Most databases do not have the actual journal articles housed on them, some databases, like Academic Search Complete will have some of them. Instead, they usually just contain information about the article. Some databases will allow you to search full-text only, but beware that you are not searching all the articles that we subscribe to.
If you don't find an item as full-text in the database you're searching, use the "Find It" button to cross-search other databses for that same item. You may discover that we have electronic access to that material after all.