Data Modeler : Generate direct to a schema / Reverse engineering

Hi everybody,
I searched for informations in the help but I didn't found any interesting information.
I would like to know :
- If it's possible to generate the relation model directly to a schema? If yes, where can I found documentation?
- Is it possible to create some scripts with reverse engineering (as Designer)?
Thanks in advance!

Hi Cedric,
If it's possible to generate the relation model directly to a schema?no
Is it possible to create some scripts with reverse engineeringYou can generate DDL script for objects in relational and physical model - press "Generate DDL" icon when you are in relational model or use "File>Export>DDL File".
You also can generate "alter statements" when you compare relational model to database, DDL files or another design.
You can look at available demonstrations http://www.oracle.com/technetwork/developer-tools/datamodeler/overview/index.html
Philip

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Hi,
Simple question. Is it possible to generate database documentation, based on data table field notes, that we write in DATA MODELER? THX

Hi Marcus,
there is no build-in reports in current release that can be used to generate such documentation.
You can use export "to reporting schema" in order to get meta data in Oracle database and can build own reports.
There will be reports coming with next release.
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A couple of things you could try:
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Hi,
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When I export my model to DDL PK and Unique constraint are exported correctly, but Data Modeler generate only indexes on FK and don't generate FK constraints itself.
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Basically, I want only those table which are having relationship with other tables here. The reason being, if I select all tables in the schema then I would get those tables in the ER diagram which don't have any relationship with other tables.
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Can rational rose reverse enginner data model from database (i.e. read the schema in db and then generate the ER diagram)?

Yes you can reverse engineer datamodel from database. Following steps will help you in doing it. I did it using Rational Rose 2001(a) Enterprise suite edition.
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2. Reverse engineering wizard dialog box will be shown.
3. Select Reverse engineer from Database
4. Select your target database. Enter username/password and service name
for your database.
5. Test connection option is also provided. You can test the connection using this option.
6. Available schemas in the selected database will be displayed.
7. Select the schema of your choice and it will generate the datamodel.
Hope it helped you.

Unable to generate Logical Model Diagrams through Reverse Engineering

Hi,
I am currently using SQL Developer Data Modeler Version-3.0.04.
I have generated Logical Model Diagrams from Relational Model Diagrams through Reverse Engineering (Done by pressing an" engineer to Logical Model button" on top panel of sql developer) .I saved the DMD file (source file) once i had done generating the logical diagrams.Now if i reopen the DMD and open the logical diagram again I found that most of the tables had lost their relationships.So i tried to regenerate the Logical Model Diagram again from the same Relational Diagram but it is not being generated unless i create a new Relational Diagram.Is there a way to generate multiple Logical Diagrams for the same Relational Diagram rather than creating a new one for each Logical Diagram to be created.
Regards .
Thanks in advance.

Any comments on this issue?. Please let us know.

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Without this facility, this tool is useless, IMO.
I want:
i). sequences to become the physical PKs by default, and that what were the logical PKs in the logical model, to become a unique key in the physical model.
ii). I want this set by default when generating the physical model....
iii). ....with an option to turn this off on a entity-by-entity basis (as not all tables will necessarily require such a surrogate PK; so the logical PK may remain the physical PK).

It is common practice that physical PKs in Oracle tables are defined from sequences (surrogate PKs), and that the logical PK from the entity becomes a unique key in the table.
This may not always be the case in every application out there, and some people may disagree, but it is nonetheless a needed feature.
My new Feature Request is therefore:
I would like to see the following additions to the product.
1. In the Preferences -> Data Modeler -> Model -> Logical, a flag that by default indicates whether the designer wishes to opt to enable this feature (ie; have all logical PKs converted to unique keys, and replaced by sequence nos. in the physical model). This flags needs to be there since in real life, albeit erroneously IMO, some people will choose not to opt to use this functionality.
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3. When Forward Engineering to the physical model from the logical, the following should happen.
ENTITY 1 ---------->TABLE 1
---------------------> P * Surrogate PK
* Attribute 1 -----> U * Column 1
* Attribute 2 -----> U * Column 2
o Attribute 3 ----------> Column 3
Here you can see,
- Attributes 1 & 2 (the logical PK) of the entity become a unique key in the table (columns 1 & 2),
- optional Attribute 3 becomes NULLable column 3,
- and a physical surrogate PK column is added (type unbounded INTEGER, PRIMARY KEY constraint added).
From entity DEPT as: (Examples based on SCOTT schema)
DEPTNO NUMBER(2) NOT NULL <-- Logical primary key on entity
DNAME VARCHAR2(14)
LOC VARCHAR2(13)
CREATE TABLE DEPT
(PK_DEPT INTEGER, -- New column becomes surrogate physical PK, driven from sequence defined later
DEPTNO NUMBER(2) NOT NULL, -- Former logical PK becomes a UK
DNAME VARCHAR2(14),
LOC VARCHAR2(13))
ALTER TABLE DEPT
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ALTER TABLE DEPT
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CREATE SEQUENCE PK_DEPT_SEQ
CREATE TRIGGER PK_DEPT_SEQ_TRG
BEFORE INSERT ON DEPT
FOR EACH ROW
WHEN (new.PK_DEPT IS NULL)
BEGIN
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FROM DUAL;
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EMPNO NUMBER(4) NOT NULL -- Logical primary key on entity
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SAL NUMBER(7,2)
COMM NUMBER(7,2)
DEPTNO NUMBER(2)
CREATE TABLE EMP
(PK_EMP INTEGER, -- New column becomes surrogate physical PK, driven from sequence defined later
FK_DEPT INTEGER, -- New FK to surrogate PK in DEPT table (maybe NOT NULL depending on relationship with parent)
EMPNO NUMBER(4) NOT NULL, -- Former logical PK becomes a UK
ENAME VARCHAR2(10),
JOB VARCHAR2(9),
MGR NUMBER(4),
HIREDATE DATE,
SAL NUMBER(7,2),
COMM NUMBER(7,2),
DEPTNO NUMBER(2))
ALTER TABLE EMP
ADD CONSTRAINT PK_EMP PRIMARY KEY (PK_EMP) USING INDEX PCTFREE 0
ALTER TABLE EMP
ADD CONSTRAINT FK_DEPT FOREIGN KEY (FK_DEPT) REFERENCES DEPT (PK_DEPT)
ALTER TABLE EMP
ADD CONSTRAINT UKLPK_EMPNO UNIQUE (EMPNO) USING INDEX PCTFREE 0 -- Former logical PK becomes a UK (constraint name reflects this)
CREATE SEQUENCE PK_EMP_SEQ
CREATE TRIGGER PK_EMP_SEQ_TRG
BEFORE INSERT ON EMP
FOR EACH ROW
WHEN (new.PK_EMP IS NULL)
BEGIN
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INTO :new.PK_EMP
FROM DUAL;
-- Or from 11g onwards, simply,
:new.PK_EMP := PK_EMP_SEQ.NEXTVAL;
END;
[NOTE: I use PCTFREE 0 to define the index attributes for the primary & unique keys since the assumption is that they will in general not get updated, thereby allowing for the denser packing of entries in the indexes and the (albeit minor) advantages that go with it.
This is certainly always true of a sequence-driven primary key (as it is by its very nature immutable), but if the unique key is likely to be frequently updated, then this PCTFREE option could be user-configurable on a per table basis (perhaps under Table Properties -> unique Constraints).
For non-sequence-driven primary keys, this storage option could also appear under Table Properties -> Primary Key.
I notice no storage options exist in general for objects, so you may like to consider adding this functionality overall].
Associated Issues :
- Preferences, 'Naming Standard: Templates' should be updated to allow for the unique key/constraint to be called something different, thus highlighting that it comes from the logical PK. I've used 'UKLPK' in this example.
- Mark the physical PK as being generated from a sequence; perhaps a flag under Table Properties -> Primary Key.
- When Forward Engineering, if an entity exists without a logical PK, the forward engineering process should halt with a fatal error.
!!! MODERATOR PLEASE DELETE ME !!!

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Hi,
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I'm following these steps:
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Do you still have enough disk space available on your file system to store the different xml-facts the RuleAuthor will create for you?

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Thank you, Philip, for your answer!
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http://st-curriculum.oracle.com/obe/fmw/bi/bip/bip11g/gettingstarted/gettingstarted.htm

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Edited by: 854675 on Oct 7, 2012 11:02 PM

I have know how to create FXML file that describes a table. Meanwhile, according to [Oracle Tutorial|http://docs.oracle.com/javafx/2/fxml_get_started/fxml_tutorial_intermediate.htm#CACFEHBI], it is a best practice to implement a class that defines the data model and provides methods and fields to further work with the table.
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Edited by: 854675 on Oct 7, 2012 11:02 PM

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Much lighter.
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Data Modeler : Generate direct to a schema / Reverse engineering

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