Question

嘿那里我正在尝试将我的php sql查询代码从mysqli更改为PDO，因为我可以自己注入它。 mysqli代码正在寻找l

$result = $mysqli->query($sql) or die($mysqli->error);
while ( $row = $result->fetch_assoc() ){
     $output[] = $row;
}
echo json_encode($output);`

像这样的PDO代码

$statement=$pdo->prepare($sql);
$statement->execute();
$result = $statement->fetchAll(PDO::FETCH_ASSOC);

echo json_encode($result);

这是查询：

Select s.*, t.team_name as team_1_name, t1.team_name as team_2_name from spiele s, 
   teams t, teams t1, gruppen g, kategorien k where s.team_1=t.team_id and
   t.gruppen_id=g.gruppen_id and g.kategorien_id=k.kategorien_id and k.kat_name='".$kat."'
   and s.team_2=t1.team_id
Union Select s.*, t.team_name as team_1_name, t1.team_name as team_2_name from
   gruppenfinalspiele s, gruppenfinalteams t1, gruppenfinalteams t, gruppen g, kategorien k
   where s.team_1=t.finalteam_id and t.gruppen_id=g.gruppen_id and
   g.kategorien_id=k.kategorien_id and k.kat_name='".$kat."' and s.team_2=t1.finalteam_id
Union Select s.*, t.team_name as team_1_name, t1.team_name as team_2_name from
   halbfinalspiele s, halbfinalteams t, halbfinalteams t1, kategorien k where
   s.team_1=t.finalteam_id and t.kategorien_id=k.kategorien_id and k.kat_name='".$kat."'
   and s.team_2=t1.finalteam_id
Union Select s.finalspiel_id, s.team_1, s.team_2, s.spielzeit, s.feld, s.tore_1, s.tore_2, 
   s.sieger, s.placeholder_team_1 as team_1_name, s.placeholder_team_2 as team_2_name from 
   finalspiele s, kategorien k where s.kategorien_id=k.kategorien_id and 
   k.kat_name='".$kat."'
ORDER BY spielzeit, Feld

这些是第一行结果：对于mysqli：

[{"spiel_id":"2","team_1":"1","team_2":"2","spielzeit":"18:00:00","feld":"A",
 "tore_1":"0","tore_2":"4","sieger":"2","team_1_name":"Los Ventilos Oberdorf", 
 "team_2_name":"Sambaschr\u00e4nzer Bubendorf 2"},

和PDO：

{"spiel_id":"2","team_1":"1","team_2":"2","spielzeit":"18:00:00","feld":"A",
 "tore_1":"0","tore_2":"4","sieger":"2","team_1_name":"Los Ventilos Oberdorf",
 "team_2_name":null}

现在的问题是最后一个Value（team_2_name）为null。有人可以告诉我为什么或我需要改变什么？

由于

从mysqli到PDO没有取得一切

0 个答案: