Hi all,
I'm not sure exactly what words to use or how to Google this. (I keep
coming up with BOL links.) So, I'm going to ask the group for a
starting point or proper terms to even describe what I'm doing. Is
this a "thread handler? Or a "hierarchy tree" or what?
-----------------------
Basically, I'm working on a project that will be a task and project
tracking tool. What I've been asked to do is provide functionality
for two things at a Manager level.
1. Radar lists
2. sub projects.
Both of them involve the possibility of having a
1. Project
1.A Subproject
1.A.i. Sub-sub-project
....to infinity.
1.B Subproject b
1.B.i Sub-sub project b.
I'd like to be able to sort them out like Windows Explorer does
directories. Or like a usenet reader or a blog site handles threads.
I know to relate the table to itself by having a table structure
like...
ProjectID
ProjectTitle
ParentProjectID
Where ParentProjectID is another ProjectID in the list. i.e. The
example I typed above would be something like this...
1, Project, null
2, Subproject, 1
3, sub-sub-project, 2
4, subproject b, 1
5, sub-sub-project b, 4
But, I haven't been able to figure out a method for queries that
somehow discerns what is a top level, second level, third level, etc
item for the purposes of queries and reports.
-------
Anyway, I assume this is a standard method for database writers that
has a standard name. So, if anyone can let me in on that, I'd
appreciate it so I can start learning! :)
Many TIA,
Jon
3  1825 
On Feb 21, 5:39 pm, "jonceramic" <joncera...@gmail.comwrote:
Hi all,
I'm not sure exactly what words to use or how to Google this. (I keep
coming up with BOL links.) So, I'm going to ask the group for a
starting point or proper terms to even describe what I'm doing. Is
this a "thread handler? Or a "hierarchy tree" or what?
-----------------------
Basically, I'm working on a project that will be a task and project
tracking tool. What I've been asked to do is provide functionality
for two things at a Manager level.
1. Radar lists
2. sub projects.
Both of them involve the possibility of having a
1. Project
1.A Subproject
1.A.i. Sub-sub-project
...to infinity.
1.B Subproject b
1.B.i Sub-sub project b.
I'd like to be able to sort them out like Windows Explorer does
directories. Or like a usenet reader or a blog site handles threads.
I know to relate the table to itself by having a table structure
like...
ProjectID
ProjectTitle
ParentProjectID
Where ParentProjectID is another ProjectID in the list. i.e. The
example I typed above would be something like this...
1, Project, null
2, Subproject, 1
3, sub-sub-project, 2
4, subproject b, 1
5, sub-sub-project b, 4
But, I haven't been able to figure out a method for queries that
somehow discerns what is a top level, second level, third level, etc
item for the purposes of queries and reports.
-------
Anyway, I assume this is a standard method for database writers that
has a standard name. So, if anyone can let me in on that, I'd
appreciate it so I can start learning! :)
Many TIA,
Jon
I think you are talking about two different things, a datasource or
recordset and a method to present it. The control that Windows
explorer uses is called a TreeView control and is usually used with a
ListView control or something similar to display related objects or
information. They are not directly connected to a set of data so it
will require some extra patience to implement. You should spend a good
amount of time learning about these two controls before attacking the
recordset part of it as the methods to present it may influence how
you gather the data.
If they are not outlined in Access help, then check the MSDN site.
There should be a fair amount of info there.
Look up "Nested Sets" and "Adjacency Model". These are the two major
styles. The one that you are working on is called the Adjacencty
Model.
In browsing through these you see lots of nonsense about whether A or
B is normalised or not.
Main Difference:
Adjacency Model - easy to update, slow to query (must use recursion)
Nested Sets - easy to query (simple SQL), must update half of
recordset for every update.
I'm still waiting to find out how to represent a "forest" in a nested
set model.
Cheers,
Jason Lepack
On Feb 21, 5:39 pm, "jonceramic" <joncera...@gmail.comwrote:
Hi all,
I'm not sure exactly what words to use or how to Google this. (I keep
coming up with BOL links.) So, I'm going to ask the group for a
starting point or proper terms to even describe what I'm doing. Is
this a "thread handler? Or a "hierarchy tree" or what?
-----------------------
Basically, I'm working on a project that will be a task and project
tracking tool. What I've been asked to do is provide functionality
for two things at a Manager level.
1. Radar lists
2. sub projects.
Both of them involve the possibility of having a
1. Project
1.A Subproject
1.A.i. Sub-sub-project
...to infinity.
1.B Subproject b
1.B.i Sub-sub project b.
I'd like to be able to sort them out like Windows Explorer does
directories. Or like a usenet reader or a blog site handles threads.
I know to relate the table to itself by having a table structure
like...
ProjectID
ProjectTitle
ParentProjectID
Where ParentProjectID is another ProjectID in the list. i.e. The
example I typed above would be something like this...
1, Project, null
2, Subproject, 1
3, sub-sub-project, 2
4, subproject b, 1
5, sub-sub-project b, 4
But, I haven't been able to figure out a method for queries that
somehow discerns what is a top level, second level, third level, etc
item for the purposes of queries and reports.
-------
Anyway, I assume this is a standard method for database writers that
has a standard name. So, if anyone can let me in on that, I'd
appreciate it so I can start learning! :)
Many TIA,
Jon
On Feb 21, 4:57 pm, "Jason Lepack" <jlep...@gmail.comwrote:
Look up "Nested Sets" and "Adjacency Model". These are the two major
styles. The one that you are working on is called the Adjacencty
Model.
In browsing through these you see lots of nonsense about whether A or
B is normalised or not.
Main Difference:
Adjacency Model - easy to update, slow to query (must use recursion)
Nested Sets - easy to query (simple SQL), must update half of
recordset for every update.
I'm still waiting to find out how to represent a "forest" in a nested
set model.
Cheers,
Jason Lepack
On Feb 21, 5:39 pm, "jonceramic" <joncera...@gmail.comwrote:
Hi all,
I'm not sure exactly what words to use or how to Google this. (I keep
coming up with BOL links.) So, I'm going to ask the group for a
starting point or proper terms to even describe what I'm doing. Is
this a "thread handler? Or a "hierarchy tree" or what?
-----------------------
Basically, I'm working on a project that will be a task and project
tracking tool. What I've been asked to do is provide functionality
for two things at a Manager level.
1. Radar lists
2. sub projects.
Both of them involve the possibility of having a
1. Project
1.A Subproject
1.A.i. Sub-sub-project
...to infinity.
1.B Subproject b
1.B.i Sub-sub project b.
I'd like to be able to sort them out like Windows Explorer does
directories. Or like a usenet reader or a blog site handles threads.
I know to relate the table to itself by having a table structure
like...
ProjectID
ProjectTitle
ParentProjectID
Where ParentProjectID is another ProjectID in the list. i.e. The
example I typed above would be something like this...
1, Project, null
2, Subproject, 1
3, sub-sub-project, 2
4, subproject b, 1
5, sub-sub-project b, 4
But, I haven't been able to figure out a method for queries that
somehow discerns what is a top level, second level, third level, etc
item for the purposes of queries and reports.
-------
Anyway, I assume this is a standard method for database writers that
has a standard name. So, if anyone can let me in on that, I'd
appreciate it so I can start learning! :)
Many TIA,
Jon- Hide quoted text -
- Show quoted text -
Jason and Storrboy... Thank you, this is exactly what I needed.
Searching for these terms (treeview, listview, netsted sets, and
adjacency model) gets me copious examples of code and theory for how
to set things up. many thanks. Jon This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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