If the identifier property is null, then the entity is assumed to be new. Without such a Version-property Spring Data JPA inspects the identifier property of the given entity. If there is, the entity is considered new if the value of that property is null. Version-Property and Id-Property inspection ( default):īy default Spring Data JPA inspects first if there is a Version-property of non-primitive type. To create a query method that supports dynamic sorting, see “ Special parameter handling”. You can apply static ordering by appending an OrderBy clause to the query method that references a property and by providing a sorting direction ( Asc or Desc). Whether ignoring cases is supported may vary by store, so consult the relevant sections in the reference documentation for the store-specific query method. The method parser supports setting an IgnoreCase flag for individual properties (for example, findByLastnameIgnoreCase(…)) or for all properties of a type that supports ignoring case (usually String instances - for example, findByLastnameAndFirstnameAllIgnoreCase(…)). The supported operators can vary by datastore, so consult the appropriate part of your reference documentation. You also get support for operators such as Between, LessThan, GreaterThan, and Like for the property expressions. You can combine property expressions with AND and OR. The expressions are usually property traversals combined with operators that can be concatenated. It allows quick query definition by method names but also custom-tuning of these queries by introducing declared queries as needed. This is the default lookup strategy and, thus, is used if you do not configure anything explicitly. It looks up a declared query first, and, if no declared query is found, it creates a custom method name-based query. If the repository infrastructure does not find a declared query for the method at bootstrap time, it fails.ĬREATE_IF_NOT_FOUND (the default) combines CREATE and USE_DECLARED_QUERY. See the documentation of the specific store to find available options for that store. The query can be defined by an annotation somewhere or declared by other means. USE_DECLARED_QUERY tries to find a declared query and throws an exception if it cannot find one. You can read more about query construction in “ Query Creation”. The general approach is to remove a given set of well known prefixes from the method name and parse the rest of the method.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |