80 lines
3.1 KiB
Python
80 lines
3.1 KiB
Python
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"""
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一次性脚本：从 PostgreSQL 导出静态底图为 GeoPackage 文件。
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运行一次即可，之后服务直接读本地 GPKG。
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用法: python -m app.script.export_static_layers
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"""
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import os
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import sys
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import time
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# 确保项目根目录在 sys.path 中
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project_root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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if project_root not in sys.path:
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sys.path.insert(0, project_root)
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import geopandas as gpd
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from sqlalchemy import create_engine
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from config import settings
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# GPKG 输出目录（相对于项目根目录）
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GPKG_DIR = os.path.join(project_root, getattr(settings, "QGIS_GPKG_DIR", "app/data/gpkg"))
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# 静态图层定义: {显示名: (schema.table, geom_column, srid)}
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STATIC_LAYERS = {
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"水库": ("qgis.rivers", "Geometry", 0),
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"市州驻地": ("qgis.sx_capital", "geometry", 0),
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"河流": ("qgis.river", "Geometry", 0),
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"active_fault": ("qgis.active_fault", "Geometry", 0),
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"陕西省": ("qgis.sx", "Geometry", 0),
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"乡镇驻地": ("qgis.sx_street", "dgeom", 0),
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"区县驻地": ("qgis.sx_xa_county", "Geometry", 0),
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"县界": ("qgis.sx_xa_county_boundary", "Geometry", 0),
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"周边区县": ("qgis.sx_zb_county_boundary", "Geometry", 0),
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"周边市州": ("qgis.sx_zb_city", "Geometry", 4326),
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"周边县区": ("qgis.sx_zb_county", "Geometry", 0),
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"traffic_expressway": ("qgis.traffic_expressway", "Geometry", 0),
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"traffic_provincial": ("qgis.traffic_provincial", "Geometry", 0),
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"traffic_railway": ("qgis.traffic_railway", "Geometry", 0),
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"traffic_township": ("qgis.traffic_township", "Geometry", 0),
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"traffic_trunk_line": ("qgis.traffic_trunk_line", "Geometry", 0),
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}
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def export_layers():
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os.makedirs(GPKG_DIR, exist_ok=True)
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conn_str = (
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f"postgresql://{settings.DB_USER}:{settings.DB_PASSWORD}"
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f"@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"
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)
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engine = create_engine(conn_str)
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for layer_name, (table_ref, geom_col, srid) in STATIC_LAYERS.items():
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t0 = time.time()
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schema, table = table_ref.split(".", 1)
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print(f"导出 {layer_name} ({table_ref}) ...", end=" ", flush=True)
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try:
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sql = f'SELECT * FROM "{schema}"."{table}"'
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gdf = gpd.read_postgis(sql, engine, geom_col=geom_col)
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if srid and srid > 0:
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gdf = gdf.set_crs(epsg=srid, allow_override=True)
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elif gdf.crs is None:
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gdf = gdf.set_crs(epsg=4326)
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gpkg_path = os.path.join(GPKG_DIR, f"{table}.gpkg")
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gdf.to_file(gpkg_path, driver="GPKG")
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print(f"✓ {len(gdf)} 行, {time.time() - t0:.1f}s")
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except Exception as e:
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print(f"✗ 失败: {e}")
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engine.dispose()
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print(f"\n导出完成！文件目录: {GPKG_DIR}")
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if __name__ == "__main__":
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export_layers()
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