SpringBoot中JPA组件深入查询业务实现

1.JPA通过方法名解析数据可操作方式，其中Stock通过继承JpaRepository接口所指定的泛型决定的。

java 复制代码

package com.test.repo;

import com.test.model.Stock;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Component;
import java.util.List;

/**
 * @Author:     沐槿
 * @Description:  TODO
 * @Date:    2025/12/15 14:38
 * @Version:    1.0
 */
// 用@Component注解放入Spring容器中
@Component
public interface StockRepo extends JpaRepository<Stock, Integer> {
    //JPA将根据方法名自动拼接查询语句
    //JPA根据方法名拼接出如下数据库
    //select * from Stock where name = #name
    public List<Stock> findByName(String name);

2.通过@Query查询数据，实现基于JPQL的方式查询数据。

Repo类

java 复制代码

package com.test.repo;

import com.test.model.Stock;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Component;
import java.util.List;

/**
 * @Author:     沐槿
 * @Description:  TODO
 * @Date:    2025/12/15 14:38
 * @Version:    1.0
 */
// 用@Component注解放入Spring容器中
@Component
public interface StockRepo extends JpaRepository<Stock, Integer> {
    //JPA将根据方法名自动拼接查询语句
    //JPA根据方法名拼接出如下数据库
    //select * from Stock where name = #name
    public List<Stock> findByName(String name);

    //JPA中@Query注解，实现基于JPQL的方式查询数据。
    //JPQL语句等价于SQL （select s from Stock s where s.description like 'desc参数'）
    @Query("select s from Stock s where s.description like ?1%")
    public List<Stock> getStockByDesc(String desc);

    //使用nativeQuery参数运行原生数据库
    @Query(value="select s from Stock s where s.description like ?1%",nativeQuery = true)
    public List<Stock> getStockByNativeQuery(String nativeQuery);
}

2.通过@Query查询数据，实现基于JPQL的方式查询数据。

Repo类

java 复制代码

package com.test.repo;

import com.test.model.Stock;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Component;
import java.util.List;

/**
 * @Author:     沐槿
 * @Description:  TODO
 * @Date:    2025/12/15 14:38
 * @Version:    1.0
 */
// 用@Component注解放入Spring容器中
@Component
public interface StockRepo extends JpaRepository<Stock, Integer> {
    //JPA将根据方法名自动拼接查询语句
    //JPA根据方法名拼接出如下数据库
    //select * from Stock where name = #name
    public List<Stock> findByName(String name);

    //JPA中@Query注解，实现基于JPQL的方式查询数据。
    //JPQL语句等价于SQL （select s from Stock s where s.description like 'desc参数'）
    @Query("select s from Stock s where s.description like ?1%")
    public List<Stock> getStockByDesc(String desc);

    //使用nativeQuery参数运行原生数据库
    @Query(value="select s from Stock s where s.description like ?1%",nativeQuery = true)
    public List<Stock> getStockByNativeQuery(String nativeQuery);
}

2.通过@Query查询数据，实现基于JPQL的方式查询数据。

Repo类

java 复制代码

package com.test.repo;

import com.test.model.Stock;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Component;
import java.util.List;

/**
 * @Author:     沐槿
 * @Description:  TODO
 * @Date:    2025/12/15 14:38
 * @Version:    1.0
 */
// 用@Component注解放入Spring容器中
@Component
public interface StockRepo extends JpaRepository<Stock, Integer> {
    //JPA将根据方法名自动拼接查询语句
    //JPA根据方法名拼接出如下数据库
    //select * from Stock where name = #name
    public List<Stock> findByName(String name);

    //JPA中@Query注解，实现基于JPQL的方式查询数据。
    //JPQL语句等价于SQL （select s from Stock s where s.description like 'desc参数'）
    @Query("select s from Stock s where s.description like ?1%")
    public List<Stock> getStockByDesc(String desc);

    //使用nativeQuery参数运行原生数据库
    @Query(value="select s from Stock s where s.description like ?1%",nativeQuery = true)
    public List<Stock> getStockByNativeQuery(String nativeQuery);
}

业务实现类

java 复制代码

package com.test.service;


import com.test.model.Stock;
import com.test.repo.StockRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @Author:     沐槿
 * @Description:  TODO  
 * @Date:    2025/12/15 14:38
 * @Version:    1.0
 */
@Service
public class StockService {
    @Autowired
    StockRepo stockRepo;

    public List<Stock> getStockByNativeQuery(String desc) {
        return stockRepo.getStockByNativeQuery(desc);
    }

    public List<Stock> getStockByDesc(String desc) {
        return stockRepo.getStockByDesc(desc);
    }
}

控制器类

java 复制代码

package com.test.controller;


import com.test.model.Stock;
import com.test.service.StockPageAndSortingService;
import com.test.service.StockService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.jpa.repository.Query;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @Author:     沐槿
 * @Description:  TODO  
 * @Date:    2025/12/15 14:37
 * @Version:    1.0
 */
@RestController
public class Controller {
    @Autowired
    StockService stockService;

    @RequestMapping("/getStockByDesc/{desc}")
    List<Stock> getStockByDesc(@PathVariable String desc){
        return stockService.getStockByDesc(desc);
    }

    @RequestMapping("/getStockByNativeQuery/{desc}")
    List<Stock> getStockByNativeQuery(@PathVariable String desc){
        return stockService.getStockByNativeQuery(desc);
    }

重启SpringBoot项目，在浏览器中输入地址

http://localhost:8080/getStockByDesc/Good

能看到

javascript 复制代码

[{"id":1,"name":"computer","num":10,"description":"Good"},{"id":2,"name":"Mac","num":8,"description":"Good"}]

在浏览器中输入地址

http://localhost:8080/getStockByNativeQuery/Good

能看到

javascript 复制代码

[{"id":1,"name":"computer","num":10,"description":"Good"},{"id":2,"name":"Mac","num":8,"description":"Good"}]