在Hibernate中的表之间指定多个一对多关系

Question

I have two tables: Teams and Matches

The Teams table is made up as follows [Team ID, Team Name] The Matches table is made up as follows [Match ID, Home Team, Away Team, Result]

Home Team and Away Team are foreign keys from the Teams table therefore there are two one-to-many relationships defined between the Teams and Matches table.

I'm know how to specify single relationships between two tables but how can I specify multiple relationships between two tables? Is it the same process?

How can these relationships be specified in Hibernate?

Answer 1

You can have a uni-directional mapping between Teams and Matches as follows:

In Matches Class:

@ManyToOne(optional = false)
@JoinColumn(name = "home_team_id", referencedColumnName = "team_id")
private Team homeTeam;

@ManyToOne(optional = false)
@JoinColumn(name = "away_team_id", referencedColumnName = "team_id")
private Team awayTeam;

If you need a bi-directional relationship you can add the following :

In Teams Class :

@OneToMany(mappedBy = "homeTeam")
private Set<Matches> homeMatches;

@OneToMany(mappedBy = "awayTeam")
private Set<Matches> awayMatches;