Question

我无法使用于更新才能正常工作的代码就像$ _GET方法不起作用

一切正常，我可以删除并在数据库中插入，但是我无法更新，当将提交按钮的值更改为可编辑并单击它时，它不执行更新语句，而是执行插入语句

           <?php 


     $sql = "SELECT * FROM brand ORDER BY brand";
     $stmt = $con->prepare($sql);
     $stmt->execute();
     $datarows = $stmt->fetchAll(PDO::FETCH_ASSOC);

     if(isset($_GET['delete']) && !empty($_GET['delete'])) {

        $deleteid = (int)$_GET['delete'];

        $sql = "DELETE FROM brand WHERE Bra_ID = ?";
        $stmt = $con->prepare($sql);
        $stmt->execute(array($deleteid));
        header("Location: brands.php");
        exit();
     }

     if (isset($_GET['edit']) && !empty($_GET['edit'])) {

        $editid = (int)$_GET['edit'];

        $sql = "SELECT * FROM brand WHERE Bra_ID = ?";
        $stmt = $con->prepare($sql);
        $stmt->execute(array($editid));
        $brandsrows = $stmt->fetchAll();
    } 

     if (isset($_POST['submit']) ) {

        $brand = sanitize($_POST['brand']);
        $errors = array();

        if (empty($brand)) {
             $errors[] = "Please Enter Brand Name";

        }

        $sql = "SELECT * FROM brand WHERE brand = '$brand'";

        if (isset($_GET['edit'])) {  //This not working work
            $sql = "SELECT * FROM brand WHERE brand = '$brand' AND 
                         Bra_ID != '$editid'";
        }

        $stmt = $con->prepare($sql);
        $stmt->execute();
        $count = $stmt->rowCount();

        if($count > 0) {  
               $errors[] = $brand . " Brand Already Exists";    
        } 

        if (!empty($errors)) {
             echo displayErrors($errors);

        } else {

            if (isset($_GET['edit'])) { //This not working work
            $sql = "UPDATE brand SET brand = '''$brand' WHERE 
                    Bra_ID='$editid'";
            }

            $sql = "INSERT INTO brand(brand) VALUES('$brand')";

            $stmt = $con->prepare($sql);
            $stmt->execute();
            header("Location: brands.php");
            exit();
        }

     } 
        ?>
          <div class="container-fluid" style="height: 750px">
              <h1 class="text-center my-3">Brands Area</h1>
           <hr> 

           <div class="brand-add">
             <form action="brands.php" method="POST" class="form-inline">
                <label for=""><?=(isset($_GET['edit'])?'Brand To Edit: 
                  ':'Brand Name: ')?></label>
        <?php
            $brandName ='';
            if (isset($_GET['edit'])) {
                $brandName = $brandsrows[0]['brand'];
            } else {
                if (isset($_POST['submit'])) {
                    $brandName = $_POST['brand'];
                }
            }
        ?>
             <input type="text" class="form-control mx-2" name="brand" 
                 value="<?=$brandName?>">
          <?php 
        if (isset($_GET['edit'])) {
                ?>
         <a href="brands.php" class="btn btn-outline-secondary mr-1">Cancel</a>
                <?php
        }
        ?>
           <input type="submit" name="submit" class="btn btn-success" 
             value="<?=(isset($_GET['edit'])?'Edit':'Add')?> New Brand">
          </form>
        </div>   
          <hr>
        <table class="table table-bordered width-auto table-condensed">
            <thead>
             <tr>
               <th scope="col"></th>
               <th scope="col">Brands</th>
               <th scope="col"></th>
            </tr>
          </thead>
          <tbody>

      <?php 

        foreach ($datarows as $rows) {

       ?>
          <tr>
            <td>
              <a href="brands.php?edit=<?php echo $rows['Bra_ID'] ?>" 
                class="btn btn-success"> <i class="far fa-edit"></i>
             </a>
           </td>
         <td class="text-primary font-weight-bold"><?php echo $rows['brand'] ?> 
       </td>
         </td>
         <td>
        <a href="brands.php?delete=<?php echo $rows['Bra_ID'] ?>" class="btn 
            btn-danger confirm">
            <i class="far fa-trash-alt"></i>
        </a>
       </td>
       </tr>

       <?php } ?>
     </tbody>
  </table>
</div>


I want the statment That's used to Update to Work, it's like it dosen't existe Please Help

Answer 1

数据库是可交易的，这意味着在每条语句（如电子邮件）之后，您必须先发送，然后（如果您希望得到这样的答复）。< / p>

        if (isset($_GET['edit'])) { //This not working work
          $sql = "UPDATE brand SET brand = '$brand' WHERE 
                  Bra_ID='$editid'";

          //UPDATE query transaction
          $stmt = $con->prepare($sql);
          $stmt->execute();
        }

        $sql = "INSERT INTO brand(brand) VALUES('$brand')";

        $stmt = $con->prepare($sql);
        $stmt->execute();

由于未执行命令，因此变量$ sql被覆盖

         if (isset($_GET['edit'])) { //This not working work
         $sql = "UPDATE brand SET brand = '''$brand' WHERE 
                 Bra_ID='$editid'";
         }
         $sql = "INSERT INTO brand(brand) VALUES('$brand')";
         echo($sql);
         $stmt = $con->prepare($sql);
         $stmt->execute();

在上面的语句中，$ sql将回显INSERT命令，因为它覆盖了先前的语句，然后执行了。

isset（$ _ GET ['edit']）之后的代码不起作用

1 个答案: