我有两张表，第一个国家第二个是使用 ST_contains 查询的国家，该国家是否在国内

Question

我是 postGIS 新手，对这些查询感到头疼......我需要一些帮助

我有两个表，第一个是country(cid int,countryname text,coutrycoordinates geometry)，另一个是state(sid int,statename text,statecoordinates geometry)，其中我必须使用国内的ST_contains 写一个查询，但是我的查询不起作用

现在假设我已经插入

INSERT into country  VALUES (
1,'country1',
'POLYGON ((1 5,4 5,4 7,1 7,1 5))');

INSERT into state  VALUES (
1,'state1',
'POLYGON ((2 5,3 5,3 6,2 6,2 5))');

工作并被插入，但是为几何列存储的值是这种类型的

01030000000100000005000000000000000000F03F000000000000F03F000000000000F03F0000000000001040000000000000104000000000000010400000000000001040000000000000F03F000000000000F03F000000000000F03F for country and 

010300000001000000050000000000000000000040000000000000004000000000000000400000000000000840000000000000084000000000000008400000000000000840000000000000004000000000000000400000000000000040  for state in the postreSQL db 

我有一个带有 2 个文本字段的网页和一个带有 ST_Contains 和 ST_Intersects 的下拉菜单，单击时提交按钮应显示状态是否位于该国家/地区。

select c.cid  from country as c, state as s  where ST_Contains('POLYGON ((1 1,1 4,4 4,4 1,1 1))', 'POLYGON ((2 2,2 3, 3 3, 3 2, 2 2))') 

上述方法有效，但选择了两个表中交叉连接的所有行，而不仅仅是c.cid.

select c.cid from country as c, state as s  where ST_Contains(
01030000000100000005000000000000000000F03F000000000000F03F000000000000F03F0000000000001040000000000000104000000000000010400000000000001040000000000000F03F000000000000F03F000000000000F03F, 010300000001000000050000000000000000000040000000000000004000000000000000400000000000000840000000000000084000000000000008400000000000000840000000000000004000000000000000400000000000000040)

如果这是查询则返回错误

NOTICE:  identifier "f03f000000000000f03f000000000000f03f0000000000001040000000000000104000000000000010400000000000001040000000000000f03f000000000000f03f000000000000f03f" will be truncated to "f03f000000000000f03f000000000000f03f000000000000104000000000000"
ERROR:  syntax error at or near "F03F000000000000F03F000000000000F03F0000000000001040000000000000104000000000000010400000000000001040000000000000F03F000000000000F03F000000000000F03F"
LINE 2: 01030000000100000005000000000000000000F03F000000000000F03F00...
                                              ^

这是在我编写此代码的 php 页面中执行的那个

请问我哪里出错了。

Answer 1

你快到了，只是缺少引号：

select c.cid from country as c, state as s  where ST_Contains(
'01030000000100000005000000000000000000F03F000000000000F03F000000000000F03F0000000000001040000000000000104000000000000010400000000000001040000000000000F03F000000000000F03F000000000000F03F', '010300000001000000050000000000000000000040000000000000004000000000000000400000000000000840000000000000084000000000000008400000000000000840000000000000004000000000000000400000000000000040')

“奇怪”的几何形状是因为 Postgres 将 Polygon 转换为 geometry。您可以使用ST_AsText()再次将它们转换为文本

SELECT ST_AsText( state1 ) FROM state;