MySQL PHP 如何分批量的从数据库循环读取数据？

Question

假如每次从数据库读取五条，该怎么一直让程序循环下去，直到全都循环完成。加个 $a = true; //然后用while循环 //在数据库里设计个字段，为判断有没有取出来过这条数据的字段，默认为没取出来过 //然后用foreach把每次取出来的每条数据都标记为已取出过，直到所有数据都被标记为已取出过来，循环停止。 这样的逻辑对吗？

Answer 1

<?php

$read  =  ture;
$limit =  0;
while($read)
{    

    $sql = "select id,name from table limit {$limit},5";
    $data = $db->select($sql); 
    //todo 你的业务逻辑
    
    if(!data)
    {    
        $read = false;
        break;数据为空,直接停止了循环
    }
   
    $limit += 5;每次获取后面5条,直至数据查询为空.

}

Answer 2

你用limit呀。然后记录id，直到id大于maxid不就可以了么???

Answer 3

可以用分页查询的原理啊。。

$count = '100';//总条数
$strip = 0;
$num = $count/5;//循环多少次
for($i=1;$i<=$num;$i++)
{
 $sql = "select * from `table` order by id limit ".$strip.",5";
 $strip += 5;
}

Answer 4

$id = 0;
while(true){
   $arr = $db->query('select id,name from users where id>'.$id.' limit 5');
   if(count($arr) == 0) {
     break;
   }
   // 处理逻辑 
   
  if(count($arr) < 5) {
     break;
   }
   $id = $arr[4]['id']; // 取最后一个id
}

Answer 5

最好for循环里面sleep下，让cpu休息一下

Answer 6

I will suggest you using a Loop when enters the name. Make sure to use ForEach Loop. Moreover let me tell you that you can Check Chase Verify.

Answer 7

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Answer 8

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PHP and SQL work in parallel in WordPress, helping you create dynamic content based on a variety of factors, such as your IDs and user roles. This allows you to do many things like hiding or show content to specific users, like admins, editors or subscribers. These tasks can not be completed if SQL and MySQL.
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Answer 9

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Answer 10

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