Question

我正在开发一些Spring MVC CRUD应用程序。遇到了一些奇怪的问题：

配置类：

package sbk.spring.simplejc.config;

import java.util.Properties;

import javax.annotation.Resource;
import javax.sql.DataSource;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate4.HibernateTransactionManager;
import org.springframework.orm.hibernate4.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.UrlBasedViewResolver;

@Configuration //Specifies the class as configuration
@ComponentScan("sbk.spring.simplejc") //Specifies which package to scan
//@Import({DataBaseConfig.class})
@EnableTransactionManagement
@PropertySource("classpath:application.properties")
@EnableWebMvc //Enables to use Spring's annotations in the code
public class WebAppConfig extends WebMvcConfigurerAdapter{
    private static final String PROPERTY_NAME_DATABASE_DRIVER                   = "db.driver";
    private static final String PROPERTY_NAME_DATABASE_PASSWORD                 = "db.password";
    private static final String PROPERTY_NAME_DATABASE_URL                      = "db.url";
    private static final String PROPERTY_NAME_DATABASE_USERNAME                 = "db.username";

    private static final String PROPERTY_NAME_HIBERNATE_DIALECT                 = "hibernate.dialect";
    private static final String PROPERTY_NAME_HIBERNATE_SHOW_SQL                = "hibernate.show_sql";
    private static final String PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN    = "entitymanager.packages.to.scan";
    @Resource
    private Environment env;

    @Bean
    public DataSource dataSource() {
            DriverManagerDataSource dataSource = new DriverManagerDataSource();
            dataSource.setDriverClassName(env.getRequiredProperty(PROPERTY_NAME_DATABASE_DRIVER));
            dataSource.setUrl(env.getRequiredProperty(PROPERTY_NAME_DATABASE_URL));
            dataSource.setUsername(env.getRequiredProperty(PROPERTY_NAME_DATABASE_USERNAME));
            dataSource.setPassword(env.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));
            return dataSource;
    }
    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource());     
        sessionFactoryBean.setPackagesToScan(env.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
        sessionFactoryBean.setHibernateProperties(hibProperties()); 
        return sessionFactoryBean;
    }   
    private Properties hibProperties() {
            Properties properties = new Properties();
            properties.put(PROPERTY_NAME_HIBERNATE_DIALECT, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
            properties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));
            return properties;        
    }
    @Bean
    public HibernateTransactionManager transactionManager() {
        HibernateTransactionManager transactionManager = new HibernateTransactionManager();
        transactionManager.setSessionFactory(sessionFactory().getObject());
        return transactionManager;
    }
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
            registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
    }
    @Bean
    public UrlBasedViewResolver setupViewResolver() {       
        UrlBasedViewResolver resolver = new UrlBasedViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        return resolver;
    }
}

application.properties：

#DB properties:  
db.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver 
db.url=jdbc:sqlserver://127.0.0.1:1433;databaseName=Examples 
db.username=sa
db.password=

#Hibernate Configuration:  
hibernate.dialect=org.hibernate.dialect.SQLServerDialect
hibernate.show_sql=true  
entitymanager.packages.to.scan=sbk.spring.simplejc.entity

@Entity上课：

package sbk.spring.simplejc.entity;


    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Table;

    @Entity
    @Table(name="Team")
    public class Team {
        @Id
        @GeneratedValue
        private Integer id;
        private String name;
        private Integer rating;
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public Integer getRating() {
            return rating;
        }
        public void setRating(Integer rating) {
            this.rating = rating;
        }
    }

控制器类：

package sbk.spring.simplejc.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import sbk.spring.simplejc.service.ITeamService;


@Controller
public class TeamController {
    @Autowired
    ITeamService service;

    @RequestMapping(value="/")
    public ModelAndView goToHelloPage() {
        ModelAndView view = new ModelAndView();
        view.addObject("teamList", service.listTeams());
        return view;
    }

}

错误堆栈跟踪：

    org.hibernate.hql.internal.ast.QuerySyntaxException: Team is not mapped [from Team]
        org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:180)
        org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:110)
        org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:93)
        org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:324)
        org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3420)
        org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3309)
        org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:706)
        org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:562)
        org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:299)
        org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:247)
        org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:248)
        org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:183)
        org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
        org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)
        org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
        org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168)
        org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:221)
        org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:199)
        org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1777)
        sbk.spring.simplejc.dao.HibTeamDAO.listTeams(HibTeamDAO.java:23)
        sbk.spring.simplejc.service.TeamService.listTeams(TeamService.java:27)

我对这个问题一无所知。

更新

DAO课程：

package sbk.spring.simplejc.dao;

    import java.util.List;

    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Repository;
    import sbk.spring.simplejc.entity.Team;

    @Repository
    public class HibTeamDAO implements TeamDAO {    
        @Autowired
        private SessionFactory sessionFactory;
        public void addTeam(Team team) {
            sessionFactory.getCurrentSession().save(team);
        }
        public void updateTeam(Team team) {     
            sessionFactory.getCurrentSession().update(team);
        }
        @SuppressWarnings("unchecked")
        public List<Team> listTeams() {
            return sessionFactory.getCurrentSession().createQuery("from Team").list();
        }
        @SuppressWarnings("unchecked")
        public Team getTeamById(Integer teamID) {
            Session     session         =       sessionFactory.getCurrentSession();     
            List<Team>  listTeam        =       session.createQuery("from Team t where t.id = :teamID")
                                                .setParameter("teamID", teamID)
                                                .list();
            return listTeam.size()  > 0 ? (Team)listTeam.get(0) : null;
        } 
        public void removeTeam(Integer teamID) {
            Team team = (Team) sessionFactory.getCurrentSession().load(Team.class, teamID);
            if(team != null){
                sessionFactory.getCurrentSession().delete(team);
            }
        }
        @Override
        public Integer count() {
            return (Integer) sessionFactory.getCurrentSession().createQuery("select count(t) from Team t").uniqueResult();
        }
    }

TeamController上课：

package sbk.spring.simplejc.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import sbk.spring.simplejc.service.ITeamService;


@Controller
public class TeamController {
    @Autowired
    ITeamService service;

    @RequestMapping(value="/")
    public ModelAndView goToHelloPage() {
        ModelAndView view = new ModelAndView();
        view.addObject("teamList", service.listTeams());
        return view;
    }

}

更新

现在我通过改变

中的DAO方法摆脱了这个问题

return sessionFactory.getCurrentSession().createQuery("from Team").list();

到

return sessionFactory.getCurrentSession().createQuery("from sbk.spring.simplejc.entity.Team").list();

但是收到了另一个问题：尽管Team表中存在行，但每个查询都返回null。

更新

最后我注意到了警告信息：

Feb 15, 2014 7:01:05 PM org.hibernate.hql.internal.QuerySplitter concreteQueries
WARN: HHH000183: no persistent classes found for query class: from sbk.spring.simplejc.entity.Team

更新

至少我通过在dataSource中的WebAppConfig bean定义中添加下一行代码来解决这个问题：

public LocalSessionFactoryBean sessionFactory() {
    LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
    sessionFactoryBean.setDataSource(dataSource());     
    sessionFactoryBean.setAnnotatedClasses(new Class[]{Team.class});//new row!!!
    sessionFactoryBean.setPackagesToScan(env.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
    sessionFactoryBean.setHibernateProperties(hibProperties()); 
    return sessionFactoryBean;
}

Answer 1

在我的情况下，这是因为我没有hibernate packagesToScan属性。我知道你拥有它。可能这个评论对错过它的人有用。

Answer 2

“不，在这个例子中我得到了org.hibernate.hql.internal.ast.QuerySyntaxException：意外令牌：*靠近第1行，第8列[select * from Team] - Sobik Feb 15 at 10:29”

相反“从团队中选择*”尝试写“来自团队”。因为Hibernate适用于java实体。

org.hibernate.hql.internal.ast.QuerySyntaxException：未映射[来自Team]

更新

更新

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更新

2 个答案: