如何将正确的数据格式从SQL传递到PHP

Question

我需要使用highcharts创建basic column chart。这里是我的PHP代码：

$query = "SELECT campaign_id, kpi, label, val FROM table WHERE id = $1"; 

$result = pg_prepare($db, "report", $query); 
$result = pg_execute($db, "report", array($campaignID)); 

while ($row = pg_fetch_array($result, NULL, PGSQL_ASSOC)) 
{ 
    $response['xlabels'][] = $row['label']; 
    $response['xdata'][] = (float)$row['val']; 
} 

pg_free_result($result); 
pg_close($db); 

echo json_encode($response); 

PostgreSQL的查询返回的数据如下（CAMPAIGN_ID = 5，例如）：

id | kpi | label | val 
----+-----------+-------+------ 
    5 | Voter  | East | 0.18 
    5 | Non-Voter | East | 0.12 
    5 | Voter  | West | 0.82 
    5 | Non-Voter | West | 0.88 

我的API保存xlabels和xdata到xAxis.categories和series：

$.get('vote_api.php', {'id' : id}, function(data) { 

    options.chart.type = 'column'; 

    options.xAxis.categories = data.xlabels; 
    options.series = data.xdata; 

    chart = new Highcharts.Chart(options); 

    }, "json"); 

kpi（选民与非选民）的正确数据格式为我的系列和label（东VS西）作为我的X轴应（请参考JSFiddle）：

xAxis.categories = ['East', 'West']; 
series = [{name: 'Voter', 
      data: [0.18, 0.82]}, 
      {name: 'Non-Voter', 
      data: [0.12, 0.88]}] 

但是我while loop部分$response['xlabels'][] = $row['label']; $response['xdata'][] = (float)$row['val'];给我这样的事情：

[xlabels] => Array 
    (
     [0] => East 
     [1] => East 
     [2] => West 
     [3] => West 
    ) 

[xdata] => Array 
    (
     [0] => 0.18 
     [1] => 0.12 
     [2] => 0.82 
     [3] => 0.88 
    ) 

会有人给出一些提示如何去做这个？我真的很感激它！

Answer 1

你可以试试：

$query = "SELECT campaign_id, kpi, label, val FROM table WHERE id = $1"; 

$result = pg_prepare($db, "report", $query); 
$result = pg_execute($db, "report", array($campaignID)); 

while ($row = pg_fetch_array($result, NULL, PGSQL_ASSOC)) 
{ 
    if (!in_array($row['label'], $response['xlabels'])) 
    { 
     $response['xlabels'][] = $row['label']; 
    } 
    $response['xdata'][ $row['kpi'] ][] = (float)$row['val']; 
} 

pg_free_result($result); 
pg_close($db); 

第一个变化：

if (!in_array($row['label'], $response['xlabels'])) 
    { 
     $response['xlabels'][] = $row['label']; 
    } 

避免了多次拯救 “东方” 和 “西方” 你xlabels阵列。

第二个变化：

$response['xdata'][ $row['kpi'] ][] = (float)$row['val']; 

将添加一个维度到XDATA数组：值根据它们的“KPI”分配给不同的阵列。