从PHP查询创建CSV文件,然后转换为GEOJSON文件

时间:2014-06-04 18:41:26

标签: php csv geojson

我有一个PHP方法,它返回一个json字符串,如下所示:

function getjson(){
$mun = $this->input->POST('municipality');
$sl  = $this->input->POST('saleslimit'); 
$q = $this->db->query("SELECT RollNum , Address, v2_lat, v2_lng  
    FROM tblontario WHERE Municipality = '".$mun."'"." LIMIT ".$sl);            
        $json_string = json_encode($q->result(), JSON_PRETTY_PRINT);
        file_put_contents('/home/apts/Dropbox/ptax.ca/js/salecomps.json', $json_string);
        echo $json_string;
}

我希望能够返回一个CSV文件,而不是返回一个json字符串,以便我可以将该CSV文件转换为geojson文件,该文件可以加载到{{ 3}}。

关于如何实现这一目标的任何想法?最终我的目标是创建一个geojson文件,但我不确定最好的方法。感谢。

2 个答案:

答案 0 :(得分:1)

据我所知,您基本上在寻找getCSV()函数。您可以通过手动连接结果集的元素来完成此操作。这样的事情。

function getCSV(){
    $mun = $this->input->POST('municipality');
    $sl  = $this->input->POST('saleslimit'); 
    $q = $this->db->query("SELECT RollNum , Address, v2_lat, v2_lng FROM tblontario WHERE Municipality = '".$mun."'"." LIMIT ".$sl);
    $row = $q->result();
    $csvString =  $row->{'RollNum'}.','.$row->{'Address'}.','.$row->{'v2 lat'}.','.$row->{'v2 lng'};
    file_put_contents('/home/apts/Dropbox/ptax.ca/js/salecomps.csv', $csvString);
    echo $csvString;
}

答案 1 :(得分:1)

如果$ row是一个数组,你可以这样做:

function getCSV() {
    $mun = $this->input->POST('municipality');
    $sl  = $this->input->POST('saleslimit'); 
    $q = $this->db->query("
        SELECT 
            RollNum, 
            Address,
            v2_lat,
            v2_lng 
        FROM
            tblontario 
        WHERE 
            Municipality = '".$mun."'"." 
        LIMIT ".$sl
    );
    $row = $q->result();
    $csvRow = implode(",",$row);
    file_put_contents('/home/apts/Dropbox/ptax.ca/js/salecomps.csv', $csvRow);
    echo $csvRow;
}

由于我看到了限制,我猜测你得到的不止一个结果和$ q-> result();返回一个结果数组而不是一行,在这种情况下..

function getCSV() {
    $mun = $this->input->POST('municipality');
    $sl  = $this->input->POST('saleslimit'); 
    $q = $this->db->query("
        SELECT 
            RollNum, 
            Address,
            v2_lat,
            v2_lng 
        FROM
            tblontario 
        WHERE 
            Municipality = '".$mun."'"." 
        LIMIT ".$sl
    );
    $res = $q->result();
    if(!empty($res)){
        $fh = fopen('/home/apts/Dropbox/ptax.ca/js/salecomps.csv','w');
        foreach($res as $row){
            // as suggested by @GigaWatt, swapped fwrite for fputcsv
            fputcsv($fh,$row);
        }
        fclose($fh);
        echo file_get_contents('/home/apts/Dropbox/ptax.ca/js/salecomps.csv');
    } else {
        echo "";
    }

}

编辑:看一下GeoJSON规范,你想要的是:

function getGeoJSON() {
    $mun = $this->input->POST('municipality');
    $sl  = $this->input->POST('saleslimit'); 
    $q = $this->db->query("
        SELECT 
            RollNum, 
            Address,
            v2_lat,
            v2_lng 
        FROM
            tblontario 
        WHERE 
            Municipality = '".$mun."'"." 
        LIMIT ".$sl
    );
    $res = $q->result();
    if(!empty($res)){
        $geoArr = Array(
            "type" => "MultiPoint",
            "coordinates" => Array()
        );
        foreach($res as $row) {
            $geoArr["coordinates"][] = Array($row['v2_lat'],$row['v2_lng']);
        }
        $geoJSON = json_encode($geoArr);
        file_put_contents('/home/apts/Dropbox/ptax.ca/js/salecomps.geojson',$geoJSON);
        echo $geoJSON;
    } else {
        echo "{}";
    }

}