Question

我想提醒用户是否成功查询或更新数据库..

adduser.php

<?php
include('sqlconnection.php');

$firstname = $_POST['fname'];
$lastname = $_POST['lname'];
$middlename = $_POST['mname'];
$password = $_POST['pword'];
$username = $_POST['uname'];
$gender = $_POST['gender'];
$utype = $_POST['utype'];

$query = "INSERT INTO user (firstname,lastname,middlename,gender) VALUES ('$firstname','$lastname','$middlename','$gender')";   

mysql_query($query);

$result = mysql_query("SELECT id FROM user WHERE firstname = '$firstname'");

$row = mysql_fetch_assoc($result);

mysql_query("INSERT INTO accounts (u_id,username,password,utype) VALUES ('$row["id"]','$username',md5('$password'),$utype);")
?>

我如何提醒用户？或者我应该使用什么来向用户提供一条弹出消息说明其成功？

Answer 1

检查受影响的行数，参考http://php.net/manual/en/function.mysql-affected-rows.php。

也弃用mysql_*个函数，尝试使用mysqli_*或PDO。

Answer 2

将变量分配给mysql_query，例如：

 $result = mysql_query("your query");

 if($result){
 $xxx = "query successful";
 }else{
 $xxx = "query failed";
 }

在hmtl：

中

 <script>
 alert(<?php echo $xxx;?>);
 </script>

这是一种方式，从这里你可以玩你想做的任何事情

另请注意：自PHP 5.5.0起，不推荐使用Mysql_ *扩展，将来也会删除。相反，应该使用MySQLi或PDO_MySQL扩展。

有用的链接Why shouldn't I use mysql_* functions in PHP

Answer 3

对于无效查询，

mysql_query()返回false。 mysql_num_rows()返回为select等查询返回的记录数。 mysql_affected_rows()检查受影响的行。

<强> EG：

$result = mysql_query("your query");

if($result){ 
  //query successful but this doesn't mean it returned anything
  //you can now use mysql_num_rows (for select query) to check if something is returned
  if( mysql_num_rows($result) > 0 ){
   //some results were returned
  }

  //for insert, update or delete query you need to check affected rows like this
  if( mysql_affected_rows() > 0 ){
   //some records were updated or deleted
  }
}else {
  echo "There was a problem";
}

Sidenote：从PHP 5.5.0开始，不推荐使用MySQL_*扩展名，将来会被删除。请改用MySQLi或PDO。

如果查询在php中成功，如何提醒用户？

3 个答案: