hi i need to see entity–relationship model (ERD) in liferay 7 , how can find or design it? please help mei find this pdf file but it's to old (2006!)thank for read this thread and help me 
Wow, I think Olaf was channeling me on that response! 
Liferay does some funky stuff in its tables, so much so that a common ERD is just not possible. A bunch of tables have a "class name id/class pk" pair of columns indicating that they can have a relation to any other table.
There are no foreign key relationships in the data, relationships are maintained by the code, so there's nothing there for a typical ERD to build from.
Since everything is maintained in the code, the next release of Liferay could change how relationships are managed so your understanding of an ERD can change w/o you knowing about it.
Long story short, the database is not a good source of understanding or learning about Liferay, whereas the documentation, the Liferay source, Liferay University, etc. are better sources. Trying to figure out an ERD is just going to waste your time trying to understand something that really won't help in the long run. Instead, invest your time in reading the doco or the source or ... You'll be much better off in the long run.
Liferay does some funky stuff in its tables, so much so that a common ERD is just not possible. A bunch of tables have a "class name id/class pk" pair of columns indicating that they can have a relation to any other table.
There are no foreign key relationships in the data, relationships are maintained by the code, so there's nothing there for a typical ERD to build from.
Since everything is maintained in the code, the next release of Liferay could change how relationships are managed so your understanding of an ERD can change w/o you knowing about it.
Long story short, the database is not a good source of understanding or learning about Liferay, whereas the documentation, the Liferay source, Liferay University, etc. are better sources. Trying to figure out an ERD is just going to waste your time trying to understand something that really won't help in the long run. Instead, invest your time in reading the doco or the source or ... You'll be much better off in the long run.
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