YAGDAO Yet Another DAO Hibernate Guide

yagdao   Mert Can Akkan  

overview  Popular Java ORM layer  JPA 2.0  Hibernate  Spring 3.0+ Support (optional)  Lightweight  No Implementation Framework  No Static Code Generation  Annotation Based  GenericDAO/CRUD operations  Custom operations

dependency-heaven GroupIdArtifactIdVersionOptional cglib 2.2No commons-logging 1.0.2No org.antlrantlr-runtime3.2No org.slf4jslf4j-log4j No org.apache.geronimo.specsgeronimo-jpa_2.0_spec1.1JPA org.hibernatehibernate-core3.5.1-Finalhibernate org.hibernatehibernate-entitymanager3.5.1-Finalhibernate org.springframeworkspring-beans3.0.4.RELEASEspring support org.springframeworkspring-jdbc3.0.4.RELEASEspring support org.springframeworkspring-orm3.0.4.RELEASESpring support Lightweight framework with minimal dependency

maven dependecy com.altuure com.altuure.yagdao repo.altuure.com default

my first yagdao  easy implementation public interface UserDAO extends GenericDAO { }

quickstart  GenericHibernateDAOFactory userDAO = (UserDAO) GenericHibernateDAOFactory.createInstance(UserDAO.class, sessionAccessor); The GenericHibernateDAOFactory will create instance of given DAO at the runtime

springframework support  package scan feature <yagdao:hibernate id="DAOFactory1" base-package="com.altuure.yagdao.blog.dao" session-factory=" mySessionFactory "/>  one by one definition <yagdao:hibernate base-class="com.altuure.yagdao.blog.dao.UserDAO" session-factory="mySessionFactory"/>

GenericDAO  save(Object entity)  update(Object entity)  load(T id)  loadLazy(T id)  delete(Object object)  delete(T id)  vs….

custom methods create & update  Get rid of all setter and getter operations public interface UserDAO extends GenericDAO = YMethodType.SAVE) User = YMethodType.UPDATE) User updateRoles(long roles); }

custom methods query  Embeded Query type = YMethodType.QUERY, query="select u.username from User u where u. =: “ ) String = " ")String );  Named Query = YMethodType.QUERY,queryName="findBy ") String = " ")String );

custom methods = YMethodType.EXECUTE, query="update User set password=:password") int updateAllPasswords(String newPassword); Tip: All execute methods must return an integer

custom methods = YMethodType.APPEND, select = "pbyte,count(id)", groupBy = "pbyte", having = "count(id)>10") List int i);  APPEND Method handler is a simple query builder in which you can append query strings with not null parameters

custom methods criteria &count(experimental)  Criteria method handler is like append method handler tries to build a query with not null values by parsing query parameters.  Due to incomplete criteria API of hibernate it supports hibernate partially

custom methods = YMethodType.CRITERIA) SearchResultList = "pint", operator = YOperator.GE) Integer arg1); Custom Paging and order is supported Selected field and fetch are supported Grouping and having clauses are not supported

custom methods = YMethodType.COUNT) long = "pint", operator = YOperator.GE) Integer = "pdate", operator = YOperator.LE) Date endDate); Returns only count query result of criteria method To execute both see SearchResultList

smart parameters & return types  YPage: enables order and paging  criteria methods  YLimit: enables only paging  append method  criteria methods  SearchResultList: fetch total size of result list public SearchResultList(List result, long totalCount, YPage paging) { super(result); this.totalCount = totalCount; this.paging = paging; }

paging To add paging to any querying method is easy just add YPage,YLimit as a method = YMethodType.APPEND,orderBy = "id desc") SearchResultList byte arg1,YLimit limit); PS: YLimit is valid in all while YPage is valid on only Criteria Methods

prefetch result size Defining ‘SearchResultList’ as a return type enables a count queires for all = YMethodType.CRITERIA) SearchResultList = "pint", operator = YOperator.GE) Integer arg1);

and more  Object based and method based fetch = "product", "order", "order.customer" }) List findByCustomerCityAndMaxPrice2(…);  projection support at append methods

thanks For more please see sample application: maven jetty:run