I'm not really sure if ERD is the proper term, but occasionally I see diagrams created where the line in between two entities is labeled with text to describe the relationship.
For example if I had User, Item, ItemRating, I may want to describe the line between User and ItemRating as "rates" and the line between Item and ItemRating as "is rated by".
I found I can make a text object in mysql workbench, and place it where I want, but I can't find a way to attach it to a line so that it moves with the line if I rearrange things.
using mysql workbench 5.2.3
Had the same question before exploring the menu
On MySqlWorkbench, while EER diagram Is open :
Menu> Model > model Options > Diagram
untick 'use defaults' and untick 'hide captions'
You Can now See the relation caption, but it Can get Messy if You write a 2nd capt.
I wanted to do the same thing but haven't found a way. I don't think it can be done in Workbench. I'm using 5.2.34.
Check this it may answer your query.
http://dev.mysql.com/doc/workbench/en/wb-using-text-object-tool.html
Related
So I've just worked through the tutorial and I'm unclear about a few things. The main one, however, is how do you decide when something is a relationship and when it should be a Node?
For example, in the Movies Database,there is a relationship showing who acted in which film. A property of that relationship is the Role. BUT, what if it's a series of films? The role may well be constant between films (say, Jack Ryan in The Hunt for Red October, Patriot Games etc.)
We may also want to have some kind of Character bio, which would obviously remain constant between movies. Worse, the actor may change from one movie to another (Alec Baldwin then Harrison Ford.) There are many others like this (James Bond, for example).
Even if the actor doesn't change (Main roles in Harry Potter) the character is constant. So, at what point would the Role become a node in its own right? When it does, can I have a 3-way relationship (Actor-Role-Movie)? Say I start of with it being a relationship and then, down the line, decide it should've been a node, is there a simple way to go through the database and convert it?
No there is no way to convert your datamodel. When you start your own Database first take time to find a fitting schema. There is no ideal way to create a schema and also there are many different models fitting to the same situation without being totally wrong.
My strategy is to put less information to the relationship itself. I only add properties that directly concern the relationship and store all the other data in the nodes. Also think of properties you could use for traversing the graph. For example you might need some flags or even different labels for relationships even they more or less are the same. The apoc.algo.aStar is only including relationshiptypes you want (you could exclude certain nodes by giving them a special relationshiptype). So keep that in mind that you take a look at procedures that you might use later.
Try to create the schema as simple as possible and find a way to stay consistent in terms of what things are nodes and what deserves a relationship. Dont mix it up.
Choose a design that makes sense for you! (device 1)-[cable]-(device 2) vs (device 1)-[has cable]-(cable)-[has cable]-(device 2) in this case I'd prefer the first because [has cable] wouldn't bring anymore information. Irrespective to what I wrote above I would have a lot of information in this [cable] relationship but it totally makes sense for me because I wouldnt want to search in a device node for cable information.
For your example giving the role a own node is also valid way. For example if you want to espacially query which actors had the same role in common I'll totally go for giving the role a extra node.
Summary:
Think of what you want to do with the data and choose the easiest model.
My client has decided they want to rename a very commonly used data item name.
So, for example, the database has a column called 'Cost' and they see 'Cost' on a heap of reports.
The client now wants to see 'Net Cost' everywhere.
So we need to change every occurrence of 'Cost' and change it to 'Net Cost'
I can do this in Framework Manager easily enough, and I can even run Tools > Report Dependency to find all the reports that use the 'Cost' column. But if there's 4,000 of them, that's a lot of work to update them all.
One idea is to deploy the entire content store to a Cognos Deployment zip file, extract that & do a global search & replace on the XML. But that's going to be messy & dangerous.
Option 2 is to use MotioPI to do a search & replace. I don't think the client will spring for buying this product just for this task.
Are there other options?
has anyone written anything in the Cognos SDK which will do a rename?
has someone investigated the Content Store database to the degree
that they could do a rename on all the report specs in SQL?
are there other options I've overlooked?
Any ideas would be greatly welcomed ...
Your first option is the way to go. This essentially boils down to an XML find-and-replace scenario. You'll need to isolate just the instances of the word "Cost" which are relevant to you. This may involve the start and end tags.
To change the data source reference across reports, you'll need to find and replace on the three part name [Presentation Layer].[Namespace].[Cost]. If there are filters on the item, they may just reference the one part name from the Query. Likewise, any derived queries would reference the two part name. Handle these by looking through the XML report spec and figuring out how to isolate the text.
I'm assuming your column names are set to inherit the business name from the model and not hard coded (Source Type should be Data Item Label, NOT Text). If not, you'll need to handle these as well. Looking at the XML, you would see <staticValue>Cost</staticValue> for these.
It's not really dangerous as you have a backup. Just take multiple passes, each with as granular a find and replace as possible.
Motio will just look at the values inside the tags, so you will be unable to isolate Cost, thus it can't be used for this. However, it would come in handy for mass validation of reports after the find and replace. A one seat license for the year could be justified by the amount of development time it could save here.
Have you tried using DRU? (http://www-01.ibm.com/support/docview.wss?uid=swg24021248)
I have used this tool before to do what you are describing.
Good luck.
You can at least search for text in the Content Store (v10.2.1) using something like:
set define off
select distinct T4.name as folder_name, T2.name as report_name
from cmobjprops7 T1
inner join cmobjnames T2 on T1.cmid=T2.cmid
inner join cmobjects T3 on T1.cmid=T3.cmid
inner join cmobjnames T4 on T3.pcmid=T4.cmid
inner join ( -- only want the latest version (this still shows reports that have been deleted)
Select T4.name as folder_name, T2.name as report_name, max(T3.modified) as latest_version_date
from cmobjnames T2
inner join cmobjects T3 on T2.cmid=T3.cmid
inner join cmobjnames T4 on T3.pcmid=T4.cmid
Where T2.Name like ‘%myReport%’ -- search only reports with 'myReport' i the name
and substr(T4.name,1,1) in ('Project Zeus','Project Jupiter') -- search only folders with this in the name
Group by T4.name, T2.name
) TL on TL.folder_name=T4.name and TL.report_name=T2.name and TL.latest_version_date=T3.modified
where T1.spec like '%[namespace].[column_name]%' -- text you want to find
and substr(T4.name,1,2) in ('Project Zeus','Project Jupiter')
order by 1 desc, 2;
I've generated a Neo4j graph and created visualization of the graph using the 'Style' rules on 'Data Browser'. I was able to display the properties of the Nodes. It looks like the style rules can only be applied to Nodes. However I want to display (visualize on data browser) the properties on the relationship. Is this possible? If so, how do I do it?
I read through the Neo4j documentation and also searched in the Neo4j forums but had no luck.
I appreciate any help.
TIA
For example:
(is a)
(Josh) --------------------> (Male)
(demographic=gender)
(created=09/25/12)
Where demographic, created are properties of the relationship 'is a'.
Well, since you extended the question to available options, not just Webadmin:
The Neo folks put up a side about visualization options: http://www.neo4j.org/develop/visualize
For your use case, try Neoclipse https://github.com/neo4j/neoclipse/downloads
it allows to specify which properties to display on nodes and relationship (be sure to enable the filters in the Graph Database View or the preferences won't have any effect). It look similar to the webadmin, but can be customized more.
I'm very interested in building a data visualisation component and can
see how it could be done but would prefer not to reinvent something
which already exists. If this truly is a 'first' then I'm prepared to put my initial code
on Github for others to share [and hopefully improve !!]
Essentially I'd like to be able to do the following:
1) Access a table or tables within a database and create nodes based
on entries within them. Add nodes on create, remove them on delete.
2) Use the foreign keys and/or join tables [for many-many links] to
create edges. Add edge(s) when node created, remove edges when node
deleted, check and add/remove edges when node updated.
3) Pass the nodes and edges to Gephi for display
I can see how to do steps 1 and 2 quickly and easily -- what I haven't
been able to find (after much searching) is how to do step 3.
Has anyone had any success in doing this? -- any example code that they're willing to share ?
Thanks
We tried something similar once, but it may not help you that much. We wrote a Rake task that got data out our DB, which we then fed into Gephi manually. That wasn't really satisfactory and in the end I went with Rake task -> CSV -> R script for visualization (basically connections of users on a world map). If you are not dead set on using Gephi I could show you some of the R code :-)
I am using a TVirtualStringTree (part of the Virtual TreeView Component) in my Delphi project and I would like to create a view where 2 columns can have children that are expandable/collapsable with [+] sign.
In the picture below as sample I would like to have a [+] sign in the Server Column but also in the Image column. The idea is that the tree has several Server nodes that each have many process child's (which main colum is image) and some processes have sub-processes which are children of the processes'node.
(source: remkoweijnen.nl)
Is such a layout possible? If not with the default component I would appreciate advice on how to implement this in a descendant.
/Edit: The following screenshots are when using the method TOndrej suggests:
alt text http://www.remkoweijnen.nl/temp/TreeView2.png
alt text http://www.remkoweijnen.nl/temp/TreeView3.png
alt text http://www.remkoweijnen.nl/temp/TreeView4.png
OK, I decided to implement as per TOndrej's idea:
alt text http://www.remkoweijnen.nl/temp/TreeView5.png
You most probably don't need that. Just make yourself a clear specification of what grouping you need. The first column can be multi-purpose - showing different information on each grouping level - e.g. level 0: server, level 1: process, level 2 and higher: child process.
On each level, only columns relevant to that level need to display any information. In the above example, level 0 would only display the server name in the first column; the rest of the columns would remain empty.
You could probably implement as many plus signs as you want by custom-drawing but it would be a lot of work and I really think the result is unnecessary, unusual and easily confusing to the user.
Only one column can have the tree, the other columns act a a listview. The column with the tree is the main column.
I would not know how your grouping would work if two columns had a tree and they might "conflict". What is parent node etc etc. GUI technically this might not be the best way of giving those details; a user won't expect it to work that way.