How to Handle Reserved Keywords in JPA Entity Field Mapping?

Mapping Entity Fields with Reserved Keywords in JPA

When mapping entity fields whose names are reserved words in JPA, such as "open" in SQL Server, challenges may arise. Hibernate typically uses quoted identifiers when creating tables, ensuring that reserved keywords do not interfere with SQL queries. However, this may not always occur, leading to errors like the one encountered in the example.

Escaping Reserved Keywords with Backticks (JPA 1.0)

In JPA 1.0, the issue can be resolved by using backticks around the reserved keyword in the @Column annotation:

@Column(name="`open`")

Hibernate will then enclose the identifier in appropriate quotation marks based on the SQL dialect.

Using Double Quotes (JPA 2.0)

In JPA 2.0, the syntax for escaping reserved keywords has been standardized, using double quotes:

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

This approach will automatically add the necessary quotation marks to the SQL queries.

Reference Documentation

• [Hibernate Reference Guide](https://docs.jboss.org/hibernate/stable/)
• [SQL Quoted Identifiers in Hibernate Core](https://docs.jboss.org/hibernate/orm/5.6/userguide/html_single/Hibernate_User_Guide.html#identifiers-delimit-identifiers)
• [JPA 2.0 Specification](https://docs.oracle.com/javaee/7/api/javax/persistence/package-summary.html)
• [Naming of Database Objects in JPA 2.0](https://docs.oracle.com/javaee/7/api/javax/persistence/Table.html#name--))

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