Dia er diagram tool install#

We'll create a custom typemap and define the specific SQL for each target db. But we also want to support both MySQLДЄnd Apache Derby without having to maintain separate SQL files. Lets suppose we'd like to have a primary key column which This is a feature specific to MySQL and not supported Typemaps are used for when you'd like to configureД¬ustom types which are specific to a database platform. Here's what our diagram should look like now: Now in theД¬omponent object box enter in the values you'd like to insert, one per line. So in this case, for the вЂњStereotype: ' field we'd enter in вЂњdepartment Insert into department ( department_id, name ) values ( 1, ' Marketing ' ) insert into department ( department_id, name ) values ( 2, ' Production ' ) insert into department ( department_id, name ) values ( 3, ' Design ' ) For this example, to insert a default list ofДepartments we'd normally write the following SQL: In the вЂњStereotype: ' field you basically enter in the first part of an вЂњinsert Select the вЂњComponentвЂќ object and add it to your diagram editor window. To do this we'll use the вЂњComponentвЂќ object from the UML sheet. Now suppose we have a default list ofДepartments that we'd like to load into the department table when our database This is a simple example of a database which stores employee data along with That it's visibility is вЂњProtectedвЂќ thus making it a Primary Key): Shown in the screenshot below (note the вЂ#вЂ™ in front of an attribute indicates This example, create two tables вЂњemployeeвЂќ and вЂњdepartmentвЂќ with the columns as Next, repeat the process for as many tables as you need in your database. The screen shot below is an example of the Class property editor window. Not null will automatically get added to all primary keys on output generation. вЂњnot nullвЂќ here and instead select вЂњProtectedвЂќ for the вЂњVisibility: ' field. If the column your adding is a primary key then don't put For example, this is where you couldДЄdd in вЂњnot nullвЂќ. In the вЂњValue: ' fieldД®nter any default values for the column. To support multiple database platforms try to be generic here and only use ANSI In the вЂњType: ' field enter in the SQL type for the column. In the вЂњName: ' field enter in the column Next click on the вЂњAttributesвЂќ tab and enter in theД¬olumns of the table as attributes. We're only going to customize a few properties outlinedДЇirst, under the вЂњClassвЂќ tab enter the name of the table (employee) in the This will bring up a rather large and complex property window for the UML class Now right click on the new class and select вЂњShow PropertiesвЂќ. Sheet and click inside the diagram editor window. Select the вЂњClassвЂќ object icon from the UML Typemaps are used for adding custom SQL types such as MySQL tinyint. These are equivalent to hard coding вЂњinsert into. More on classes later.Д¬omponent is a special object that lets you define a list of default values to be inserted into a table. Attributes in classes can have visibility (public, private, protected). A Class has a name which corresponds to the name of the table and attributes which map to the columns of the table. The main UML objects and their usage: UML objectД¬lass represents a table in the database. Tables and definitions that make up our database. We'll be using various UML objects to represent

Dia er diagram tool install#

The install in this post but there should be packages available for most LinuxДistro's and if your not running Linux now is a great time to start!ДЇire up Dia, create a new diagram and save it as вЂњemployee.diaвЂќ. What'sДЄlso nice about creating database schemas this way is that you can generate SQLДЇor multiple target databases without the maintenance overhead.ДЇirst off, install a copy of Dia as well as tedia2sql. Will transform our Dia files directly to SQL for our target database. To use a perl script called tedia2sql which This exercise we'll be creating UML diagrams from within Dia. So before you create your nextДatabase read on and see how Dia can make your life a bit easier.Дia is a program for creating diagrams and for Platforms each with their own SQL syntax. It's tedious having to manage the various SQL for building the databaseДЄnd this can be a larger pain when trying to support different database As soon as you add a new column or change theДesign around you end up having to sync your visual diagram with your SQLДЇiles. Having a nice visual representation of a database to be quite helpful but can't In this post I'm going to give a quick how-to on creating database schemas withДЄ wonderful tool called Dia.