SpringBoot整合jdbc

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/chen18677338530/article/details/90721200

修改pom文件，添加依赖

<?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 http://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>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.chen</groupId>
    <artifactId>springboot-jdbc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-jdbc</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-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

</project>

创建数据表

CREATE TABLE `user` (
  `id` int(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) DEFAULT NULL,
  `password` varchar(50) DEFAULT NULL,
  `age` int(2) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

修改数据库配置文件

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useUnico de=true&characterEncoding=utf-8&useSSL=true
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver

新建实体类

package com.chen.springbootjdbc.entity;

import lombok.*;

@Data
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class User {

    private Long id;

    private String name;

    private String password;

    private int age;

    public User(String name, String password, int age) {
        this.name = name;
        this.password = password;
        this.age = age;
    }
}

新建dao接口

package com.chen.springbootjdbc.dao;

import com.chen.springbootjdbc.entity.User;

import java.util.List;

public interface UserRepository {

    int save(User user);

    int update(User user);

    int delete(long id);

    List<User> findAll();

    User findById(long id);
}

新建接口实现类

package com.chen.springbootjdbc.dao.impl;

import com.chen.springbootjdbc.dao.UserRepository;
import com.chen.springbootjdbc.entity.User;
import com.chen.springbootjdbc.entity.mapper.UserRowMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public class UserRepositoryImpl implements UserRepository {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public int save(User user) {

        return jdbcTemplate.update("insert into user(name,password,age) values (?,?,?)", user.getName(),
                user.getPassword(), user.getAge());
    }

    @Override
    public int update(User user) {
        return jdbcTemplate.update("UPDATE users SET name = ? , password = ? , age = ? WHERE id=?", user.getName(), user.getPassword(), user.getAge(), user.getId());
    }

    @Override
    public int delete(long id) {
        return jdbcTemplate.update("DELETE FROM users where id = ?",id);
    }

    @Override
    public List<User> findAll() {
        return jdbcTemplate.query("SELECT * FROM users", new UserRowMapper());
    }

    @Override
    public User findById(long id) {
        return jdbcTemplate.queryForObject("SELECT * FROM users WHERE id=?", new Object[] { id }, new BeanPropertyRowMapper<User>(User.class));
    }
}