mysqli_num_rows

Gets the number of rows in a result (PHP 5)
int mysqli_num_rows ( mysqli result )

Procedural style:

Object oriented style (property):

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mysqli_result {
  int num_rows ;
}

Returns the number of rows in the result set.

The use of mysqli_num_rows() depends on whether you use buffered or unbuffered result sets. In case you use unbuffered resultsets mysqli_num_rows() will not correct the correct number of rows until all the rows in the result have been retrieved.

返回值

Returns number of rows in the result set.

注意:

If the number of rows is greater than maximal int value, the number will be returned as a string.

参见

mysqli_affected_rows(), mysqli_store_result(), mysqli_use_result() 和 mysqli_query().

范例

例 1309. Object oriented style

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<?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();
?>

例 1310. Procedural style

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<?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);
?>

上例将输出：

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Result set has 239 rows.