Question

如何使用变量选择字段。我想在基础栏（Seriennummer，MacAdresse）中选择字段（Seriennummer）。

我需要选择meta_key列和meta_value，其中变量$ result等于meta_key。

感谢大家的帮助。

我总是收到错误

捕获致命错误：无法将类stdClass的对象转换为\ wp-content \ plugins \ woocommerce \ templates \ checkout \ thankyou.php中的字符串

＆＃13;

$result = wpuef_get_field('c2');
$value=$result->value;
echo $value,"<br>";
//Sql
$link = mysqli_connect("localhost", "root", "", "paymentdb");
 
// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
 
// Attempt select query execution
$sql = "SELECT Seriennummer, MacAdresse FROM set_top_box WHERE Seriennummer ='".$result."'";
if($result = mysqli_query($link, $sql)){
    if(mysqli_num_rows($result) > 0){
        echo "<table>";
            echo "<tr>";
                echo "<th>Seriennummer</th>";
                echo "<th>MacAdresse</th>";
            echo "</tr>";
        while($row = mysqli_fetch_array($result)){
            echo "<tr>";
                echo "<td>" . $row['Seriennummer'] . "</td>";
                echo "<td>" . $row['MacAdresse'] . "</td>";
            echo "</tr>";
        }
        echo "</table>";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
// Close connection
mysqli_close($link);

＆＃13;

database picture

Answer 1

这是结果

＆＃13;

$result = wpuef_get_field('c2');
$value=$result->value;
echo $value,"<br>";
//Sql
$link = mysqli_connect("localhost", "root", "", "paymentdb");
 
// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
 
// Attempt select query execution
$sql = "SELECT Seriennummer, MacAdresse FROM set_top_box WHERE Seriennummer ='".$value=$result->value."'";
if($result = mysqli_query($link, $sql)){
    if(mysqli_num_rows($result) > 0){
        echo "<table>";
            echo "<tr>";
                echo "<th>Seriennummer</th>";
                echo "<th>MacAdresse</th>";
            echo "</tr>";
        while($row = mysqli_fetch_array($result)){
            echo "<tr>";
                echo "<td>" . $row['Seriennummer'] . "</td>";
                echo "<td>" . $row['MacAdresse'] . "</td>";
            echo "</tr>";
        }
        echo "</table>";
        // Free result set
        mysqli_free_result($result);
    } else{
        echo "No records matching your query were found.";
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);

＆＃13;

使用变量PHP选择字段

1 个答案: