Question

我试图执行两个select语句，但它只显示第一个。我尝试使用foo->nextRowset();但它不起作用，他停止向我显示第一个查询。我怎样才能获得2个查询的内容？我这样做是因为我需要在前端合并这些内容。

PHP：

<?php
header('Content-Type: application/json');

$dificuldade = $_GET ['dificuldade'];//Define a dificuldade das perguntas que seram selecionadas

$numquestions = $_GET ['rodada'];//Número de perguntas que serão retornadas


switch ($numquestions) {
    case '1':
    $numquestions = "10";
    break;
    case '2':
    $numquestions = "15";
    break;
    case '3':
    $numquestions = "20";
    break;
}
try{
    $conexao = new PDO ("mysql:host=localhost; dbname=teocratico; charset=utf8","root","");
} catch (PDOException $erro){
    echo $erro->getmessage();
}

$stmt = $conexao->query ("SELECT
    perguntas.id_pergunta,
    perguntas.pergunta,
    perguntas.resposta,
    dificuldade.dificuldade
    FROM perguntas
    JOIN dificuldade
    ON dificuldade.id_dificuldade = perguntas.dificuldade
    WHERE dificuldade.id_dificuldade = $dificuldade limit $numquestions;


    SELECT descricao from desafios ORDER BY RAND();

    ");

$data = $stmt->fetchAll(PDO::FETCH_ASSOC);

$json = json_encode($data, JSON_PRETTY_PRINT);

echo $json;


?>

Answer 1

您需要单独执行每个语句：

select d.DirectoryName, d.DirectoryCount , f.Filename,f.FileNameCount from
(
select DirectoryName,
count(*)as DirectoryCount
 from tblTable
group by DirectoryName
) as d
inner join
(
select DirectoryName, FileName,
count(*)as filenameCount
 from tblTable
group by DirectoryName,FileName
) as f
on d.directoryName=f.DirectoryName
order by DirectoryName, FileName

如何获取第二个查询的结果

1 个答案: