hibernate-mapping

问题 I've got a class (representing a project) which maps another class (representing a user) through a many-to-one relationship. As users come and go I've made sure to set the not-found property to ignore on the relationship. However, it appears that Hibernate still attempts to load the "missing" users by executing one extra SQL query for each of the projects where the not-found property should have set the relationship to null . That is, in cases where the associated user no long exist, I would

问题 Aftre migrate my application from hibernate 4 to hibernate 5 .my sequence dose not work and hibernate use our default sequence instead of my sequence .my mapping config in hbm like this my database is oracle . <id name="id" column="Id" type="java.lang.Long"> <generator class="sequence" > <param name="sequence">SEQ_APP_Login_Log</param> </generator> </id> after google some people say change class to org.hibernate.id.enhanced.SequenceStyleGenerator but dose not work again. 回答1: It's simple. The

问题 first of all I couldn't find an answer from related questions in this forum. I am new to Hibernate technology and I am trying to run a basic example from this page: http://www.roseindia.net/hibernate/hibernate4/firstHibernateApplication.shtml Although, in eclipse it worked fine, I've got a problem with Intellij IDEA. Specifically, I have an error in the hibernate.cfg.xml file which says: " 'com.mysql.jdbc.Driver' is not assignable to 'java.sql.Driver' ". And when I run the program a message

问题 I am working On Hibernate With Spring If first i created database and i used Hibernate DAOs layer along with DAOsImpl. and i simply mapped my model classes to database tables with simple mapping.then what is the use of Collection Mapping,Association Mapping???? without collection mapping and association mapping i can do my work whatever i want. please give me any good explanation. 回答1: When you are mapping your model classes you are mapping the entities to the database, specifying types of

问题 I have two mapped class with hibernate: SETTLEMENT_MODEL_GROUP (the parent): @Entity @Table(name = "MODEL_GROUP") public class SettlementModelGroup { //omitted some not fields @OneToMany( fetch = FetchType.LAZY, mappedBy = "modelGroup" ) private List<SettlementModel> settlementModels; } SETTLEMENT_MODEL childs: @Entity @Table(name = "MODEL") public class SettlementModel { //omitted some not fields @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "MODEL_GROUP_ID", insertable = false,

问题 i want update to databgase one of properties for UserData which have(name,street,city,etc) so: Relationship & DB properties: This UserData have a bi-directional relationship with his User where cascade="save-update" on User.hbm.xml is used, so User have this properties in DB (id_user, Foreign key: id_UserDetail, status) UserData have (id_UserDetail, Foreign key: id_User, and classic info fields name,street,telephone,etc ) I use this method to update to database: Update method public void

问题 I have this HQL query which returns me an Empty Resultset : FROM MeetingSchedule ms JOIN FETCH ms.client JOIN FETCH ms.employees JOIN FETCH ms.parts WHERE ms.meetingId = :meetingId; If I execute SQL Query gives me result select * from meeting_schedule where meeting_id = ?; How to debug this query? What will be the cause for Empty Resultset ? PS: SQL Query is just to inform you that my MeetingSchedule is not null, I can post generated SQL Query here if you want. Thank you in advanced. 回答1:

问题 I have a query which is executed from java application like this: Query query = getEntityManager().createQuery(hql); The query looks like this: String hql = "select * from table a where round(column1, 3) = round(parameter, 3)"; Here column1 is of type Double . The value it holds is like 143.02856666 . I need to retain the value as it is, but for some business logic just need to round and compare. The initial database configured was H2 and this worked fine. Now the database has been changed to

问题 I have a MySQL stored procedure which accepts two input dates and returns EmpCode , Name , Department , Employee_Absent_Date and Total_No_OF_Days Stored procedure (employee absent report for two given dates range): DELIMITER $$ DROP PROCEDURE IF EXISTS `AbsentReportproc`$$ CREATE DEFINER=`root`@`localhost` PROCEDURE `AbsentReportproc`(IN _fromdate DATETIME, IN _todate DATETIME) BEGIN CREATE TEMPORARY TABLE daterange25 (dte DATE); SET @counter := -1; WHILE (@counter < DATEDIFF(DATE(_todate),

问题 I have a hibernate mapping file ParcelServicePresetIds.hbm.xml: <hibernate-mapping> <class name="de.delife.sql.ParcelServicePresetIds" table="ParcelServicePresetIDs" schema="dbo" catalog="xxx"> <id name="id" type="int"> <column name="ID" /> <generator class="assigned" /> </id> <many-to-one name="itemsBase" class="de.sql.ItemsBase" fetch="select" property-ref="itemId"> <column name="ItemID" /> </many-to-one> <property name="itemId" column="ItemID" type="java.lang.Integer"/> <property name=