hql application

Hibernate query language or hql for short is extremelypowerful query language. hql is much like SQL and are case-insensitive, could t for the names of the Java classes and properties. Hibernate query language is usedTo execute queries against database. hibernate automatically generates the SQL query and execute it against underlying database if hql is used in the

HIBERNATE-HQL QueryHQL is the acronym for Hibernate Query Language, an object-oriented query language and the most common query language in hibernate.(i) Basic grammar of HQL Select "Property name" from "Object"where "condition"Group BY "attribute name" having "grouping condition"Order By "Property name" Desc/asc

The previous article discussed the connection query in the HQL query, its query syntax in the function and SQL connection query is the same, the inner join query obtains the Cartesian product between the relations, the outer join query is to obtain a relational table and with another relational table of the collection part, the specific use method see the previous article, Finally, the method of the external named query is discussed. This article will

DirectoryWrite in frontDocumentation and series articlesSeveral ways to queryHQL QueryAn exampleSummarizeWrite in frontThe previous article introduced the basic configuration of NHibernate in the project, including the setting of the database connection string, the configuration of the mapping file, and the place to be aware, this article describes the NHibernate query method.Documentation and series articles[Nhibernate] Architecture[NHibernate] Isessionfactory Configuration[NHibernate] Persiste

Last time we learned to use the criteria for the relevant operations, but because the criteria is not hibernate the official recommendation of the query, we do not use much. Now let's take a look at the official hql and learn about its strength.Say is HQL, namely Hibernate query statement, and SQL what is the difference? The difference of a letter, haha.Of course not, the difference between

The difference between 1.HQL and SQLSQL database-oriented table queryHQL Object-oriented queryHql:from followed by class name + Class object where to use the property of the object to do the conditionSql:from followed by the table name where to use the field in the table to make the conditionInquireWhen you use queries in Hibernate, you typically use HQL query statements.HQL (Hibernate query Language), Hibe

PackageCom.imooc.model;Importjava.util.List;ImportJava.util.Map;ImportOrg.hibernate.Query;Importorg.hibernate.Session;ImportOrg.junit.After;ImportOrg.junit.Before;Importorg.junit.Test;Importcom.imooc.util.HibernateSessionFactory; Public classSellertest {PrivateSession session =NULL; @Test Public voidtestselectclauseself () {String hql= "Select New Seller (s.name,s.tel,s.address) from Seller S"; Query Query=session.createquery (

This note continues to use the Dept Department table, EMP staff table, one-to-many pair of bidirectional mappings.1 Conditional query1.1 Query Employee Form EMP Age eage less than 30, monthly esal greater than 20000 employee name EnameSql:select ename from EMP where eageHql:select ename from Emp where eage1.2 Settings and aliases for question marksQuestion mark (? ) is set using the. Setparameter (position, property value) The position of the question mark in the SQL statement is starting at 1 a

ArticleDirectory Statement 1: it may cause SQL injection. Do not use it. Statement 2: Ado. Net style? Parameter. The Nhibernate parameter starts from 0. Statement 3: The name parameter is represented in the query string in the form of name. In this case, the IQUERY interface binds the actual parameter to the name parameter. Syntax 4: Name the parameter list. Add some parameters to a set list. For example, you can query whether data is in this set list. Content of this se

1./** * Query admin, query.list ()*/@Test Public voidEG1 () {Session session=NULL; Try{//Create sessionSession =hibernateutil.getsessionfactory (). Opensession (); //declares a variable and initializesString HQL ="From Admin"; //building a Query objectQuery query =session.createquery (HQL); //Execute QueryListquery.list (); //Traverse and output results for(Admin admin:adminlist) {System. out. p

The previous section describes the most basic entity classes. This section describes the HQL statement constructor, including query and update. Advantages: It is faster to construct HQL statements in an object-oriented manner and does not require manual HQL concatenation. Disadvantages: Encapsulation may reduce performance and only supports common and simple

Tags: blog detail user table call between object-oriented user repo CSDNTransfer from http://blog.csdn.net/aaa1117a8w5s6d/article/details/7757097 the difference between HQL and SQL Tags: sqlhibernatejavasessionuser database 2012-07-17 22:03 11614 People read comments (0) favorite reports Directory (?) [+]HQL is an object-oriented query, format: from + Class name + Class object + where + object properties

Hibernate hql query code instance, hibernatehql This article focuses on the content related to Hibernate hql queries, as detailed below.HQL Introduction Hibernate Query Language (HQL) is a fully Object-Oriented Query statement with powerful Query functions. It has the characteristics of polymorphism and association, HQL