Question

我是PHP的新手，我坚持使用最后一段代码。它出现了以下错误，我不知道如何解决它。

PDOStatement类的对象无法转换为字符串第70行/home/e0753906/public_html/test4.php

一旦从下拉列表中选择了所选日期，我就会尝试将数据库中的数据显示在表格中。下拉列表中选择的日期必须是WHERE子句中的日期。

我的php文件如下所示：

<?php
// set up database global variables
        $servername = "localhost";
        $username = "e0753906_Sam";
        $password = "Tamara1623";

//connect to the database           
try {
  $conn = new PDO("mysql:host=" . $GLOBALS['servername'] . 
  ";dbname=e0753906_OaktownFootball", $GLOBALS['username'], 
  $GLOBALS['password']);
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
   }
  catch(PDOException $e) {
      echo "An error occured: " . $e->getMessage();
}

// global variables
$query = $conn->query('SELECT DISTINCT `Date` FROM Fixtures');

$data = $conn->query('SELECT * FROM Fixtures'); 

$test = $conn->query('SELECT * FROM Fixtures WHERE `Date`=20160709');   

$data_s = $conn->query('SELECT Date, 
                      (SELECT Team_Name FROM Teams WHERE Teams.Team_ID = 
                      Home_team.Team_ID) As Home_Team,
                      (SELECT Team_Name FROM Teams WHERE Teams.Team_ID = 
                      Away_team.Team_ID) As Away_Team,
                        Home_Score,
                        Away_Score
                        FROM Fixtures
                        JOIN Home_team ON Home_team.Home_Team_ID = 
                        Fixtures.Home_Team_ID
                        JOIN Away_team ON Away_team.Away_Team_ID = 
                        Fixtures.Away_Team_ID');

?>

<html>
  <head>
    <title>Oaktown Football Club</title>
 </head>
 <body>

<form action="test2.php" method="get">
  <select name="Date">
    <option>Choose a date</option>
        <?php foreach ($query->fetchAll() as $Fixtures):?>
            <option name="Date" value="<?php echo $Fixtures['Date'];?>">
            <?php echo $Fixtures['Date'];?></option>
        <?php endforeach; ?>
  </select>
  <input type="submit" value="Show details">
</form>
<?php
echo "<table border=1>
        <tr>
            <th>Date</th>
            <th>Home Team</th>
            <th>Away Team</th>
            <th>Score</th>
        </tr>" ;
         if (isset($_GET['Date'])) {

                    ob_start();
                    echo $_GET['Date']; 
                    $datetest = ob_get_contents();

                    $fixture = "
                    {$data_s}
                    WHERE `Date` = ' . $datatest . '";

                    while($records = $fixture->fetch()) {
                        echo "<tr>";
                        echo "<td>" . $records['Date'] . "</td>";
                        echo "<td>" . $records['Home_Team'] . "</td>";
                        echo "<td>" . $records['Away_Team'] . "</td>";
                        echo "<td>" . $records['Home_Score'] . "-" . 
                        $records['Away_Score'] . "</td>";
                        echo "</tr>";} 
} 
echo "</table>" ?>

</body>

由于

我也试过

//Get data from date    
if (isset($_GET['Date'])) {
    $dateQuery = "
    {$data}
    WHERE `Date` = :date";

$date = $conn->prepare($dateQuery);

$date->execute(['date'=>$_GET['Date']]);


$selectedDate = $date->fetch(POD::FETCH_ASSOC);

var_dump($selectedDate);};

Answer 1

设置$data_s时，这是执行查询的结果，所以在行中..

            $fixture = "
            {$data_s}
            WHERE `Date` = ' . $datatest . '";

您尝试将执行查询的结果添加到字符串中。我认为您只是尝试在此声明的末尾添加WHERE子句，我认为您只需将$data_s设置为...

$data_s = 'SELECT Date,
                      (SELECT Team_Name FROM Teams WHERE Teams.Team_ID =
                      Home_team.Team_ID) As Home_Team,
                      (SELECT Team_Name FROM Teams WHERE Teams.Team_ID =
                      Away_team.Team_ID) As Away_Team,
                        Home_Score,
                        Away_Score
                        FROM Fixtures
                        JOIN Home_team ON Home_team.Home_Team_ID =
                        Fixtures.Home_Team_ID
                        JOIN Away_team ON Away_team.Away_Team_ID =
                        Fixtures.Away_Team_ID';

但我也不确定......

            ob_start();
            echo $_GET['Date']; 
            $datetest = ob_get_contents();

你可以删除它，只需使用...

            $fixture = "
            {$data_s}
            WHERE `Date` = ' . $_GET['Date'] . '";

<强>更新由于现在不执行查询，您需要在此处执行...

    $fixture = $conn->query("{$data_s}
        WHERE `Date` = '".$_GET['Date']}."'");
    if ( $fixture === false ) {
       die ($conn->error);
    }

PDOStatement类的对象无法转换为字符串 - 获取动态显示数据的下拉列表

1 个答案: