User
package com.rzy.sbtwebdemo.model;
import javax.persistence.*;
import java.util.Date;
@Entity
@Table(name="t_users")
public class User {
privateint id;
privateString username;
privateString password;
private Date regDate;
privateAddress address;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public int getId() {
return id;
}public void setId(int id) {
this.id = id;
}public String getUsername() {
return username;
}public void setUsername(String username) {
this.username = username;
}public String getPassword() {
return password;
}public void setPassword(String password) {
this.password = password;
}
@Column(name="reg_date")
public Date getRegDate() {
return regDate;
}public void setRegDate(Date regDate) {
this.regDate = regDate;
}@ManyToOne
@JoinColumn(name="address_id")
public Address getAddress() {
return address;
}public void setAddress(Address address) {
this.address = address;
}@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", regData="https://www.it610.com/article/+ regDate +", address=" + address +
'}';
}
}注解
@Entity：表明User是一个实体类，它默认对应数据库中的表名是user，你也可以指定@Entity(name = "t_users")，或者@Table(name="t_users")
@Id注释指定表的主键， @GeneratedValue(strategy = GenerationType.IDENTITY)自增长主键生成策略
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column注释定义了将成员属性映射到关系表中的哪一列和该列的结构信息，如@Column(name="reg_date")，将实体类regDate对应数据库中的reg_date。
@Column(name="reg_date")
@ManyToOne：多（User)对一(Address) @JoinColumn(name=“address_id”)：指定Address主键
@ManyToOne
@JoinColumn(name="address_id")
Address
package com.rzy.sbtwebdemo.model;
import javax.persistence.*;
@Entity
@Table(name="t_address")
public class Address {
private int id;
private String addressInfo;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public int getId() {
return id;
}public void setId(int id) {
this.id = id;
}
@Column(name="address_info")
public String getAddressInfo() {
return addressInfo;
}public void setAddressInfo(String addressInfo) {
this.addressInfo = addressInfo;
}@Override
public String toString() {
return "Address{" +
"id=" + id +
", addressInfo='" + addressInfo + '\'' +
'}';
}
}【Spring|springboot实体类注解】标记为实体类，指定其对应表t_address
@Entity
@Table(name="t_address")
标记为主键，指定为自增长主键生成策略
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
将addrss中的addressInfo对应与表address_info
@Column(name="address_info")
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