Updating inverse side bidirectional association The Next CEO of Stack OverflowDatabase design...
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Updating inverse side bidirectional association
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I understand (more or less) the concept of unidirectional and bidirectional association in a relationship, but I don't see the correct practical application of it.
For example, I want an contact table which contains a FK for the country, so I don't have to store the countries every time I create an address but just keep a reference to an already existing country.
As far as I understand, this should be a ManyToOne relationship contact(M) --> country(1) as one contact can only have one country but one country can be used by many contacts. This makes contacts the ONWING side of the relationship and country the INVERSE side as contact will hold the FK.
In the Doctrine documentation I read that it will only look after changes in the owning side. Does this mean that the table contact won't be updated if a country ID changes, which is exactly what I want it to do?
Also, what I would need is to get the country name to join it in the contact entry and not in reverse. This is the purpose of the bidirectional association, right?
Hope not be messing things up (too much)
mysql relational-theory orm
asked Aug 6 '15 at 18:40
lusoluso
1085
bumped to the homepage by Community♦ 4 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I understand (more or less) the concept of unidirectional and bidirectional association in a relationship, but I don't see the correct practical application of it.
For example, I want an contact table which contains a FK for the country, so I don't have to store the countries every time I create an address but just keep a reference to an already existing country.
As far as I understand, this should be a ManyToOne relationship contact(M) --> country(1) as one contact can only have one country but one country can be used by many contacts. This makes contacts the ONWING side of the relationship and country the INVERSE side as contact will hold the FK.
In the Doctrine documentation I read that it will only look after changes in the owning side. Does this mean that the table contact won't be updated if a country ID changes, which is exactly what I want it to do?
Also, what I would need is to get the country name to join it in the contact entry and not in reverse. This is the purpose of the bidirectional association, right?
Hope not be messing things up (too much)
mysql relational-theory orm
asked Aug 6 '15 at 18:40
lusoluso
1085
bumped to the homepage by Community♦ 4 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I understand (more or less) the concept of unidirectional and bidirectional association in a relationship, but I don't see the correct practical application of it.
For example, I want an contact table which contains a FK for the country, so I don't have to store the countries every time I create an address but just keep a reference to an already existing country.
As far as I understand, this should be a ManyToOne relationship contact(M) --> country(1) as one contact can only have one country but one country can be used by many contacts. This makes contacts the ONWING side of the relationship and country the INVERSE side as contact will hold the FK.
In the Doctrine documentation I read that it will only look after changes in the owning side. Does this mean that the table contact won't be updated if a country ID changes, which is exactly what I want it to do?
Also, what I would need is to get the country name to join it in the contact entry and not in reverse. This is the purpose of the bidirectional association, right?
Hope not be messing things up (too much)
mysql relational-theory orm
asked Aug 6 '15 at 18:40
lusoluso
1085
I understand (more or less) the concept of unidirectional and bidirectional association in a relationship, but I don't see the correct practical application of it.
For example, I want an contact table which contains a FK for the country, so I don't have to store the countries every time I create an address but just keep a reference to an already existing country.
As far as I understand, this should be a ManyToOne relationship contact(M) --> country(1) as one contact can only have one country but one country can be used by many contacts. This makes contacts the ONWING side of the relationship and country the INVERSE side as contact will hold the FK.
In the Doctrine documentation I read that it will only look after changes in the owning side. Does this mean that the table contact won't be updated if a country ID changes, which is exactly what I want it to do?
Also, what I would need is to get the country name to join it in the contact entry and not in reverse. This is the purpose of the bidirectional association, right?
Hope not be messing things up (too much)
mysql relational-theory orm
mysql relational-theory orm
asked Aug 6 '15 at 18:40
lusoluso
1085
asked Aug 6 '15 at 18:40
lusoluso
1085
asked Aug 6 '15 at 18:40
lusoluso
1085
asked Aug 6 '15 at 18:40
lusoluso
1085
asked Aug 6 '15 at 18:40
lusoluso
1085
1085
bumped to the homepage by Community♦ 4 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 4 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Huh? Sounds like the textbooks are making things too complicated, with too much terminology.
Yes, "country" involves a many:1 relationship. Yes there are 2 tables. Yes, country_id is in both tables. OK, you could have a FK relationship. Or you could simply make sure you insert into Countries whenever you come across a new country.
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
add a comment |
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Huh? Sounds like the textbooks are making things too complicated, with too much terminology.
Yes, "country" involves a many:1 relationship. Yes there are 2 tables. Yes, country_id is in both tables. OK, you could have a FK relationship. Or you could simply make sure you insert into Countries whenever you come across a new country.
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
add a comment |
Huh? Sounds like the textbooks are making things too complicated, with too much terminology.
Yes, "country" involves a many:1 relationship. Yes there are 2 tables. Yes, country_id is in both tables. OK, you could have a FK relationship. Or you could simply make sure you insert into Countries whenever you come across a new country.
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
add a comment |
Huh? Sounds like the textbooks are making things too complicated, with too much terminology.
Yes, "country" involves a many:1 relationship. Yes there are 2 tables. Yes, country_id is in both tables. OK, you could have a FK relationship. Or you could simply make sure you insert into Countries whenever you come across a new country.
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
Huh? Sounds like the textbooks are making things too complicated, with too much terminology.
Yes, "country" involves a many:1 relationship. Yes there are 2 tables. Yes, country_id is in both tables. OK, you could have a FK relationship. Or you could simply make sure you insert into Countries whenever you come across a new country.
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
answered Aug 7 '15 at 4:25
Rick JamesRick James
43.7k22259
43.7k22259
add a comment |
add a comment |
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