: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...= GenerationType.AUTO : 主键生成策略交给持久化引擎自动处理, * 持久化引擎会根据数据库在以上三种生成策略中任选一个 */ @Id @GeneratedValue...(strategy =GenerationType.AUTO ) private Long uid; (3)、集成tkMybatis的Mapper接口 import com.cloud.user.entity.UserInfo
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.SEQUENCE:底层数据库必须支持序列,(Oracle) GenerationType.TABLE:jpa提供的一种机制,通过一张数据表的形式帮助完成主键自增 GenerationType.AUTO
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...比如说,JPA标准用法 @Id @GeneratedValue(GenerationType.AUTO) 就可以用hibernate特有以下用法来代替: @Id @GeneratedValue(...", strategy = "identity") 这种完全类似于: @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
(strategy = GenerationType.AUTO) private int id; private String name; private String password; public...(strategy=GenerationType.AUTO) private int id; private String name; @OneToMany(cascade=CascadeType.ALL...(strategy = GenerationType.AUTO) private int id; private String name; // 若有多个cascade,可以是:{CascadeType.PERSIST...(strategy = GenerationType.AUTO) private int id; private String name; private String password; @...(strategy = GenerationType.AUTO) private int id; private String name; @ManyToMany(mappedBy = "roles
设定的.这里的@id和@GeneratedValue都是JPA的标准用法。...具体说明如下: IDENTITY:主键由数据库自动生成(主要是自动增长型) 用法: @Id @GeneratedValue(strategy = GenerationType.IDENTITY...用法: @Id @GeneratedValue(strategy = GenerationType.SEQUENCE,generator="payablemoney_seq")...(strategy = GenerationType.AUTO) private Long custId; TABLE:使用一个特定的数据库表格来保存主键 用法: @Id...@GeneratedValue(strategy = GenerationType.TABLE, generator="payablemoney_gen") @TableGenerator(
implements Serializable { private static final long serialVersionUID = -5648617800765002770L; @Id @GeneratedValue...(strategy = GenerationType.AUTO, generator = "jpa-uuid") @GenericGenerator(name = "jpa-uuid", strategy...(strategy = GenerationType.AUTO, generator = "jpa-uuid") @GenericGenerator(name = "jpa-uuid", strategy...(strategy = GenerationType.AUTO, generator = "jpa-uuid") @GenericGenerator(name = "jpa-uuid", strategy...(strategy = GenerationType.AUTO, generator = "jpa-uuid") @GenericGenerator(name = "jpa-uuid", strategy
indexes = arrayOf(Index(name = "idx_category", columnList = "category"))) class Tree { @Id @GeneratedValue...(strategy = GenerationType.AUTO) var id: Long = 0 var parentId: Long = 0 @Column(length...* * @see GeneratedValue * * @since Java Persistence 1.0 */ public enum GenerationType { /*...IDENTITY, /** * Indicates that the persistence provider should pick an * appropriate strategy...The * AUTO generation strategy may expect a database * resource to exist, or it
= :id", name = "find employee by id") import javax.persistence.Entity; import javax.persistence.GeneratedValue...Employee e where e.eid = :id", name = "find employee by id") public class Employee { @Id @GeneratedValue...(strategy= GenerationType.AUTO) private int eid; private String ename; private double salary
return "test"; } } 此时访问 添加描述 403错误 高阶: 使用数据库保存用户名和密码 用户表 @Entity class User { @Id @GeneratedValue...(strategy = GenerationType.AUTO) @BeanProperty var id: Integer = _ @BeanProperty var userName...: String = _ @BeanProperty var password: String = _ } 角色表 ··· @Entity class Role { @Id @GeneratedValue...(strategy = GenerationType.AUTO) @BeanProperty var id: Integer = _ @BeanProperty var role: String = _...} ··· 用户角色表 @Entity class UserRole { @Id @GeneratedValue(strategy = GenerationType.AUTO) @BeanProperty
用于表示该属性作为ID主键 @GeneratedValue 主键生成策略,@GeneratedValue(strategy=GenerationType.AUTO)表示主键自增长由实现jpa的框架来控制...@Id @Id设置对象表示符,标识的实体类的属性映射对应表中的主键 @GeneratedValue 设置标识符的生成策略,常与@Id一起使用 参数:strategy指定具体的生成策略 方式一:@...GeneratedValue(strategy=GenerationType.AUTO) 也是默认策略, 即写成@GeneratedValue也可; 类似于hibernate的native策略,生成方式取决于底层的数据库...方式二:@GeneratedValue(strategy = GenerationType.IDENTITY)指定“自动增长”策略,适用于MySQL; 方式三:@GeneratedValue(strategy
indexes = arrayOf(Index(name = "idx_category", columnList = "category"))) class Tree { @Id @GeneratedValue...(strategy = GenerationType.AUTO, generator = "custom-uuid") @GenericGenerator(name = "custom-uuid...", strategy = "com.ak47.cms.cms.tree.CustomUUIDGenerator") var id: Long = 0 var parentId: Long...name = "idx_category", columnList = "category"))) class Tree { @Id @Column(length = 100) @GeneratedValue...(strategy = GenerationType.AUTO, generator = "custom-uuid") @GenericGenerator(name = "custom-uuid
UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 实体类 Book @Entity public class Book { @Id @GeneratedValue...(strategy = GenerationType.AUTO) private int id; private String name; @ManyToOne @JoinColumn...} } BookCategory @Entity @Table(name = "book_category") public class BookCategory { @Id @GeneratedValue...(strategy = GenerationType.AUTO) private int id; private String name; @OneToMany(mappedBy...该属性值可以通过应该自身创建,但是Hibernate推荐通过Hibernate生成 @GeneratedValue 指定主键的生成策略。
DEFAULT CHARSET=utf8; 实体类 Book @Entity @Data @Table(name = "book") public class Book { @Id @GeneratedValue...(strategy = GenerationType.AUTO) @Column(name = "id") private int id; @Column(name = "name...} } BookDetail @Entity @Table(name = "book_detail") @Data public class BookDetail { @Id @GeneratedValue...(strategy = GenerationType.AUTO) @Column(name = "id") private Integer id; @Column(name =...该属性值可以通过应该自身创建,但是Hibernate推荐通过Hibernate生成 @GeneratedValue 指定主键的生成策略。
新建用户 User @Data @Entity public class User implements Serializable { @Id @GeneratedValue(strategy...(strategy=GenerationType.AUTO) private Long id; @Column(unique =true) private String roleCode...(strategy=GenerationType.AUTO) private Long id; @Column(unique =true) private String permCode...(strategy=GenerationType.AUTO) private Long id; private Long userId; private Long roleId...; } 建立角色与权限关系 @Data @Entity public class RolePermRel { @Id @GeneratedValue(strategy=GenerationType.AUTO
com.mysql.jdbc.Driver创建实体类创建一个实体类,并使用注解来映射数据库表和字段:@Entity@Table(name = "users")public class User { @Id @GeneratedValue...(strategy = GenerationType.AUTO) private Long id; @Column(nullable = false) private String username
model类如下: @Entity @Table(name = "customer") data class Customer ( @Id @GeneratedValue(strategy...= GenerationType.AUTO) var id: Int?...这样我们写model类就不需要主动实现空构造了,编译器会帮我们实现 @Entity @Table(name = "customer") data class Customer ( @Id @GeneratedValue...(strategy = GenerationType.AUTO) var id: Int?
新建model package com.example.demo.model; import javax.persistence.Entity; import javax.persistence.GeneratedValue...javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class User { @Id @GeneratedValue...(strategy= GenerationType.AUTO) int id; public int getId() { return id; } public
映射生成主键 @Version 定义乐观锁 @Column 映射表的列 @Transient 定义暂态属性 主键相关的注解 @id: 指定该属性为主键 @GeneratedValue...(strategy=,generator="") : 主键生成策略 Strategy的值 GenerationType.AUTO - 根据底层数据库自动选择(默认),若数据库支持自动增长类型,则为自动增长...java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue...String getWife() { return wife; } public void setWife(String wife) { this.wife = wife; } @Id @GeneratedValue...(strategy=GenerationType.AUTO) //设置主键自增长 public int getId() { return id; } @Temporal(TemporalType.DATE
UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 实体类 Book @Entity public class Book{ @Id @GeneratedValue...(strategy = GenerationType.AUTO) private int id; private String name; @OneToMany(mappedBy...this.bookPublishers = bookPublishers; } } Publisher @Entity public class Publisher { @Id @GeneratedValue...(strategy = GenerationType.AUTO) private int id; private String name; @OneToMany(mappedBy...该属性值可以通过应该自身创建,但是Hibernate推荐通过Hibernate生成 @GeneratedValue 指定主键的生成策略。
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