MyBatis-Flex入门以及多数据源配置
1、创建一个springboot项目，并添加 Maven 依赖
需要添加的 Maven 主要依赖示例：
java
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.mybatis-flex</groupId>
<artifactId>mybatis-flex-spring-boot-starter</artifactId>
<version>1.11.5</version>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
</dependency>
<!-- for test only -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>注意： 如果您当前使用的是 SpringBoot v3.x 版本，需要把依赖 mybatis-flex-spring-boot-starter 修改为：mybatis-flex-spring-boot3-starter, 如下代码所示：
java
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>compile</scope>
</dependency>
<!--springboot3 mybatis-flex相关依赖 -->
<dependency>
<groupId>com.mybatis-flex</groupId>
<artifactId>mybatis-flex-spring-boot3-starter</artifactId>
<version>1.11.1</version>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>2、修改application.yml配置
java
# DataSource Config
mybatis:
flex:
datasource:
#主数据源配置 (这里以mysql为例)
ds1:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/fbpt
username: root
password: 123456
#从数据源配置 (这里以mysql为例,其他db)
ds2:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/meeting_db
username: root
password: 123456在 Spring Boot 启动类中添加 @MapperScan 注解，扫描 Mapper 文件夹：
java
@SpringBootApplication
@MapperScan("cn.com.markly.mybatis_flex_demo.mapper")
public class MybatisFlexDemoApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisFlexDemoApplication.class, args);
}
}3、数据库分别创建测试表
数据库fbpt
java
CREATE TABLE IF NOT EXISTS `tb_account`
(
`id` INTEGER PRIMARY KEY auto_increment,
`user_name` VARCHAR(100),
`age` INTEGER,
`birthday` DATETIME
);
INSERT INTO tb_account(id, user_name, age, birthday)
VALUES (1, '张三ds1', 18, '2020-01-11'),
(2, '李四ds1', 19, '2021-03-21');数据库meeting_db
java
CREATE TABLE IF NOT EXISTS `tb_account`
(
`id` INTEGER PRIMARY KEY auto_increment,
`user_name` VARCHAR(100),
`age` INTEGER,
`birthday` DATETIME
);
INSERT INTO tb_account(id, user_name, age, birthday)
VALUES (1, '张三ds2', 18, '2020-01-11'),
(2, '李四ds2', 19, '2021-03-21');4、编写实体类和 Mapper 接口
这里使用了 Lombok 来简化代码。
java
@Data
@Table("tb_account")
public class Account {
@Id(keyType = KeyType.Auto)
private Long id;
private String userName;
private Integer age;
private Date birthday;
}使用 @Table("tb_account") 设置实体类与表名的映射关系
使用 @Id(keyType = KeyType.Auto) 标识主键为自增
Mapper 接口继承 BaseMapper 接口：
java
public interface AccountMapper extends BaseMapper<Account> {
}生成对应的service层、controller层
5、编写测试代码进行测试
java
@RestController
public class AccountController {
@Autowired
private AccountService accountService;
//查询主数据库
@RequestMapping("/getAccountPage")
public Page<Account> getAccountPage(){
return accountService.selectPage(1, 10);
}
//查询ds2数据库
@RequestMapping("/getAccountPageDS2")
public Page<Account> getAccountPageDS2(){
return accountService.getAccountPageDS2(1, 10);
}
}
java
@Service
public class AccountServiceImpl extends ServiceImpl<AccountMapper, Account> implements AccountService {
@Autowired
private AccountMapper accountMapper;
@Override //没有@UseDataSource注解默认使用ds1主数据源
public Page<Account> selectPage(int page, int size) {
Page<Account> accountPage = new Page<>(page,size);
QueryWrapper queryWrapper = QueryWrapper.create();
queryWrapper.eq("id", 1);
Page<Account> paginate = accountMapper.paginate(accountPage, queryWrapper);
return paginate;
}
@Override
@UseDataSource("ds2")//指定ds2数据源
public Page<Account> getAccountPageDS2(int page, int size) {
Page<Account> accountPage = new Page<>(page,size);
QueryWrapper queryWrapper = QueryWrapper.create();
queryWrapper.eq("id", 2);
Page<Account> paginate = accountMapper.paginate(accountPage, queryWrapper);
return paginate;
}
}在service层、mapper层方法上使用@UseDataSource注解即可指定数据源
6、调用方法进行测试
调用getAccountPage方法查询ds1主数据库结果：
调用getAccountPageDS2方法查询ds2主数据库结果：
