Question

我正在学习PHP（并且非常有趣）但是我遇到了CRUD应用程序中的一个问题，我似乎无法找到解决方法。

我需要在创建页面上使用下拉列表来输入数据。我还希望在更新页面上有相同的下拉列表，但当然这需要将值设置为加载更新表单时已存储在记录中的值。我手动编写了一些较短的下拉列表（见下文），但我接下来需要做的是2008年的记录！（它将在键入输入时进行搜索。）

我查看了有关数组等的多篇帖子，我可以通过下拉列表来列出这些值，但无法弄清楚如何提取现有值。

相关代码如下（请对编码温和......我是新的!!）：

<?php 
require_once "../includes/header.php";
?>

<?php
if ( isset($_POST['patient_id']) && isset($_POST['datadate'])
    && isset($_POST['bedspace']) && isset($_POST['episode_id']) ) {
$sql = "UPDATE tbl_users SET patient_id = :patient_id,
         datadate = :datadate, bedspace = :bedspace, isadmitday = :isadmitday, antimicrobial = :antimicrobial
        WHERE episode_id = :episode_id";
$stmt = $PDO->prepare($sql);
$stmt->execute(array(
    ':patient_id' => $_POST['patient_id'],
    ':datadate' => $_POST['datadate'],
    ':bedspace' => $_POST['bedspace'],
    ':episode_id' => $_POST['episode_id'],
    ':isadmitday' => $_POST['isadmitday'], 
    ':antimicrobial' => $_POST['antimicrobial']));
$_SESSION['success'] = '<div class="alert alert-success" role="alert"><strong>Record successfully updated</strong></div>';
header( 'Location: index.php' ) ;
return;
}
$stmt = $PDO->prepare("SELECT * FROM tbl_users where episode_id = :xyz");
$stmt->execute(array(":xyz" => $_GET['episode_id']));
$row = $stmt->fetch(PDO::FETCH_ASSOC);
if ( $row === false ) {
$_SESSION['error'] = '<div class="alert alert-danger" role="alert">    <strong>Unable to proceed - bad episode_id value</strong></div';
header( 'episode_id: index.php' ) ;
return;
}
$n = htmlentities($row['patient_id']);
$e = htmlentities($row['datadate']);
$l = htmlentities($row['bedspace']);
$i = htmlentities($row['isadmitday']);
$am = htmlentities($row['antimicrobial']);
$episode_id = htmlentities($row['episode_id']);
?>


    <div class="container">
        <div class="row">
            <div class="row">
                <div class="col-md-12">
                    <h2>Edit episode record</h2><br>
                </div> <!-- /col-md-12 -->
            </div> <!-- /row -->
        </div> <!-- /row -->

        <div class="row">
            <form name="edit_record" id="edit_record" method="POST" action="">
                <div class="form-group">
                    <label for="patient_id" control-label>Patient ID</label>
                    <input type="text" class="form-control" id="patient_id"     name="patient_id" value="<?= $n ?>">
                </div> <!-- /form-group -->

                <div class="form-group">
                    <label for="datadate" control-label>Date</label>
                    <input type="text" class="form-control" id="datadate" name="datadate" value="<?= $e ?>">
                </div>  <!-- /form-group -->

                <div class="form-group">
                    <label for="bedspace" control-label>Bedspace</label>
                    <select class="form-control" required="required" id="bedspace" name="bedspace" value="<?= $l ?>">
                        <option></option>
                        <option value="Side Ward 1" <?php echo $l == 'Side     Ward 1'?'selected':'';?>>Side Ward 1</option>
                        <option value="Bed 1" <?php echo $l == 'Bed   1'?'selected':'';?>>Bed 1</option>
                        <option value="Bed 2" <?php echo $l == 'Bed 2'?'selected':'';?>>Bed 2</option>
                        <option value="Bed 3" <?php echo $l == 'Bed 3'?'selected':'';?>>Bed 3</option>
                        <option value="Bed 4" <?php echo $l == 'Bed 4'?'selected':'';?>>Bed 4</option>
                        <option value="Bed 5" <?php echo $l == 'Bed 5'?'selected':'';?>>Bed 5</option>
                        <option value="Side Ward 2" <?php echo $l == 'Side Ward 2'?'selected':'';?>>Side Ward 2</option>
                        <option value="Side Ward 3" <?php echo $l == 'Side Ward 3'?'selected':'';?>>Side Ward 3</option>
                    </select>
                </div>  <!-- /form-group -->

Answer 1

好了经过几天密集的研究后，我的工作就像我想要的那样，虽然我确信我的解决方案并不漂亮！下拉列表是一种名为“抗菌药物”的抗生素药物清单。我使用SELECT语句从数据库中获取下拉列表，并且我匹配从另一个表中提取的值，以设置编辑记录时下拉列表的值。

以下代码来自edit.php文件：

 <?php
 if (isset($_POST['episode_id']) ) {
    $sql = "UPDATE tbl_users SET antimicrobial = :antimicrobial
        WHERE episode_id = :episode_id";
     $stmt=$PDO->prepare($sql);
    $stmt->execute(array(
        ':antimicrobial' => $_POST['antimicrobial']));
    $_SESSION['success'] = '<div class="alert alert-success" role="alert"><strong>Record successfully updated</strong></div>';
    header( 'Location: index.php' ) ;
return;
}

$stmt = $PDO->prepare("SELECT * FROM tbl_users where episode_id = :xyz");
$stmt->execute(array(":xyz" => $_GET['episode_id']));
$row = $stmt->fetch(PDO::FETCH_ASSOC);
    if ( $row === false ) {
        $_SESSION['error'] = '<div class="alert alert-danger" role="alert"><strong>Unable to proceed - bad episode_id value</strong></div';
        header( 'episode_id: index.php' ) ;
    return;
    }

$am = htmlentities($row['antimicrobial']);    
$episode_id = htmlentities($row['episode_id']);

?>
<div class="form-group">
    <label for="antimicrobial" control-label>Antimicrobial from database</label>
    <?php
         $sql_am = 'SELECT antimicrobial FROM tbl_antimicrobials';
         $stmt_am = $PDO->query($sql_am);
    ?>
    <select class="form-control" id="antimicrobial"></select>
    <?php
        while ($row = $stmt_am->fetch(PDO::FETCH_ASSOC)) 
        {
        $selected = ($row['antimicrobial'] == $am ) ? ' selected' : '';
        echo "<option value='" . $row['antimicrobial'] . "'" . $selected . ">" . $row['antimicrobial'] . "</option>";
        }
        echo '</select>';
    ?> 
</div> <!-- /form-group -->

PHP PDO从记录编辑表单中的大表填充下拉列表 - 从数据库中提取结果

1 个答案: