Question

这里是代码我试图显示数据库中的所有数据......

$sql = mysql_query("SELECT * FROM data ORDER BY id DESC");
$row1 = mysql_fetch_array($sql);
print_R($row1);

但它只显示一行..我在数据库中共有三行，如果我在数据库中运行相同的查询，它会显示所有行.. 我想显示所有三行如何解决这个问题？

Answer 1

由于您需要多行，因此需要使用while：

循环它们

$sql = mysql_query("SELECT * FROM data ORDER BY id DESC");
while($row1 = mysql_fetch_assoc($sql)) {
    echo $row1['column_name'];
}

强制性注释：

Please, don't use mysql_* functions in new code。它们不再被维护and are officially deprecated。请参阅red box？转而了解prepared statements，并使用PDO或MySQLi - this article将帮助您确定哪个。如果您选择PDO here is a good tutorial。

这是一个来自PDO对手的简单示例：

$con = new PDO('mysql:host=localhost;dbname=database_name', 'username', 'password'); // simple connection
$query = $con->query('SELECT * FROM data ORDER BY id DESC'); // put your query here
while($row = $query->fetch(PDO::FETCH_ASSOC)) { // same concept, you need to fetch them and put them inside the while loop since you're expecting multiple rows
    echo $row['column_name'];
}

基本上第一个答案是可行的但是我建议你放弃那个弃用的API并开始使用PDO。不用担心，学习此API时不会缺少资源。

Answer 2

尝试while循环

$sql = mysql_query("SELECT * FROM data ORDER BY id DESC");
while($row = mysql_fetch_array($sql))
{
  print_r($row);
}

Answer 3

你需要循环你的查询，

$sql = mysql_query("SELECT * FROM data ORDER BY id DESC");
$row1 = mysql_fetch_array($sql);
print_R($row1);

//错误的

使用mysqli，

$con=mysqli_connect("localhost","my_user","my_password","my_db");

//检查连接

if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

//执行查询

      $sql = mysqli_query($con,"SELECT * FROM data ORDER BY id DESC");
        $mainarr=array();    
    while($row = mysql_fetch_assoc($sql)) {
        $subarr=array();
        $subarr['key']=$row['your field'];
        array_push($mainarr,$subarr);
    }  
print_r($mainarr);

Answer 4

简单易用的mysqli只需尝试以下一次

$mysqli   = new mysqli("localhost", "username", "password", "database");
$strr     = "SELECT * FROM data ORDER BY id DESC";  // its a good practice to use column name insted of *
$result   = $mysqli->query($strr);
while($arr      = $result->fetch_array())
{
  print_r($arr);
}

PHP不显示所有行

4 个答案: