SpringBoot整合数据库访问层的实战
作者：无休止符
本文主要介绍了SpringBoot整合数据库访问层的实战，主要包含JdbcTemplate和mybatis框架的整合应用，具有一定的参考价值，感兴趣的可以了解一下
一、springboot整合使用JdbcTemplate
1.pom依赖
<!--SpringBoot整合jdbc模板框架-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!--SpringBoot整合mysql驱动类-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.21</version>
</dependency>
2.application.yml新增配置
spring:
datasource:
url: jdbc:mysql://localhost:3306/test
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
3.建表sql
CREATE TABLE `users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(32) NOT NULL COMMENT '用户名称', `age` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
4.UserService
@RestController
public class UserService {
@Autowired
private JdbcTemplate jdbcTemplate;
@RequestMapping("/insertUser")
public String insertUser(String name,Integer age){
int update = jdbcTemplate.update("insert into users values(null,?,?);", name, age);
return update > 0 ? "success" : "false";
}
}
5.浏览器访问
http://127.0.0.1:8080/insertUser?name=你好&age=21
二、整合mybatis框架查询
1.pom依赖
<!-- springboot 整合mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
2.实体类UserEntity
public class UserEntity {
private String userName;
private Integer age;
private Integer id;
//GET...SET...省略
}
3.UserMapper接口
public interface UserMapper {
@Select("select id as id,name as userName,age as age from users where id = #{id};")
UserEntity selectByUserId(@Param("id") Integer id);
}
4.UserService
@RestController
public class UserService {
@Autowired
private UserMapper userMapper;
@RequestMapping("/mybatisFindById")
public UserEntity mybatisFindById(Integer id){
return userMapper.selectByUserId(id);
}
}
5.app启动
注意：这里需要加注解@MapperScan("com.sjyl.mapper")来告诉spring接口mapper的扫包范围
@SpringBootApplication
@MapperScan("com.sjyl.mapper")
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class);
}
}
测试连接：http://127.0.0.1:8080/mybatisFindById?id=3
三、整合mybatis框架插入
1.UserMapper添加insertUser
public interface UserMapper {
@Insert("Insert into users values (null,#{userName},#{age});")
int insertUser(@Param("userName") String userName,@Param("age") Integer age);
@Select("select id as id,name as userName,age as age from users where id = #{id};")
UserEntity selectByUserId(@Param("id") Integer id);
}
2.UserService添加insertUserMybatis
@RestController
public class UserService {
@Autowired
private UserMapper userMapper;
@RequestMapping("/mybatisFindById")
public UserEntity mybatisFindById(Integer id){
return userMapper.selectByUserId(id);
}
@RequestMapping("/insertUserMybatis")
public String insertUserMybatis(String userName,Integer age){
int insert = userMapper.insertUser(userName,age);
return insert > 0 ? "success" : "false";
}
}
测试连接：http://127.0.0.1:8080/insertUserMybatis?userName=%E5%BC%A0%E4%B8%89&age=21
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