将geojson数据导出到PostgreSQL时出现问题

Question

我正在尝试将

geojson

数据导出到 PostgreSQL 中的表中。我在

geojson

中有多个

directory

文件作为输入传递给 PostgreSQL 函数。我循环遍历该目录中的所有文件名，然后使用

pg_read_file

读取文件数据，然后尝试构建

geojson_data

对象，然后我可以使用该对象在表中插入值。

我写的

plpgsql

函数是：

CREATE OR REPLACE FUNCTION insert_geojson_data(directory text) RETURNS void AS $$
DECLARE
    file_name text;
    geojson_data json;
begin
    -- Loop through GeoJSON files in the specified directory
    FOR file_name IN 
        SELECT *
        FROM pg_ls_dir(directory)
    loop
        -- Read GeoJSON data from file
        IF file_name LIKE '%.geojson' then
       
        RAISE NOTICE 'GeoJSON data: %', pg_read_file(directory || '/' || file_name);
        EXECUTE 'SELECT jsonb_agg(features) FROM jsonb_array_elements_text(($1::jsonb)->>''features'')'
            INTO geojson_data
            USING pg_read_file(directory || '/' || file_name);

        -- Insert data into the states table
        INSERT INTO states (shapeId, name, geometry)
        select
            geojson_data->>'properties'->>'shapeId',
            geojson_data->>'properties'->>'name',
            ST_GeomFromGeoJSON(geojson_data->>'geometry');
           
        RAISE NOTICE 'Data from % inserted successfully', file_name;
        END IF;
    END LOOP;
    RETURN;
END;
$$ LANGUAGE plpgsql;

现在，当我使用目录路径执行该函数时：

SELECT public.insert_geojson_data('path/to/directory');

我已经放了一个

RAISE NOTICE 'GeoJSON data: %', pg_read_file(directory || '/' || file_name);

打印效果如下：

GeoJSON data: {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "crs": {
          "type": "name",
          "properties": {
            "name": "EPSG:4326"
          }
        },
        "type": "Polygon",
        "coordinates": [
          [
            [95.23729640200742, 26.679843368876448],
            [95.2356467872695, 26.68178477135018],
            [95.23566295528121, 26.68507127991569],
            [95.2504579873463, 26.685907840974153],
            [95.24362625324903, 26.687443945981386],
            [95.24011046522583, 26.685192466259366],
            [95.23729640200742, 26.679843368876448]
          ]
        ]
      },
      "properties": {
        "shapeId": "fc13a047-aaac-4e9e-ba39-5544f0ffb21c",
        "type": "State",
        "iso_group": "IND",
        "name": "Arunanchal Pradesh",
        "admin_level": 3
      }
    }
  ]
}

但是之后我收到了错误

SQL Error [42883]: ERROR: function jsonb_array_elements_text(text) does not exist
  Hint: No function matches the given name and argument types. You might need to add explicit type casts.
  Where: PL/pgSQL function insert_geojson_data(text) line 15 at EXECUTE

问题似乎出在下面的代码中，我无法弄清楚，希望在这里得到一些帮助。谢谢！

EXECUTE 'SELECT jsonb_agg(features) FROM jsonb_array_elements_text(($1::jsonb)->>''features'')'
            INTO geojson_data
            USING pg_read_file(directory || '/' || file_name);

Answer 1

问题是您使用的

->>

运算符将属性值转换为

text

，这不是您想要的。请改用

->

，它会返回

json(b)

类型的值。

顺便说一句，没有理由在函数中使用

EXECUTE

动态 SQL：

SELECT jsonb_agg(features) INTO geojson_data
FROM jsonb_array_elements_text((pg_read_file(directory || '/' || file_name)::jsonb)->'features');