php MySQL - 计算php中的总行数
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MySQL - count total number of rows in php
提问by CodeGuy
What is the best MySQL command to count the total number of rows in a table without any conditions applied to it? I'm doing this through php, so maybe there is a php function which does this for me? I don't know. Here is an example of my php:
在不应用任何条件的情况下，计算表中总行数的最佳 MySQL 命令是什么？我正在通过 php 执行此操作，所以也许有一个 php 函数可以为我执行此操作？我不知道。这是我的php的一个例子：
<?php
$con = mysql_connect("server.com","user","pswd");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("db", $con);
$result = mysql_query("some command");
$row = mysql_fetch_array($result);
mysql_close($con);
?>
回答by fdaines
<?php
$con = mysql_connect("server.com","user","pswd");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("db", $con);
$result = mysql_query("select count(1) FROM table");
$row = mysql_fetch_array($result);
$total = $row[0];
echo "Total rows: " . $total;
mysql_close($con);
?>
回答by Jules
Either use COUNT in your MySQL query or do a SELECT * FROM table and do:
在 MySQL 查询中使用 COUNT 或执行 SELECT * FROM 表并执行以下操作：
$result = mysql_query("SELECT * FROM table");
$rows = mysql_num_rows($result);
echo "There are " . $rows . " rows in my table.";
回答by Shridhar
you can do it only in one line as below:
您只能在一行中完成，如下所示：
$cnt = mysql_num_rows(mysql_query("SELECT COUNT(1) FROM TABLE"));
echo $cnt;
回答by Jon Gauthier
回答by chobela
mysqli_num_rowsis used in php 5 and above.
mysqli_num_rows在 php 5 及以上版本中使用。
e.g
例如
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
printf("Result set has %d rows.\n",$rowcount);
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
回答by Amirhosein jaafari
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
echo "number of rows: ",$rowcount;
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
it is best way (I think) to get the number of special row in mysql with php.
这是（我认为）使用 php 获取 mysql 中特殊行数的最佳方法。
回答by Asesha George
for PHP 5.3 using PDO
对于使用 PDO 的 PHP 5.3
<?php
$staff=$dbh->prepare("SELECT count(*) FROM staff_login");
$staff->execute();
$staffrow = $staff->fetch(PDO::FETCH_NUM);
$staffcount = $staffrow[0];
echo $staffcount;
?>
回答by Divyasundar Sahu
<?php
$conn=mysqli_connect("127.0.0.1:3306","root","","admin");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="select count('user_id') from login_user";
$result=mysqli_query($conn,$sql);
$row=mysqli_fetch_array($result);
echo "$row[0]";
mysqli_close($conn);
?>
Still having problem visit my tutorial http://www.studentstutorial.com/php/php-count-rows.php
仍然有问题访问我的教程http://www.studentstutorial.com/php/php-count-rows.php
回答by Toki
use num_rows to get correct count for queries with conditions
使用 num_rows 获取带条件查询的正确计数
$result = $connect->query("select * from table where id='$iid'");
$count=$result->num_rows;
echo "$count";
回答by Trevor
$sql = "select count(column_name) as count from table";
