many-to-many relationship with TClientDataSet
I have two database tables:
- students table
- classes table
There is a many-to-many relationship between the two tables: a student can go to several classes and a class can have several students.
I would like to implement the tables in Delphi with TClientDatasets and have a TDBGrid which list all the students and a second TDBGrid which list all the classes which the currently selected student attends.
As far as I understand it I need a join table which establishes the relationship between the students and the classes table with the following fields:
- StudentID
- ClassID
But I don't know how to implement the relationships between the different TClientDatasets so that I get the TDBGrids working as described above.
database delphi many-to-many tclientdataset
asked Nov 23 '18 at 13:28
user3384674
318115
add a comment |
I have two database tables:
- students table
- classes table
There is a many-to-many relationship between the two tables: a student can go to several classes and a class can have several students.
I would like to implement the tables in Delphi with TClientDatasets and have a TDBGrid which list all the students and a second TDBGrid which list all the classes which the currently selected student attends.
As far as I understand it I need a join table which establishes the relationship between the students and the classes table with the following fields:
- StudentID
- ClassID
But I don't know how to implement the relationships between the different TClientDatasets so that I get the TDBGrids working as described above.
database delphi many-to-many tclientdataset
asked Nov 23 '18 at 13:28
user3384674
318115
In this case the fact that a class can contain several students is irrelevant. Build your index by student, then class within student.
– Dsm
Nov 23 '18 at 13:44
I think what you want is a master-detail relationship. Try to search for these keywords.
– nil
Nov 23 '18 at 15:15
add a comment |
I have two database tables:
- students table
- classes table
There is a many-to-many relationship between the two tables: a student can go to several classes and a class can have several students.
I would like to implement the tables in Delphi with TClientDatasets and have a TDBGrid which list all the students and a second TDBGrid which list all the classes which the currently selected student attends.
As far as I understand it I need a join table which establishes the relationship between the students and the classes table with the following fields:
- StudentID
- ClassID
But I don't know how to implement the relationships between the different TClientDatasets so that I get the TDBGrids working as described above.
database delphi many-to-many tclientdataset
asked Nov 23 '18 at 13:28
user3384674
318115
I have two database tables:
- students table
- classes table
There is a many-to-many relationship between the two tables: a student can go to several classes and a class can have several students.
I would like to implement the tables in Delphi with TClientDatasets and have a TDBGrid which list all the students and a second TDBGrid which list all the classes which the currently selected student attends.
As far as I understand it I need a join table which establishes the relationship between the students and the classes table with the following fields:
- StudentID
- ClassID
But I don't know how to implement the relationships between the different TClientDatasets so that I get the TDBGrids working as described above.
database delphi many-to-many tclientdataset
database delphi many-to-many tclientdataset
asked Nov 23 '18 at 13:28
user3384674
318115
asked Nov 23 '18 at 13:28
user3384674
318115
asked Nov 23 '18 at 13:28
user3384674
318115
asked Nov 23 '18 at 13:28
user3384674
318115
asked Nov 23 '18 at 13:28
user3384674
318115
318115
In this case the fact that a class can contain several students is irrelevant. Build your index by student, then class within student.
– Dsm
Nov 23 '18 at 13:44
I think what you want is a master-detail relationship. Try to search for these keywords.
– nil
Nov 23 '18 at 15:15
add a comment |
In this case the fact that a class can contain several students is irrelevant. Build your index by student, then class within student.
– Dsm
Nov 23 '18 at 13:44
I think what you want is a master-detail relationship. Try to search for these keywords.
– nil
Nov 23 '18 at 15:15
In this case the fact that a class can contain several students is irrelevant. Build your index by student, then class within student.
– Dsm
Nov 23 '18 at 13:44
In this case the fact that a class can contain several students is irrelevant. Build your index by student, then class within student.
– Dsm
Nov 23 '18 at 13:44
I think what you want is a master-detail relationship. Try to search for these keywords.
– nil
Nov 23 '18 at 15:15
I think what you want is a master-detail relationship. Try to search for these keywords.
– nil
Nov 23 '18 at 15:15
add a comment |
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In this case the fact that a class can contain several students is irrelevant. Build your index by student, then class within student.
– Dsm
Nov 23 '18 at 13:44
I think what you want is a master-detail relationship. Try to search for these keywords.
– nil
Nov 23 '18 at 15:15