Php/docs/mysqli-result.num-rows
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
说明
面向对象风格
int $mysqli_result->num_rows;
过程化风格
mysqli_num_rows
( mysqli_result $result
) : int
Returns the number of rows in the result set.
The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. For unbuffered result sets, mysqli_num_rows() will not return the correct number of rows until all the rows in the result have been retrieved.
返回值
Returns number of rows in the result set.
Note:
If the number of rows is greater than
PHP_INT_MAX, the number will be returned as a string.
范例
Example #1 面向对象风格
<?php$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 过程化风格
<?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);?>
以上例程会输出：
Result set has 239 rows.
参见
- mysqli_affected_rows() - Gets the number of affected rows in a previous MySQL operation
- mysqli_store_result() - 转移上一次查询返回的结果集
- mysqli_use_result() - Initiate a result set retrieval
- mysqli_query() - 对数据库执行一次查询
