Question

我有一个关于PHP的简单问题，以检查这是否是MySQL的最后一行。例如，我有这段代码：

$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*/}
}

我很难检查该行是否是最后一行。知道怎么做吗？感谢。

Answer 1

您可以在while循环之前使用mysql_num_rows()，然后根据您的条件使用该值：

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

Answer 2

$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++;
}

Answer 3

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';
    }
}

Answer 4

import os
    directoryname="C:\\Users\\Ineke\\Documents\\Python Scripts\\images"
    lijstmetfiles = os.listdir(directoryname)
    for i in range(len(lijstmetfiles)):
        os.rename(str(lijstmetfiles[i]), str("doggy"+str(i))

没有为我工作，不得不使用：

$allRows = $stmt->rowCount();

Answer 5

尝试在while循环中使用计数器，然后针对mysql_num_rows()

进行检查

Answer 6

$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";             
    }
}

PHP检查MySQL最后一行

6 个答案: