hql requirements

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

NET Pick one: Sql:select c.* from card C left JOIN score s on s.card_id = C.id and S.invalid_date >=curdate () where s.id is nullTo use the LEFT join in hibernate you must declare an association mapping, where the association is One-to-many, a set scores is built in the card, and then configuredThe only special thing is that the WHERE,HQL cannot be written on, so the conditions on it are written in the where, where is the field name and the SQL for th

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

PackageCom.hfview.bean;ImportJavax.persistence.Column;Importjavax.persistence.Entity;ImportJavax.persistence.Id;Importjavax.persistence.Table;@Table(name ="T_card", schema="ZHW")@Entity Public class Card { PrivateString ID;PrivateString cardId;PrivateString area;@Id @Column(name="ID") PublicStringgetId() {returnId } Public void setId(String ID) { This. id = ID; }@Column(name="CARDID") PublicStringGetcardid() {returnCardId; } Public void Setcardid(String cardId) { This. cardId = CardId; }

JPQL is an object-oriented query language, so it can fully understand the characteristics of inheritance, polymorphism, and correlation. And JPQL has built-in a lot of functions, greatly facilitates the function of JPQL query. Of course JPQL is still SQL-based, but the JPQL-to-SQL conversion does not need to be a developer's concern, and the JPQL parser is responsible for completing this transformation, and is responsible for executing the SQL statement to update the database.SQL is a query lang

Tags: blog code int get HTTP stringPaip. Methods for taking the day's records SQL and HQL hibernate#------of two ways ... function method and Date calculation method:Function method: DATEDIFF (D,createtime,getdate ()) =0//d specified as DayHB also has the same function:Date calculation method: Where createtime>= ' 2014-5-4 00:00:01 ' and createtimewhere createtime= ' 2014-5-4 00:00:00 'The date calculation should be used preferentially, because this m

Hql Operator QBC Operator Description = Restrictions. eq () Equal to equal Restrictions. Ne () Not equal to not equal > Restrictions. gt () Greater than greater > = Restrictions. Ge () Greater than or equal to greater than or equal Restrictions. LT () Less than less Restrictions. Le () Less than or equal to less than or equal Is null Restrict

Error code://list vlist = This.gethibernatetemplate (). Find ("From Androidcustomer ct where ct.token =" +token);Correct code: List vlist= this.gethibernatetemplate (). Find ("from Androidcustomer a where a.token= '" + token+ "'");Here the token is a string, ( when a string or a date must have a single quotation mark , because in the database query when the use of single quotes)When used as a number, it is not possible to use single quotation marks, because in PL/SQL, when querying and not using

literals 'foo', 69, '2017-01-01 10:00:01. 0' Java public static final constants eg. color. Tabby I don't have to explain anything else. Here I just want to explain the parameters in the query:We know that when passing parameters in SQL for query, we usually use preparedstatement to write a lot of "?" In the statement,This method can also be used in hql, for example:List mates = sess. Find ("Select employee. name from employee as employee" +"Where emp

literals 'foo', 69, '2017-01-01 10:00:01. 0' Java public static final constants eg. color. Tabby I don't have to explain anything else. Here I just want to explain the parameters in the query:We know that when passing parameters in SQL for query, we usually use preparedstatement to write a lot of "?" In the statement,This method can also be used in hql, for example:List mates = sess. Find ("Select employee. name from employee as employee" +"Where emp

Hive optimization tips-How to Write HQL I. Hive join Optimization1. try to place the small table on the left of join. The hive-0.12.0 we use here is automatically converted. This means that the small table is automatically loaded into the memory and the map side join is executed (with good performance ), this is done by the hive parameter. auto. convert. join = true and hive. smalltable. filesize = 25000000L) parameter control (25 MB by default). If t

Hibernate uses hql for Chinese sorting, Why does MySQL not support Chinese sorting? No way. You only need to wait for utf8_unicode_cn to come out. If you want to implement cross-database with hibernate and do not want to change the code, I will tell you the answer below. Method 1. Description: register a sorting method for the MySQL dialect package of Hibernate. MySQL Chinese sorting is implemented in this method. Code: public class MySQLExtendDialec

Public listThis article from "Monkey also crazy" blog, declined reprint!HQL in Query

Paging:Before using the hibernate-encapsulated paging method, let's review the native paging practices in Oracle1 --Paging Query2 --(pageNo-1) *pagesize= start line pageno*pagesize= end line3 Select * from(4 SelectRowNum rm,s.* from(5 Select * fromMyfirsttbOrder byStuagedesc) s6 whereRowNum5) 7 whereRm>=2;8 Generally use three layer to do paging queryNow we understand how hibernate provides paging.Query object provides a method for paging queries1. Starting Line:S

Chinese issue about the hql Commander window of hibern8ide -- Long story short. System Environment:Hibernate 2.1Hibernate-extensions-2.1.2Eclipse 3.0Ant 1.6Oracle 8.1.7 Find a directory \ hibernate-extensions-2.1.2 \ hibern8ide \ SRC \ net \ SF \ hibern8ide \ highlighter The following editordocument. Java File Modify row 24th Styleconstants. setfontfamily (defaultstyle, ""); Then use ant to re-compile hibern8ide C:/> ant jar A new hibern8

Nhibbench series Learning (2)-use SQL, hql, and linq, nhibernatehql 1. This article mainly introduces three kinds of NH query methods 2. view the interface Namespace KimismeDemo {public partial class Form2: Form {private ISession session; private ISessionFactory factory; private ITransaction trans; public Form2 () {InitializeComponent () ;}# region 1. initialize NH-private void Form2_Load (object sender, EventArgs e) private void Form2_Load (object

Use DetachedCriteria to construct HQL parameter dynamic match, detachedcriteria This article is based on Spring MVC + Spring + Hibernate platform. 1. DetachedCriteria build class: CriteriaBuilder. java package com.ims.persistence.base;import java.math.BigDecimal;import java.sql.Types;import java.util.Map;import org.apache.commons.lang3.StringUtils;import org.hibernate.criterion.Criterion;import org.hibernate.criterion.DetachedCriteria;import org.hibe