使用 Java 开发或者学习过程中,最避免不了的是连接和操作数据库,此次,学习如何在Spring Boot中配置和使用Mybatis框架,提高开发效率。
1、填写pom.xml
<!-- mybatis依赖jar包 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- web项目依赖jar包 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 热部署依赖jar包 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<!-- mysql连接jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 阿里巴巴druid数据源 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
2、填写application.properties
#数据驱动可配也可以不配,因为系统会自动识别
#spring.datasource.driver-class-name =com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/movie?useUnicode=true&characterEncoding=utf-8
spring.datasource.username =root
spring.datasource.password =root
#springboot有自带数据源这个也可不配置
spring.datasource.type =com.alibaba.druid.pool.DruidDataSource
#数据驱动可配也可以不配,因为系统会自动识别
#spring.datasource.driver-class-name =com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/movie?useUnicode=true&characterEncoding=utf-8
spring.datasource.username =root
spring.datasource.password =root
#让控制台打印SQL语句,一般用于本地开发环境
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
#springboot有自带数据源这个也可不配置
spring.datasource.type =com.alibaba.druid.pool.DruidDataSource
3、User实体
//用户实体
public class User {
private int id;
private String name;
private String phone;
private int age;
private Date createTime;
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 getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
}
4、Springboot主类
//@MapperScan会自动扫描里面的包,而且应该是可以自动给每个类装配一个Bean对象
@SpringBootApplication
@MapperScan("com.jincou.mapper")
public class MainApplication {
public static void main(String[] args) {
SpringApplication.run(MainApplication.class, args);
}
}
5、UserMapper
/**
* 功能描述:访问数据库的接口
*/
public interface UserMapper {
//推荐使用#{}取值,不要用${},因为存在注入的风险
@Insert("INSERT INTO user(name,phone,create_time,age) VALUES(#{name}, #{phone}, #{createTime},#{age})")
@Options(useGeneratedKeys=true, keyProperty="id", keyColumn="id") //keyProperty java对象的属性;keyColumn表示数据库的字段
int insert(User user);
//column指数据库中的列,property是指实体的属性名,如果一致就不需要写
@Select("SELECT * FROM user")
@Results({
@Result(column = "create_time",property = "createTime")
})
List<User> getAll();
@Select("SELECT * FROM user WHERE id = #{id}")
@Results({
@Result(column = "create_time",property = "createTime")
})
User findById(Long id);
@Update("UPDATE user SET name=#{name} WHERE id =#{id}")
void update(User user);
@Delete("DELETE FROM user WHERE id =#{userId}")
void delete(Long userId);
}
6、UserServise层
public interface UserService {
//这里只写了个add方法,其它的直接在控制层调用Dao层,正常开发流程都应该写在Service层
public int add(User user);
}
7、UserServiseImpl
@Service
public class UserServiceImpl implements UserService{
//因为主类的@MapperScan方法,所以自动为UserMapper装配了一个userMapper对象
@Autowired
private UserMapper userMapper;
//这里你传过去的时候user的id为null,而insert之后传回回来的user会把数据库中的id值带回来,真强大
@Override
public int add(User user) {
userMapper.insert(user);
int id = user.getId();
return id;
}
}
8、Controller类
@RestController
@RequestMapping("/api/v1/user")
public class UserController {
//在UserServiceImpl定义了@Service实现类所以可以得到默认首字母小写的对象
@Autowired
private UserService userService;
@Autowired
private UserMapper userMapper;
/**
* 功能描述: user 保存接口
*/
@GetMapping("add")
public Object add(){
User user = new User();
user.setAge(11);
user.setCreateTime(new Date());
user.setName("张三");
user.setPhone("1880177");
int id = userService.add(user);
return id;
}
/**
* 功能描述:查找全部用户
* 这里和下面是直接调用跳过Servise层,直接到DAO层
*/
@GetMapping("findAll")
public Object findAll(){
return userMapper.getAll();
}
/**
* 查找单个用户
*/
@GetMapping("find_by_id")
public Object findById(long id){
return userMapper.findById(id);
}
/**
* 删除单个用户
*/
@GetMapping("del_by_id")
public Object delById(long id){
userMapper.delete(id);
return "";
}
/**
*更新用户
*/
@GetMapping("update")
public Object update(String name,int id){
User user = new User();
user.setName(name);
user.setId(id);
userMapper.update(user);
return "";
}
}
测试
1.准备好数据库数据:
#Sql脚本
CREATE TABLE `user` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(128) DEFAULT NULL COMMENT '名称',
`phone` varchar(16) DEFAULT NULL COMMENT '用户手机号',
`create_time` datetime DEFAULT NULL COMMENT '创建时间',
`age` int(4) DEFAULT NULL COMMENT '年龄',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=18 DEFAULT CHARSET=utf8;
2测试结果
插入用户,看后台的sql语句文章来源:https://www.toymoban.com/news/detail-486289.html
文章来源地址https://www.toymoban.com/news/detail-486289.html
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