使用 pyQGIS 在 PostGIS 中创建模式的 shapefile 的空间索引

Question

我正在为我拥有的每个 shapefile 创建一个空间索引，然后将它们导入模式，但空间索引丢失了。如何在模式中再次创建空间索引？

layers_fimport = QgsProject.instance().mapLayers().values()

for a in layers_fimport: 
    a.setCrs(QgsCoordinateReferenceSystem(2056))
    a.dataProvider().createSpatialIndex()

for layer in layers_fimport:
    mytable=layer.name()
    con_string = "dbname='xxxx' host='xxxxx' port='xxx' user='xxxx' password='xxxxx' key=id type=POLYLINE table='"+project_name+"'." + mytable + " (geom)"
    err = QgsVectorLayerExporter.exportLayer(layer, con_string, 'postgres', QgsCoordinateReferenceSystem(2056), False)

Spatial_Index_missing

Answer 1

所以经过一番研究，我找到了一种通过 pyQGIS 使用 SQL 的方法，并创建了空间索引。

import psycopg2
# Create a Spatial Index for the tables in the schema
#-----------------------------------------------------------------------
connection = psycopg2.connect (dbname = "xxxx",
                           user = "xxxxx",
                           password = "xxxxxx",
                           host = "xxxxxxxx",
                           )
cursor = connection.cursor()

#--No capital letters allowed (schema + tables)
#-------------------------------------------------------------- 

cursor.execute("CREATE INDEX sidx_l_abluft_geom ON test.l_abluft(geom);")
connection.commit()
print("Query successful")

使用 pyQGIS 在 PostGIS 中创建模式的 shapefile 的空间索引

Create a spatial Index of the shapefiles of a schema in PostGIS using pyQGIS

spatial-index

pyqgis