使用JPA方式访问mysql数据库

首先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>2.4.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.alibaba</groupId>
    <artifactId>springboot2xdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot2xdemo</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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.ibeetl</groupId>
            <artifactId>beetl-framework-starter</artifactId>
            <version>1.1.15.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

其次是当前文件夹所有相关文件

首先是HomeController的代码

package com.alibaba.springboot2xdemo.controller;

import com.alibaba.springboot2xdemo.models.Users;
import com.alibaba.springboot2xdemo.repository.UsersRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@SpringBootApplication
@RestController
@RequestMapping("/home")
public class HomeController {

    @Autowired
    private UsersRepository usersRepository ;

    @RequestMapping("/getAll")
    public List<Users> getAll(){
        List<Users> listUsers = (List<Users>) usersRepository.findAll();
        return listUsers;
    }
}

其次是Users的代码

package com.alibaba.springboot2xdemo.models;

import javax.persistence.*;

@Entity
@Table(name="users")
public class Users {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    @Column(name="name")
    private String name;
    @Column(name="password")
    private String password;
    @Column(name="age")
    private int age;
    @Column(name="city")
    private String city;
    @Column(name="address")
    private String address;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

接着是UsersRepository的代码

package com.alibaba.springboot2xdemo.repository;

import com.alibaba.springboot2xdemo.models.Users;
import org.beetl.sql.core.annotatoin.Param;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Component;

import java.util.List;


public interface UsersRepository extends CrudRepository<Users,Integer> {

    @Query("select u from Users u where u.name=?1")
    public List<Users> getUsersByName(@Param("name") String name);

    @Query("select u from Users u where u.name=?1 and u.password=?2")
    public List<Users> getUsersByNameAndPassword(@Param("name") String name,@Param("password") String password);

    @Query("select u from Users u where u.id=?1")
    public Users getUsersById(int id);



}

然后是Springboot2xdemoApplication.java的代码

package com.alibaba.springboot2xdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Springboot2xdemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(Springboot2xdemoApplication.class, args);
    }

}

最后是配置文件

spring.application.name=springBoot2xDemo
server.port=8088
spring.datasource.url=jdbc:mysql://lukairui.rwlb.rds.aliyuncs.com/test_db1?useSSL=false
spring.datasource.username=flink_admin
spring.datasource.password=xxxxx
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect

-----------附件是数据库的建表语句-------------------

/*
 Navicat Premium Data Transfer

 Source Server         : lukairui.rwlb.rds.aliyuncs.com
 Source Server Type    : MySQL
 Source Server Version : 80013
 Source Host           : lukairui.rwlb.rds.aliyuncs.com:3306
 Source Schema         : test_db1

 Target Server Type    : MySQL
 Target Server Version : 80013
 File Encoding         : 65001

 Date: 16/03/2021 18:35:24
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for users
-- ----------------------------
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  `city` varchar(255) DEFAULT NULL,
  `address` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

-- ----------------------------
-- Records of users
-- ----------------------------
BEGIN;
INSERT INTO `users` VALUES (1, 'lukairui', 'ksdf', 11, 'hangzhou', 'adhfu');
INSERT INTO `users` VALUES (2, 'tianlu', 'difur', 23, 'beijing', 'adir');
INSERT INTO `users` VALUES (3, 'lsdfk', 'iru', 11, 'peking', 'difur');
COMMIT;

SET FOREIGN_KEY_CHECKS = 1;