通过pdo代码填充下拉菜单 - populating dropdown menu through pdo code

populating dropdown menu through pdo code

我刚刚开始使用PDO，但我正在慢慢掌握它的窍门。我想知道如何使下拉菜单或列表框填充数据到页面上的字段。我已经开始查找PDO指南等代码，但我很难找到解决方案。我也为不整洁的代码感到抱歉，但我再次对整个编程场景感到陌生。

提前感谢。这是我的代码到目前为止:下面是连接字符串:

<?php
    session_start();
    if(!isset($_SESSION["user_id"])){
        header("location:../Pages/login.html");
    }

    //databse connection Sting
    $connection = new PDO("sqlsrv:server=servername;Database=databasename", "username",                     "password"); 
    //insertion function
    $smt = $connection->prepare('select exam_id From exam');

?>

这也包括我的会话cookie，但这工作得很好。这是我目前为止的下拉框的总体。

 <select name="lst_exam" id="lst_exam">
       <?php
            $smt->execute();
            while ($row = $smt->fetch()){
                echo "<option>" . $row["exam_id"] . "</option>";
            }
            $connection = null;
        if(isset($_POST["lst_exam"]));  
        ?>
    </select>

我试图填充的文本框是txt_exam_id, txt_location, txt_date_taken, txt_exam_taken, txt_grade_received

答案很简单:不要通过pdo代码填充下拉菜单

这是完全不同的事情，不应该在代码中混合。

把你的代码分成两部分:

PDO代码/gh>
从传统的数组代码中填充任何菜单。

分别编写和调试这些部分。

$smt = $connection->prepare('select exam_id From exam');
$smt->execute();
$data = $smt->fetchAll();

现在您已经将考试存储在$data数组中。

<select name="lst_exam" id="lst_exam">
<?php foreach ($data as $row): ?>
    <option><?=$row["exam_id"]?></option>
<?php endforeach ?>
</select>

    //USING PDO   
 $ID=trim($_GET['id']);
    $result = $DB_con->prepare("select userID, firstName, lastName, gender, telNo, userEmail, userName, contactAddress, case when userStatus = 'Y' then 'TRUE' ELSE 'FALSE' end as userStatus, case when state = 1 then 'ACTIVE' else 'IN-ACTIVE' end as state, department.name as department from users JOIN department on department.id = users.department where userID=:get_header LIMIT 1");
    $result->execute(array(":get_header"=>$ID));
    $result->execute();
    for($i=0; $row = $result->fetch(); $i++){
    $id=$row['userID'];
    ?>
    $sql_g = "Select id, name from gender";
    $gend = $DB_con->prepare($sql_g);
    //Execute the statement.
    $gend->execute();
    //Retrieve the rows using fetchAll.
    $gend_lists = $gend->fetchAll(PDO::FETCH_ASSOC);

     //HTML AND PHP
    <div class="col-sm-3">
          <div class="form-group">
              <label class="control-label">Gender</label>
                 <?php $value = $row["gender"]; ?>
                 <select name="gender_test" class="form-control">
                      <?php foreach($gend_lists as $id => $option) { ?>
                        <option value="<?php echo $id["id"] ?>"<?php
                      if($id["id"] == $value) {
                  echo " selected";
             } ?>><?php echo $option["name"] ?></option>
          <?php } ?>
       </select>
     </div><!-- form-group -->
</div><!-- col-sm-6 -->