sql - OrientDB SQL 查询模拟多对多连接

Question

鉴于使用 OrientDB 文档 API 创建的以下架构:

    OClass team = getoDocDatabase().getMetadata().getSchema().createClass(TEAM);
    team.createProperty(NAME, OType.STRING);

    OClass driver = getoDocDatabase().getMetadata().getSchema().createClass(DRIVER);
    driver.createProperty(NAME, OType.STRING);

    OClass car = getoDocDatabase().getMetadata().getSchema().createClass(CAR);
    car.createProperty(NAME, OType.STRING);

    // Relationships
    team.createProperty(CARS_HERITAGE, OType.LINKSET, car);
    car.createProperty(BUILT_BY, OType.LINK, team);
    car.createProperty(DRIVEN_BY, OType.LINKSET, driver);
    driver.createProperty(DRIVER_OF, OType.LINKSET, car);

获取费尔南多·阿隆索效力过的所有车队的 SQL 查询是什么？

在关系 SQL 中就像这样简单

SELECT team.name FROM {the join} where driver.name = 'Fernando Alonso'

Answer 1

我尝试过这个数据库

create class Team
CREATE PROPERTY Team.name String

create class DRIVER
CREATE PROPERTY DRIVER.name String

create class Car
CREATE PROPERTY Car.name String

CREATE PROPERTY Team.CARS_HERITAGE LINKSET Car
CREATE PROPERTY Car.BUILT_BY LINK Team
CREATE PROPERTY Car.DRIVEN_BY LINKSET DRIVER
CREATE PROPERTY DRIVER.DRIVER_OF LINKSET Car

插入

INSERT INTO TEAM(name) values ("Ferrari"),("Renault") // Ferrari 12:0  Renault 12:1
insert into Driver(name) values ("Fernando Alonso"),("Giancarlo Fisichella") // Alonso 13:0  Fisichella 13:1
insert into car(name,BUILT_BY,DRIVEN_BY) values ("car ferrari",#12:0,[#13:0,#13:1])
insert into car(name,BUILT_BY,DRIVEN_BY) values ("car renault",#12:1,[#13:0])

查询

select BUILT_BY.name as TeamName from car where DRIVEN_BY.name contains "Fernando Alonso"

希望有帮助。

更新1

select distinct(BUILT_BY.name) as team from car where DRIVEN_BY.name contains "Fernando Alonso"

来自 JAVA API

更新2

来自 JAVA API