SpringBoot整合Mybatis（yml方式）
Posted 低调的狗狗
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本来打算写个使用Sharding-JDBC的例程，但是在搭建Mybatis的过程中，一波三折，因为好久没搭建项目了，另外加上换了电脑。所以很破折，在这里记录一下Spring Boot整合Mybatis吧。可能很简单，但是我长时间没用忘记了，我这里备忘一下吧。
一、项目目录结构
注意这里Application文件的位置，它是与controller、entity、mapper、service等包处于并列的关系。
二、数据库文件
SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for t_user_00 -- ---------------------------- DROP TABLE IF EXISTS `t_user_00`; CREATE TABLE `t_user_00` ( `id` int(0) NOT NULL AUTO_INCREMENT, `user_id` int(0) NOT NULL, `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `age` int(0) NOT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; SET FOREIGN_KEY_CHECKS = 1;
三、pom.xml
<?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>2.1.13.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.gougou</groupId> <artifactId>shardingjdbc-shardingtable-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>shardingjdbc-shardingtable-demo</name> <description>shardingjdbc-shardingtable-demo</description> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </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>
四、application.yml
# 数据源
spring:
application:
name: shardingjdbc-shardingtable-demo
datasource:
url: jdbc:mysql://localhost:3306/sharding_0?serverTimezone=UTC
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
dbcp2:
min-idle: 5 # 数据库连接池的最小维持连接数
initial-size: 5 # 初始化连接数
max-total: 5 # 最大连接数
max-wait-millis: 150 # 等待连接获取的最大超时时间
# mybatis配置
mybatis:
mapper-locations: classpath:mapper/*.xml # mapper映射文件位置
type-aliases-package: com.gouggou.shardingtable.entity # 实体类所在的位置
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #用于控制台打印sql语句
五、启动类Application
说明：
1、@MapperScan的：扫描mapper接口的位置
2、@ComponentScan：如果Application文件的位置不是与controller、entity、mapper、service等包处于并列的关系。就要用此注解，否则可以不用；
@MapperScan("com.gouggou.shardingtable.mapper")
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
六、controller
@RequestMapping("student")
@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("save")
public String save() {
User user = new User();
user.setUserId(new Random().nextInt( 1000 ) + 1);
user.setName("张三"+user.getUserId());
user.setAge(new Random().nextInt( 80 ) + 1);
userService.insert(user);
return user.getName()+"创建成功！";
}
}
七、service
public interface UserService { Integer insert(User u); List<User> findAll(); List<User> findByUserIds(List<Integer> userIds); }
@Service public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; @Override public Integer insert(User u) { return userMapper.insert(u); } @Override public List<User> findAll() { return userMapper.findAll(); } @Override public List<User> findByUserIds(List<Integer> userIds) { return userMapper.findByUserIds(userIds); } }
八、entity
@Data public class User implements Serializable { private static final long serialVersionUID = -5514139686858156155L; private Integer id; private Integer userId; private String name; private Integer age; }
九、Mapper
@Repository public interface UserMapper { Integer insert(User u); List<User> findAll(); List<User> findByUserIds(List<Integer> userIds); }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.gouggou.shardingtable.mapper.UserMapper" > <resultMap id="resultMap" type="com.gouggou.shardingtable.entity.User" > <id column="id" property="id" jdbcType="INTEGER" /> <result column="user_id" property="userId" jdbcType="INTEGER" /> <result column="name" property="name" jdbcType="VARCHAR" /> <result column="age" property="age" jdbcType="INTEGER" /> </resultMap> <insert id="insert"> insert into t_user_00 (user_id,name,age) values (#{userId},#{name},#{age}) </insert> <select id="findAll" resultMap="resultMap"> select <include refid="columnsName"/> from t_user_00 </select> <select id="findByUserIds" resultMap="resultMap"> select <include refid="columnsName"/> from t_user_00 where user_id in ( <foreach collection="list" item="item" separator=","> #{item} </foreach> ) </select> <sql id="columnsName"> id,user_id,name,age </sql> </mapper>
十、遇到的问题
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