Question

如何使用PHP验证MySQL中的DELETE语句是否成功？查看带注释的区域。

if ($stmt = $db->prepare($query)) 
{
    $stmt->bind_param('i', $useid);
    $stmt->execute();
    $result = $stmt->get_result();

    // did DELETE call succeed and not error out?

    $stmt->close();
}

Answer 1

结果必须返回true，然后使用$stmt->affected_rows

if ($stmt = $db->prepare($query)) 
    {
        $stmt->bind_param('i', $useid);
        $result_del=$stmt->execute();
        if($result_del){
           printf("rows deleted: %d\n", $stmt->affected_rows);
        }

        // did DELETE call succeed and not error out?

        $stmt->close();
    }

Answer 2

if ($stmt = $db->prepare($query)) 
{
    $stmt->bind_param('i', $useid);
    $result = $stmt->execute();

    if ($result) {
      echo "call succeeded"; # means no syntax error
    }

    if ($stmt->affected_rows > 0) {
      echo "at least one row was deleted";
    }

    $stmt->close();
}

Answer 3

您可以检查execute（）函数的返回值

if ($stmt = $db->prepare($query)) 
{
    $stmt->bind_param('i', $useid);
    if($stmt->execute()) {
        //Action to perform if successful
    }
    else {
       //Action to perform on failure
    }

    $stmt->close();
}

Answer 4

像这样：

if ($stmt = $db->prepare($query)) 
{
    $stmt->bind_param('i', $useid);
    $stmt->execute();
    $result = $stmt->get_result();

    $deleted = $stmt->affected_rows;
    print("Deleted $deleted rows.\n");

    $stmt->close();
}

affected_rows()可让您知道最近一次查询会影响多少行。

如何使用PHP验证MySQL中的DELETE语句是否成功？

4 个答案: