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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

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

After the project is moved from TOMCAT7 to WEBLOGIC12C, the exception org. hibernate. QueryException: ClassNotFoundException occurs: Org. hibernate. hql. ast. HqlToken; I checked on the Internet, because hibernate3.0 is based on anlr HQL/SQL query translator, using antlr-x-x-x.jar, however weblogic. jar already contains the antrl class library, and weblogic. the jar loading sequence is limited than the jar

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

String hql= "Select C from Col C, userrole role where C.id=role.columnid and c.id=? and role.userid=?" this . Gethibernatetemplate (). Find (Hql,new Object[]{colid,userid}). Get (0); The Above returns an object entity that is of type Col String hql= "from Col C, userrole role where C.id=role.columnid and c.id=? and role.userid=?" this . Gethibernatetemp

1.HQL differs from Sql,from must be the name of the class that corresponds to the table reversal in the project.2. How to generate HQL statements using parameters:"= session.createquery (HQL); Query.setparameter (0, userId); // instead of the No. 0 question mark3.HQL can not write limit, but he has the method can be s

HQL:public boolean docreate (Dept vo) throws Exception {return this.sessionFactory.getCurrentSession (). Save (VO)! = null;} @Overridepublic boolean doupdate (Dept vo) throws Exception {String hql = "UPDATE Dept as D SET d.title=?" WHERE d.deptid=? "; Query query = this.sessionFactory.getCurrentSession (). CreateQuery (HQL); query.setstring (0, Vo.gettitle ()); Query.setinteger (1, Vo.getdeptid ()); return

HQL basic Query simple Query result for output and Iterator output, hqliterator The first HQL course: Hibernate Query Language: hibernate Query Language 　　 Syntax: Query: String hql = "from dept "; Query query = session. createQuery (hql); // returns the list set. Query is an object with many methods. The. list () meth

SQL ( Structured Query Language ) is the relational database query language. the from is followed by the "table name", where the condition is followed by "field in table"HQL ( Hibernate Query Language ) is an object-oriented query , The from is followed by the table name, where the condition is followed by the field in the table. When you use queries in Hibernate,Generally use HQL query statements. Becau