pom文件

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.0.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.blb</groupId> <artifactId>springboot_jpa</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springboot_jpa</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </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> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>

yml文件

server: port: 8081spring: application: name: pomit datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/boot?characterEncoding=utf8&serverTimezone=UTC username: root password: sugar888 type: org.apache.commons.dbcp.BasicDataSource dbcp2: max-wait-millis: 60000 min-idle: 20 initial-size: 2 validation-query: SELECT 1 test-while-idle: true test-on-borrow: true test-on-return: false jpa: database: mysql show-sql: true hibernate: ddl-auto: none naming: implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy

dto

package com.blb.dto;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.Id;import javax.persistence.Table;@Entity@Table(name = "user_role")public class UserRole { @Id private int id; @Column(name = "user_name") private String userName; private String role; private String phone; 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 getRole() { return role; } public void setRole(String role) { this.role = role; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; }}

dao

package com.blb.dao;import com.blb.dto.UserRole;import org.springframework.data.repository.CrudRepository;import java.util.List;public interface UserRoleDao extends CrudRepository<UserRole,Integer> { List<UserRole> findByRole(String role);}

service

package com.blb.service;import com.blb.dao.UserRoleDao;import com.blb.dto.UserRole;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import javax.transaction.Transactional;import java.util.List;@Servicepublic class UserRoleService { @Autowired private UserRoleDao userRoleDao; public List<UserRole> selectAll() { return (List<UserRole>)userRoleDao.findAll(); } public void saveTest(UserRole userRole) { userRoleDao.save(userRole); } @Transactional public void update(Integer id,String phone) { UserRole userRole = userRoleDao.findById(id).orElse(null); if(userRole != null) { userRole.setPhone(phone); userRoleDao.save(userRole); } } @Transactional public void delete(Integer id) { userRoleDao.deleteById(id); } public List<UserRole> findByRole(String role) { return userRoleDao.findByRole(role); }}

controller

package com.blb.controller;import com.blb.dto.UserRole;import com.blb.service.UserRoleService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController@RequestMapping("/db")public class TestJpaRest { @Autowired private UserRoleService userRoleService; @RequestMapping(value = "/query") public List<UserRole> query() { return userRoleService.selectAll(); } @RequestMapping("/testFind") public List<UserRole> testFind() { return userRoleService.findByRole("admin"); } @RequestMapping("/save") public String save() { UserRole userRole = new UserRole(); userRole.setRole("Test"); userRole.setUserName("Test"); userRole.setPhone("159611"); userRoleService.saveTest(userRole); return "0000"; } @RequestMapping("/update") public String update() { userRoleService.update(4,"7899"); return "0000"; } @RequestMapping("/delete") public String delete() { userRoleService.delete(5); return "0000"; }}

启动器

package com.blb;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class SpringbootJpaApplication { public static void main(String[] args) { SpringApplication.run(SpringbootJpaApplication.class, args); }}