刚开始使用postgis和hibernate statial,我就会遇到一些问题。
目标:从(其)几何类型对象获取博物馆
在我的数据库中,我得到了这一栏:
name: geom
type: geometry(Point,4326))
that contains something like: 0101000020E6100000004C8E1516D(...)
for each museum
然后,我有一个博物馆课:
@Column(name = "geom", columnDefinition = "geometry(Point,4326)")
private Geometry geometry;
这是我的疑问:
WKTReader fromText = new WKTReader();
try {
//LON and LAT are the museum's coordinates
Geometry geom = fromText.read("POINT("+lon+" "+lat+")");
Session hibernateSession = getCurrentSession();
Museum result = hibernateSession
.createQuery("from Museum where geometry = :geometry")
.setParameter("geometry", geom).uniqueResult();
return result;
} catch (ParseException e) {
(...)
}
但是当我尝试执行它时,我得到了这个错误:
ERROR: operator is not unique: geometry = bytea
Indice : Could not choose a best candidate operator. You might need to add explicit type casts.
所以我在想,也许来自冬眠的几何图形和Postgis的几何图形是不一样的? 关于如何使其发挥作用的任何想法?
谢谢!
答案 0 :(得分:2)
我发现了问题。
首先,我要确保在我的.properties文件中使用postgis方言。
添加此Setter以具有相同的SRID
geom.setSRID(4326);
然后我将查询更改为:
.createQuery("from Museum where equals(geometry, :geometry) = true")
还将我的db类改为:
@Column(name = "geom", columnDefinition = "Geometry")
现在完美运作。这可能会帮助有同样问题的人......
玩得开心
答案 1 :(得分:1)
我能够使用休眠功能将'geometry'数据存储在postgis表中。
我的pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-spatial</artifactId>
<version>5.4.2.Final</version>
</dependency>
休眠实体:
@Entity
public class XYZ {
@EmbeddedId
private Key id;
@Column(columnDefinition = "Geometry")
private Point startLoc;
@Column(columnDefinition = "Geometry")
private Point endLoc;
}
DAOImpl:
Point start = new GeometryFactory().createPoint(newCoordinate(151.203446,
-33.867347, 1550285443));
start.setSRID(4283);
Point end= new GeometryFactory().createPoint(new Coordinate(151.203446,
-33.867347, 1550285443));
end.setSRID(4283);
summary.setId(key);
try {
summary.setStartLoc( start);
summary.setEndLoc( start);
} catch (Exception e){
}
iSaferJourneySummaryDAO.save(summary);
}
PostGIS列类型:几何