hql application

(Object ... params) {try {String sql = "from Mainpagescanresult m"+ "WHERE m.errorpercent > 5.0" + "and M.inneruuid =?"+ "and M.taskid =?";Session session = Sessionfactory.getcurrentsession ();list. Setparameter (0, (String) params[0]). Setparameter (1, (Integer) params[1]). List ();if (!list.isempty ()) {Return List.get (0);}} catch (Exception e) {E.printstacktrace ();}return null;}/*** Querymainpagescanfailbyid (This method to achieve the results of the search page scan failed)** @Title: Quer

When I recently debugged a Web site with Eclipse, I found an old warning in the console: WARN [org.hibernate.hql.internal.ast.hqlsqlwalker]–[deprecation] encountered positional parameter near line 1, column 9 5. Positional parameter is considered de precated; Use named parameters or Jpa-style positional parameters instead. Search on the Internet to understand is the HQL statement in the query parameter placeholder use method obsolete. It is recommende

Hibernate is equipped with a very powerful Query Language, which looks like SQL. But do not be confused by syntax-structure similarity. hql is consciously designed as a fully Object-Oriented Query That can understand concepts such as inheritance, polymorphism, and association.1. Case sensitivity Except for the names of Java classes and attributes, query statements are not case sensitive. SoSelectAndSelectAndSelectIs the same,Org. hibernate. eg. fooNot

Hibernate is equipped with a very powerful query language, that is, HQL (Hibernate query Language), hql look like SQL, but just similar to the syntax structure, HQL is an object-oriented query, he can understand the concepts of inheritance, polymorphism.HQL are case-sensitive, and SQL statement keywords (such as SELECT, From,where, and so on) are case insensitive

Hibernate Query Language abbreviated to HQL, is the longest in the real development of hibernate package mode.HQL provides a query method that is closer to the traditional SQL statement:Entity query:where select * from TUser in the "from TUser" ==sql. is to poll all entities, and if Tuser has a sub-class table below it, all the data for the subclass table will be found.How to query a specified entity:Property query:Query the Name property collection f

With HQL: More search Help Use list as a condition result List lst.add(14); lst.add(15); lst.add(17); String hql = "from Students s where s.SId in (:lst)"; Query q = session.createQuery(hql); q.setParameterList("lst",lst); // 以一个实类作为参数条件 hql = "from Students s where s.class=:class"; q.setEntity("class",session.get(Cl

For example, for the Tuser class 1. Entity Query String hql = " from TUser"; Executing this statement returns the records of the Tuser and the Tuser subclass. Note: If the TUser class has a foreign key, the query will complain! Workaround: Select Alias. property from class as Alias. No aliases. Property still complains! hql = "from java.lang.Object" Returns a record of all the library tables in the d

Hql:hibernate Query Language. Features://>> 1, similar to SQL, the syntax in SQL is basically straightforward to use. >> 2,sql queries are columns in tables and tables; HQL queries are properties in objects and objects. >> 3,hql keywords are case-insensitive, and class names and property names are case-sensitive. >> 4,select can be omitted. 1, simple query, Employee is the entity name rather than the t

Hibernate Retrieval Method 1:hibernate provides the following ways to retrieve objects 1, the navigation object graph retrieval Method: Obtains the persistent entity object in the program, through the object Association, obtains the related entity object. For example: Session.get (department.class,1); Dept.getemps () 2, OID retrieval method: The session of Get or load based on the OID to find object 3, hql retrieval mode: query interface. Query by

When writing the HQL statement, if you use a custom function, HQL will not compile through the compilation process, we need to rewrite the next dialect dialect class, where my Oracle is 10, can inherit different Oracle dialect classes according to their Oracle version.Steps to resolve the error:First, rewrite the dialect class, such as Oracle10gdialectSecond, modify hibernate configuration file, the default

Parameter bindings for Hibernate HQL queries (2010-07-15 09:20:16)reproduced Tags: gossip Category: JAVA parameter bindings: 　　 Hibernatein the dynamic query parameter binding provides rich support, then what is the query parameter dynamic binding? In fact, if we're familiar with traditionJDBCprogramming, we are not difficult to understand the query parameters dynamic binding, the following code traditionJDBCparameter

Weblogic8.1 + hibernate3.0: the following error occurs when Weblogic is started: charscanner; panic: classnotfoundexception: org. hibernate. hql. Ast. hqltoken. Then the server crashes directly. Solution: Add a property hibernate. query. factory_class to hibernate. hql. Classic. classicquerytranslatorfactory in hibernate. properties or conext XML of spring. The value is org. hibernate.

Select clauseUsed to select a specified attribute or directly select an object. Of course, the select attribute must be an attribute contained in the from persistence class. For example: select p.name from Person as p Select can select any attribute, that is, not only the direct attribute of the persistence class can be selected, but also the attribute contained in the component property, such: select p.name.firstname from Person as p NormallyResult is setThe Set element is an array composed of

Hql queries some fields in a single table: In hibernate, the object class is queried using hql statements, and the returned result of the list method is a list. The objects encapsulated in the list are divided into the following three situations: 1. When you query all fields, such as "from object class", the objects encapsulated in the list are the object class, And all attributes are filled. 2. query on

HQL query:1. For the HQL query statement in the form of greetings, if more than one question mark, which is more troublesome to the following parameters.such as: From Student Student where student.name =? and student.age=?....For such assignments, error-proneAnother way of assigning a value can be usedsuch as: From Student Student where Student.name =:var1 and student.age=:var2 ....Query.setstring ("Var1",

String str = "Chinese string";String hql = "from Table as T WHERE t.field like '%" + str + "%";Query query = getsession (). CreateQuery (HQL);Query.list ();Using this form to pass in parameter str results in console output:From Table as T WHERE t.field like '%???? %'such as garbled, so that the database can not find matching records.It is said that this is a problem with the hibernate3.0 like clause dealing

String str = "Chinese string";String hql = "from Table as T WHERE t.field like '%" + str + "% '";Query query = getsession (). CreateQuery (HQL);Query.list ();Using this form to pass in the parameter str causes the console output:From Table as T WHERE t.field like '%???? %'To find a matching record in the database.It is said that this is an issue with the hibernate3.0 like clause dealing with Chinese, 3.1 ha

The first contact with Hibernate was in 2004, when with a disturbed and uneasy mood to learn this technology. After several years of use and research, but also accumulated some experience, the following HQL and QBC query to talk about my work from some of the summary. This article will not talk about what is hibernate, what is ORM, and how to use HQL and QBC. The purpose of this article is to make everyone

against the T_user table tables, querying the name, age, and user_id three data columns;The second statement is used to execute a query against the user entity, querying the name, age, and UserId properties of the user entity.Third, HQLHQL (Hibernate query Language) is an object-oriented query, followed by a "table name", where the condition is followed by "fields in the table." When you use queries in Hibernate,Generally use HQL query statements. Be

Tags: size table standard different for conversion sharing LIS styleBecause HQL is object-oriented, so the use of HQL in statistical data is inappropriate, in fact HQL will eventually be converted into SQL statements, the project uses HQL statements should be standardized. Statistical data: The same table, the same fie