如何使用PHP在MySQL中进行多查询循环

Question

我需要找到一个多查询解决方案。

这是我的代码：

<?php
$link = mysqli_connect("localhost", "root", "nlpgroup", "testdb");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
//$query .= "";
$query  = "insert into EM8 
SELECT sourceindex,targetindex,source,target,new_count, new_count / sum_new_count as prob
FROM EM7, (
    SELECT SUM(new_count) sum_new_count
    FROM EM7
) sq;";
$query .= "insert into EM9
select sourceindex,source,sum(prob) as lundax from EM8 group by sourceindex;";
$query .= "insert into EM10 select `sourceindex`, `source`, `lundax` , pa/lundax alva  
from
EM9 
cross join (select exp(sum(ln(lundax))) pa
from EM9 ) t;";
$query .= "insert into EM11 select
        t1.sourceindex
      , t1.targetindex
      , t1.source
      , t1.target          
      , t1.prob as EM8_prob
      , t1.prob*t2.alva  as pa_alva
from EM8 t1
inner join EM10 t2 on t1.sourceindex = t2.sourceindex
;";
$query .= "insert into EM12
select x.sourceindex
      ,x.targetindex
      ,x.source
      ,x.target
      ,c as new_count
from EM11 x
join (SELECT GREATEST(source,target) g,LEAST(source,target) l,sum(pa_alva) c FROM EM11 GROUP BY g,l ) y
ON (y.g = x.source AND y.l = x.target) 
  OR (y.g = x.target AND y.l = x.source);";
//===========
/* execute multi query */
if (mysqli_multi_query($link, $query)) {
    do {
        /* store first result set */
        if ($result = mysqli_store_result($link)) {
            while ($row = mysqli_fetch_row($result)) {
                printf("%s|%s|%s|%s|%s\n", $row[0],$row[1],$row[2],$row[3],$row[4]);
            }
            mysqli_free_result($result);
        }
        /* print divider */
        if (mysqli_more_results($link)) {
            printf("-----------------\n");
        }
    } while (mysqli_next_result($link));
}

/* close connection */
mysqli_close($link);
?>

---

从表EM8-> EM12开始，我想做下一步。

---

INSERT INTO EM8 
SELECT sourceindex,targetindex,source,target,new_count, new_count / sum_new_count as prob
FROM EM12, (
    SELECT SUM(new_count) sum_new_count
    FROM EM12
) sq

---

之后截断EM9-> EM12

然后从EM8-> EM12继续

我该如何循环？

Answer 1

我不确定您要如何构建查询，但我会尽力提供一个过程。 （*顺便说一句，对我来说，您的所有查询看起来都像是INSERTS，因此不会有任何结果集用于printf。）

使用php遍历表名以构建所有查询。

for($x=8; $x<13; ++$x){
    $y=$x-1;
    //dynamic query build:
    $queries[]="INSERT INTO `EM$x`
                       SELECT sourceindex,targetindex,source,target,new_count,new_count/sum_new_count AS prob 
                       FROM `EM$y`,
                       (SELECT SUM(new_count) sum_new_count FROM `EM$y`) sq";
     // ... add all of your queries using $x and $y into the $queries array.
     // ... add truncating query.
 }

然后，在建立所有查询之后，可以运行mysqli_multi_query（）

if(mysqli_multi_query($link,implode(';',$queries))){
    do{
        list($current_key,$current_query)=each($queries);   //advances array pointer to first or next element
        if(mysqli_affected_rows($link)<1){
            $message="Logic Error @ Query:<br>$current_query";
            break; // I assume you want to break when insert or delete fails
        }
    } while(mysqli_more_results($link) && mysqli_next_result($link));
}else{
    list($current_key,$current_query)=each($queries);   //advances array pointer to first element
}
if($error_mess=mysqli_error($link)){
    $message="Syntax Error @ Query:<br>$current_query<br>Error Message:<br>$error_mess";
}
if(!$message){
    echo "All queries successful!";
}else{
    echo "$message";
}

我很可能误解了您的部分/全部问题。 希望这会有所帮助。 让我知道是否需要更多帮助。