12.2. Foreign Table

A FOREIGN table is a table that is defined on a physical model that represents a real relational table in source databases like Oracle, SQLServer etc. For relational databases, JBoss Data Virtualization has the capability to automatically retrieve the database schema information upon the deployment of the VDB, if one like to auto import the existing schema. However, the user can use below FOREIGN table semantics, when they would like to explicitly define tables on PHYSICAL models or represent non-relational data as relational data in custom translators.

CREATE FOREIGN TABLE Customer (id integer PRIMARY KEY, firstname varchar(25), lastname varchar(25),  dob timestamp);

CREATE FOREIGN TABLE Order (id integer PRIMARY KEY, customerid integer, saledate date, amount decimal(25,4), CONSTRAINT fk FOREGIN KEY(customerid) REFERENCES Customer(id));