如何根据同一列中另一列的几何形状将值插入列 table

Question

我在下面发布了数据库 table。两列 geometryOfCellRepresentativeToTreatment 和 geometryOfCellRepresentativeToBuffer 是几何类型。并且它们的值等于列的几何形状 fourCornersRepresentativeToTreatmentAsGeoJSON_ 和 fourCornersRepresentativeToBufferAsGeoJSON 分别。我如何将值作为前几列的几何形状插入后几列

table:

CREATE TABLE grid_cell_data (
           id SERIAL PRIMARY KEY,
           isTreatment boolean,
           isBuffer boolean,
           fourCornersRepresentativeToTreatmentAsGeoJSON text,
           fourCornersRepresentativeToBufferAsGeoJSON text,
           distanceFromCenterPointOfTreatmentToNearestEdge numeric,
           distanceFromCenterPointOfBufferToNearestEdge numeric,
           areasOfCoveragePerWindowForCellsRepresentativeToTreatment numeric,
           areasOfCoveragePerWindowForCellsRepresentativeToBuffer numeric,
           averageHeightsPerWindowRepresentativeToTreatment numeric,
           averageHeightsPerWindowRepresentativeToBuffer numeric,
           geometryOfCellRepresentativeToTreatment geometry,
           geometryOfCellRepresentativeToBuffer geometry)

data_to_be_inserted:

isTreatment = True//boolean
        isBuffer = False //boolean
        fourCornersRepresentativeToTreatmentAsGeoJSON_ = json.dumps(fourCornersOfKeyWindowAsGeoJSON[i])//string
        fourCornersRepresentativeToBufferAsGeoJSON_ = None//string
        distanceFromCenterPointOfTreatmentToNearestEdge_ = distancesFromCenterPointsToNearestEdge[i]
        distanceFromCenterPointOfBufferToNearestEdge_ = None
        areasOfCoveragePerWindowForCellsRepresentativeToTreatment_= areasOfCoveragePerWindow[i]
        areasOfCoveragePerWindowForCellsRepresentativeToBuffer_ = None
        averageHeightsPerWindowRepresentativeToTreatment_ = averageHeightsPerWindow[i]
        averageHeightsPerWindowRepresentativeToBuffer_ = None
        geometryOfCellRepresentativeToTreatment_ = //geometry of fourCornersRepresentativeToTreatmentAsGeoJSON_
        geometryOfCellRepresentativeToBuffer_ = //geometry of fourCornersRepresentativeToBufferAsGeoJSON_

图片

Answer 1

只需将 geojson 字符串设置为 UPDATE 语句中的 geometry 列（为了使其更明确，将 :: 字符串转换为 geometry) :

UPDATE grid_cell_data SET
  geometryOfCellRepresentativeToTreatment = fourCornersRepresentativeToTreatmentAsGeoJSON::geometry,
  geometryOfCellRepresentativeToBuffer = fourCornersRepresentativeToBufferAsGeoJSON::geometry;

代码:

UPDATE grid_cell_data set 
    geometryOfCellRepresentativeToTreatment = ST_GeomFromGeoJSON(fourCornersRepresentativeToTreatmentAsGeoJSON)
 WHERE 
    fourCornersRepresentativeToTreatmentAsGeoJSON <> '' and fourCornersRepresentativeToTreatmentAsGeoJSON IS NOT NULL;

UPDATE grid_cell_data SET
    geometryOfCellRepresentativeToBuffer = ST_GeomFromGeoJSON(fourCornersRepresentativeToBufferAsGeoJSON)
WHERE 
    fourCornersRepresentativeToBufferAsGeoJSON <> '' and fourCornersRepresentativeToBufferAsGeoJSON IS NOT NULL;

link 至 fiddle： fiddle code

注意：您在同一记录中两次存储相同的几何图形，这并不是真正必要的。您应该这样存储几何图形，并且仅按需以您想要的格式序列化它们，例如WKT、KML、GeoJSON 等

如何根据同一列中另一列的几何形状将值插入列 table

How to insert value to a column as a result of geometry of another column in the same table

sql

postgresql

postgis

sql-update