How Can I Map JPA Entity Fields with Reserved Keywords?

Mapping Entity Fields with Reserved Keywords in JPA

The inability to directly map entity fields whose names are reserved keywords in JPA can present roadblocks for application development, particularly when working with dialects that strictly enforce syntax rules. However, there is a straightforward solution available in Hibernate as a JPA provider.

Using Identifier Escape with Backticks

To escape reserved keywords, enclose them within backticks in the @Column annotation. This feature is inherited from Hibernate Core and supports the correct quotation style based on the SQL dialect. For SQL Server, this translates to using brackets for quoting.

In Hibernate as JPA 1.0 provider:

@Column(name="`open`")

In JPA 2.0:

@Column(name="\"open\"")

By utilizing this approach, Hibernate ensures that the reserved keyword is properly quoted during table creation, preventing issues like the one encountered with the 'open' field.

Additional Resources

• [Hibernate reference guide](https://docs.jboss.org/hibernate/orm/6.0/userguide/html_single/)
• [5.4. SQL quoted identifiers](https://docs.jboss.org/hibernate/orm/6.0/userguide/html/identifiers.html#naming-sql-quoted-identifiers)
• [JPA 2.0 specification](https://jcp.org/en/jsr/detail?id=338)
• [2.13 Naming of Database Objects](https://docs.oracle.com/javaee/7/api/javax/persistence/metamodel/Attribute.html#getName--)

Related Questions

• [Hibernate, MySQL and table named “Repeat” - strange behaviour](https://stackoverflow.com/questions/56279222/hibernate-mysql-and-table-named-repeat-strange-behaviour)
• [Automatic reserved word escaping for Hibernate tables and columns](https://stackoverflow.com/questions/24237940/automatic-reserved-word-escaping-for-hibernate-tables-and-columns)

The above is the detailed content of How Can I Map JPA Entity Fields with Reserved Keywords?. For more information, please follow other related articles on the PHP Chinese website!