Adding extra fields in hibernate beans that are not fields in db table

Question

Is it possible to add extra member variables in hibernate beans that are not fields in the actual database?

eg. I need to add hasComments a member variable in MyEntity, and has comments is not an actual field in the db.

possible duplicate of how to make hibernate ignore class variables that are not mapped! — earthmover
– earthmover, Commented Jan 29, 2014 at 5:44

Aleksander Blomskøld · Accepted Answer · 2012-10-15 12:10:18Z

4

Let either the field be transient, or annotate it with the @Transient annotation.

answered Oct 15, 2012 at 12:10

Aleksander Blomskøld

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2 Comments

Komal Goyal Over a year ago

I tried adding Transient annotation but while I try to read a record from db it gives the following exception org.hibernate.exception.SQLGrammarException: could not load an entity: [com.en.server.domain.Myentity#1] Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'myentity0_.hasComments' in 'field list'.. What could be the issue?

Aleksander Blomskøld Over a year ago

Could you paste your class in your question?

Vinit Prajapati · Accepted Answer · 2012-10-15 12:34:56Z

1

See this

@NotNull
@Column(name = "comment")
private String comment;

@Column(name = "time")
@Temporal(TemporalType.TIMESTAMP)
@DateTimeFormat(style = "M-")
private Date time;

@Transient private String information;

answered Oct 15, 2012 at 12:34

Vinit Prajapati

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Comments

CodeMed · Accepted Answer · 2014-10-30 21:15:48Z

0

For a quick hack to move past this error during development, you can use hbm2ddl to create the database automatically from the hibernate mappings, and it will create fields in the table for the transient properties. This does not solve the long term problem, but it lets you continue to work on other things until you have time to resolve the underlying issue.

answered Oct 30, 2014 at 21:15

CodeMed

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