php mysqli子查询在读取const表后返回impossible where

bjp0bcyl  于 2021-06-17  发布在  Mysql
关注(0)|答案(1)|浏览(219)

所以,我知道这是一个非常普遍的错误,但我没有更好的线索来解释我的查询发生了什么,我也不能解释它比这更好,感谢mysql没有给用户体验一个****的,所以请容忍我。
我使用的是PHP7.2.1和MySQL5.7。
我有个问题:

SELECT
    sp.*
FROM
    `status` s
    LEFT JOIN status_pedido sp ON sp.status_pedido_id = s.status_pedido_id 
WHERE
    s.status_id = (
SELECT
    `status`.status_id 
FROM
    pedido_item_status p1
    LEFT JOIN `status` ON `status`.status_id = p1.status_id
    LEFT JOIN pedido_item ON pedido_item.pedido_item_id = p1.pedido_item_id
    INNER JOIN ( SELECT MAX( pi.cadastrado ) AS maxcadastro FROM pedido_item_status pi GROUP BY pi.pedido_item_id ) p2 ON ( p1.cadastrado = p2.maxcadastro ) 
    AND p1.excluido IS NULL 
WHERE
    p1.pedido_id = 15720 
ORDER BY
    `status`.sta_ordem ASC 
    LIMIT 1 
    )

它在navicat或heidi上运行良好,只返回1个结果。但当我在php上执行mysqli->query时,返回空行:

object(mysqli_result)#135 (5) { ["current_field"]=> int(0) ["field_count"]=> int(11) ["lengths"]=> NULL ["num_rows"]=> int(0) ["type"]=> int(0) }

navicat返回以下内容:

+----+-------------+-------------+--------+-------------------+-------------+---------+---------------------------+-------+---------------------------------------------------------------------+--+
| id | select_type |    table    |  type  |   possible_keys   |     key     | key_len |            ref            | rows  |                                Extra                                |  |
+----+-------------+-------------+--------+-------------------+-------------+---------+---------------------------+-------+---------------------------------------------------------------------+--+
|  1 | PRIMARY     | s           | const  | PRIMARY           | PRIMARY     |       4 | const                     |     1 |                                                                     |  |
|  1 | PRIMARY     | sp          | const  | PRIMARY           | PRIMARY     |       4 | const                     |     1 |                                                                     |  |
|  2 | SUBQUERY    | p1          | ref    | idx_1,idx_2,idx_3 | idx_1       |      10 | const,const               |     5 | Using index condition; Using where; Using temporary; Using filesort |  |
|  2 | SUBQUERY    | status      | eq_ref | PRIMARY           | PRIMARY     |       4 | emgraf2.p1.status_id      |     1 |                                                                     |  |
|  2 | SUBQUERY    | pedido_item | eq_ref | PRIMARY           | PRIMARY     |       4 | emgraf2.p1.pedido_item_id |     1 | Using index                                                         |  |
|  2 | SUBQUERY    | <derived3>  | ref    | <auto_key0>       | <auto_key0> |       5 | emgraf2.p1.cadastrado     |    10 | Using index                                                         |  |
|  3 | DERIVED     | pi          | ALL    | idx_2,idx_3       |             |         |                           | 18750 | Using temporary; Using filesort                                     |  |
+----+-------------+-------------+--------+-------------------+-------------+---------+---------------------------+-------+---------------------------------------------------------------------+--+

在php上返回:

array(10) {
["id"]=>
string(1) "1"
["select_type"]=>
string(7) "PRIMARY"
["table"]=>
NULL
["type"]=>
NULL
["possible_keys"]=>
NULL
["key"]=>
NULL
["key_len"]=>
NULL
["ref"]=>
NULL
["rows"]=>
NULL
["Extra"]=>
string(51) "Impossible WHERE noticed after reading const tables"
}
array(10) {
["id"]=>
string(1) "2"
["select_type"]=>
string(8) "SUBQUERY"
["table"]=>
string(2) "p1"
["type"]=>
string(3) "ref"
["possible_keys"]=>
string(17) "idx_1,idx_2,idx_3"
["key"]=>
string(5) "idx_1"
["key_len"]=>
string(2) "10"
["ref"]=>
string(11) "const,const"
["rows"]=>
string(1) "5"
["Extra"]=>
string(67) "Using index condition; Using where; Using temporary; Using filesort"
}
array(10) {
["id"]=>
string(1) "2"
["select_type"]=>
string(8) "SUBQUERY"
["table"]=>
string(6) "status"
["type"]=>
string(6) "eq_ref"
["possible_keys"]=>
string(7) "PRIMARY"
["key"]=>
string(7) "PRIMARY"
["key_len"]=>
string(1) "4"
["ref"]=>
string(20) "emgraf2.p1.status_id"
["rows"]=>
string(1) "1"
["Extra"]=>
NULL
}
array(10) {
["id"]=>
string(1) "2"
["select_type"]=>
string(8) "SUBQUERY"
["table"]=>
string(11) "pedido_item"
["type"]=>
string(6) "eq_ref"
["possible_keys"]=>
string(7) "PRIMARY"
["key"]=>
string(7) "PRIMARY"
["key_len"]=>
string(1) "4"
["ref"]=>
string(25) "emgraf2.p1.pedido_item_id"
["rows"]=>
string(1) "1"
["Extra"]=>
string(11) "Using index"
}
array(10) {
["id"]=>
string(1) "2"
["select_type"]=>
string(8) "SUBQUERY"
["table"]=>
string(10) "<derived3>"
["type"]=>
string(3) "ref"
["possible_keys"]=>
string(11) "<auto_key0>"
["key"]=>
string(11) "<auto_key0>"
["key_len"]=>
string(1) "5"
["ref"]=>
string(21) "emgraf2.p1.cadastrado"
["rows"]=>
string(2) "10"
["Extra"]=>
NULL
}
array(10) {
["id"]=>
string(1) "3"
["select_type"]=>
string(7) "DERIVED"
["table"]=>
string(2) "pi"
["type"]=>
string(3) "ALL"
["possible_keys"]=>
string(11) "idx_2,idx_3"
["key"]=>
NULL
["key_len"]=>
NULL
["ref"]=>
NULL
["rows"]=>
string(5) "18750"
["Extra"]=>
string(31) "Using temporary; Using filesort"
}

据我从类似问题中了解到的,这与客户端保持连接并在分析整个查询后执行查询有关,而当一个内部where似乎返回0行时,php就停止了。但我不知道如何在我的查询中解决这个问题,因为我没有在sql上设置任何变量,只是进行子查询。
还有一个问题:完全相同的查询在另一个代码块上运行,我不明白为什么会这样。下面是有问题的代码:

$sql_sta = "SELECT pis.pedido_item_status_id, pi.pedido_item_id, pi.status_id, p.pedido_id, psp.pedido_status_pedido_id, sp.stp_ordem
            FROM pedido_item_status pis                
            LEFT JOIN pedido_item pi ON pis.pedido_item_id = pi.pedido_item_id
            LEFT JOIN pedido p ON pi.pedido_id = p.pedido_id
            LEFT JOIN status_pedido sp ON sp.status_pedido_id = p.status_pedido_id 
            LEFT JOIN pedido_status_pedido psp ON (psp.status_pedido_id = sp.status_pedido_id AND psp.pedido_id = p.pedido_id)
            WHERE pis.pedido_item_status_id = {$_GET['del']}
            LIMIT 1";

$res_sta = ClassDb::query($sql_sta);
$status_del = $res_sta->fetch_assoc();

$sql_ped = "SELECT sp.* FROM `status` s
            LEFT JOIN status_pedido sp ON sp.status_pedido_id = s.status_pedido_id
            WHERE s.status_id = (
                SELECT `status`.status_id FROM pedido_item_status p1
                LEFT JOIN `status` ON `status`.status_id = p1.status_id
                LEFT JOIN pedido_item ON pedido_item.pedido_item_id = p1.pedido_item_id
                INNER JOIN ( SELECT pi.pedido_id, MAX( pi.cadastrado ) AS maxcadastro FROM pedido_item_status pi GROUP BY pi.pedido_item_id ) p2
                ON ( p1.cadastrado = p2.maxcadastro ) AND p1.excluido IS NULL 
                WHERE p1.pedido_id = 15720
                ORDER BY `status`.sta_ordem ASC 
                LIMIT 1
            )";
$res_ped = ClassDb::query($sql_ped);

以下是工作代码:

$sql_sta = "SELECT sp.* FROM pedido_item pi
            LEFT JOIN pedido p ON pi.pedido_id = p.pedido_id
            LEFT JOIN status_pedido sp ON sp.status_pedido_id = p.status_pedido_id 
            WHERE pi.pedido_item_id = {$_POST['pedido_item_id']}";
$res_sta = ClassDb::query($sql_sta);
$status_antigo = $res_sta->fetch_assoc();

$sql_ped = "SELECT sp.* FROM `status` s
            LEFT JOIN status_pedido sp ON sp.status_pedido_id = s.status_pedido_id
            WHERE s.status_id = (
                SELECT `status`.status_id FROM pedido_item_status p1
                LEFT JOIN `status` ON `status`.status_id = p1.status_id
                LEFT JOIN pedido_item ON pedido_item.pedido_item_id = p1.pedido_item_id
                INNER JOIN ( SELECT MAX( pi.cadastrado ) AS maxcadastro FROM pedido_item_status pi GROUP BY pi.pedido_item_id ) p2
                ON ( p1.cadastrado = p2.maxcadastro ) AND p1.excluido IS NULL 
                WHERE p1.pedido_id = {$_POST['pedido_id']}
                ORDER BY `status`.sta_ordem ASC 
                LIMIT 1
            )";
$res_ped = ClassDb::query($sql_ped);
$status_atual = $res_ped->fetch_assoc();

它们之间唯一的区别是我首先运行不同的查询来检索 pedido_id ,我尝试将变量更改为静态值并对第一个查询进行注解,输出仍然是相同的,而且,工作代码在表单简单post之后运行,在我插入一行之后运行,而有问题的运行来自ajax get请求,在我更新一行之后软删除它(设置列) excluido 到now(),将其视为 deleted_at 来自拉威尔)。尝试在navicat上手动运行querys,效果很好。
因为post已经太长了,而且表又大又复杂,只要假设结果在那里,所有的列都存在,查询在navicat上执行得很好,并返回一个结果,同时还返回一个使用相同查询的工作代码块上的结果。
edit1:没有php错误或异常,也没有mysqli错误,我已经将它们设置为显示。查询只返回空结果,代码正常流动。
编辑2:尝试直接在mysql shell上运行,结果与navicat或heidi相同:

+------------------+-----------+----------------+-----------+----------+------------+------------+---------+----------+-----------+-----------+
| status_pedido_id | stp_nome  | stp_observacao | stp_ordem | excluido | cadastrado | atualizado | stp_cor | stp_icon | stp_alert | status_id |
+------------------+-----------+----------------+-----------+----------+------------+------------+---------+----------+-----------+-----------+
|                7 | Cancelado | NULL           |         8 | NULL     | NULL       | NULL       | NULL    | NULL     | NULL      |         9 |
+------------------+-----------+----------------+-----------+----------+------------+------------+---------+----------+-----------+-----------+
1 row in set (0.0269 sec)
ego6inou

ego6inou1#

嗯,我刚刚发现了“错误”的原因。事实上,这根本不是一个错误,只是我在装傻。
在php代码中,我更新了一行 excluidoNOW() ,所以其中一个选定的行被软删除,这导致查询返回0行,但是由于autocommit被设置为false,并且在我转储查询时我没有提交查询,所以更新被回滚,并且我在navicat上运行查询时没有任何软删除的行,这就是为什么它可以工作的原因。现在,在调试之前提交查询,行被软删除,navicat/heidi还返回0行。
我还没有弄明白为什么它返回0行,但是我认为这个问题属于另一个问题,而不是这个问题,所以如果我不能自己解决这个问题,我将提出一个新问题。我只是回答我自己的问题来结束这条线,不要浪费你宝贵的时间。
感谢所有在评论中帮助我的人。

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