求php多数组组合写入数据库方法

本帖最后由 wjm_hi 于 2013-10-25 15:55:24 编辑 我做一个成绩管理系统

//学科
$xk = array();

//年级
$nj = array();

//班级
$bj = array();

有三个数组，根据学科*年级*班级这个公式来生成多少条数据，然后写入到数据库。
例如：
count($xk)为2的时候，说明选择了2个学科
count($nj)为3的时候，说明选择了3个年级
count($bj)为7的时候，说明选择了7个年级
这时应该往数据库中插入2*3*7条数据，请问这个该怎么实现呢

回复讨论(解决方案)

php多循环，然后将数据下标循环最后写入数据库，PHP基础差，请求大侠们帮忙

$xk=Array ("1","2");
$nj=Array ("1","2","3");
$bj=Array ("1","2","3","4","5","6","7");
$xk=count($xk);
$nj=count($nj);
$bj=count($bj);
$test="$xk*$nj*$bj";
echo $test;
exit;
?>

晕，理解错了。、

该怎么理解呢

$xk=Array ("1","2");
$nj=Array ("1","2","3");
$bj=Array ("1","2","3","4","5","6","7");
$xk=count($xk);
$nj=count($nj);
$bj=count($bj);
$test="$xk*$nj*$bj";
echo $test;
exit;
?>

我是要生成INSERT INTO语句该怎么写呢

INSERT INTO `examinfo` (`nj`,`bj`,`xk`) VALUES ($nj ,$bj ,$xk)，VALUES 后面要插入$xk*$nj*$bj这么多条，该怎么弄呢

到精华区找计算笛卡尔积的代码

写个笨方法。
$xk=Array ("1","2");
$nj=Array ("1","2","3");
$bj=Array ("1","2","3","4","5","6","7");
$arr = array();
for($i=0;$i for($j=0;$j for($k=0;$k $arr[] = array($xk[$i],$nj[$j],$bj[$k]);
}
}
}
foreach($arr as $row){
//插入数据
}

这个有这么复杂嘛，用FOR可以做吗

for($i=0;$i

$xk=Array ("1","2");$nj=Array ("1","2","3");$bj=Array ("1","2","3","4","5","6","7");$arr = array();for($i=0;$i

写个笨方法。
$xk=Array ("1","2");
$nj=Array ("1","2","3");
$bj=Array ("1","2","3","4","5","6","7");
$arr = array();
for($i=0;$i for($j=0;$j for($k=0;$k $arr[] = array($xk[$i],$nj[$j],$bj[$k]);
}
}
}
foreach($arr as $row){
//插入数据
}

这个好像可行，foreach里面插入数据该怎么写SQL语句呢

$xk=Array ("1","2");$nj=Array ("1","2","3");$bj=Array ("1","2","3","4","5","6","7");$arr = array();for($i=0;$i


 能不能把   //插入数据  echo一下调用方法。  
  
$xk=Array ("1","2");$nj=Array ("1","2","3");$bj=Array ("1","2","3","4","5","6","7");$arr = array();for($i=0;$i

 我要的就是这个效果，我要将INSERT INTO `examinfo` (`nj`,`bj`,`xk`) VALUES ($nj ,$bj ,$xk)放到//插入数据的位置，我该怎么写呢。  
  
$xk=Array ("1","2");$nj=Array ("1","2","3");$bj=Array ("1","2","3","4","5","6","7");$arr = array();for($i=0;$i
  
$xk=Array ("1","2");$nj=Array ("1","2","3");$bj=Array ("1","2","3","4","5","6","7");$arr = array();for($i=0;$i


 非常感谢，但这SQL语句能做点优化最好了，INSERT INTO `examinfo` (`nj`,`bj`,`xk`) VALUES ($nj ,$bj ,$xk)一直是这句在循环，如果做成INSERT INTO `examinfo` (`nj`,`bj`,`xk`) VALUES (1 ,1 ,1),(1 ,1 ,2),(1 ,1 ,3)这样的SQL语句的话就完美了。  
  晕咯。哥们，你想实现怎么不自己想想呢。不能指望别人什么都给你做好，别人只能给你思路啊。。 
 
  晕咯。哥们，你想实现怎么不自己想想呢。不能指望别人什么都给你做好，别人只能给你思路啊。。  


 嗯，有这个思路，我可以继续往下做了，谢谢，优化的事我有思路了，谢谢了