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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12125" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-452f4868-8df5-4bef-90fb-2b45d413430e" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12125" style="color: #3b73af; text-decoration: none">HHH-12125</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-12125" style="color: #3b73af; text-decoration: none">Support @GeneratedValue without explicit generator definition</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Change By:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="steve" id="email_steve" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ebersole</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">For example</span> <span class="diffaddedchars" style="background-color:#ddfade;">Historically Hibernate always expects that {{@GeneratedValue}} is matched with a matching named "generator definition". The name is provided by {{GeneratedValue#generator}}. The corresponding "generator definition" would be a {{@GenericGenerator}}</span> <span class="diffcontext">,</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> historically</span> <span class="diffaddedchars" style="background-color:#ddfade;"> {{@SequenceGenerator}} or {{@TableGenerator}} based on the value of {{GeneratedValue#strategy}}:<br><br>h3. {{SEQUENCE}} and {{TABLE}}<br><br>Given {{@GeneratedValue( strategy=SEQUENCE, ... )}} Hibernate would look for a matching {{@GenericGenerator}} or a {{@SequenceGenerator}}.<br>Given {{@GeneratedValue( strategy=TABLE, ... )}} Hibernate would look for a matching {{@GenericGenerator}} or a {{@TableGenerator}}.<br><br>Again, it would be an error if Hibernate did not find the matching {{@GenericGenerator}}, {{@SequenceGenerator}} or {{@TableGenerator}}. Ultimately though, these generator definitions are really just about handling non-default situations (e.g., use a specific increment size for a sequence/table, etc). But it should be ok for the user to leave them off and just get the "default behavior" (e.g. increment size of 50 as JPA defines for {{@SequenceGenerator}} and {{@TableGenerator}}).<br><br>*_NOTE: I will talk about SEQUENCE here, but the same holds true for TABLE_*<br><br>In other words, this should be a valid mapping:<br><br>{code}<br> @Id<br> @GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "my_db_sequence" )<br> public Integer id;<br>{code}<br><br>Here</span> <span class="diffcontext"> we would</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> interpret</span> <span class="diffaddedchars" style="background-color:#ddfade;"> pick up the JPA defined defaults (see {{@SequenceGenerator}} and {{@TableGenerator}} for the defined defaults). <br><br>The name is an additional discussion, and is the same discussion for</span> <span class="diffcontext">:<br><br>{code}<br> @Id<br> @GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "my_db_sequence" )<br> @SequenceGenerator( name = "my_db_sequence", initialValue = 100, allocationSize = 500 )<br></span> <span class="diffaddedchars" style="background-color:#ddfade;"> public Integer id;<br></span> <span class="diffcontext">{code}<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">In both cases we do not provide an explicit {{@SequenceGenerator#sequenceName}} value. Historically Hibernate interprets the default name for both sequence and table</span> <span class="diffcontext">as</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> mapping to a</span> <span class="diffaddedchars" style="background-color:#ddfade;"> {{"hibernate_sequence"}}. Ideally though (keeping with the theme of {{@SequenceGenerator}} and {{@TableGenerator}} defining just overrides) we'd want the</span> <span class="diffcontext"> sequence</span> <span class="diffaddedchars" style="background-color:#ddfade;"> here to be</span> <span class="diffcontext"> named {{</span> <span class="diffaddedchars" style="background-color:#ddfade;">"my_db_sequence"}}.<br><br>So another part of the work here is to support that. This is controlled by a new setting {{hibernate.model.generator_name_as_sequence_name}}. By default, this is false which means that {{"</span> <span class="diffcontext">hibernate_sequence</span> <span class="diffaddedchars" style="background-color:#ddfade;">"</span> <span class="diffcontext">}}</span> <span class="diffaddedchars" style="background-color:#ddfade;"> will be used for any case where {{@SequenceGenerator#sequenceName}} or {{@TableGenerator#table}} is not specified</span> <span class="diffcontext">.</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> But</span> <span class="diffaddedchars" style="background-color:#ddfade;"> If</span> <span class="diffcontext"> this</span> <span class="diffaddedchars" style="background-color:#ddfade;"> setting</span> <span class="diffcontext"> is</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> about adding support</span> <span class="diffaddedchars" style="background-color:#ddfade;"> enabled, we would instead use the value specified</span> <span class="diffcontext"> for</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> interpreting it</span> <span class="diffaddedchars" style="background-color:#ddfade;"> {{@GeneratedValue#generator}}.<br><br>*_NOTE: we might decide to reverse this before releasing 5.3 such that the default is to use {{@GeneratedValue#generator}}</span> <span class="diffcontext"> as</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> being named</span> <span class="diffaddedchars" style="background-color:#ddfade;"> the the sequence/table name<br>_*<br><br><br>h3.</span> <span class="diffcontext"> {{</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">my_db_sequence</span> <span class="diffaddedchars" style="background-color:#ddfade;">IDENTITY</span> <span class="diffcontext">}}</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br>This discussion has no bearing on how {{GenerationType#IDENTITY}} is handled</span> <span class="diffcontext">.<br><br></span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">Additionally</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br>h3. {{AUTO}}<br><br>In keeping with "less typing == better"</span> <span class="diffcontext">, this</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> adds support for mappings like</span> <span class="diffaddedchars" style="background-color:#ddfade;"> also covers some cases related to {{GenerationType#AUTO}} specifically in how {{org.hibernate.boot.model.IdGeneratorStrategyInterpreter#determineGeneratorName}} can operate. This work changes the "parameter object" passed in to that method to give it access to the {{@GeneratedValue#generator}} value. At the moment, this only case this is used is to handle</span> <span class="diffcontext">:<br><br>{code}<br> @Id<br> @GeneratedValue( strategy = GenerationType.</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">SEQUENCE</span> <span class="diffaddedchars" style="background-color:#ddfade;">AUTO</span> <span class="diffcontext">, generator = "</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">my_db_sequence</span> <span class="diffaddedchars" style="background-color:#ddfade;">increment</span> <span class="diffcontext">" )<br> public Integer id;<br>{code}</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br>Previously this mapping would not work. Instead a user would have to say:<br><br>{code}<br> @Id<br> @GeneratedValue( strategy = GenerationType.AUTO, generator = "increment" )<br> @GenericGenerator( name="increment", strategy="increment" )<br> public Integer id;<br>{code}<br><br>"increment" generator is a Hibernate-specific, in-memory strategy performing simple incrementing for generating id values. Specifically it is a short-name for Hibernate's {{org.hibernate.id.IncrementGenerator}}. Generally speaking there is little need to configure {{IncrementGenerator}}, so requiring the {{@GenericGenerator}} is unnecessary in most cases.<br></span> </td>
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