如何使用php将mysql中的多行编码为json

时间:2013-09-14 01:28:49

标签: java php android mysql json

我正在尝试将从数据库中获取的所有数据行编码为JSON,然后在客户端处理它,但我似乎无法使其工作。我的代码在下面

function getTopic($conn){
    $response = array("error" => 0);
    $qry = "SELECT original_title, content, time FROM topic WHERE vis = 1";
    $result = $conn->prepare($qry);
    $result->execute();
    if($result->rowCount() > 0){
        $output = $result->fetchall();
        $response['text'] = $output['original_title'];
        $response['test'] = $output['content'];
        return json_encode($response);
        //return $output;
    }

然后我尝试打印var_dump($ response),但我得到空值。虽然如果我var_dump($ output)我得到一个数组中的所有行..访问数组是这里的问题现在..i想想

注意:我正在使用PDO

2 个答案:

答案 0 :(得分:1)

$ output是结果数组。使用循环或如果只有一行你需要这样做:

function getTopic($conn){
$response = array("error" => 0);
$qry = "SELECT original_title, content, time FROM topic WHERE vis = 1";
$result = $conn->prepare($qry);
$result->execute();
if($result->rowCount() > 0){
    $output = $result->fetchall();
    $response['text'] = $output[0]['original_title'];
    $response['test'] = $output[0]['content'];
    return json_encode($response);
    //return $output;
}

答案 1 :(得分:1)

问题是$ output是一个你需要经历的数组。像:

function getTopic($conn){
    $response = array("error" => 0);
    $qry = "SELECT original_title, content, time FROM topic WHERE vis = 1";
    $result = $conn->prepare($qry);
    $result->execute();
    if($result->rowCount() > 0){
        $output = $result->fetchall();
        foreach ($output as $o){
           $response['text'] = $o['original_title'];
           $response['test'] = $o['content'];
        }
        return json_encode($response);
    }
}

这是最后一个回复,但是如果你想要全部,请执行:

function getTopic($conn){
    $response = array('error'=>0);
    $qry = "SELECT original_title, content, time FROM topic WHERE vis = 1";
    $result = $conn->prepare($qry);
    $result->execute();
    if($result->rowCount() > 0){
        $output = $result->fetchall();
        foreach ($output as $o){
           $response[] = array('text'=>$o['original_title'],'test'=>$o['content']);
        }
        return json_encode($response);
    }
}

如果您只想要一行为MySQL语句添加限制。