PHP检查MySQL最后一行 - PHP Check MySQL Last Row

PHP Check MySQL Last Row

本文关键字：一行检查 MySQL 最后 PHP | 更新日期: 2023-09-27

我有一个关于PHP的简单问题，要检查这是否是MySQL的最后一行。例如，我有这样的代码：

$result = mysql_query("SELECT *SOMETHING* ");
while($row = mysql_fetch_array($result))
{
if (*this is the last row*)
{/* Do Something Here*/}
else
{/* Do Another Thing Here*/}
}

我很难判断这一排是否是最后一排。知道怎么做吗？谢谢

您可以在while循环之前使用mysqli_num_rows()，然后将该值用于您的条件：

$numResults = mysqli_num_rows($result);
$counter = 0
while ($row = mysqli_fetch_array($result)) {
    if (++$counter == $numResults) {
        // last row
    } else {
        // not last row
    }
}

$result = mysql_query("SELECT *SOMETHING* ");
$i = 1;
$allRows = mysql_num_rows($result);
while($row = mysql_fetch_array($result)){
    if ($allRows == $i) {
        /* Do Something Here*/
    } else {
        /* Do Another Thing Here*/}
    }
    $i++;
}

但请考虑PDO

$db = new PDO('mysql:host=localhost;dbname=testdb', 'username', 'password');
$stmt = $db->query("SELECT * FROM table");
$allRows = $stmt->rowCount();
$i = 1;
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    if ($allRows == $i) {
        /* Do Something Here*/
    } else {
        /* Do Another Thing Here*/}
    }
    $i++;
}

$allRows = $stmt->rowCount();

对我不起作用，必须使用：

$numResults = $result->num_rows;

试试这个：

$result = mysql_query("SELECT colum_name, COUNT(*) AS `count` FROM table");
$i = 0;
while($row = mysql_fetch_assoc($result))
{
    $i++;
    if($i == $row['count'])
    {
        echo 'last row';
    }
    else
    {
        echo 'not last row';
    }
}

尝试在while循环中设置一个计数器，然后根据mysql_num_rows() 进行检查

$result = //array from the result of sql query.
$key = 1000; 
$row_count = count($result); 
if($key)
{
    if($key == $row_count-1)  //array start from 0, so we need to subtract.
    {
       echo "Last row";             
    }
    else
    {
       echo "Still rows are there";             
    }
}