Question

我在install.packages("rJava"); library(rJava)列（1,47,6）中有价值。如何获得所有价值？

我使用了以下代码。

user_id

此$array_data = array($project_id); $query = "SELECT * FROM p INNER JOIN pl ON p.pl_id = pl.pl_id INNER JOIN user ON p.user_id = user.user_id WHERE p.p_id=?"; $stmt = $conn->prepare($query); $stmt->execute($array_data); $result_data = $stmt->fetchAll( PDO::FETCH_ASSOC ); $ids = array(); foreach($result_data as $rows) { $ids[] = $rows['user_id']; } $id = implode(',',$ids); echo $id;仅返回第一个值（1）。我需要所有3个值。请帮助＆amp;提前谢谢。

Answer 1

在循环之前声明$ids数组并回显数组

之后的内爆内容

$array_data = array($project_id);               
$query = "select `user_id` from p
          inner join pl on p.pl_id = pl.pl_id
          inner join user on p.user_id = user.user_id where 
          p.p_id=?";


$stmt = $conn->prepare($query);
$stmt->execute($array_data);
$result_data = $stmt->fetchAll( PDO::FETCH_ASSOC );

$ids = array();  /* declare variable before loop */

foreach($result_data as $rows) {

    $ids[] = $rows['user_id'];                      

}

$id = implode(',',$ids); /* output after loop */

从MySQL PDO中获取单列的所有值

1 个答案: