶
7 years ago
This function doesn't work with LIMIT used jointly with SQL_CALC_FOUND_ROWS. If you want to obtain the total rows found you must do it manually, example:
<?php
public function errorList(int $limit=25,int $offset=0){
$errorList = array();
$result = $this->con->query("SELECT SQL_CALC_FOUND_ROWS id, erreur FROM Erreurs ORDER BY id DESC LIMIT $limit OFFSET $offset");
while($row = $result->fetch_assoc()){
$errorList[] = new Erreur($row);
}
$result->free();
// $foundRows = $result->num_rows; // 25
$foundRows = $this->con->query("SELECT FOUND_ROWS() as foundRows");
$this->foundRows = $foundRows->fetch_assoc(); // 178
return $errorList;
}
?>
justso at inbox dot ru ¶
9 years ago
in php 5.3.8 had unexpected troubles when checking for mysqli_result::$num_rows
If the result of the query is empty then var_dump of the result will be like this:
class mysqli_result#5 (5) {
public $current_field => NULL
public $field_count => NULL
public $lengths => NULL
public $num_rows => NULL
public $type => NULL
}
but var_dump($result->num_rows) will give integer-typed zero instead of NULL:
int(0)
