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# SpringBoot 整合 JDBC Templete 实现 CRUD 案例
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今天是 2019/6/15，写这个案例的主要目的是，因为我是应届生，第一天上班拿到的项目采用的就是 SpringMVC + JDBC Templete + Bootstrap + easyUI ，通过前面的学习，我们知道还有更多，更好的框架来进行持久层的开发，例如Hibernate，SpringData JPA ，Mybatis 等，但是因为工作需要，我还是决定自己动手写一个SpringBoot整合JDBC Templete的案例。俗话说的好，技多不压身！
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## 解惑
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- 为什么不是采用SSM进行整合？
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你可以这么理解，其实SpringBoot和SSM是同一个东西，表达的意思也是相同的，例如写一篇文章，采用白话文的方式和文言文的方式，结果都能完成文章，但是文言文更加的简洁。
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- 体验一下SSM与SpringBoot的区别有多大？
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SSM 客户管理系统：这个项目采用的是传统的SSM的方式，写的一个客户关系管理系统，仔细观察可以发现配置文件多，而且偏复杂，[SSM 客户管理系统源码示例](https://github.com/tellsea/ssm)
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SpringBoot入门案例：这个项目就是采用SpringBoot的方式，输出Hello World的案例，仔细观察可以发现只有一个配置文件，而且还是空的，其实全部都由SpringBoot帮我们配置好了，[SpringBoot入门案例Hello World](https://github.com/Tellsea/springboot-learn/tree/master/springboot-hello)
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下面正式准备我们本次实现的案例，觉得项目有用的话，顺便 Star 和 Fork 一下噢 🎉🎉
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## 准备工作
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### 数据库
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找到项目的`doc/sql/springboot-jdbc-templete.sql`文件，导入到自己的数据库中，也可以根据下面的sql进行创建
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```sql
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CREATE TABLE `tb_user` (
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`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
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`username` varchar(255) DEFAULT NULL COMMENT '用户名',
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`password` varchar(255) DEFAULT NULL COMMENT '密码',
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`ctime` datetime DEFAULT NULL COMMENT '创建时间',
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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```
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### 依赖
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刚开始搭建项目的话，很容易迷，所以这里我贴一个项目目录结构
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![项目目录结构](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/0.png)
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创建SpringBoot项目，完整的依赖我这里粘贴一份
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.3.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>cn.tellsea</groupId>
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<artifactId>springboot-jdbc-templete</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>springboot-jdbc-templete</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<!-- spring boot -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<!-- jdbc -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-jdbc</artifactId>
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</dependency>
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<!-- 数据库驱动，我是MySQL5.7，所以使用5.1.x的驱动，如果你是MySQL8，则改成8.0.x的版本 -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>5.1.46</version>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.8</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
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```
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### 配置文件
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注意改成自己的相关属性值
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```yml
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server:
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port: 8080
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spring:
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datasource:
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driver-class-name: com.mysql.jdbc.Driver
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url: jdbc:mysql://localhost:3306/springboot-jdbc-templete
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username: root
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password: 123456
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```
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### SpringBoot启动类
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创建SpringBoot项目的话，这个应该是自动生成的，这里给通过Maven创建项目的同学粘贴一个启动类
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```java
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@SpringBootApplication
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public class SpringbootJdbcTempleteApplication {
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public static void main(String[] args) {
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SpringApplication.run(SpringbootJdbcTempleteApplication.class, args);
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}
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}
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```
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## 编写代码
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- 实体类，采用了Lombok表达式，不清楚的同学可以看我 [SSM的项目文档](https://github.com/Tellsea/ssm) 有简单的说明
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```java
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@Data
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@AllArgsConstructor
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@NoArgsConstructor
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public class User {
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private Long id;
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private String username;
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private String password;
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private Date ctime;
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}
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```
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- dao接口
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```java
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public interface UserDao {
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User getUserById(Integer id);
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List<User> getUserList();
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int add(User user);
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int update(User user);
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int delete(Integer id);
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}
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```
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- dao 实现类，jdbcTemplate 是注入的对象
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```java
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@Repository // 用于标注数据访问组件
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public class UserDaoImpl implements UserDao {
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@Autowired
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private JdbcTemplate jdbcTemplate;
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@Override
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public User getUserById(Long id) {
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List<User> list = jdbcTemplate.query("select * from tb_user where id = ?", new Object[]{id}, new BeanPropertyRowMapper(User.class));
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if (list != null && list.size() > 0) {
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return list.get(0);
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} else {
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return null;
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}
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}
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@Override
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public List<User> getUserList() {
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List<User> list = jdbcTemplate.query("select * from tb_user", new Object[]{}, new BeanPropertyRowMapper(User.class));
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if (list != null && list.size() > 0) {
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return list;
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} else {
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return null;
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}
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}
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@Override
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public int add(User user) {
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return jdbcTemplate.update("insert into tb_user(username, password, ctime) values(?, ?, ?)",
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user.getUsername(), user.getPassword(), new Date());
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}
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@Override
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public int update(User user) {
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return jdbcTemplate.update("update tb_user SET username = ? , password = ? WHERE id=?",
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user.getUsername(), user.getPassword(), user.getId());
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}
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@Override
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public int delete(Long id) {
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return jdbcTemplate.update("delete from tb_user where id = ? ", id);
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}
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}
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```
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- service 层接口
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```java
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public interface UserService {
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User getUserById(Integer id);
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List<User> getUserList();
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int add(User user);
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int update(User user);
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int delete(Integer id);
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}
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```
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- service 层实现类，很简单，直接调用dao层就行了
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```java
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@Service
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public class UserServiceImpl implements UserService {
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@Autowired
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private UserDao userDao;
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@Override
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public User getUserById(Integer id) {
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return userDao.getUserById(id);
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}
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@Override
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public List<User> getUserList() {
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return userDao.getUserList();
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}
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@Override
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public int add(User user) {
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return userDao.add(user);
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}
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@Override
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public int update(User user) {
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return userDao.update(user);
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}
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@Override
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public int delete(Integer id) {
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return userDao.delete(id);
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}
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}
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```
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- 下面这个是一个简单的公共数据返回类，通常项目中都是必须存在的，用于指定统一的响应数据格式，更复杂的写法在SpringBoot的基础模块学习，[SpringBoot 搭建全局异常处理](https://github.com/Tellsea/springboot-learn/tree/master/springboot-global)
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```java
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@Data
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@AllArgsConstructor
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@NoArgsConstructor
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public class ResponseResult {
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private Integer code;
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private String msg;
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private Object data;
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}
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```
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- 控制层
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```java
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@RestController
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@RequestMapping("/user")
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public class UserController {
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@Autowired
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private UserService userService;
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/**
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* 根据id查询用户
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*
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* @param id
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* @return
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*/
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@GetMapping("/get/{id}")
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public ResponseResult getUserById(@PathVariable(value = "id") Long id) {
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User user = userService.getUserById(id);
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if (user == null) {
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return new ResponseResult(200, "查询结果为空", null);
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}
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return new ResponseResult(200, "查询成功", user);
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}
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/**
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* 查询用户列表
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*
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* @return
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*/
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@GetMapping("/list")
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public ResponseResult getUserList() {
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List<User> list = userService.getUserList();
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if (list == null || list.isEmpty()) {
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return new ResponseResult(200, "查询结果为空", null);
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}
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return new ResponseResult(200, "查询成功", list);
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}
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/**
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* 新增用户
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*
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* @param user
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* @return
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*/
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@PostMapping("/add")
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public ResponseResult add(@RequestBody User user) {
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int count = userService.add(user);
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if (count == 0) {
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return new ResponseResult(500, "新增失败", null);
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}
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return new ResponseResult(200, "新增成功", null);
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}
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/**
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* 根据id删除用户
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*
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* @param id
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* @return
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*/
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@GetMapping("/delete/{id}")
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public ResponseResult delete(@PathVariable(value = "id") Long id) {
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int count = userService.delete(id);
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if (count == 0) {
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return new ResponseResult(500, "删除失败", null);
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}
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return new ResponseResult(200, "删除成功", null);
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}
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/**
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* 根据id修改用户信息
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*
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* @param user
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* @return
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*/
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@PostMapping("/update")
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public ResponseResult update(@RequestBody User user) {
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int count = userService.update(user);
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if (count == 0) {
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return new ResponseResult(500, "更新失败", null);
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}
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return new ResponseResult(200, "更新成功", null);
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}
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}
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```
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## 测试
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我这里直接使用Postman测试工具进行测试，不会使用的话你也可以直接使用SpringBoot带的单元测试
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- 新增用户
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![新增用户](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/1.png)
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- 根据ID查询
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![根据ID查询](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/2.png)
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- 查询列表
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![查询列表](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/3.png)
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- 更新用户
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![更新用户](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/4.png)
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- 删除用户
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![删除用户](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/5.png)
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# 交流学习
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QQ：3210054449
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![交流学习](https://github.com/Tellsea/springboot-learn/blob/master/springboot-jdbc-templete/doc/images/qq-group.png)

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