@Query: 函数 ll_to_earth(double precision, double precision) 不存在

Question

我正在尝试实现以下查询，以便在给定位置 (lat,lng) 的特定半径（以米为单位）内获取地点：

@RepositoryRestResource(collectionResourceRel = "places", path = "places")
public interface PlaceRepository extends JpaRepository<PlaceEntity, Long> {

    @Query(value = "" +
            "SELECT p " +
            "FROM PlaceEntity p " +
            "WHERE earth_distance( " +
            "   ll_to_earth(p.latitude, p.longitude), " +
            "   ll_to_earth(latitude, longitude) " +
            ") < radius")
    List<PlaceEntity> findByLocationAndRadius(@Param("latitude") Float latitude,
                                              @Param("longitude") Float longitude,
                                              @Param("radius") Integer radius);
}

但是，运行它会抛出：

Caused by: org.postgresql.util.PSQLException: ERROR: function ll_to_earth(double precision, double precision) does not exist
  Hint: No function matches the given name and argument types. You might need to add explicit type casts.
  Position: 343
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2284)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2003)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:200)
    at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:424)
    at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:161)
    at org.postgresql.jdbc.PgPreparedStatement.executeQuery(PgPreparedStatement.java:114)
    at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52)
    at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:60)
    ... 76 more

我也尝试更改设置nativeQuery = true以及更改@Query为

@Query(value = "" +
        "SELECT p " +
        "FROM PlaceEntity p " +
        "WHERE FUNCTION('earth_distance', " +
        "   FUNCTION('ll_to_earth', p.latitude, p.longitude), " +
        "   FUNCTION('ll_to_earth', latitude, longitude) " +
        ") < radius")

结果相同。

什么是正确的语法？

Answer 1

从https://johanndutoit.net/searching-in-a-radius-using-postgres/我发现我必须安装一些扩展：

启动psql外壳：

psql postgres -h localhost -d <database-name>

执行：

<database-name>=# CREATE EXTENSION cube;
<database-name>=# CREATE EXTENSION earthdistance;

此外，nativeQuery = true正确设置和引用参数：

@Query(value = "" +
        "SELECT * " +
        "FROM place " +
        "WHERE earth_distance( " +
        "   ll_to_earth(place.latitude, place.longitude), " +
        "   ll_to_earth(:latitude, :longitude) " +
        ") < :radius", nativeQuery = true)
List<PlaceEntity> findByLocationAndRadius(@Param("latitude") Float latitude,
                                          @Param("longitude") Float longitude,
                                          @Param("radius") Integer radius);

注意：这可能会变慢。该链接显示了如何在必要时提高性能。