=GenerationType.IDENTITY 自增长 @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="userid...(strategy=GenerationType.IDENTITY) @Column(name="roleid") private Integer roleid; @Column(name="...=GenerationType.IDENTITY 自增长 @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="userid...(strategy=GenerationType.IDENTITY) @Column(name="roleid") private Integer roleid; @Column(name="...(strategy=GenerationType.IDENTITY) @Column(name="roleid") private Integer roleid; @Column(name="
主键配置 @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "cust_id")...private Long custId;//主键 @Id:表示这个注解表示此属性对应数据表中的主键 @GeneratedValue(strategy = GenerationType.IDENTITY...strategy表示此注解使用的策略,可以使用GenerationType.IDENTITY、GenerationType.SEQUENCE、GenerationType.TABLE、GenerationType.AUTO...GenerationType.IDENTITY:底层数据库必须支持自动增长,(类似于mysql的自增) GenerationType.SEQUENCE:底层数据库必须支持序列,(Oracle
示例代码@Entitypublic class Person { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private...示例代码@Entitypublic class Department { @Id @GeneratedValue(strategy = GenerationType.IDENTITY)...(strategy = GenerationType.IDENTITY) private Long id; @ManyToOne @JoinColumn(name = "department_id...示例代码@Entitypublic class Student { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private...(strategy = GenerationType.IDENTITY) private Long id; @ManyToMany(mappedBy = "courses")
(strategy = GenerationType.IDENTITY,generator = "jdbc") private Long uid; private String account...:strategy主键生成策略。...:主键表相关参数配置 */ @Id @GeneratedValue(strategy = GenerationType.TABLE,generator = "userSeq"...:序列化生成主键方式 */ @Id @GeneratedValue(strategy = GenerationType.SEQUENCE,generator = "userSeq...= GenerationType.IDENTITY : 主键自增 mysql 中的 auto_increment */ @Id @GeneratedValue(strategy
(strategy = GenerationType.IDENTITY) private Integer aid; private String province; private...(strategy = GenerationType.IDENTITY) private Integer sid; private String name; @OneToOne(...(strategy = GenerationType.IDENTITY) private Integer aid; private String province; private...(strategy = GenerationType.IDENTITY) private Integer sid; private String name; @OneToOne(...(strategy = GenerationType.IDENTITY) private Integer sid; private String name; @ManyToOne
(strategy = GenerationType.IDENTITY) private int user_id; private String name; private int...(strategy = GenerationType.IDENTITY) private int code_id; private String code; //省略getter...(strategy = GenerationType.IDENTITY) private int uid; private String name; private int age...(strategy = GenerationType.IDENTITY) private int sex_id; private String sex; @OneToMany(...(strategy = GenerationType.IDENTITY) private int uid; private String name; private int age
代码示例懒加载示例@Entitypublic class Department { @Id @GeneratedValue(strategy = GenerationType.IDENTITY...private List employees; // 省略getter和setter}@Entitypublic class Employee { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Long id; @ManyToOne(fetch = FetchType.LAZY)...(strategy = GenerationType.IDENTITY) private Long id; // 其他属性省略 @OneToOne(fetch = FetchType.EAGER...(strategy = GenerationType.IDENTITY) private Long id; // 其他属性省略 // 省略getter和setter}总结选择正确的加载策略对于优化应用性能至关重要
@Entitypublic class One { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long...@Entitypublic class Many { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long...首先,我们创建Author实体类:@Entitypublic class Author { @Id @GeneratedValue(strategy = GenerationType.IDENTITY...private List books; // 构造函数、getter和setter方法}然后,我们创建Book实体类:@Entitypublic class Book { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Long id; private String title; @ManyToOne @JoinColumn
EntityListeners(AuditingEntityListener.class) public class User { /** * 自增主键 */ @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Integer id; /** * 更新时间 */ @LastModifiedDate...(strategy = GenerationType.IDENTITY) private Integer id; /** * 更新时间 */ @LastModifiedDate...Data @MappedSuperclass @NoArgsConstructor @AllArgsConstructor public class BaseEntity { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Integer id; @UpdateTimestamp @Column(nullable
1.1 基本数据类型数组的存储假设我们有一个包含基本数据类型数组的实体类:@Entitypublic class User { @Id @GeneratedValue(strategy =...例如:@Entitypublic class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private...(strategy = GenerationType.IDENTITY) private Long id; private String street; private String...(strategy = GenerationType.IDENTITY) private Long id; private String name; @Convert(converter...3.1 使用JPA和XML我们可以使用JPA并结合JAXB进行XML序列化和反序列化:@Entitypublic class User { @Id @GeneratedValue(strategy
2020/01/03 */ @Entity @Table(name = "teacher") @Getter @Setter public class Teacher { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private int id; @Column(name = "name") private String.../01/03 */ @Entity @Table(name = "student") @Getter @Setter public class Student { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private int id; @Column(name = "name") private...(strategy = GenerationType.IDENTITY) private int id; @ManyToOne(fetch = FetchType.EAGER, cascade
@id和@GeneratedValue都是JPA的标准用法, JPA提供四种标准用法,由@GeneratedValue的源代码可以明显看出....分别介绍其他三个: 1.SEQUENCE 实体类中的注解 @Id @GeneratedValue(strategy =GenerationType.SEQUENCE,generator="aaa"...2.IDENTITY 主键则由数据库自动维护,使用起来很简单 @Id @GeneratedValue(strategy = GenerationType.IDENTITY) 3、AUTO 默认的配置...@Id @GeneratedValue(strategy = GenerationType.AUTO) 二、hibernate主键策略生成器 hibernate提供多种主键生成策略,有点是类似于...", strategy = "identity") 这种完全类似于: @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
(strategy = GenerationType.IDENTITY) private int id; private String name; //省略getter和setter...@GeneratedValue(strategy = GenerationType.IDENTITY):该注解指定了主键的生成策略,一般不单独出现,这里指定了主键自增的策略。 ?...例如: @Entity @Table(name = "userInfo") public class UserInfo { @Id @GeneratedValue(strategy =...使用使用@GeneratedValue指定主键的生成策略,通过它的strategy属性来指定具体的主键生成方案,该属性可以取如下几个值: GenerationType.AUTO:hibernate默认为该值...(strategy = GenerationType.IDENTITY) private int id; private String name; @ElementCollection
首先,我们定义 User 实体类:@Entitypublic class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY...(strategy = GenerationType.IDENTITY) private Long id; private String street; private String...首先,我们定义 Blog 实体类:@Entitypublic class Blog { @Id @GeneratedValue(strategy = GenerationType.IDENTITY...(strategy = GenerationType.IDENTITY) private Long id; private String name; @OneToMany(mappedBy...首先,我们定义 Student 实体类:@Entitypublic class Student { @Id @GeneratedValue(strategy = GenerationType.IDENTITY
spring.jpa.generate-ddl=true spring.jpa.hibernate.ddl-auto=update //自动生成ddl语句 spring.jpa.hibernate.naming_strategy...org.hibernate.cfg.ImprovedNamingStrategy 4 创建实体配置实体 @Entity public class User { // 主键 @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Long id; // 用户名 private String username;...@Id @GeneratedValue(strategy = GenerationType.IDENTITY)声明主键 5 编写UserRepository public interface UserRepository
EntityListeners(AuditingEntityListener.class) public class User { /** * 自增主键 */ @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Integer id; /** * 更新时间 */ @LastModifiedDate...EntityListeners(AuditingEntityListener.class) public class User { /** * 自增主键 */ @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) private Integer id; /** * 更新时间 */ @LastModifiedDate
Index(name = "idx_url", unique = true, columnList = "url"))) open class TechArticle { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) var id: Long = -1 var url = "URL" var title = "Kotlin...com.ak47.cms.cms.entity import java.util.* import javax.persistence.Entity import javax.persistence.GeneratedValue...javax.persistence.GenerationType import javax.persistence.Id @Entity class TechArticleTag { @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) var id: Long = -1 var tagId = -1 // 文章标签:例如 Kotlin,
(strategy = GenerationType.IDENTITY) private Integer id; public Integer getId() {return id;} public...(strategy = GenerationType.IDENTITY) private Integer id; public Integer getId() {return id;} public...(strategy = GenerationType.IDENTITY) private Integer id; public Integer getId() {return id;} public...(strategy = GenerationType.IDENTITY) private Integer id; public Integer getId() {return id;} public...(strategy = GenerationType.IDENTITY) private Integer id; public Integer getId() {return id;} public
twtime;//提问时间 private String title; private Set answer; @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) public Integer getId() { return id; } public...java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue...Date hftime; private User userid;//教师id private Questions question; @Id @GeneratedValue...(strategy = GenerationType.IDENTITY) public Integer getId() { return id; } public
创建任务实体类 Task.java: import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType...; import javax.persistence.Id; @Entity public class Task { @Id @GeneratedValue(strategy = GenerationType.IDENTITY...任务实体类 Task.java: @Entity public class Task { @Id @GeneratedValue(strategy = GenerationType.IDENTITY...(strategy = GenerationType.IDENTITY) private Long id; private String username; private String...(strategy = GenerationType.IDENTITY) private Long id; private String content; private LocalDateTime
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