Limit result set content a separate query condition is an instance of the Org. Criterion interface. The Org. Restrictions class defines a factory method that obtains some of the built-in criterion types. Hibernate provides a considerable number of built-in criterion types restrictions subclasses , but it is particularly useful to allow. The property instance is another way to get a condition.
You can create one by calling Property. Add Property. Note that the second Createcriteria returns a new criteria instance that references the elements in the Kittens collection.
This article is an English version of an article which is originally in the Chinese language on aliyun. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact alibabacloud. A staff member will contact you within 5 working days.
Once verified, infringing content will be removed immediately. The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to: info-contact alibabacloud. A comprehensive suite of global cloud computing services to power your business. Ordering the results Associations Dynamic association fetching Example queries Projections, aggregation and grouping Detached queries and subqueries Queries by natural identifier. Creating a Criteria instance. Narrowing the result set. Ordering the results. Dynamic association fetching.
Example queries. Projections, aggregation and grouping. Detached queries and subqueries. Criterion instances can be created through the Restrictions tool class.
Restrictions provides a large number of static methods, such as eq equal to , ge greater than or equal to , between, etc. In addition, Restrictions also provides methods to create instances of junction and disjunction, and add query conditions to the instance by adding Criteria method to form a query condition set. As for the creation of Example is different, Example itself provides a static method create Object entity , which is based on an object in practice, it is generally mapped to the database object to create.
EnableLike MatchMode. For example, the provided avg, count, max, min, and sum can make it easy for developers to perform statistical queries on a field. Property is to set the query conditions of a field, such as through the Property. Add to the query condition through the criteria's add Project method. Use Criteria query, the main should be clear is that Hibernate provides those classes and methods to meet the development of search query and create conditions for assembly, here are several uses: 1.
Creating a Criteria instance The org. Criteria interface represents a query of a specific persistent class. Session is a factory of Criteria instances. A single query condition that limits the content of the result set is one of the org. Criterion interface Examples.
The org. Restrictions class defines factory methods for obtaining certain built-in Criterion types. Property examples are another way to obtain a condition. You can create a Property by calling Property. Result set sorting You can use org. Order to sort the query results. Association You can use createCriteria to easily establish constraints between related entities. The main difference between Criteria and DetachedCriteria is that they are created in different forms.
The Spring framework provides the getHibernateTemplate. Criteria is online, so it is created by Hibernate Session;. You can set FetchMode the mode of joint query fetching and set the sorting method. The following is a detailed description of Criterion and Projection.
Criterion is the query condition of Criteria. Criteria provides the add Criterion criterion method to add query conditions.
0コメント