昨天有人告诉我,如果我想使用Sqlalchemy,Geoalchemy是支持空间延伸的良好选择。 这确实是好的。 非常感谢他。
但是,我没有找到一种方便的方式来制定具有地质构造的空间指数。 我是否应该直接管理这一结构?
CREATE SPATIAL INDEX sp_index ON my_class (
geom_col
);
是否有一种方便的方法,不直接撰写文件。
感谢!
昨天有人告诉我,如果我想使用Sqlalchemy,Geoalchemy是支持空间延伸的良好选择。 这确实是好的。 非常感谢他。
但是,我没有找到一种方便的方式来制定具有地质构造的空间指数。 我是否应该直接管理这一结构?
CREATE SPATIAL INDEX sp_index ON my_class (
geom_col
);
是否有一种方便的方法,不直接撰写文件。
感谢!
在建立一个有<代码>的表格时()。 GeoAlchemy将自动为地貌相列设定一个指数。
此外,Alchemy Index
s 例有create方法。 See the “Indexes” section in http://docs.sqlalchemy.org/en/rel_0_7/core/schema.html#metadata-constraints 。 我不敢肯定,你是否能够在我的SQL中建立一个空间指数,但值得尝试。
With GeoAlchemy, there are 2 steps you should take to create Spatial Index on the geometry column
例:
# note that spatial_index will set the column to not null
class Building(Base):
geom = GeometryColumn(Point(2, spatial_index=True))
GeometryDDL(Building.__table__)
I noticed that there were some threads with similar questions, and I did look through them but did not really get a convincing answer. Here s my question: The subquery below returns a Table with 3 ...
<?php $con=mysql_connect("localhost","mts","mts"); if(!con) { die( unable to connect . mysql_error()); } mysql_select_db("mts",$con); /* date_default_timezone_set ("Asia/Calcutta"); $date = ...
我把我的用心从使用QQL转向MySQL。 它与凯科特合作,现在不工作,因为我已经改变,使用MySQL。 这里的错误信息是:
We have a restaurant table that has lat-long data for each row. We need to write a query that performs a search to find all restaurants within the provided radius e.g. 1 mile, 5 miles etc. We have ...
Is it possible in php to return a specific row of data from a mysql query? None of the fetch statements that I ve found return a 2 dimensional array to access specific rows. I want to be able to ...
Our website was developed with a meta tag set to... <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> This works fine for M-dashes and special quotes, etc. However, I ...
What are some of the strategies being used for pagination of data sets that involve complex queries? count(*) takes ~1.5 sec so we don t want to hit the DB for every page view. Currently there are ~...
My table looks like person_id | car_id | miles ------------------------------ 1 | 1 | 100 1 | 2 | 200 2 | 3 | 1000 2 | 4 | 500 I need to ...