Google Patents US7849439B2 - Application-generic sequence diagram generator driven by a non-proprietary language override the generate method to add the date as a prefix.US7849439B2 - Application-generic sequence diagram generator driven by a non-proprietary language.override the configure method to read the additional configuration parameters and.You extend Hibernate’s SequenceStyleGenerator class,.The rest of it follows the same principle: The main difference is that you need to configure a date format that will be used to create the prefix. ![]() The implementation of a custom id generator that uses parts of the current date as a prefix is pretty similar to the one that uses a configurable String. 14:58:34,262 DEBUG - insert into Book (publisherid, publishingDate, title, version, id) values (?, ?, ?, ?, ?)ġ4:58:34,263 TRACE - binding parameter as - ġ4:58:34,264 TRACE - binding parameter as - ġ4:58:34,265 TRACE - binding parameter as - ġ4:58:34,266 TRACE - binding parameter as - ġ4:58:34,266 TRACE - binding parameter as - Year and month followed by a sequence-based value When you now persist a new Book entity, Hibernate generates a primary key following the format B_00001. In this example, I add padding zeros to ensure that value consists of 5 digits. ![]() NUMBER_FORMAT_PARAMETER specifies the format String of the sequence value.This is one of the parameters handled in the configure method. VALUE_PREFIX_PARAMETER defines the prefix of your primary key value.The annotation sets this parameter by default, and I highly recommend that you configure it for your custom generator. INCREMENT_PARAM activates Hibernate’s high-low optimization.In this example, I set the following 3, optional parameters: You can also configure a set of parameters that will be provided to the configure method when Hibernate instantiates the generator. If you want to use a custom generator, you need to define the generator in a annotation and provide the fully-qualified classname as the strategy. You probably already used the annotation to tell Hibernate to use a database sequence or an auto-incremented database column to generate your primary key values. public class StringPrefixedSequenceIdGenerator extends SequenceStyleGenerator ) If you extend that class, you only need to add your prefix and format the sequence value in your preferred way. Hibernate’s SequenceStyleGenerator already does most of the heavy lifting, like the handling of different database dialects or the implementation of various performance optimizations. 3.1 Use the PublisherCodePrefixedSequenceIdGeneratorĪ fixed String followed by a sequence-based value.3 An attribute value of a parent entity followed by a sequence-based value.2.1 Use the DatePrefixedSequenceIdGenerator.2 Year and month followed by a sequence-based value.1.3 Use the StringPrefixedSequenceIdGenerator. ![]()
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