Fatal编程技术网
  • java/
  • Java 在内存数据库中的H2和Spring boot@Entity类之间存储和检索JSON类型的数据

Java 在内存数据库中的H2和Spring boot@Entity类之间存储和检索JSON类型的数据

java json spring-boot hibernate

Java 在内存数据库中的H2和Spring boot@Entity类之间存储和检索JSON类型的数据,java,json,spring-boot,hibernate,spring-data-jpa,Java,Json,Spring Boot,Hibernate,Spring Data Jpa,我在spring boot应用程序中的H2内存数据库中创建了两个表，如下所示： 餐厅餐桌 书桌 我现在要问的第一个问题是，如何使用SQL命令（特别是JSON字段“TABLES”）将数据插入到Restaurant表中，该字段实际以JSON格式存储另一个BOOKTABLE表中的数据？ 这个问题正确吗 INSERT INTO RESTAURANT VALUES (2, 'Saraya', '2021-05-25', '[{"tableId": 1, "seatingCap

我在spring boot应用程序中的H2内存数据库中创建了两个表，如下所示：

  • 餐厅餐桌
  • 书桌
    • 我现在要问的第一个问题是，如何使用SQL命令（特别是JSON字段“TABLES”）将数据插入到Restaurant表中，该字段实际以JSON格式存储另一个BOOKTABLE表中的数据？ 这个问题正确吗

    INSERT INTO RESTAURANT VALUES (2, 'Saraya', '2021-05-25', '[{"tableId": 1, "seatingCapacity": 12, "isAvailable": true}]');
    注意：我希望餐厅表能够存储多个表，因此JSON字符串中包含数组。

    接下来，我在Spring Boot项目中定义了这两个@Entity类：

  • Restaurant.java
  • BookTable.java
    • 我正在尝试对这些实体执行基本CRUD操作。我为我的餐厅实体创建了以下控制器：

    RestaurantController.java

    @RestController
@RequestMapping("/v1/restaurants")
public class RestaurantController {

    private final RestaurantService restaurantService;

    public RestaurantController(RestaurantService restaurantService) {
        this.restaurantService = restaurantService;
    }

    @GetMapping(produces = "application/json")
    public List<Restaurant> getAllExistingRestaurants() {
        return restaurantService.getAllRestaurants();
    }

    @GetMapping(value = "/{id}", produces = "application/json")
    public Restaurant getRestaurantById(@PathVariable("id") Long reservationId) {
        return restaurantService.getRestaurant(reservationId);
    }

    @PostMapping(consumes = "application/json")
    private long addRestaurant(@RequestBody Restaurant restaurant) throws IOException, ClassNotFoundException {
        restaurantService.AddNewRestaurant(restaurant);
        return restaurant.getId();
    }
}

    package com.assignment.restaurantmanagement.service;

import com.assignment.restaurantmanagement.model.BookTable;
import com.assignment.restaurantmanagement.model.Restaurant;
import com.assignment.restaurantmanagement.repository.RestaurantRepository;
import com.fasterxml.jackson.core.JsonProcessingException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@Service
public class RestaurantService {

    private final RestaurantRepository restaurantRepository;
    private final TableService tableService;

    public RestaurantService(RestaurantRepository restaurantRepository, TableService tableService) {
        this.restaurantRepository = restaurantRepository;
        this.tableService = tableService;
    }

    // Retrieve all restaurants
    public List<Restaurant> getAllRestaurants() {
        List<Restaurant> restaurants = new ArrayList<>();
        restaurantRepository.findAll().forEach(restaurants::add);
        return restaurants;
    }

    // Retrieves a restaurant based on restaurant id
    public Restaurant getRestaurant(Long id) {
        Optional<Restaurant> restaurant = restaurantRepository.findById(id);
        return restaurant.get();
    }

    // Adds a new restaurant
    public void AddNewRestaurant(Restaurant restaurant) throws IOException, ClassNotFoundException 
    {
       //*Some code here*
    }
}

    public interface RestaurantRepository extends CrudRepository<Restaurant, Long> {
}

    public interface TableRepository extends CrudRepository<BookTable, Long> {
}

    @RestController
@请求映射（“/v1/restaurants”）
公共类餐厅控制器{
私人最终餐厅服务餐厅服务；
公共餐厅控制员（餐厅服务餐厅服务）{
this.restaurantService=restaurantService；
}
@GetMapping（products=“application/json”）
公共列表GetAllexistingTaurants（）{
return restaurantService.getAllRestaurants（）；
}
@GetMapping（value=“/{id}”，products=“application/json”）
公共餐厅getRestaurantById（@PathVariable（“id”）长预订id）{
返回restaurantService.getRestaurant（预订ID）；
}
@后期映射（consumes=“application/json”）
private long addRestaurant（@RequestBody Restaurant Restaurant）抛出IOException，ClassNotFoundException{
餐厅服务。新增餐厅（餐厅）；
return restaurant.getId（）；
}
}
    正如您在上面所看到的，目前我正在尝试3个REST API:GetAll（）、GetByID（）和Post（）。下面是服务类代码： RestaurantService.java

    @RestController
@RequestMapping("/v1/restaurants")
public class RestaurantController {

    private final RestaurantService restaurantService;

    public RestaurantController(RestaurantService restaurantService) {
        this.restaurantService = restaurantService;
    }

    @GetMapping(produces = "application/json")
    public List<Restaurant> getAllExistingRestaurants() {
        return restaurantService.getAllRestaurants();
    }

    @GetMapping(value = "/{id}", produces = "application/json")
    public Restaurant getRestaurantById(@PathVariable("id") Long reservationId) {
        return restaurantService.getRestaurant(reservationId);
    }

    @PostMapping(consumes = "application/json")
    private long addRestaurant(@RequestBody Restaurant restaurant) throws IOException, ClassNotFoundException {
        restaurantService.AddNewRestaurant(restaurant);
        return restaurant.getId();
    }
}

    package com.assignment.restaurantmanagement.service;

import com.assignment.restaurantmanagement.model.BookTable;
import com.assignment.restaurantmanagement.model.Restaurant;
import com.assignment.restaurantmanagement.repository.RestaurantRepository;
import com.fasterxml.jackson.core.JsonProcessingException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@Service
public class RestaurantService {

    private final RestaurantRepository restaurantRepository;
    private final TableService tableService;

    public RestaurantService(RestaurantRepository restaurantRepository, TableService tableService) {
        this.restaurantRepository = restaurantRepository;
        this.tableService = tableService;
    }

    // Retrieve all restaurants
    public List<Restaurant> getAllRestaurants() {
        List<Restaurant> restaurants = new ArrayList<>();
        restaurantRepository.findAll().forEach(restaurants::add);
        return restaurants;
    }

    // Retrieves a restaurant based on restaurant id
    public Restaurant getRestaurant(Long id) {
        Optional<Restaurant> restaurant = restaurantRepository.findById(id);
        return restaurant.get();
    }

    // Adds a new restaurant
    public void AddNewRestaurant(Restaurant restaurant) throws IOException, ClassNotFoundException 
    {
       //*Some code here*
    }
}

    public interface RestaurantRepository extends CrudRepository<Restaurant, Long> {
}

    public interface TableRepository extends CrudRepository<BookTable, Long> {
}

    package com.assignment.restaurantmanagement.service；
导入com.assignment.restaurantmanagement.model.BookTable；
导入com.assignment.restaurantmanagement.model.Restaurant；
导入com.assignment.restaurantmanagement.repository.restaurantpository；
导入com.fasterxml.jackson.core.JsonProcessingException；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.stereotype.Service；
导入java.io.IOException；
导入java.util.ArrayList；
导入java.util.List；
导入java.util.Optional；
@服务
公营餐厅服务{
私人最终餐厅；
私有最终表服务表服务；
公共餐厅服务{
this.restaurantRepository=restaurantRepository；
this.tableService=表服务；
}
//检索所有餐厅
公共列表getAllRestaurants（）{
列表餐厅=新建ArrayList（）；
restaurantRepository.findAll（）.forEach（restaurants:：add）；
返回餐厅；
}
//根据餐厅id检索餐厅
公共餐厅（长id）{
可选餐厅=restaurantRepository.findById（id）；
返回餐厅；
}
//增加一家新餐厅
public void AddNewRestaurant（Restaurant Restaurant）抛出IOException，ClassNotFoundException
{
//*这里有一些代码*
}
}
    下面是为每个实体定义的存储库类： RestaurantRepository.java

    @RestController
@RequestMapping("/v1/restaurants")
public class RestaurantController {

    private final RestaurantService restaurantService;

    public RestaurantController(RestaurantService restaurantService) {
        this.restaurantService = restaurantService;
    }

    @GetMapping(produces = "application/json")
    public List<Restaurant> getAllExistingRestaurants() {
        return restaurantService.getAllRestaurants();
    }

    @GetMapping(value = "/{id}", produces = "application/json")
    public Restaurant getRestaurantById(@PathVariable("id") Long reservationId) {
        return restaurantService.getRestaurant(reservationId);
    }

    @PostMapping(consumes = "application/json")
    private long addRestaurant(@RequestBody Restaurant restaurant) throws IOException, ClassNotFoundException {
        restaurantService.AddNewRestaurant(restaurant);
        return restaurant.getId();
    }
}

    package com.assignment.restaurantmanagement.service;

import com.assignment.restaurantmanagement.model.BookTable;
import com.assignment.restaurantmanagement.model.Restaurant;
import com.assignment.restaurantmanagement.repository.RestaurantRepository;
import com.fasterxml.jackson.core.JsonProcessingException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@Service
public class RestaurantService {

    private final RestaurantRepository restaurantRepository;
    private final TableService tableService;

    public RestaurantService(RestaurantRepository restaurantRepository, TableService tableService) {
        this.restaurantRepository = restaurantRepository;
        this.tableService = tableService;
    }

    // Retrieve all restaurants
    public List<Restaurant> getAllRestaurants() {
        List<Restaurant> restaurants = new ArrayList<>();
        restaurantRepository.findAll().forEach(restaurants::add);
        return restaurants;
    }

    // Retrieves a restaurant based on restaurant id
    public Restaurant getRestaurant(Long id) {
        Optional<Restaurant> restaurant = restaurantRepository.findById(id);
        return restaurant.get();
    }

    // Adds a new restaurant
    public void AddNewRestaurant(Restaurant restaurant) throws IOException, ClassNotFoundException 
    {
       //*Some code here*
    }
}

    public interface RestaurantRepository extends CrudRepository<Restaurant, Long> {
}

    public interface TableRepository extends CrudRepository<BookTable, Long> {
}

    public interface RestaurantRepository扩展了crudepository{
}
    TableRepository.java

    @RestController
@RequestMapping("/v1/restaurants")
public class RestaurantController {

    private final RestaurantService restaurantService;

    public RestaurantController(RestaurantService restaurantService) {
        this.restaurantService = restaurantService;
    }

    @GetMapping(produces = "application/json")
    public List<Restaurant> getAllExistingRestaurants() {
        return restaurantService.getAllRestaurants();
    }

    @GetMapping(value = "/{id}", produces = "application/json")
    public Restaurant getRestaurantById(@PathVariable("id") Long reservationId) {
        return restaurantService.getRestaurant(reservationId);
    }

    @PostMapping(consumes = "application/json")
    private long addRestaurant(@RequestBody Restaurant restaurant) throws IOException, ClassNotFoundException {
        restaurantService.AddNewRestaurant(restaurant);
        return restaurant.getId();
    }
}

    package com.assignment.restaurantmanagement.service;

import com.assignment.restaurantmanagement.model.BookTable;
import com.assignment.restaurantmanagement.model.Restaurant;
import com.assignment.restaurantmanagement.repository.RestaurantRepository;
import com.fasterxml.jackson.core.JsonProcessingException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@Service
public class RestaurantService {

    private final RestaurantRepository restaurantRepository;
    private final TableService tableService;

    public RestaurantService(RestaurantRepository restaurantRepository, TableService tableService) {
        this.restaurantRepository = restaurantRepository;
        this.tableService = tableService;
    }

    // Retrieve all restaurants
    public List<Restaurant> getAllRestaurants() {
        List<Restaurant> restaurants = new ArrayList<>();
        restaurantRepository.findAll().forEach(restaurants::add);
        return restaurants;
    }

    // Retrieves a restaurant based on restaurant id
    public Restaurant getRestaurant(Long id) {
        Optional<Restaurant> restaurant = restaurantRepository.findById(id);
        return restaurant.get();
    }

    // Adds a new restaurant
    public void AddNewRestaurant(Restaurant restaurant) throws IOException, ClassNotFoundException 
    {
       //*Some code here*
    }
}

    public interface RestaurantRepository extends CrudRepository<Restaurant, Long> {
}

    public interface TableRepository extends CrudRepository<BookTable, Long> {
}

    public interface TableRepository扩展了crudepository{
}
    我还有以下问题：

  • 如何通过POST API调用在TABLES列中添加/存储多个BookTable对象（列表），该列在RESTAURANT表中具有JSON数据类型
  • 如何从餐厅表中读取相同的JSON列表格，并将其转换为BookTable对象或列表您现在面临的问题是什么？您尝试了什么？“表格”字段只是模型中的字符串。在发送到数据库之前，您可以使用ObjectMapper显式转换。这就是为什么我要说的是，您目前面临的问题是什么？我不太理解您的要求。我觉得您在寻找餐桌餐厅和餐桌之间的关系。它可能是一个一对多的关系。等等e餐厅桌子可以有一个booktable对象列表。