Hibernate - how to remove redundant columns in an assossiation table
0
I have two entities: Intersection and Agent.
- An intersection has an id and a set of agents;
- An agent has a composite id compound by the intersection id and the agent id;
The generated table intersection_agents has tree columns: intersection_id, agents_agents_id and agents_intersection_id.
The intersection_id and agents_intersection_id are redudant. Which is the proper way to remove this redundancy?
EDIT 1:
Intersection.java
@Entity
public class Intersecion {
@Id
private String id;
@OneToMay
private Set<Agent> agents;
...
}
Agent.java
@Entity
public class Agent {
@EmbbededId
private PrimaryKey key;
@Embeddable
public static class PrimaryKey {
String intersectionId;
Long agentId;
}
}
java mysql hibernate
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
add a comment |
0
I have two entities: Intersection and Agent.
- An intersection has an id and a set of agents;
- An agent has a composite id compound by the intersection id and the agent id;
The generated table intersection_agents has tree columns: intersection_id, agents_agents_id and agents_intersection_id.
The intersection_id and agents_intersection_id are redudant. Which is the proper way to remove this redundancy?
EDIT 1:
Intersection.java
@Entity
public class Intersecion {
@Id
private String id;
@OneToMay
private Set<Agent> agents;
...
}
Agent.java
@Entity
public class Agent {
@EmbbededId
private PrimaryKey key;
@Embeddable
public static class PrimaryKey {
String intersectionId;
Long agentId;
}
}
java mysql hibernate
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
It does not seem that you really need intersection_agents table, because that mapping incapsulated in agent id. Provide your entities, plz.
– Aleksandr Semyannikov
Nov 15 '18 at 12:00
Edited. OBS: Don't know if it matters, but, the id's aren't autogenerated because is important for the user to recognize intersections and agents just looking at the id (for use on external systems).
– Hugo Sartori
Nov 15 '18 at 22:26
add a comment |
0
0
0
I have two entities: Intersection and Agent.
- An intersection has an id and a set of agents;
- An agent has a composite id compound by the intersection id and the agent id;
The generated table intersection_agents has tree columns: intersection_id, agents_agents_id and agents_intersection_id.
The intersection_id and agents_intersection_id are redudant. Which is the proper way to remove this redundancy?
EDIT 1:
Intersection.java
@Entity
public class Intersecion {
@Id
private String id;
@OneToMay
private Set<Agent> agents;
...
}
Agent.java
@Entity
public class Agent {
@EmbbededId
private PrimaryKey key;
@Embeddable
public static class PrimaryKey {
String intersectionId;
Long agentId;
}
}
java mysql hibernate
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
I have two entities: Intersection and Agent.
- An intersection has an id and a set of agents;
- An agent has a composite id compound by the intersection id and the agent id;
The generated table intersection_agents has tree columns: intersection_id, agents_agents_id and agents_intersection_id.
The intersection_id and agents_intersection_id are redudant. Which is the proper way to remove this redundancy?
EDIT 1:
Intersection.java
@Entity
public class Intersecion {
@Id
private String id;
@OneToMay
private Set<Agent> agents;
...
}
Agent.java
@Entity
public class Agent {
@EmbbededId
private PrimaryKey key;
@Embeddable
public static class PrimaryKey {
String intersectionId;
Long agentId;
}
}
java mysql hibernate
java mysql hibernate
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
edited Nov 15 '18 at 22:21
Hugo Sartori
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
asked Nov 14 '18 at 21:07
Hugo SartoriHugo Sartori
999
999
It does not seem that you really need intersection_agents table, because that mapping incapsulated in agent id. Provide your entities, plz.
– Aleksandr Semyannikov
Nov 15 '18 at 12:00
Edited. OBS: Don't know if it matters, but, the id's aren't autogenerated because is important for the user to recognize intersections and agents just looking at the id (for use on external systems).
– Hugo Sartori
Nov 15 '18 at 22:26
add a comment |
It does not seem that you really need intersection_agents table, because that mapping incapsulated in agent id. Provide your entities, plz.
– Aleksandr Semyannikov
Nov 15 '18 at 12:00
Edited. OBS: Don't know if it matters, but, the id's aren't autogenerated because is important for the user to recognize intersections and agents just looking at the id (for use on external systems).
– Hugo Sartori
Nov 15 '18 at 22:26
It does not seem that you really need intersection_agents table, because that mapping incapsulated in agent id. Provide your entities, plz.
– Aleksandr Semyannikov
Nov 15 '18 at 12:00
It does not seem that you really need intersection_agents table, because that mapping incapsulated in agent id. Provide your entities, plz.
– Aleksandr Semyannikov
Nov 15 '18 at 12:00
Edited. OBS: Don't know if it matters, but, the id's aren't autogenerated because is important for the user to recognize intersections and agents just looking at the id (for use on external systems).
– Hugo Sartori
Nov 15 '18 at 22:26
Edited. OBS: Don't know if it matters, but, the id's aren't autogenerated because is important for the user to recognize intersections and agents just looking at the id (for use on external systems).
– Hugo Sartori
Nov 15 '18 at 22:26
add a comment |
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It does not seem that you really need intersection_agents table, because that mapping incapsulated in agent id. Provide your entities, plz.
– Aleksandr Semyannikov
Nov 15 '18 at 12:00
Edited. OBS: Don't know if it matters, but, the id's aren't autogenerated because is important for the user to recognize intersections and agents just looking at the id (for use on external systems).
– Hugo Sartori
Nov 15 '18 at 22:26