hibernate-criteria | 易学教程

Issue with selecting max id rows using criteria query / hibernate query?

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问题 I am unable to select the rows where TestId is max for respective student, I wrote the code as follows which does not get the required output. my code is as follows, Criteria c = sessionFactory.getCurrentSession().createCriteria(student.class).setProjection(Projections.projectionList().add(Projections.property("answer"),"answer")); c.add(Restrictions.eq("surveyId",send_Survey)); //c.add(Restrictions.eq("testId", "1" )); //c.setProjection(Projection.max("testId")); c.addOrder(Order.desc(

How to use Oracle query hint in Hibernate

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问题 I am trying to use Oracle hint in Hibernate to call force index, but didn't find any proper API in Hibernate 3.6.10.Final. I somehow tried with projections in Hibernate criteria: proList.add(Projections.sqlProjection("/*+ INDEX_DESC(CONTACT_USER_FK_I) */", new String[]{}, new Type[]{})); proList.add(Projections.property("objectId")); criteria.setProjection(proList); return criteria.list(); But I am getting the exception below: EXCEPTION Caused by: 8 SQL Error (could not execute query; SQL

Common criteria restriction in Hibernate for all queries for all tables

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I have already finished writing a lot of queries in hibernate for my project. Now my requirement has changed and a new column name ACTIVE is added in all the tables I have in MySql. I have no permission to deny the addition of ACTIVE column. The ACTIVE field can hold values true or false and I have to add that to the criteria too. So, I have been thinking is there a way I could add a criteria restriction in Hibernate that is kind of common to all the queries I make, instead of putting that criteria for every query I make? EDIT: Little misunderstanding I suppose, sorry for that, I was in hurry

Ignorecase for In-Criterion

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问题 i'd like to select items case insensitive with an In-Criterion with Hibernate Criteria API. E.g. Criteria crit = session.createCriteria(Item.class); crit.add(Restrictions.in("prop", valueList).ignoreCase()); Unfortunately the Criterion class doesn't has an ignoreCase method. HQL is not an alternative. 回答1: Get the source code of the Criterion class returned by Restrictions.in() ( InExpression ), and create another one which is similar but transforms all the elements of the value list to

hibernate update single column using criteria

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问题 I have a table that contains mamy columns and I want to update the one or few columns of the row without effecting remaining columns I can write query: update table as t set t.a=:a set t.b=:b where t.id=1 But seen I dont know which columns will be selected to update, and I think it is not a good idea to write every query for every scenarios. Well, I have to write query for every scenarios, but I am looking for a better way to update the table dynamically. I am thinking criteria would be a

Use Hibernate Criteria for filtering keys and values in Map

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问题 I have the following persisted class: public class Code { @ElementCollection(targetClass = CodeValue.class) @MapKeyClass(CodeProperty.class) @JoinTable(name="code_properties") @CreateIfNull( value = false ) private Map<CodeProperty,CodeValue> propertiesMap = new HashMap<CodeProperty, CodeValue>(); ... } public class CodeProperty { private String name; ... } public class CodeValue { private String value; ... } And I'm trying to get a list of Code filtered by some properties I have in

Query @ElementCollection JPA

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问题 I have an Entity Transaction as following : @Entity class Transaction extends AbstractEntity<Long>{ private static final long serialVersionUID = 7222139865127600245L; //other attributes @ElementCollection(fetch = FetchType.EAGER, targetClass = java.lang.String.class) @CollectionTable(name = "transaction_properties", joinColumns = @JoinColumn(name = "p_id")) @MapKeyColumn(name = "propertyKey") @Column(name = "propertyValue") private Map<String, String> properties; //getters and setters } So,

How to group by projections with Hibernate

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I need to find a list of students that are in a specific group and located in a specific address along with their phone numbers in their location. My main issue is I can not retrieve phone numbers of each student as a collection. For example if I have student1,student2. Phone 1111 for student1 in location1 and phone 2222 and phone 3333 for student2 in location 1 and phone 444 for student2 in location2. Lets say I have Student1 Alex group1 1111 Location1 Street1 Student3 Jack group1 93939 Location2 Street4 Student7 Joe group2 22223 Location4 Street8 Student2 John group1 2222 3333 Location1

Hibernate Criteria Left Excluding JOIN

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I have no ideas how to do it using Hibernate Criteria SELECT * FROM Table_A A LEFT JOIN Table_B B ON A.Key = B.Key WHERE B.Key IS NULL there is Hibernate mapping like @Entity class A{ @Id @Column(name = "ID") private String ID; ... // fields } @Entity class B{ ... // fields @OneToOne(fetch = FetchType.EAGER) @JoinColumn(name = "A_ID", referencedColumnName = "ID") @Cascade(CascadeType.DETACH) private A a; ... // fields } So I need to get list of all A which are not referred by B Not tried it before, but something like this should work: select * from Table_A a where a not in ( select b.a from

How to use Oracle query hint in Hibernate

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I am trying to use Oracle hint in Hibernate to call force index, but didn't find any proper API in Hibernate 3.6.10.Final. I somehow tried with projections in Hibernate criteria: proList.add(Projections.sqlProjection("/*+ INDEX_DESC(CONTACT_USER_FK_I) */", new String[]{}, new Type[]{})); proList.add(Projections.property("objectId")); criteria.setProjection(proList); return criteria.list(); But I am getting the exception below: EXCEPTION Caused by: 8 SQL Error (could not execute query; SQL [select /*+ INDEX_DESC(CONTACT_USER_FK_I) */, this_.CONTACT_ID as y0_ from R4GDEV01_MBW.CONTACT this_ w