所以,我使用PHP脚本将MySQL输出到JSON,但我无法弄清楚如何输出正确的JSON格式。
这是PHP脚本:
$sql_query = "SELECT * FROM DiseaseData";
$res_sql = mysql_query($sql_query) or die(mysql_error());
$arr = array();
if(mysql_num_rows($res_sql) > 0){
ini_set('memory_limit', '-1');
while($row_sql = mysql_fetch_assoc($res_sql)){
$arr[] = $row_sql;
}
$json = json_encode($arr);
$file = '../../files/json/DiseaseData.json';
file_put_contents($file, $json);
}
ini_set('memory_limit', '-1');
以下是输出的JSON格式:
[{
"ID": "1",
"Magnitude": "0.842",
"County": "Alameda",
"Disease": "E. coli O157",
"lat": "37.7652",
"lng": "-122.242"
}, {
"ID": "2",
"Magnitude": "1.520",
"County": "Alameda",
"Disease": "HIV",
"lat": "37.7652",
"lng": "-122.242"
}]
这是我想要的JSON格式:
{
"columns":[{
"fieldName" : "ID",
"position" : 1
},
{
"fieldName" : "Magnitude",
"position" : 2
},
{
"fieldName" : "County",
"position" : 3
},
{
"fieldName" : "Disease",
"position" : 4
},
{
"fieldName" : "lat",
"position" : 5
},
{
"fieldName" : "lng",
"position" : 6
},]
"data": [
[ 1, 0.842, "Alameda", "E. coli O157", 37.7652, -122.242],
[ 2, 1.520, "Alameda", "HIV", 37.7652, -122.242]
]
}
答案 0 :(得分:1)
解决方案是这样的:
$columns
和$data
$columns
数组中,存储位置和关联的字段名称$data
数组中,使用while
循环插入所有数据行。$result
数组中插入两个数组,然后在其上应用json_enocde()
。以下是代码:
// your code
if(mysql_num_rows($res_sql) > 0){
$columns = $data = array();
$max_columns = mysql_num_fields($res_sql);
for($i=0; $i < $max_columns; $i++){
$columns[] = array('fieldName' => mysql_field_name($res_sql, $i), 'position' => $i+1);
}
while($row_sql = mysql_fetch_assoc($res_sql)){
$data[] = array_values($row_sql);
}
$result = array('columns' => $columns, 'data' => $data);
$json = json_encode($result);
// your code
}
注意:不要使用mysql_*
函数,从PHP 5.5开始不推荐使用它们,并且在PHP 7.0中完全删除它们。请改用mysqli
或pdo
。 And this is why you shouldn't use mysql_*
functions