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POWhy does Hibernate insert a parent row with a foreign key without inserting the child row?
 

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  1. POWhy does Hibernate insert a parent row with a foreign key without inserting the child row?
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    <p>I'm hoping someone has run into this problem before and can help me out. Basically, Hibernate is inserting a parent row (with an ID pointing to a child row), but not inserting that child row with the associated ID, which leaves the database in a bad state. Here's an example of the exception that's thrown when Hibernate tries to load the improperly saved object:</p> <pre><code>27 Jun 2011 13:55:31,380 ERROR [scheduler_Worker-4] - Job DEFAULT.queryScrubJobDetail threw an unhandled Exception: org.springframework.scheduling.quartz.JobMethodInvocationFailedException: Invocation of method 'doIt' on target class [XXX] failed; nested exception is org.springframework.orm.hibernate3.HibernateObjectRetrievalFailureException: No row with the given identifier exists: [XXX.DataProviderTransaction#60739703]; nested exception is org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.idology.persist.DataProviderTransaction#2] </code></pre> <p>This part of the application has three entities:</p> <ul> <li><strong>Query</strong>, which is a parent of DataProviderTransactionReference and DataProviderTransaction</li> <li><strong>DataProviderTransaction</strong>, which is a child of Query and a parent of DataProviderTransactionReference</li> <li><strong>DataProviderTransactionReference</strong>, which has foreign keys pointing to DataProviderTransaction and Query</li> </ul> <p>Here are the mappings:</p> <p>From <strong>Query</strong>:</p> <pre><code>@OneToMany(mappedBy = "query", cascade = { CascadeType.PERSIST, CascadeType.MERGE }, fetch = FetchType.LAZY) @Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE) @JoinColumn(name = "query_id") public List&lt;DataProviderTransactionReference&gt; getDataProviderTransactionReferences() </code></pre> <p>From <strong>DataProviderTransaction</strong>:</p> <pre><code>@ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "query_id") public Query getQuery() </code></pre> <p>From <strong>DataProviderTransactionReference</strong>:</p> <pre><code>@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, fetch = FetchType.EAGER) @JoinColumn(name = "data_provider_transaction_id") @Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE) public DataProviderTransaction getDataProviderTransaction() { return mDataProviderTransaction; } </code></pre> <p>The schema looks like this (leaving out the queries table since it has no foreign keys):</p> <pre><code>data_provider_transaction +------------------+---------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------+---------------+------+-----+---------+----------------+ | id | bigint(20) | NO | PRI | NULL | auto_increment | | query_id | bigint(20) | YES | MUL | NULL | | +------------------+---------------+------+-----+---------+----------------+ data_provider_txn_refs +------------------------------+------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------------------+------------+------+-----+---------+----------------+ | id | bigint(20) | NO | PRI | NULL | auto_increment | | created_at | datetime | YES | | NULL | | | data_provider_transaction_id | bigint(20) | YES | MUL | NULL | | | query_id | bigint(20) | YES | MUL | NULL | | +------------------------------+------------+------+-----+---------+----------------+ </code></pre> <p>So once we're done running a query (represented by the Query object), we save it using Spring and Hibernate using the following:</p> <pre><code>getHibernateTemplate().saveOrUpdate(aQuery); </code></pre> <p>The Query is saved along with the associated DataProviderTransaction and DataProviderTransactionReference entities. Except that sometimes it saves a Query and a DataProviderTransactionReference without the associated DataProviderTransaction. It does put an ID in the data_provider_transaction_id but it points to a row that does not exist in the data_provider_transaction table.</p> <p>The next step is to add a foreign key constraint to cause the problem to occur when we do the initial save rather than when we try to load the object later.</p> <p>We're using Spring 2.5.6, Hibernate 3.3.2, and MySQL 5.0. I've seen the problem occur over the years with earlier versions of Spring and Hibernate, though.</p> <p>Anyone ever seen/solved this problem?</p>
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    1. USRafe
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    1. COIt's a bit hard to undestand your question, and you didn't join the relevant source code with the mapping between entities. But what seems wrong to me is that you have join columns without foreign keys in the database. If the database enforced the foreign key, you would at least have exceptions rather than incoherent data.
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    2. COwould also need to understand how you are adding the objects to the database - do you call `save()`, `update()`, on one or both of the objects, are you populating both sides of a bi-directional relationship in your classes, etc?
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      1. USmatt b
    3. COWhat is the generation strategy for your primary keys? Is it identity? See my answer below.
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      1. USMatthew Farwell
 

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