hql application

HQL: Fully Object-oriented queryexecution order of SQL :1. from2.Where to filter the underlying data The difference between where and having : 1. different order 2.where filtering underlying data 3. filtering aggregate functions3.Group by4.Select5. Having6.Order byUse Hibernate Query , use One of Hibernate interface queryHQL is an object-oriented query statement , so it is followed by the class nameQuery query = Session.createquery ("Select Id,name

ts=se.begintransaction (); Se.saveorupdate (U1); System.Out.println (U1); }Test hql@TestPublicvoidTEST5 (){Using HQL1 Create a Query object query Qu=se.createquery ("From User where UserID;? and "+"UserName like ' Test% ' order by UserID");Set Placeholder Qu.setinteger (0,10);Execute Query listMethod Chain CallLu=se.createquery ("from User where UserID;?"). Setinteger (0, ten). List ();for (User e:lu) {System.Out.println (e); }}Test paging @TestPubli

The 1.map uses Var hql=string. Format (@ "Select New Map (TC. Limitindextype as LIMITINDEXTYPE,TC. Limitscope as LIMITSCOPE,TB. ID as ID) from Baslimitconfig tb,basproductgroup ta, Baslimittype TC where TB. Limitdim1id =ta. Id and TB. LIMITDIM2ID = TC. Id ");//This is the package of my framework is actually the session. Createqueryvar List2 = dao.findlist　　Nhibernate HQL Anonymous Class (strictly speaking t

One, find (String queryString);Example: This.gethibernatetemplate (). Find ("From Bean". User ");Returns all user objectsTwo, find (String queryString, Object value);Example: This.gethibernatetemplate (). Find ("From Bean". User u where u.name=? "," Test ");or fuzzy query: This.gethibernatetemplate (). Find ("From Bean". User u where u.name like? ","%test% ");Returns an object with the Name property value of test (fuzzy query that returns the object with the Name property value containing test)T

Use the Hibernate framework to generate executable SQL statements for hql-Oracle DialectIntroduction: Why is this requirement derived from the company's project requirements? The company's project uses java's struts2 + spring2.5 + oracle middleware tuxedo. The database uses Oracle, but because it does not directly connect to the database, the middleware processing method does not require too many services, so the network began to look for data encodin

HQL in keyword query reported "Ljava.lang.Long; Cannot is cast to Java.lang.Long "exception.Incoming parametersLong[] Type: useridsLong type: RIDQuery q = getsession (). CreateQuery ("Select User from user user join User.roles as role where role.id Q.setparameter ("RID", RID);q.setparameter ("UIDs", UIDs);The error message for executing this code is as follows:650) this.width=650; "class=" Magplus "title=" click to view original size picture "src=" ht

There are now entity classes Student and user.public class student{Private String ID;Private Sting classroom;private user user;@Id@GeneratedValue (generator = "Paymentablegenerator")@GenericGenerator (name = "Paymentablegenerator", strategy = "uuid")@Column (name = "ID", nullable=false,length=36)Public String getId () { return this.id;}@ManyToOne (fetch = Fetchtype.eager)@JoinColumn (name = "USER")@ForeignKey (name= "null")Public USER GetUser () { return user;}public void SetUser (user user)

The parameters passed through the ValueList QueryMap are all string types, and in the hql of the ValueList configuration file, a field that assigns the value directly to an integer will be an error. In general, we will use transformation functions in HQL for processing, as follows: Copy Code code as follows: from Com.berheley.hcms.persistence.model.TBaseAreas as TB where tb.status= ' 1 ' /~h

The parameters passed through the ValueList QueryMap are all string types, and in the hql of the ValueList configuration file, a field that assigns the value directly to an integer will be an error. In general, we will use transformation functions in HQL for processing, as follows: Copy Code code as follows: From Com.berheley.hcms.persistence.model.TBaseAreas as TB where tb.status= ' 1 ' /~hid

Go straight to the example. @SuppressWarnings ("Unchecked")@OverridePublic listtry {Date date=calendar.getinstance (). GetTime ();String hql = "from auctionitementity ai where ai.auctionevent.starttimeQuery query = Gethibernatetemplate (). Getsessionfactory (). Opensession (). CreateQuery (HQL);Query.settimestamp ("date", date);Query.setfirstresult (0);Query.setmaxresults (10);list. List ();return LST;}

Label:When we write hibernate ORM component, often encounter paging query this operation, the principle of paging query is not boil, the more important point is to calculate the total number of queries count, most people still use the traditional Hql/sql string interception or splicing and other ways to achieve. The code given below is implemented by means of string templates, regular matching, and so on, directly on the code:public class Querytemplat

Atitit Oodbms Query, Object-oriented SQL query JPA jpql hql1.1. Standard API history 1 1.2. jpa JPQL Span style= "font-family: Arial" > ( java persistence Query Language ) comparable to Jdbc query ability NBSP; NBSP; 1 1.3. operating API11.4. Hql21.1. Standard API history the standard is included in every step of the standard so JPA specification notifies all versions of JPA. in the JPA2.0 , standard query API, query standardization development. in the JPA2.1, standard updates

. Out. close (); // step 4 of ajax Return null; } } Action configuration file Xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns: p = "http://www.springframework.org/schema/p" Xsi: schemaLocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> Display result DaoImpl Package com. kane. dao. Impl; Signat

namespacechangingTen { One Public Static classNhelper A { - //Variable Declaration - StaticISession session =NULL; the StaticIsessionfactory factory =NULL; - StaticITransaction trans =NULL; - - //reading configuration Files + StaticConfiguration cfg =NewConfiguration (). Configure (@"Config/nhibernate.cfg.xml"); - + /// A ///Create session Factory at /// - /// - Public Staticisessionfactory Fa

Yes Oscache Org.hibernate.cache.OSCacheProvider Memory,disk Yes Swarmcache Org.hibernate.cache.SwarmCacheProvider Clustered (IP multicast) Yes (clustered invalidation) JBoss Cache 1.x Org.hibernate.cache.TreeCacheProvider Clustered (IP multicast), transactional Yes (replication) Yes (Clock sync req.) JBoss Cache 2 Org.hibernate.cache.jbc.JBossCacheRegionFactory

Package Com.etc.test;import Java.util.iterator;import Java.util.list;import org.hibernate.query;import Org.hibernate.session;import Org.junit.test;import Com.etc.dao.hibernatesessionfactory;import com.etc.entity.Dept Import Com.etc.entity.emp;public class Testd {//@Testpublic void FindAll () {Session s = Hibernatesessionfactory.getsession (); Query q = s.createquery ("from EMP emp where emp.ename like '%s% '"); list　　Hibernate HQL Summary (2)---Laoyan

Hibernate.cfg.xml configuration: 　　Hibernate---HQL query 2---

1 , basic query 1, non-conditional query 2. Query with conditions 3, through the parameters of the query 4. Query by named parameters 5. Querying empty elements 2 , common query 1. List query (in ()) 2. Projection Query 3, projection of an element query ( NOTE: You cannot use SELECT * to query ) 4. Other types of projection 5. Single element query (Uniqueresult) 6, paging query 3 , Object-based queries, and SQL Native Query There is also an object-based query in hibernate Queries can

HQL operation1. Distribute byDistribute by Col Scatter data across Col columns to different reduceSortSort by col sorts data according to Col columnSelect COL,CO2 from table_name distribute by col1 Sort by col1Asc,col2 desc;The combination of both ensures that the output of each reduce is orderlyApplication Scenarios:* The file size of map output is not uniform* Reduce output file size is not uniform* Too many small files* File size is very large2. Cl

1. the query result is part of the table field, not all Ad is a couponad object Coupon is an attribute of AD and also an entity class. Select ad. Coupon from couponad ad where ad. Deleted = false order by createddate DESC 2. Like Fuzzy search Here, the variable key is of the string type. String hql = "from Coupon coupon where coupon.deleted=false and coupon.name like :key"; Map 3. Total number of queries public int getTotalCou