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MySQL Update problem
原标题:MySQL Update problem
  • 时间:2010-02-18 23:26:47
  •  标签:
  • php
  • mysql
$result=mysql_query(" UPDATE xxxxxx_users SET User_Password= $Password  WHERE FstName= $First  AND LstName= $Last ",$db)  or die ("Password update successful!");
echo "Update failed, unknown user";

当名字和姓氏匹配时,这将正确更新数据库,当它们不匹配时,数据库不受影响。 我唯一的问题是,我总是显示“更新失败,未知用户”消息。 我做错了什么? 谢谢。

问题回答

当 SQL 查询成功时,mysql_query 函数返回true:

For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc, mysql_query() returns TRUE on success or FALSE on error.

你们的法典假设是,这些争.使行数回升。 Use the mysql_ Affect_rows 为此的职能:

$result=mysql_query(" UPDATE xxxxxx_users SET User_Password= $Password  WHERE FstName= $First  AND LstName= $Last ",$db)
if (mysql_affected_rows() > 0)
  die ("Password update successful!");
else
  echo "Update failed, unknown user";

或许需要以另一种方式这样做......

$result=mysql_query(" UPDATE xxxxxx_users SET User_Password= $Password  WHERE FstName= $First  AND LstName= $Last ",$db)
     or die ("Update failed, unknown user"); 

echo "Password update successful!";

如果第一部分(mysql_query)被证明为真,则无需评估第二部分或部分(die)。您可以改用“and”。

并且,请读到有关卡片注射。

推荐你的编码风格:

这样的东西

if ($result)
   ...success
else 
   ...fail

更易读。





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