当表有数据时，PHP MySQL查询返回零结果

Question

当表格有10行时，我的PHP查询返回零结果。实际显示的是PHP表格格式代码的一部分。

实际输出：

0) { // output data of each row while($row = mysql_fetch_assoc($result)) { echo "in: " . $row["in"]. " - Name: " . $row["Name"]. " - Email: " . $row["Email"]. " 
"; } } else { echo "0 re 
sults"; } mysql_close($conn);? 

HTML/PHP代码：

<div class="about-text"> 

<?php 
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "db"; 

// Create connection 
$conn = mysql_connect($servername, $username, $password, $dbname); 
// Check connection 
if (!$conn) { 
    die("Connection failed: " . mysql_connect_error()); 
} 

$sql = "SELECT * FROM tablename"; 
$result = mysql_query($conn, $sql); 

if (mysql_num_rows($result) > 0) { 
    // output data of each row 
    while($row = mysql_fetch_assoc($result)) { 
     echo "in: " . $row["in"]. " - Name: " . $row["Name"]. " - Email: " . $row["Email"]. "<br>"; 
    } 
} else { 
    echo "0 results"; 
} 

mysql_close($conn); 
?> 

</div> 

Answer 1

http://php.net/manual/en/function.mysql-query.php

与

取代

$result = mysql_query($conn, $sql); 

$result = mysql_query($sql, $conn); 

Answer 2

传递连接资源/实例作为第一个参数是mysqli extension，你应该使用它的风格，而不是通过资源作为第二个参数（可选） - 这是多么老，现在deprecated mysql_* extension做它。 mysql_ *将会是be removed with the upcoming php version 7。

<?php 
$mysqli = mysqli_connect('localhost', 'root', '', 'db'); 
if ($mysqli->connect_errno) { 
    die("Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error); 
} 

$sql = "SELECT `in`,`Name`,`Email` FROM tablename"; 
$result = mysqli_query($mysqli, $sql); 
if (!$result) { 
    die('query failed: '.$mysqli->error); 
} 

$row = mysqli_fetch_array($result); 
if (!$row) { 
    echo '0 results'; 
} 
else { 
    do { 
     echo "in: " . $row["in"]. " - Name: " . $row["Name"]. " - Email: " . $row["Email"]. "<br>\r\n"; 
    } 
    while(NULL!=($row=mysqli_fetch_array($result))); 
} 

Answer 3

可以使用mysqli extension

<?php 
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "your_db"; 
// Create connection 
$conn = mysqli_connect($servername, $username, $password, $dbname); 
// Check connection 
if (!$conn) { 
    die("Connection failed: " . mysqli_connect_error()); 
} 
$sql = "SELECT * FROM mytable"; 
$result = mysqli_query($conn, $sql); 
if (mysqli_num_rows($result) > 0) { 
// output data of each row 
    while($row = mysqli_fetch_assoc($result)) { 
     echo "in: " . $row["id"]. " - Name: " . $row["Name"]. " - Email: " . $row["Email"]. "<br>"; 
    } 
} else { 
    echo "0 results"; 
} 
mysqli_close($conn); 
?> 

Answer 4

试试这个代码。这是您的confic.php文件：

<?php 
$hostname = "localhost"; 
$username = "root"; 
$password = ""; 
$dbname = "database_name"; 

$connection = mysql_connect($hostname, $username, $password, $dbname); 

if (!$connection) { 

    die('Could not connect: ' . mysql_error()); 
} 

做出新的PHP文件，包括您的配置文件：

<?php 
include('config.php'); 
$sql = "SELECT * FROM table_name"; 
$result = mysql_query($sql); 

if (mysql_num_rows($result) > 0) { 

    while($row = mysql_fetch_assoc($result)) { 

     ?> 
      <div class="about-text"> 
       <?php 
        echo "In: ".$row["in"]."Name: ". $row['Name'].","."Email: ".$row['Email']."</br>"; 
       ?> 
      </div> 
     <?php 
    } 
}else{ 
    echo "There is no Result!!!!"; 
} 
mysql_close($connection); 

我认为这会帮助你。