将JSON文件的嵌套子级导入Postgresql

将JSON文件的嵌套子级导入Postgresql,json,postgresql,psql,jq,Json,Postgresql,Psql,Jq,我试图从JSON文件中导入一些数据。JSON文件是嵌套的,我想导入子值。JSO结构是这样的 { "type": "FeatureCollection", "properties": { "zoom": 14, "x": 12302, "y": 7075 }, "features": [ { "type": "FeatureCollection", "pr

我试图从JSON文件中导入一些数据。JSON文件是嵌套的,我想导入子值。JSO结构是这样的

{
    "type": "FeatureCollection",
    "properties": {
        "zoom": 14,
        "x": 12302,
        "y": 7075
    },
    "features": [
        {
            "type": "FeatureCollection",
            "properties": {
                "layer": "poi",
                "version": 3,
                "extent": 4096
            },
            "features": [
                {
                    "type": "Feature",
                    "id": 4356,
                    "properties": {
                        "fid": "eg-34678h765",
                        "name": "Brooklyn Children's Museum"
                    },
                    "geometry": {
                        "type": "Point",
                        "coordinates": [
                            -73.944030,
                            40.674427
                        ]
                    }
                }
            ]
        }
    ]
}
我想获取以下子值(就像我用JS调用它一样)

进入
myTable
标题列
id
fid
名称
经度
纬度

我提出了一个解决方案,但它只插入父值,如
type
properties
features
,通过
psql

copy temp_json from 'E:\myJson.json';

insert into myTable ("type", "properties", "features") 

select values->>'type' as type,
       values->>'properties' as properties,
       values->>'features' as features
from   (
           select json_array_elements(replace(values,'\','\\')::json) as values 
           from   temp_json
       ) a;
其中,
功能
作为
JSONB
插入

如何从JSON文件中获取所需字段并插入到表的目标列中?

试试这个

select j2->>'id' as id,
       j2->'properties'->>'fid'  as fid,
       j2->'properties'->>'name' as name,
       MAX( CASE WHEN l.k = 1 THEN l.cord end ) as longitude,
       MAX( CASE WHEN l.k = 2 THEN l.cord end ) as latitude
       from temp_json 
    cross join json_array_elements(values->'features') as j1
    cross join json_array_elements(j1->'features') as j2
    cross join json_array_elements_text(j2->'geometry'->'coordinates')
                                 with ordinality l(cord,k)
                                 GROUP BY 1,2,3

一种方法是使用TSV格式提取数据(例如),然后将其导入数据库

相关jq过滤器与您首选的格式非常相似:

features[0].features[]
| [.id, .properties.fid, .properties.name, .geometry.coordinates[:2][] ]
| @tsv
因为您的postgres脚本正在读取文件,所以它可能是最简单的 要在命令行上执行转换,请执行以下操作:

jq -f totsv.jq E:\myJson.json > myExtract.tsv
其中totsv.jq包含上面的jq脚本

jq -f totsv.jq E:\myJson.json > myExtract.tsv