PG :: UndefinedFunction：ERROR：運算符不存在：geometry && box

Question

爲什麼PostgreSQL會抱怨運算符&&不存在？ （我已經安裝了PostGIS - 見下文）。

mydb=# SELECT "monuments".* FROM "monuments" WHERE 
mydb=# (coord && '-10,-10,10,10'::box) 
mydb=# ORDER BY created_at DESC ; 
ERROR: operator does not exist: geometry && box 
LINE 1: ...LECT "monuments".* FROM "monuments" WHERE (coord && '-10... 
                  ^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. 

我已經安裝了PostGIS：

mydb=# select postgis_full_version(); 
NOTICE: Function postgis_topology_scripts_installed() not found. Is topology support enabled and topology.sql installed? 
                     postgis_full_version                  
---------------------------------------------------------------------------------------------------------------------------------------------------------------- 
POSTGIS="2.1.0 r11822" GEOS="3.3.8-CAPI-1.7.8" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.10.0, released 2013/04/24" LIBXML="2.9.1" LIBJSON="UNKNOWN" RASTER 

順便說一句，我的表是這樣的：

mydb=# \d monuments 
id | integer    | not null default nextval('monuments_id_seq'::regclass) 
coord | geometry(Point,3785) | 

讓我知道如果你需要任何更多的信息。

Answer 1

box是built-in PostgreSQL primitive geometric type，如point。

postgres=> \dT box 
         List of data types 
    Schema | Name |    Description     
------------+------+------------------------------------------ 
pg_catalog | box | geometric box '(lower left,upper right)' 
(1 row) 

PostGIS的使用itsowngeometry類型，一般不具有內置的基本幾何類型PostgreSQL的良好互操作。這些都是我的PostgreSQL 9.3 &&在PostGIS 2所支持的數據類型組合安裝：

postgres=# \do && 
           List of operators 
    Schema | Name | Left arg type | Right arg type | Result type | Description 
------------+------+---------------+----------------+-------------+----------------- 
pg_catalog | && | anyarray  | anyarray  | boolean  | overlaps 
pg_catalog | && | anyrange  | anyrange  | boolean  | overlaps 
pg_catalog | && | box   | box   | boolean  | overlaps 
pg_catalog | && | circle  | circle   | boolean  | overlaps 
pg_catalog | && | polygon  | polygon  | boolean  | overlaps 
pg_catalog | && | tinterval  | tinterval  | boolean  | overlaps 
pg_catalog | && | tsquery  | tsquery  | tsquery  | AND-concatenate 
public  | && | geography  | geography  | boolean  | 
public  | && | geometry  | geometry  | boolean  | 
public  | && | geometry  | raster   | boolean  | 
public  | && | raster  | geometry  | boolean  | 
public  | && | raster  | raster   | boolean  | 
(12 rows) 

你會看到，box是支持box && box但不box && geometry。由於您的coord列是geometry類型，因此您需要將box轉換爲geometry，以便最終以geometry && geometry結束。

例子：

WHERE (coord && geometry(polygon('((-10, -10), (10, 10))'::box))) 

Answer 2

最簡單的解釋是您將擴展安裝到某個不在您當前的search_path中的架構中。

你知道嗎，你甚至可以"schema-qualify" operators？像：

SELECT 3 OPERATOR(pg_catalog.+) 4; 

或者：

SELECT * FROM public.monuments 
WHERE coord OPERATOR(my_postgis_schema.&&) '-10,-10,10,10'::box); 

這種方式，您可以使獨立於當前search_path的查詢。儘管如此，要解決它。