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+# spring-boot-demo-multi-datasource-mybatis
+
+> 此 demo 主要演示了 Spring Boot 如何集成 Mybatis 的多数据源。可以自己基于AOP实现多数据源，这里基于 Mybatis-Plus 提供的一个优雅的开源的解决方案来实现。
+
+## 准备工作
+
+准备两个数据源，分别执行如下建表语句
+
+```mysql
+DROP TABLE IF EXISTS `multi_user`;
+CREATE TABLE `multi_user`(
+ `id` bigint(64) NOT NULL,
+ `name` varchar(50) DEFAULT NULL,
+ `age` int(30) DEFAULT NULL,
+ PRIMARY KEY (`id`) USING BTREE
+) ENGINE = InnoDB
+ AUTO_INCREMENT = 1
+ CHARACTER SET = utf8
+ COLLATE = utf8_general_ci;
+```
+
+## 导入依赖
+
+```xml
+
+
+ 4.0.0
+
+ spring-boot-demo-multi-datasource-mybatis
+ 1.0.0-SNAPSHOT
+ jar
+
+ spring-boot-demo-multi-datasource-mybatis
+ Demo project for Spring Boot
+
+
+ com.xkcoding
+ spring-boot-demo
+ 1.0.0-SNAPSHOT
+
+
+
+ UTF-8
+ UTF-8
+ 1.8
+
+
+
+
+ org.springframework.boot
+ spring-boot-starter
+
+
+
+ org.springframework.boot
+ spring-boot-starter-test
+ test
+
+
+
+ mysql
+ mysql-connector-java
+
+
+
+ com.baomidou
+ dynamic-datasource-spring-boot-starter
+ 2.5.0
+
+
+
+ com.baomidou
+ mybatis-plus-boot-starter
+ 3.0.7.1
+
+
+
+ org.projectlombok
+ lombok
+ true
+
+
+
+ cn.hutool
+ hutool-all
+
+
+
+ com.google.guava
+ guava
+
+
+
+
+ spring-boot-demo-multi-datasource-mybatis
+
+
+ org.springframework.boot
+ spring-boot-maven-plugin
+
+
+
+
+
+```
+
+## 准备实体类
+
+`User.java`
+
+> 1. @Data / @NoArgsConstructor / @AllArgsConstructor / @Builder 都是 lombok 注解
+> 2. @TableName("multi_user") 是 Mybatis-Plus 注解，主要是当实体类名字和表名不满足 **驼峰和下划线互转** 的格式时，用于表示数据库表名
+> 3. @TableId(type = IdType.ID_WORKER) 是 Mybatis-Plus 注解，主要是指定主键类型，这里我使用的是 Mybatis-Plus 基于 twitter 提供的 雪花算法
+
+```java
+/**
+ *
+ * User实体类
+ *
+ *
+ * @package: com.xkcoding.multi.datasource.mybatis.model
+ * @description: User实体类
+ * @author: yangkai.shen
+ * @date: Created in 2019-01-21 14:19
+ * @copyright: Copyright (c) 2019
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Data
+@TableName("multi_user")
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class User implements Serializable {
+ private static final long serialVersionUID = -1923859222295750467L;
+
+ /**
+ * 主键
+ */
+ @TableId(type = IdType.ID_WORKER)
+ private Long id;
+
+ /**
+ * 姓名
+ */
+ private String name;
+
+ /**
+ * 年龄
+ */
+ private Integer age;
+}
+```
+
+## 数据访问层
+
+`UserMapper.java`
+
+> 不需要建对应的xml，只需要继承 BaseMapper 就拥有了大部分单表操作的方法了。
+
+```java
+/**
+ *
+ * 数据访问层
+ *
+ *
+ * @package: com.xkcoding.multi.datasource.mybatis.mapper
+ * @description: 数据访问层
+ * @author: yangkai.shen
+ * @date: Created in 2019-01-21 14:28
+ * @copyright: Copyright (c) 2019
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+public interface UserMapper extends BaseMapper {
+}
+```
+
+## 数据服务层
+
+### 接口
+
+`UserService.java`
+
+```java
+/**
+ *
+ * 数据服务层
+ *
+ *
+ * @package: com.xkcoding.multi.datasource.mybatis.service
+ * @description: 数据服务层
+ * @author: yangkai.shen
+ * @date: Created in 2019-01-21 14:31
+ * @copyright: Copyright (c) 2019
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+public interface UserService extends IService {
+
+ /**
+ * 添加 User
+ *
+ * @param user 用户
+ */
+ void addUser(User user);
+}
+```
+
+### 实现
+
+`UserServiceImpl.java`
+
+> 1. @DS: 注解在类上或方法上来切换数据源，方法上的@DS优先级大于类上的@DS
+> 2. baseMapper: mapper 对象，即`UserMapper`，可获得CRUD功能
+> 3. 默认走从库: `@DS(value = "slave")`在类上，默认走从库，除非在方法在添加`@DS(value = "master")`才走主库
+
+```java
+/**
+ *
+ * 数据服务层 实现
+ *
+ *
+ * @package: com.xkcoding.multi.datasource.mybatis.service.impl
+ * @description: 数据服务层 实现
+ * @author: yangkai.shen
+ * @date: Created in 2019-01-21 14:37
+ * @copyright: Copyright (c) 2019
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Service
+@DS("slave")
+public class UserServiceImpl extends ServiceImpl implements UserService {
+
+ /**
+ * 类上 {@code @DS("slave")} 代表默认从库，在方法上写 {@code @DS("master")} 代表默认主库
+ *
+ * @param user 用户
+ */
+ @DS("master")
+ @Override
+ public void addUser(User user) {
+ baseMapper.insert(user);
+ }
+}
+```
+
+## 启动类
+
+`SpringBootDemoMultiDatasourceMybatisApplication.java`
+
+> 启动类上方需要使用@MapperScan扫描 mapper 类所在的包
+
+```java
+/**
+ *
+ * 启动器
+ *
+ *
+ * @package: com.xkcoding.multi.datasource.mybatis
+ * @description: 启动器
+ * @author: yangkai.shen
+ * @date: Created in 2019-01-21 14:19
+ * @copyright: Copyright (c) 2019
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@SpringBootApplication
+@MapperScan(basePackages = "com.xkcoding.multi.datasource.mybatis.mapper")
+public class SpringBootDemoMultiDatasourceMybatisApplication {
+
+ public static void main(String[] args) {
+ SpringApplication.run(SpringBootDemoMultiDatasourceMybatisApplication.class, args);
+ }
+
+}
+```
+
+## 配置文件
+
+`application.yml`
+
+```yaml
+spring:
+ datasource:
+ dynamic:
+ datasource:
+ master:
+ username: root
+ password: root
+ url: jdbc:mysql://127.0.0.1:3306/spring-boot-demo?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false&serverTimezone=GMT%2B8
+ driver-class-name: com.mysql.cj.jdbc.Driver
+ slave:
+ username: root
+ password: root
+ url: jdbc:mysql://127.0.0.1:3306/spring-boot-demo-2?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false&serverTimezone=GMT%2B8
+ driver-class-name: com.mysql.cj.jdbc.Driver
+ mp-enabled: true
+logging:
+ level:
+ com.xkcoding.multi.datasource.mybatis: debug
+```
+
+## 测试类
+
+```java
+/**
+ *
+ * 测试主从数据源
+ *
+ *
+ * @package: com.xkcoding.multi.datasource.mybatis.service.impl
+ * @description: 测试主从数据源
+ * @author: yangkai.shen
+ * @date: Created in 2019-01-21 14:45
+ * @copyright: Copyright (c) 2019
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Slf4j
+public class UserServiceImplTest extends SpringBootDemoMultiDatasourceMybatisApplicationTests {
+ @Autowired
+ private UserService userService;
+
+ /**
+ * 主从库添加
+ */
+ @Test
+ public void addUser() {
+ User userMaster = User.builder().name("主库添加").age(20).build();
+ userService.addUser(userMaster);
+
+ User userSlave = User.builder().name("从库添加").age(20).build();
+ userService.save(userSlave);
+ }
+
+ /**
+ * 从库查询
+ */
+ @Test
+ public void testListUser() {
+ List list = userService.list(new QueryWrapper<>());
+ log.info("【list】= {}", JSONUtil.toJsonStr(list));
+ }
+}
+```
+
+### 测试结果
+
+主从数据源加载成功
+
+```java
+2019-01-21 14:55:41.096 INFO 7239 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Starting...
+2019-01-21 14:55:41.307 INFO 7239 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Start completed.
+2019-01-21 14:55:41.308 INFO 7239 --- [ main] com.zaxxer.hikari.HikariDataSource : slave - Starting...
+2019-01-21 14:55:41.312 INFO 7239 --- [ main] com.zaxxer.hikari.HikariDataSource : slave - Start completed.
+2019-01-21 14:55:41.312 INFO 7239 --- [ main] c.b.d.d.DynamicRoutingDataSource : 初始共加载 2 个数据源
+2019-01-21 14:55:41.313 INFO 7239 --- [ main] c.b.d.d.DynamicRoutingDataSource : 动态数据源-加载 slave 成功
+2019-01-21 14:55:41.313 INFO 7239 --- [ main] c.b.d.d.DynamicRoutingDataSource : 动态数据源-加载 master 成功
+2019-01-21 14:55:41.313 INFO 7239 --- [ main] c.b.d.d.DynamicRoutingDataSource : 当前的默认数据源是单数据源，数据源名为 master
+ _ _ |_ _ _|_. ___ _ | _
+| | |\/|_)(_| | |_\ |_)||_|_\
+ / |
+ 3.0.7.1
+```
+
+**主**库 **建议** 只执行 **INSERT** **UPDATE** **DELETE** 操作
+
+
+
+**从**库 **建议** 只执行 **SELECT** 操作
+
+
+
+> 生产环境需要搭建 **主从复制**
+
+## 参考
+
+1. Mybatis-Plus 多数据源文档：https://mybatis.plus/guide/dynamic-datasource.html
+2. Mybatis-Plus 多数据源集成官方 demo：https://gitee.com/baomidou/dynamic-datasource-spring-boot-starter/tree/master/samples
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