Question

我正在尝试让我的PHP脚本以简洁的顺序打印我数据库中的所有行。目前我没有得到任何东西。我的表有4列，Name，Address，Long和Lat，以及2行数据。该表称为位置。我使用以下代码，但我没有开始工作：

<?php

$con=mysqli_connect("localhost","user","pass","db");

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

$sql = "SELECT * FROM `Locations` ";

if ($result = mysqli_query($con, $sql))
{
 $resultArray = array();
 $tempArray = array();

 while($row = $result->fetch_object())
 {
  $tempArray = $row;
     array_push($resultArray, $tempArray);
 }

 echo json_encode($resultArray);
}

// Close connections
mysqli_close($con);
?>

Answer 1

这是一个使用pdo而不是mysqli

的简单示例

<select id="xxx" name="xxx">
  <option value="">Choose a car</option>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

你可以使用像这样的for循环来回显数据并自己格式化

    $dbHOST = 'localhost';
    $dbNAME = 'nilssoderstrom_';
    $dbUSER = 'nilssoderstrom_';
    $dbPASS = 'Durandal82!';
    $pdo = new PDO('mysql:host=' . $dbHOST . ';dbname=' . $dbNAME, $dbUSER, $dbPASS); // create connection

    $stmt = $pdo->prepare("SELECT Name, Address, Long, Lat FROM Locations");
    //you should never use *, just call each field name you are going to use

    $stmt->execute(); // run the statement
    $arr = $stmt->fetchAll(PDO::FETCH_ASSOC); // fetch the rows and put into associative array

    print_r($arr); // print all array items, unformatted

如果名称正确，则会显示您的行ID和行CITY。只需将名称更改为您的字段名称即可。如果您需要进一步的帮助，请随时提出。

但是，如果您想坚持使用mysqli，请将以下代码添加为wirl。

    for($i=0; $i<sizeof($arr); $i++) { // this will loop through each row in the database. i prefer this method over while loops as testing has shown this is much faster for large scale tables
        echo 'Name: ' . $arr[$i]['Name'] . '<br />'; // $arr is the array name, $i is the number of the array item, or iterator, ['Name'] is the field name
        echo 'Address: ' . $arr[$i]['Address'] . '<br>';
        echo 'Long: ' . $arr[$i]['Long'] . '<br>';
        echo 'Lat: ' . $arr[$i]['Lat'] . '<br>';
    }

将fieldname更改为您要显示的字段

编辑：粘贴以下代码。它将回显行数。这将告诉您查询语句是否正确。

    $dbHOST = 'localhost';
    $dbNAME = 'nilssoderstrom_';
    $dbUSER = 'nilssoderstrom_';
    $dbPASS = 'Durandal82!';
    $mysqli = mysqli_connect($dbHOST, $dbUSER, $dbPASS, $dbNAME);
    $query = "SELECT Name, Address, Long, Lat FROM Locations";
    $result = mysqli_query($mysqli, $query);

    if($result) {
        while($row = mysqli_fetch_assoc($result)) {
            echo 'Name: ' . $row['Name'] . '<br />';
            echo 'Address: ' . $row['Address'] . '<br>';
            echo 'Long: ' . $row['Long'] . '<br>';
            echo 'Lat: ' . $row['Lat'] . '<br>';    
        }
    }

Answer 2

以关联数组的形式获取查询结果，并使用每个结果打印所有结果

 <?php

$con=mysqli_connect("localhost","user","pass","db");

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

$sql = "SELECT * FROM `Locations` ";

if ($result = mysqli_query($con, $sql))
{
while($rows = mysqli_fetch_assoc($result)) {     
      foreach($rows as $key => $val)
{
     echo $val;
}      
}
}

mysqli_close($con);
?>

PHP SQL查询在网页中打印结果

2 个答案: