一，pom.xml配置

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

二，建立实体(包含一对多和多对一)

Car.java

package com.packt.cardatabase.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.FetchType;

@Entity
public class Car {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long id;
    private String brand, model, color, registerNumber;
    private int year, price;
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "owner")
    private Owner owner;

    public Car() {
    }

    public Car(String brand, String model, String color, String registerNumber, int year, int price, Owner owner) {
        super();
        this.brand = brand;
        this.model = model;
        this.color = color;
        this.registerNumber = registerNumber;
        this.year = year;
        this.price = price;
        this.owner = owner;
    }

    public String getBrand() {
        return brand;
    }

    public String getModel() {
        return model;
    }

    public String getColor() {
        return color;
    }

    public String getRegisterNumber() {
        return registerNumber;
    }

    public int getYear() {
        return year;
    }

    public int getPrice() {
        return price;
    }

    public Owner getOwner() {
        return owner;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public void setRegisterNumber(String registerNumber) {
        this.registerNumber = registerNumber;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public void setOwner(Owner owner) {
        this.owner = owner;
    }
}

Owner.java

package com.packt.cardatabase.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.CascadeType;


import java.util.List;

@Entity
public class Owner {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long ownerId;
    private String firstname, lastname;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "owner")
    private List<Car> cars;

    public Owner() {
    }

    public Owner(String firstname, String lastname) {
        super();
        this.firstname = firstname;
        this.lastname = lastname;
    }

    public long getOwnerId() {
        return ownerId;
    }

    public String getFirstname() {
        return firstname;
    }

    public String getLastname() {
        return lastname;
    }

    public List<Car> getCars() {
        return cars;
    }

    public void setOwnerId(long ownerId) {
        this.ownerId = ownerId;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

    public void setCars(List<Car> cars) {
        this.cars = cars;
    }
}

三，建立repository接口

CarRepository.java

package com.packt.cardatabase.domain;
import org.springframework.data.repository.CrudRepository;

public interface CarRepository extends CrudRepository <Car, Long> {
}

OwnerRepository.java

package com.packt.cardatabase.domain;
import org.springframework.data.repository.CrudRepository;

public interface OwnerRepository extends CrudRepository<Owner, Long>{
}

四，application.properties配置

logging.level.root=INFO
server.port=8080

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/cardb?serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=password
spring.jpa.generate-ddl=true

spring.jpa.properties.hibernate.hbm2ddl.auto=create-drop
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true