spring-bucks-demo

时间:2020-07-11
本文章向大家介绍spring-bucks-demo,主要包括spring-bucks-demo使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。

very happy main

package com.example.springbucksdemo;

import com.example.springbucksdemo.model.Coffee;
import com.example.springbucksdemo.model.CoffeeOrder;
import com.example.springbucksdemo.model.OrderState;
import com.example.springbucksdemo.repository.CoffeeOrderRepository;
import com.example.springbucksdemo.repository.CoffeeRepository;
import org.joda.money.CurrencyUnit;
import org.joda.money.Money;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.Transactional;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

/**
 * lesson 18
 * Repository
 * @EnableJpaRepositories (帮我自动发现CurdRepository等这样的接口的扩展)
 *
 * 定义查询
 * 根据方法名定义查询
 * find...By... / read...By... / query...By / get...By...
 * count...By...
 * ...OrderBy... [Asc / Desc]
 * And / Or / IgnoreCase
 * Top / First / Distinct
 *
 * 分页查询
 * PagingAndSortingRepository<T,ID>
 *   Pageable/Sort
 *   Slice<T>/Page<T>
 *
 *
 */
@SpringBootApplication
@EnableJpaRepositories
@EnableTransactionManagement
public class SpringBucksDemoApplication implements ApplicationRunner {

    @Autowired
    private CoffeeRepository coffeeRepository;
    @Autowired
    private CoffeeOrderRepository orderRepository;

    public static void main(String[] args) {
        SpringApplication.run(SpringBucksDemoApplication.class, args);
    }

    @Override
    @Transactional
    public void run(ApplicationArguments args) throws Exception {
        initOrders();
        findOrders();
    }

    private void initOrders(){
        Coffee latte = Coffee.builder().name("latte")
                .price(Money.of(CurrencyUnit.of("CNY"), 30.0)).build();
        Coffee save = coffeeRepository.save(latte);
        if(save!=null){
            System.out.println("Coffee:"+latte);
        }else{
            System.out.println("Coffee not saved");
        }

        Coffee espresso = Coffee.builder()
                .name("espresso")
                .price(Money.of(CurrencyUnit.of("CNY"), 20.0))
                .build();
        Coffee save1 = coffeeRepository.save(espresso);
        if(save1!=null){
            System.out.println("Coffee:"+espresso);
        }else{
            System.out.println("Coffee not saved");
        }

        CoffeeOrder order = CoffeeOrder.builder()
                .customer("ZhangQi")
                .items(Collections.singletonList(espresso))
                .state(OrderState.INIT)
                .build();
        CoffeeOrder orderSave = orderRepository.save(order);
        System.out.println("Order:"+order);

        order = CoffeeOrder.builder()
                .customer("JunJun")
                .items(Arrays.asList(espresso, latte))
                .state(OrderState.INIT)
                .build();
        orderRepository.save(order);
        System.out.println("Order1:"+order);
    }

    private void findOrders(){
        coffeeRepository
                .findAll(Sort.by(Sort.Direction.DESC, "id"))
                .forEach(c-> System.out.println("Loading"+c));
        List<CoffeeOrder> list = orderRepository.findTop3ByOrderByUpdateTimeDescIdAsc();
        System.out.println("findTop3ByOrder..."+getJoinedOrderId(list));

        list = orderRepository.findByCustomerOrderById("ZhangQi");
        System.out.println("findByCustomerOrder.ZQ.."+getJoinedOrderId(list));
        list = orderRepository.findByCustomerOrderById("JunJun");
        System.out.println("findByCustomerOrder.JunJun.."+getJoinedOrderId(list));

        list.forEach(o->{
            System.out.println("Order:"+o.getId());
            o.getItems().forEach(i-> System.out.println("Item:"+i));
        });

        list = orderRepository.findByItems_Name("latte");
        System.out.println("findByItems.Name:"+getJoinedOrderId(list));
    }

    /**
     * 转换list获取id加入join形成1,2,3
     * @param list
     * @return
     */
    private String getJoinedOrderId(List<CoffeeOrder> list){
        return list.stream().map(o->o.getId().toString())
                .collect(Collectors.joining(","));
    }
}

model
BaseEntity

package com.example.springbucksdemo.model;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;

import javax.persistence.*;
import	java.io.Serializable;
import java.util.Date;

/**
 * 被继承的共有属性字段
 */
@MappedSuperclass
@Data
@NoArgsConstructor
@AllArgsConstructor
public class BaseEntity implements Serializable{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    //@GeneratedValue注解存在的意义主要就是为一个实体生成一个唯一标识的主键、@GeneratedValue提供了主键的生成策略。
    // @GeneratedValue注解有两个属性,分别是strategy和generator
    //AUTO主键由程序控制,是默认选项 ,不设置就是这个
    //IDENTITY 主键由数据库生成, 采用数据库自增长, Oracle不支持这种方式
    //SEQUENCE 通过数据库的序列产生主键, MYSQL  不支持
    //Table 提供特定的数据库产生主键, 该方式更有利于数据库的移植
    //generator
    //generator属性的值是一个字符串,默认为"",其声明了主键生成器的名称
    //(对应于同名的主键生成器@SequenceGenerator和@TableGenerator)
    private Long id;
    @Column(updatable = false)
    @CreationTimestamp
    private Date createTime;
    @UpdateTimestamp
    private Date updateTime;
}

Coffee

package com.example.springbucksdemo.model;

import lombok.*;
import org.hibernate.annotations.Type;
import org.joda.money.Money;

import javax.persistence.Entity;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Date;

/**
 * 不使用Lombok了,破坏封装性,如果有的不需要get,set的情况下
 */
@Entity
@Data
@Builder
@ToString(callSuper = true)
@NoArgsConstructor
@AllArgsConstructor
@Table(name="T_MENU")
public class Coffee extends BaseEntity implements Serializable {

    private String name;
    /**
     * 做映射,指定CNY人民币
     * PersistentMoneyAmount是bigdecimal(19,2)
     * PersistentMoneyMinorAmount是bigint Long
     */
//    @Type(type = "org.jadira.usertype.moneyandcurrency.joda.PersistentMoneyAmount",
    @Type(type = "org.jadira.usertype.moneyandcurrency.joda.PersistentMoneyMinorAmount",
    parameters = {@org.hibernate.annotations.Parameter(name="currencyCode",value = "CNY")})
    private Money price;

}

CoffeeOrder

package com.example.springbucksdemo.model;

import lombok.*;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;
import java.util.List;

/**
 * @Entity标注用于实体类声明语句之前,指出该Java 类为实体类,将映射到指定的数据库表。
 * 如声明一个实体类 CoffeeOrder,它将映射到数据库中的 @Table指定的名称表上 T_ORDER
 */
@Entity
@Data
@Builder
@ToString(callSuper = true)
@NoArgsConstructor
@AllArgsConstructor
@Table(name="T_ORDER")
public class CoffeeOrder extends BaseEntity implements Serializable {

    private String customer;
    /**
     * 咖啡跟订单的关系 多对多
     */
    @ManyToMany
    @JoinTable(name="T_ORDER_COFFEE")
    private List<Coffee> items;
    //不能为空值
    @Column(nullable = false)
    private OrderState state;

}

OrderState

package com.example.springbucksdemo.model;

public enum OrderState {
    INIT,PAID,BREWING,BREWED,TAKEN,CANCELLED
}

repository
BaseRepository

package com.example.springbucksdemo.repository;

import org.springframework.data.repository.NoRepositoryBean;
import org.springframework.data.repository.PagingAndSortingRepository;

import java.util.List;

/**
 *  extends 分页and排序
 * @param <T>
 * @param <Long>
 *
 * 分页查询
 * PagingAndSortingRepository<T,ID>
 * Pageable / Sort
 * Slice<T> / Page<T>
 *
 * @NoRepositoryBean 表示不需要为BaseRepository创建一个bean
 */
@NoRepositoryBean
public interface BaseRepository<T,Long> extends PagingAndSortingRepository<T,Long> {
    List<T> findTop3ByOrderByUpdateTimeDescIdAsc();
}

package com.example.springbucksdemo.repository;

import com.example.springbucksdemo.model.CoffeeOrder;

import java.util.List;

public interface CoffeeOrderRepository extends BaseRepository<CoffeeOrder, Long> {
    List<CoffeeOrder> findByCustomerOrderById(String customer);
    List<CoffeeOrder> findByItems_Name(String name);
}

package com.example.springbucksdemo.repository;

import com.example.springbucksdemo.model.Coffee;

public interface CoffeeRepository extends BaseRepository<Coffee,Long> {
}

yml

spring:
  jpa:
    hibernate:
      ddl-auto: create-drop #create and drop schema
    properties:
      hibernate:
        format_sql: true
        show_sql: true


        <!--金额处理-->
        <dependency>
            <groupId>org.joda</groupId>
            <artifactId>joda-money</artifactId>
            <version>1.0.1</version>
        </dependency>

        <!--映射相关定制信息,帮助joda-money类的映射-->
        <dependency>
            <groupId>org.jadira.usertype</groupId>
            <artifactId>usertype.core</artifactId>
            <version>6.0.1.GA</version>
        </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>

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