相关疑难解决方法(0)

我有以下简单表:

CREATE TABLE tbl_test
(
  id serial NOT NULL,
  poly polygon NOT NULL
)
WITH (OIDS=FALSE);

然后我尝试插入一个带有多边形的行:

insert into tbl_test values(1, PolyFromText('POLYGON((0 0, 10 10, 10 0, 0 0))'))

并遇到这个错误:

列"poly"的类型为polygon,但expression的类型为geometry

哪个是蹩脚的.所以我的第一个问题是:

1. 我真的要演员吗？

无论如何,在投射后它起作用.现在我正在尝试做一个简单的ST_Contains查询:

select id, poly from tbl_test where ST_Contains(poly, Point(GeomFromText('POINT(9 2)')))

这给出了错误:

ERROR:  function st_contains(polygon, point) does not exist
LINE 1: select id, poly from tbl_test where ST_Contains(poly, Point(...
                                            ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts. …