Sharding+SpringBoot+Mybatis 读写分离

基于Sharding JDBC的读写分离

1.引入pom.xml

    <dependencies>
        <!--  mybatis -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.1.5</version>
        </dependency>

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.0.3</version>
        </dependency>

        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.0.0-RC2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/io.shardingjdbc/sharding-jdbc-core -->
        <dependency>
            <groupId>io.shardingjdbc</groupId>
            <artifactId>sharding-jdbc-core</artifactId>
            <version>2.0.3</version>
        </dependency>

        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

    </dependencies>

2.建立实体类

public class User {
    @Id
    private Integer id;
    private String name;
    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

3.建立mapper

public interface UserMapper extends Mapper<User> {
}

4.建立service

/**
 * @description:
 * @author: mmc
 * @create: 2020-03-09 23:26
 **/
@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public void add(User user){
        userMapper.insert(user);
    }

    public List<User> list(){
       return userMapper.selectAll();
    }
}

5.建立controller

/**
 * @description:
 * @author: mmc
 * @create: 2020-03-09 23:27
 **/
@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/addUser")
    public void add(User user){
        userService.add(user);
    }

    @RequestMapping("/selectUser")
    public List<User> selectUser(){
        return userService.list();
    }

    @RequestMapping("/addAndList")
    public List<User> addAndList(User user){
        userService.add(user);
        return userService.list();
    }
}

6.写配置文件

spring.shardingsphere.datasource.names=master,slave0

spring.shardingsphere.datasource.master.type=org.apache.commons.dbcp.BasicDataSource
spring.shardingsphere.datasource.master.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.master.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&serverTimezone=UTC
spring.shardingsphere.datasource.master.username=root
spring.shardingsphere.datasource.master.password=0490218292

spring.shardingsphere.datasource.slave0.type=org.apache.commons.dbcp.BasicDataSource
spring.shardingsphere.datasource.slave0.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.slave0.url=jdbc:mysql://localhost:3306/slave0?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&serverTimezone=UTC
spring.shardingsphere.datasource.slave0.username=root
spring.shardingsphere.datasource.slave0.password=0490218292

spring.shardingsphere.masterslave.name=ms
spring.shardingsphere.masterslave.master-data-source-name=master
spring.shardingsphere.masterslave.slave-data-source-names=slave0

spring.shardingsphere.props.sql.show=true

7.启动类

@SpringBootApplication
@MapperScan("com.mmc.master.mapper")
public class ShardingApplication {

    public static void main(String[] args) {
        SpringApplication.run(ShardingApplication.class,args);
    }
}

8.测试

先在浏览器中测试新增是否是走主库

http://localhost:8080/addUser?name=wangxiao&age=11

在测试查询是否走的从库

http://localhost:8080/selectUser

注：本文描述的主从库并没有配置真正的主从关系，所以数据并没有同步，仅供学习读写分离。