SELECT elements(" hql where

hibernate hql (-many sub-queries)

There are two tables, the article (Article) and directories (Category). To find some one directory for all articles hql: from Article as a left join a.categories as c where c.id in (: ids) To identify some of the directory but does not belong to the ...

hibernate's HQL query

Medium at HQL keywords are not case-sensitive, but the property and the class name is case-sensitive 1, a simple query property * A single property query, return the result set list property, element type and entity type of the corresponding property type

HQL: Hibernate Query Language (Transfer from the official website)

HQL: Hibernate Query Language (Transfer from the official website) Chapter 15 HQL: Hibernate Query Language Hibernate is equipped with a very powerful query language, this language looks very much like SQL. Grammatical structure but do not be fooled ...

HQL statement Daquan (change)

Hibernate is equipped with a very powerful query language that looks very much like SQL. But do not be grammatical structure of the confusing similarity, HQL is very conscious of is designed to be fully object-oriented queries, it can understand concepts

hibernate ------ hql Summary (recommend a good one)

1. Query objects throughout the map all fields Java code / / Check out directly from a map object, namely: check the map all the fields in the object String hql = "from Users"; Query query = session.createQuery (hql); List <Users> users =

Hibernate HQL Example 3: Query property

According to property queries: Example

iBatis and Hibernate differences and choice of 5 elements

My time in the first selection, taking into account the different iBatis and Hibernate, originally intended to choose Hibernate, in the course of the study the characteristics found in iBatis, after analysis of comparisons I chose iBatis. Now I've bee

HQL query language 4

15.9. Order by clause query returns the list (list) can be returned in accordance with a class or component (components) of any property (property) to sort: Code content from DomesticCat cat order by cat.name asc, cat.weight desc, cat.birthdate The option

hibernate ------ hql Summary (reprint)

1. Check all the fields throughout the mapping object Java code / / Check out directly from a map object, that is: check all the fields throughout the mapping object String hql = "from Users"; Query query = session.createQuery (hql); List

HQL query and grammar

HQL:Hibernate Query Language HQL Is fully object-oriented query language, it can support features such as inheritance and polymorphism . HQL Query depends on the Query class , Each instance corresponds to a query object Query , HQL query by using The foll

HQl grammatical structure

Wrote 1.HQL: Hibernate Query Language 2.HQL is fully object-oriented query language, it can support features such as inheritance and polymorphism. 3.HQL query depends on the Query class, each corresponding to a query object Query instance, by using HQL qu

hql multi-table query

This is the work encountered a small problem on the user, department, role of the query terms, conditions, business needs is a multi-user search, the user object contains a collection of the department and the role of the object, the name of the user

Hibernate cache study

Hibernate cache Raiders (2007-07-18 21:51:37) Tags: hibernate Category: Hibernate Many people are not very familiar with the secondary cache, or there is a wrong understanding, I have always wanted to write an article tell us about the hibernate second ca

[Reprinted] in Hibernate applications how to handle batch updates and batch delete

Hibernate2.1 does not support batch updates and deletes, Batch update is the update in a transaction volume of data, bulk delete is deleted in a transaction volume of data. Hibernate API directly through the following programs CUSTOMERS table batch update

Hibernate3 and Hibernate2 difference

1.1 Hibernate API changes 1.1.1 Package Name 1.1.2 org.hibernate.classic package 1.1.3 Hibernate relies on third-party packages 1.1.4 Exception Model 1.1.5 Session Interface 1.1.6 createSQLQuery () 1.1.7 Lifecycle and Validatable Interface 1.1.8 Intercept

Detailed hibernate cache

hibernate provides the level of the session cache, each session, the same id twice a load, does not send two sql to the database, but turn off session, when a cache on a failure. SessionFactory level 2 cache is global cache, it can be used under different

Hibernate optimization program

First, batch modify and delete In Hibernate 2, if necessary for any data to modify and delete operations, are required to execute a query operation, has been at the want to amend or delete data, then data corresponding to the operation of treatment. Data

Hibernate's search method

Hibernate provides the following types of object retrieval approach. l navigation object graph search method. (Based on the object is already loaded, navigate to other objects.) l OID retrieval methods. (In accordance with the OID object to retrieve the o

Notes About Hibernate

Done memorandum EJB3 early exposure time enjoy the writing very hibernate and spring is now also supported haha In the past few years, Hibernate development, Java database almost become the de facto standard for persistence. It is very powerful, flexible

Hibernate code generation tools for the design of the entire Raiders -- Garden blog

Points Writing essay and the latest rankings here for easy access the main Ha ha - Big mouth Tsai - Big mouth Tsai - qianq put my keyboard with a small knife out of Alice, wiping a bit sensitive keyboard you reply! - steward good - students read the list

How to use the Java 5 Annotation (Notes) to simplify the Hibernate code

Note how to use Java 5 to simplify the Hibernate code, persistence layer and the coding process easier. Traditionally, Hibernate configuration relies on external XML documents: a database mapping is defined as a set of XML mapping file, and loaded at star

hibernate-depth study notes

hibernate-depth study notes Keywords: hibernate o / r maping Hb just in the fire is abuse, seen, but not very ormaping understand that we are now looking to re-hb, before many areas are not Now suddenly have a lot about all the basic . Logo generator incr

hibernate cache

hibernate The session provides a cache for each session, twice on the same id to load, does not send 2 sql to the database, but the session closed, a cache becomes ineffective. SessionFactory level 2 cache is a global cache, it can be used under different

Hibernate query program

Hibernate query program 1, the use of the Session interface load method or way to get 2, Hibernate query methods provided by the main 1) Criteria Query (query terms) the steps: (1) to create the conditions through the Session object query Criteria Criteri

Hibernate Study Notes (g)

Hibernate's Session After reading the 11th chapter, let me see the borders of Hibernate. Persistence context is a concept in theory. However, Hibernate, this has become a Hibernate on the Seesion (of course this is only for the beginners like me for).

hernate ehcach usage

What is 1.EhCache Hibernate's EhCache is one of the secondary cache, you can query from the data storage disk or in memory to save the next time the same query once again query the database, the database significantly reduce the pressure; Note the use

The use of struts + spring + hibernate assembly web application

This article will discuss how the combination of several well-known framework to achieve the purpose of loosely coupled and how to set up your framework, how to make your line all the application layer. Challenging are: combination of these frameworks so

Proficient in reading notes Hibernate

Generated Java classes Use the hibernate tools (hbm2java) Custom types associated with Achieve the UserType interface or CompositeUserType Interface Association expanding collection Chapter V complex, the Chinese version of 89. Hibernate mapping annotatio

hibernate call stored procedures

Chapter 17 Native SQL Query You can also use your database's Native SQL language to query data. This is the database you want to use some features of the time (such as query hints or the CONNECT keyword in Oracle), which is very useful. This can be re

Hibernate Performance Tuning

HIBERNATE help documentation in accordance with this article, a number of books and project experience in network order made, only the main points and ideas, specific practices can be a message to explore, or find some more detailed and more specific info

ssh error summary

SSH Error Summary Struts1.x 1, javax.servlet.ServletException: Must specify type attribute if name is specified You look at your jsp page, whether the tag name attribute is defined, if defined, then the type attribute must be defined. In general can be de

Hibernate mapping configuration properties to explain the relationship between

1. Attributes and their meaning hibernate-mapping properties auto-import (optional - defaults to true): Specifies whether we can in the query language, use of non-fully qualified class name (only in this mapping file in the class). package (optional): Spe

struts2 + hibernate3.2 + spring2.0 instance configuration + Getting Started

eclipse3.2, myeclipse5.0, Jboss4.0.3, sql server2000 sp3 Principle of In the java enterprise applications, ejb powerful ejb configuration with the complex and difficult to learn as well known. But in the past and what we do? Just bite the bullet and came

Transfer java written knowledge points

Java written test of knowledge transfer point from http://www.blogjava.net/javawin/archive/2010/03/15/315448.html HashMap & Hashtable: Map interface implementation class will be the only key is mapped to a particular value on: <key,value>. HashM

[Change] hibernate 2 cache Raiders

Many people are not understanding the secondary cache, or a misunderstanding, I always wanted to write an article introduce hibernate secondary cache, and today, could not. My experience mainly from hibernate2.1 version of the same basic principles and 3.

Hibernate in the 3-2-1

one-to-one, there are three ways to do one-to-many, there are two ways many-to-many there is a way. One-way many-to-one and one-way one-to-one is written is the same. Because one-way one-to-one is in a table set up outside the health. With foreign health

[Order] sql statement some practical tips for oracle

Finishing a book read long ago, and forgot what this was, now contributed. 1) In the select statement, use conditional logic 1select ename, sal, 2 case when sal <= 2000 then 'UNDERPAID' 3 when sal> = 4000 then 'OVERPAID' 4 else '

Using struts + spring + hibernate web application assembly

This article will discuss how the combination of several well-known framework to achieve the purpose of loose coupling, how to build your framework, how to make you be consistent in all the application layer. Challenging is: the combination of these frame

Hibernate Query Language

HQL: Hibernate Query Language Hibernate is equipped with a very powerful query language that looks very much like SQL. Grammatical structure, but do not be fooled by the similarity, HQL is very conscious of is designed to be fully object-oriented queries,

Frequently Asked Questions hibernate surface

1.Hibernate What are the different ways to query data (1) navigation object graph query (2) OID query (3) HQL (4) QBC (5) Local SQL 2.load () and get () the difference between load load method: Java code Users user = (Users) session.load (Users.class, use

EJB3 JPA JPQL statement subquery query use the function page

JPQL is a query language, has the similar features of SQL, JPQL is fully object-oriented, with inheritance, polymorphism and association, and hibernate HQL is very similar. Query parameters JPQL statement supports the parameters defined in two ways by: Na

(Change) Hibernate Study Notes 2

Meike inheritance tree map into a table: 1, understanding how to map Because the class inheritance tree is certainly correspond to multiple classes, multiple classes of information should be stored in a table, there must be some mechanism to distinguish w

oracel face questions

(1) in relation R, the algebraic expression 3 <4 (R) that () A. Select from the R value of 3 is less than the weight of the first four components of the relationship between the composition of the tuples B. Select from the R value less than the first t

Hibernate Native SQL mapping to solve problems

Where in the questionnaire and forums, often see people ask how to use the local SQL query results out of the value of the object mapped to the problem, here on the methods provided by Hibernate to be a conclusion. Premise, there are no delays in loading

Hibernate expression

/ / Hibernate expression 14.9. Expression in the where clause allows you to use the expression, including most of the expressions used in SQL types: Mathematical operators +, -, *, / Binary comparison operators =,> =, <=, <>,! =, Like Log

Reprinted: HIBERNATE face common questions

This carried over: http://talentdigger.cn/home/space.php?uid=6537&do=thread&id=5758 1.Hibernate What are the different ways to query data (1) navigation object graph query (2) OID query (3) HQL (4) QBC (5) Local SQL 2.load () and get () the differ

hibernate ehcache Xiangjie

Transfer from (http://www.blogjava.net/i369/articles/219407.html) What 1.EhCache EhCache is one of Hibernate second-level cache, you can check out the data stored in memory or disk, to save next time the same query once again query the database, significa

hibernate association mapping: many to one one-to-many Xiangjie (Reprinted)

One-way association (Unidirectional associations) Many to one (many to one) Unidirectional many-to-one association is the most common one-way association. <class name="Person"> <id name="id" column="personId">

Hibernate Summary (2)

This summary information Shangxue Tang video "Hibernate" Hibernate Summary (1) 12, many to many association mapping 1, the specific mapping: <set name="roles" table="t_user_role"> <key column="userid"/>

Re-learning Hibernate fetch lazy cascade inverse keywords

Hibernate most people is the first large collection of add-on form. N times the book read, or did not really understand Hibernate. So the next afternoon to do special tests on the configuration of the document know better. Suppose there are two tables, Ph
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