Question

我尝试在实例条件中获取元素列表。在执行中我获得了这个例外。有什么问题？

我的数据库名称是“TransPlusBD”。我的桌子名称是“gerant”。但错误表明他（他）没有找到表“TransPlusDB.gerant_gerant”，但该表不存在。通常我们必须拥有他的“TransPlusDB.gerant”。

配置代码

    properties = new Properties();
    properties.put("hibernate.dialect","org.hibernate.dialect.MySQLInnoDBDialect");
    properties.put("hibernate.connection.driver_class","com.mysql.jdbc.Driver");
    properties.put("hibernate.connection.url","jdbc:mysql://(cloud amazone aws).amazonaws.com:3306/TransPlusDB");
    properties.put("hibernate.connection.username","xxx");
    properties.put("hibernate.connection.password","xxxxxxxxxxxx");
    properties.put("hibernate.connection.pool_size","4");
    configuration =  new Configuration();
    configuration.setProperties(properties);

    configuration.addAnnotatedClass(Administrator.class);
    configuration.addAnnotatedClass(AutoGare.class);
    configuration.addAnnotatedClass(Car.class);
    configuration.addAnnotatedClass(City.class);
    configuration.addAnnotatedClass(Company.class);
    configuration.addAnnotatedClass(transplus.models.Configuration.class);
    configuration.addAnnotatedClass(DateDeparture.class);
    configuration.addAnnotatedClass(Departure.class);
    configuration.addAnnotatedClass(HoursDeparture.class);
    configuration.addAnnotatedClass(Luggage.class);
    configuration.addAnnotatedClass(Manager.class);
    configuration.addAnnotatedClass(Passenger.class);
    configuration.addAnnotatedClass(PlanningVoyage.class);
    configuration.addAnnotatedClass(Route.class);
    configuration.addAnnotatedClass(Stopover.class);
    configuration.addAnnotatedClass(SysAdmin.class);
    configuration.addAnnotatedClass(Ticket.class);
    configuration.addAnnotatedClass(TypeCar.class);

    configuration.addAnnotatedClass(ModificationLuggage.class);
    configuration.addAnnotatedClass(ModificationTicket.class);
    configuration.addAnnotatedClass(PassageRoute.class);

    ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
            .applySettings(configuration.getProperties()).build();

我班级的代码

@Entity
@Table(name = "gerant")
public class Manager implements Serializable // Table Gerant
{
   @Id
   @GeneratedValue
   @Column(name = "code_gerant")
   private long code_manager;

  @Column(name = "matricule_gérant",unique = true)
  private String matricule_manager;
  @Column(name = "nom_gerant")
  private String lastName_manager;
  @Column(name = "prenom_gerant")
  private String firstName_manager;
  @Column(name = "password_gerant",nullable = false)
  private String password_manager;
  @Column(name = "login_gerant",unique = true,nullable = false)
  private String login_manager;
  @Column(name = "poste_gerant")
  private String function_manager;
  @Column(name = "actif_gerant")
  private boolean enabled_manager;

  @Enumerated(EnumType.ORDINAL)
  @Column(name = "privilege_gerant")
  private Privilege privilege;

  @ManyToOne
  @JoinColumn(name = "code_manager", foreignKey = @ForeignKey(name = "fk_gerant_manager"))
private Administrator administrator;

@ManyToOne
@JoinColumn(name = "over_gerant", foreignKey = @ForeignKey(name = "fk_over_gerant"))
private Manager overManager;

@Expose   // Annotation for Gson
@OneToMany(cascade = CascadeType.ALL,orphanRemoval = false)
private List<Manager> underManagers = new ArrayList<>();

恢复清单的代码。

public String getAllManager()
{

    if(session.isOpen())
    {
        Transaction transaction = null;
        try
        {
            transaction = session.beginTransaction();
            transaction.begin();
            Criteria criteria = session.createCriteria(Manager.class);
            List list = criteria.list();
            transaction.commit();
            if(list != null)
            {
                if(!list.isEmpty())
                    return serializeTab(list);
            }
            return null;
        }
        catch (Exception e)
        {
            if(transaction != null)
                transaction.rollback();
            e.printStackTrace();
        }
    }
    return null;
}

以下是引发的异常

    this = {ServiceManager@3681} 
transaction = {TransactionImpl@3683} 
transactionCoordinator = {JdbcResourceLocalTransactionCoordinatorImpl@3979} 
transactionDriverControl = {JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl@3980} 
valid = false
e = {SQLGrammarException@3954} "org.hibernate.exception.SQLGrammarException: could not extract ResultSet"
    sqlException = {MySQLSyntaxErrorException@3958} "com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'TransPlusDB.gerant_gerant' doesn't exist"
    SQLState = "42S02"
    vendorCode = 1146
    next = null
    detailMessage = "Table 'TransPlusDB.gerant_gerant' doesn't exist"
    cause = {MySQLSyntaxErrorException@3958} "com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'TransPlusDB.gerant_gerant' doesn't exist"
    stackTrace = {StackTraceElement[0]@3961} 
    suppressedExceptions = {Collections$UnmodifiableRandomAccessList@3962}  size = 0
    sql = "n/a"

帮助我请

Answer 1

表var filteredBindingList = new BindingList<StudentGrade>( _studentGrade.Where(x => x.StudentID == studentID).ToList()); dgvGrades.DataSource = filteredBindingList;是此

的自关联的连接表

gerant_gerant

您需要让Hibernate使用@OneToMany(cascade = CascadeType.ALL,orphanRemoval = false) private List<Manager> underManagers = new ArrayList<>();属性创建此表，或者您可以使用约束（外键，唯一键）手动创建它。

您可以使用hibernate.hbm2ddl.auto注释指定连接表名称。

Answer 2

我在配置级别添加了这行代码

        properties.put("hbm2ddl.auto","validate");

然后这个代码在我的班级

@OneToMany(cascade = CascadeType.ALL,orphanRemoval = false,mappedBy = "overManager")
private List<Manager> underManager;

感谢

Hibernate错误SQLGrammarException（MySQL）

2 个答案: