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Home Backend Development PHP Tutorial 请教 mysql_unbuffered_query 遇到的问题

请教 mysql_unbuffered_query 遇到的问题

Jun 20, 2016 pm 12:44 PM

请问一下

$lh  = mysql_connect( 'localhost', 'root', 'root' ); 
$qry  = "SELECT * FROM aaa LIMIT 10"; 
$rh  = mysql_unbuffered_query($qry, $lh); 
$thread = mysql_thread_id ( $lh ); 
while ( $res = mysql_fetch_row( $rh ) ) 

    $sql = "INSERT INTO bbb(goods_id,user_id) values(1111,2222)";
    mysql_query($sql);
    //如果在循环里执行了其它SQL那么while就终止了。请问是什么情况?


回复讨论(解决方案)

掩耳盗铃??你屏蔽了错误信息:
Function called without first fetching all rows from a previous unbuffered query
函数调用没有首先取从先前的无缓冲的查询所有行

对手册中的描述,总不能视而不见吧?
在向 MySQL 发送一条新的 SQL 查询之前,必须提取掉所有未缓存的 SQL 查询所产生的结果行。 

@xuzuning 请问要怎么处理,不太明白提取掉所有未缓存的SQL查询所产生的结果行。

比如你有 $qry  = "SELECT * FROM aaa LIMIT 10"; 
也就是 $rh  = mysql_unbuffered_query($qry, $lh);  后
资源 $rh 中应有不多于 10 行的结果

你要把他们都读出来以后,才可执行其他的数据库操作
说白了就是:你不让 MySQL 缓存结果,你就得自己缓存结果

@xuzuning 白话一点说就是上面代码中 while 里面不能发送新的SQL,因为结果没有提取完?
是这样理解不

是的,就是这样!

非常感谢版主的细心讲解。

/如果在循环里执行了其它SQL那么while就终止了。请问是什么情况?
因为while ( $res = mysql_fetch_row( $rh ) ) 的mysql_fetch_row($rh) 被影响了

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