Question

我的项目有问题。当我浏览http://localhost:8080/user/form以在直接http://localhost:8080/user/list之后填写用户信息以显示列表用户时，会出现以下错误：

Hibernate：插入userdat（密码，生日，年龄，性别，用户名）值s（？，？，？，？，？）2016年3月25日上午5:05:04 org.hibernate.engine.jdbc.spi.SqlExceptionHelper $ STANDAR dWarningHandler logWarning WARN：SQL警告代码：10000，SQLState： 01J01 2016年3月25日上午5:05:04 org.hibernate.engine.jdbc.spi.SqlExceptionHelper $ STANDAR dWarningHandler logWarning警告：数据库'D：\ PROJECTSPRING \ userdb' 没有创建，连接使得存在于数据库中。 3月25日， 2016年5:05:04 AM org.hibernate.hql.internal.QueryTranslatorFactoryInitiat或 initiateService INFO：HHH000397：使用ASTQueryTranslatorFactory Hibernate：选择user0_.username作为username1_0_，user0_.password as password2_ 0_，user0_.birthday as birthday3_0_，user0_.age as age4_0_， user0_.gender as gen der5_0_ from userdat user0_ Mar 25,2016 5:05:04 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExce ptions 警告：SQL错误：20000，SQLState：22005 2016年3月25日上午5:05:04 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExce ptions ERROR：尝试从数据中获取类型为'byte []'的数据值 'VARCHAR'类型的值。 [警告] org.springframework.web.util.NestedServletException：Request 处理失败;嵌套异常是 org.hibernate.exception.DataException：无法执行que ry 在org.springframework.web.servlet.FrameworkServlet.processRequest（Frame workServlet.java:973）在org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServl） et.java:852）在javax.servlet.http.HttpServlet.service（HttpServlet.java:687）在org.springframework.web.servlet.FrameworkServlet.service（FrameworkSer

此处归档CustomContextLoaderListener.java

public class CustomContextLoaderListener extends ContextLoaderListener{

    @Override
    public void contextDestroyed(ServletContextEvent event) {
        // TODO Auto-generated method stub
        System.out.println("hibernate shutdown database");
        try {
            DriverManager.getConnection("jdbc:derby:D:/PROJECTSPRING/userdb;shutdown=true");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("\n Spring-MVC application destroyed \n");
        super.contextDestroyed(event);

    }

    @Override
    public void contextInitialized(ServletContextEvent event) {
        // TODO Auto-generated method stub
        System.out.println("\n Spring-MVC application inited \n");
        try {
            createTable();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        super.contextInitialized(event);
    }

    public void createTable() throws SQLException{
        try {
            Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
            Connection connection = DriverManager.getConnection("jdbc:derby:D:/PROJECTSPRING/userdb;create=true");
            createTableNotExist(connection,"userdat", "create table userdat"
                    + "(username varchar(1000) primary key,"
                    + "password varchar(1000),birthday date,"
                    + "age integer,gender varchar(100))");
//          createTableNotExist(connection,"subject","create table subject"
//                  + "(id bigint primary key generated always as identity(start with 1,increment by 1),"
//                  + "title varchar(1000),student integer,score integer)" );
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
    public void createTableNotExist(Connection connection,
            String tableName,String createTableSQL) throws SQLException{
        DatabaseMetaData dbmd = connection.getMetaData();
        ResultSet rs = dbmd.getTables(null, null,tableName.toUpperCase(), null);
        if (rs.next()){
            System.out.println("Table" + rs.getString("TABLE_NAME") + "already exists");
            return;

        }
        System.out.println("anh yeu em");
        Statement statement = connection.createStatement();
        statement.execute(createTableSQL);
        System.out.println("\n\n executed" + createTableSQL + "\n\n");
        statement.close();
    }


}

此处归档UserRestServiceController.java

@Controller
public class UserRestServiceController {
    @Autowired
    private UserDao userDao;
    @Autowired
    private View jsonView;
    @RequestMapping(value="/user/form",method = RequestMethod.GET)
    public ModelAndView user() {
//      System.out.println("anh yeu em ");
        ModelAndView model = new ModelAndView("UserForm", "User", new User());

        model.addObject("allgender", Gender.values());

        return model;
    }

    @RequestMapping(value="/user/save", method = RequestMethod.POST)
    public ModelAndView saveUser(@ModelAttribute("User") User user,BindingResult result){

        ModelAndView model = new ModelAndView();
        System.out.println("anh yeu em ");
        if (result.hasErrors()){
            model = new ModelAndView("UserForm","User",user);
            model.addObject("errors",result);
            return model;
        }
        userDao.save(user);
        model = new ModelAndView("redirect:/user/list");
        return model;

    }

    @RequestMapping(value="/user/list",method = RequestMethod.GET)
    public ModelAndView listUser(){
        ModelAndView model = new ModelAndView();
        List<User> listUser = userDao.listUsers();
        model = new ModelAndView("UserList","Users",listUser);
        return model;
    }
    @RequestMapping(value="/user/json/{username}")
    public ModelAndView loadUser(@PathVariable("username")String name){
        return new ModelAndView(jsonView,"data",userDao.loadUser(name));
    }
    @InitBinder
    public void initBinder(WebDataBinder binder) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

        binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));

    }


}

此处归档UserDaoImpl.java

@Repository
public class UserDaoImpl implements UserDao{
    @Autowired
    public LocalSessionFactoryBean sessionFactory;


    @Override
    public void save(User user) {
        // TODO Auto-generated method stub
        Session session = sessionFactory.getObject().openSession();
        session.save(user);
        session.flush();
        session.close();

    }

    @Override
    public void update(User user) {
        // TODO Auto-generated method stub

    }

    @Override
    public List<User> listUsers() {
        // TODO Auto-generated method stub
        Session session = sessionFactory.getObject().openSession();
        Query query = session.createQuery("from User");
        return (List<User>)query.list();
    }

    @Override
    public void delete(User user) {
        // TODO Auto-generated method stub
        Session session = sessionFactory.getObject().openSession();
        session.delete(user);

    }

    @Override
    public User loadUser(String username) {
        // TODO Auto-generated method stub
        Session session = sessionFactory.getObject().openSession();
        Query query = session.createQuery("from User "
                + "where username = :user_name");
        query.setParameter("user_name",username);
        return (User) query.uniqueResult();
    }


}

此处归档User.java

@Entity
//@Table(name = "user",uniqueConstraints={@UniqueConstraint(columnNames="username")})
public class User {
//  @Column(name = "gender", nullable = false)
//  @Enumerated(EnumType.STRING)
    public Gender getGender() {
        return gender;
    }
    public void setGender(Gender gender) {
        this.gender = gender;
    }
//  @Id
//  @GeneratedValue(strategy = GenerationType.IDENTITY)
//  @Column(name = "username", unique = true, nullable = false)
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
//  @Column(name = "password", nullable = false)
    public String getPassWord() {
        return passWord;
    }
    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
//  @Column(name = "birthday", nullable = false)
    public Date getBirthDay() {
        return birthDay;
    }

    public void setBirthDay(Date birthDay) {
        this.birthDay = birthDay;
    }
//  @Column(name="age", nullable = false)
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    private String userName;
    private String passWord;
    private Date birthDay;
    private Integer age;
    private Gender gender;


}

此处提交Gender.java文件

public enum Gender {
    MALE("Male"),
    FEMALE("Female"),
    OTHER("Other");
    private String name;

    private Gender(String name) {
        this.name = name;
    }

    public String getGender(){
        return this.name;
    }

此处归档User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="edu.java.spring.service.user.model.User" table="userdat">
        <id name="userName" column="username"/>
        <property name="passWord" column="password"/>
        <property name="birthDay"  column="birthday"/>
        <property name="age"  column="age"/>
        <property name="gender" column="gender" />

    </class>
</hibernate-mapping>

Answer 1

当您使用Hibernate编写select语句时，您可以在HQL中编写它，但不能在SQL中编写。它们之间的主要区别之一是，在HQL中，您编写类名和字段名，在sql中您将使用表名和列名。

您的实体的类名可能是User，而表名是userdat。因此，正确的HQL语句将是：from User（大写U！）而不是from userdat

@Override
public List<User> listUsers() {
    // TODO Auto-generated method stub
    Session session = sessionFactory.getObject().openSession();
    Query query = session.createQuery("from User");
    return (List<User>)query.list();
}

顺便说一下public User loadUser(String username)

是一样的

根据您修改过的问题 （顺便说一下。如果此修改改变了问题的性质，下次再提出新问题而不是更改旧问题）

首先让我说，我想知道现在有人仍然使用hbm.xml文件而不是注释，但也许你有一些很好的理由。 ...

当我将hbm.xml与（注释掉的）注释进行比较时，只有一件事可能会导致像你一样的问题：它是枚举。在注释中，枚举通过其名称（字符串/ varchar）进行映射，但在hbm.xml中，它通过其序数（整数）进行映射。所以试试吧。检查用于枚举的列是否为整数列，如果不是则为1。如果您可以/不想更改列类型，则需要更改映射。根据谷歌的一些研究，通过xml通过名称映射枚举很奇怪:(重要的是12，它是varchar的内部表示！）

<property name="gender" length="30">
   <type name="org.hibernate.type.EnumType">
      <param name="enumClass">full.qualifiey.name.for.Gender</param>
      <param name="type">12</param>
   </type>
</property>

Answer 2

您需要将表userdat映射到User实体才能进行HQL查询。一旦你映射了它，你就可以做

Query query = session.createQuery("from User");

查看this示例和关于mappings的Hibernate文档部分。

错误：org.hibernate.hql.internal.ast.QuerySyntaxException，帮帮我？

2 个答案: