Question

这绝对是初学者的问题。有两个问题。即使我从表中删除行（我使用的是phpmyadmin），我的MYSQL表中的id（设置为autoincrement）也会继续上升。至于另一个问题，我似乎无法找到一种方法来处理用户最近输入的行。代码回显了MYSQL中的所有现有行。我加粗了最相关的代码部分。

<?php
//establish connection to mysql
$con = mysql_connect("localhost","root","");
if (!$con)
{
  die('Could not connect: ' . mysql_error());
}

/*retrieve user input from input form
and initialize variables */  
$Word1 = $_POST["Word1"];
$Word2 = $_POST["Word2"];
$Word3 = $_POST["Word3"];
$Word4 = $_POST["Word4"];
$Word5 = $_POST["Word5"];

//select db
mysql_select_db("madlibs", $con);  

//insert user input for word 1
$sql = "INSERT INTO test (Word1, Word2, Word3, Word4, Word5)
VALUES
('$Word1', '$Word2', '$Word3', '$Word4', '$Word5')";
if(!mysql_query($sql,$con))
{
  die('Error: ' . mysql_error());
}

$result = mysql_query ("SELECT * FROM test");  

/* take note here */
while($row = mysql_fetch_array($result))
{
  echo $row['Word1'] . " " . $row['Word2'] . " " . $row['Word3'] . " " . 
       $row['Word4'] . " " . $row['Word5'] . " " . $row['id'];
  echo "<br />";
} /* take note here */
mysql_close($con);
?>

Answer 1

$result = mysql_query ("SELECT * FROM test order by id desc limit 1");

关于你的id问题......这就是id的工作原理。他们没有填补空白。

旁注：永远不要将用户提交的数据直接放入查询字符串中。总是使用mysql_real_escape_string（）来逃避它们。

Answer 2

SELECT * FROM test ORDER BY Id DESC LIMIT 1

当我只想输出一行时，MYSQL / PHP输出整个表

2 个答案: