Question

我在PostgreSQL pgAdmin4查询工具中预先指定了geojson作为数据。我正在尝试将数据插入到表中，但由于我的JSON很大，所以不要手动执行Insert，而是执行此操作：

WITH data AS (SELECT '{ "type": "FeatureCollection",
"features": [
  { "type": "Feature",
    "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
    "properties": {"prop0": "value0"}
    },
  { "type": "Feature",
    "geometry": {
      "type": "LineString",
      "coordinates": [
        [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
        ]
      },
    "properties": {
      "prop0": "value0",
      "prop1": 0.0
      }
    }
   ]
 }'::json AS fc)

现在尝试将此数据插入到表格中：

INSERT INTO locations (gid, geom, properties) VALUES ( data );

它给我一个错误column data doesn't exist。但是当我这样做时：

SELECT
row_number() OVER () AS gid,
ST_AsText(ST_GeomFromGeoJSON(feat->>'geometry')) AS geom,
feat->'properties' AS properties
FROM (
 SELECT json_array_elements(fc->'features') AS feat
FROM data
 ) AS f;

此查询显示数据。我的问题是，当我想要时，我可以选择并查看数据，但因为这不是任何地方的存储所以每次我需要做WITH data as声明json并应用选择查询。所以我想在我的桌子上插入价值所以我可以随时调用它。

Answer 1

您应该能够直接使用SELECT代替VALUES声明，如下所示：

WITH data AS (SELECT '{ "type": "FeatureCollection",
"features": [
  { "type": "Feature",
    "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
    "properties": {"prop0": "value0"}
    },
  { "type": "Feature",
    "geometry": {
      "type": "LineString",
      "coordinates": [
        [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
        ]
      },
    "properties": {
      "prop0": "value0",
      "prop1": 0.0
      }
    }
   ]
 }'::json AS fc)
INSERT INTO locations (gid, geom, properties)
SELECT
row_number() OVER () AS gid,
ST_AsText(ST_GeomFromGeoJSON(feat->>'geometry')) AS geom,
feat->'properties' AS properties
FROM (
 SELECT json_array_elements(fc->'features') AS feat
FROM data
 ) AS f;

使用预先指定的json Postgresql在Table中插入数据

1 个答案: