hibernate-annotations

问题 guys ! i have very strange problem with hibernate 5. I receive Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.rosko.Merchandiser When i remove configuration.addAnnotatedClass(com.rosko.Merchandiser.class) HibernateUtil.java public class HibernateUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); private static SessionFactory buildSessionFactory() { try { Configuration configuration = new Configuration(); configuration.configure()

问题 I have 3 Entity USER, APPLICATION, and ROLE . I want there IDs to be joined in a table named USER_APP_ROLE(user_ID, application_ID, role_ID) with many to many relationship between them. Reason I want this structure is- I have requirement of allowing the user to work on multiple application with multiple roles. I have done the following codes: User.java @ManyToMany (targetEntity=Role.class) @JoinTable(name="USER_APPLICATION_ROLE", joinColumns=@JoinColumn(name="USER_ID"), inverseJoinColumns=

问题 Please help me figure this out. I've tried so many combinations but nothing seems to work. I'm trying to implement hibernate mapping using annotations but during the saving of my parent object and its children i noticed that an update statement is being called instead of an insert statement. I have two classes which have a one-to-many relationship with each other. These are the class' mappings: Receipt has one-to-many Collections @Entity public class Receipt implements Serializable { @Id

问题 I am trying to configure springs3 for Hibernate3 annotations. I am getting following error. I dubugged my application. its giving this exception while creating User object in getData(). Exception: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java

问题 I have two tables and related Java mapping. CREATE TABLE country ( code VARCHAR(3) PRIMARY KEY NOT NULL, name VARCHAR(100) NOT NULL ); CREATE TABLE user ( id INT PRIMARY KEY NOT NULL AUTO_INCREMENT, name VARCHAR(100) NOT NULL, country_code VARCHAR(3), FOREIGN KEY ( country_code ) REFERENCES country ( code ) ); Here is my Java entities. Country POJO: @Entity @Table(name = "country") public class Country { @Id @Column (name = "code") private String code; @Column (name = "name") private String

问题 I have a boolean property in my entity. Here's my annotations for it: @Column(name = "IS_ACTIVE", nullable = false, columnDefinition="BIT DEFAULT 1", length = 1) public Boolean getActive() { return isActive; } But columnDefinition="BIT DEFAULT 1" doen't work perfectly. Here's SQL code I get as result for generated table: IS_ACTIVE BIT(1) NOT NULL, What am I doing wrong? And so when I try to save an instance of this class to the database I get the exception: `com.mysql.jdbc.exceptions.jdbc4

问题 It seems that org.hibernate.cfg.Configuration object can be used to perform validation programmatically, by calling the validateSchema method. However, this method needs dialect and databaseMetadata objects. I am using Spring and I can get a hold of AnnotationSessionFactoryBean object from spring context. So far I have the following code: AnnotationSessionFactoryBean factory = null; factory = (AnnotationSessionFactoryBean) context.getBean("AnnotationSessionFactory"); Configuration

问题 I have a problem that Hibernate is unable to determine the type for Set at the table USERS. I am trying to create a foreign key of table INVOICES through one-to-many relationship. One User can generate many Invoices. My User.java is given below. @Entity @Table(name="USERS") public class User { @Id @Column(name="User_Id",nullable=false) @GeneratedValue(strategy=GenerationType.AUTO) private Integer user_id; @Column(name="NAME") private String name; @Column(name="Address") private String address

问题 I have a problem that Hibernate is unable to determine the type for Set at the table USERS. I am trying to create a foreign key of table INVOICES through one-to-many relationship. One User can generate many Invoices. My User.java is given below. @Entity @Table(name="USERS") public class User { @Id @Column(name="User_Id",nullable=false) @GeneratedValue(strategy=GenerationType.AUTO) private Integer user_id; @Column(name="NAME") private String name; @Column(name="Address") private String address

问题 What is difference between @UniqueConstraint and @Column(unique = true) ? For example: @Table( name = "product_serial_group_mask", uniqueConstraints = {@UniqueConstraint(columnNames = {"mask", "group"})} ) And @Column(unique = true) @ManyToOne(optional = false, fetch = FetchType.EAGER) private ProductSerialMask mask; @Column(unique = true) @ManyToOne(optional = false, fetch = FetchType.EAGER) private Group group; 回答1: As said before, @Column(unique = true) is a shortcut to UniqueConstraint