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DB Importer is an Eclipse plug-in that generates JPA classes for an existing database. It is free for non-commercial use.

Version 2.0 has a new user interface and adds possibility to configure the generated code in the DB Importer editor.

A script can be used to configure many values at once or for more advanced configurations. For instance:

• Filter which tables to import.
• Determine whether to generate relations for foreign keys.
• Control generation of many-to-many relations from join tables.
• Configure class and variable names. For instance, a table name like "tb_person_account" can be converted to a class name "PersonAccount".
• Generate annotations such as @GeneratedId, @Version, etc.
• Check database design rules.

Here are some examples of code that can be generated:

Generate @Version annotation on all fields with name "version"

@Version
private long version;

Generate @GeneratedValue(strategy=GenerationType.AUTO) on all PK fields

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long id;

Convert all tinyint SQL columns to Boolean or boolean Java types

private boolean b;

Let some classes implement a certain interface

@Entity
class Person implements PersistentObject

Generate both relation and attribute for a field

This can be useful with frameworks such as SmartGWT, which don't handle JPA relations very well.

@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="person_id", nullable=false,
   insertable=false, updatable=false)
private Person person;

@Column(name="person_id")
private long personId;

Generate ordered lists for some collections

@OneToMany(mappedBy="messageList", fetch=FetchType.LAZY)
@OrderBy(value="sortOrder")
private List messages = new ArrayList();

Generate enum types instead of int for some fields

@Column(name="status", length=10)
private Status status;

Generate metadata

public interface PersonMetadata {
  String ID = "id";
  String NAME = "name";
}

Import unique constraints

@Entity
@Table(name="messages", uniqueConstraints={
   @UniqueConstraint(columnNames={"unique_code"})
} )

See our home page for how to do this in practice.