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Dropping Tables

Dropping Tables

Another useful command to use is DROP. Let’s say you want to simply delete all entries in a table and recreate it. A handy way to do this is to drop the table and then re-export the schema. Again, from Figure 1, select the DROP command from the Command menu. Enter the name of the table you want to delete—in this case, the table is USERS—and then execute the SQL.

After dropping the table, you have to run the ant schemaexport target.

A General Note About Object Relational Mapping

When you map Java classes into database entities, you are using the power of object relational mapping. In effect, you’re bridging the Java and database domains. This has many benefits:

  • Less need for database expertise
  • A common language for the Java and database worlds
  • Removing much of the drudgery of database use

The first point is perhaps arguable! The best way to produce an awful mess is to have partial knowledge of an area such as database development. However, the nice thing about ORM and Hibernate in particular is that if you have knowledge of the key principles, you shouldn’t go far wrong.

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