SpringBoot的Web项目Mybatis-plus多数据源

1、pom.xml依赖

①、Web项目跑起来：只需要 spring-boot-starter-web 【包含：tomcat、webmvc框架、Jackson、spring-boot-starter】

②、这里添加了：打包插件、测试依赖、mysql连接、mybatis-plus 使用及多数据源

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.manmanqiu</groupId>
    <artifactId>asdasdas</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!--对全栈web开发的支持，包括Tomcat和spring-webmvc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.7.18</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.0</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>3.5.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.7.18</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2、application.yml

server:
  port: 9003

spring:
  datasource:
    dynamic:
      primary: master
      strict: false
      datasource:
        master:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://localhost:3306/lottery?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
          username: root
          password: 123456
        slave_01:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://localhost:3306/bank?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
          username: root
          password: 123456

mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3、切换数据源：使用@DS 注解

如果是测试：那么【Mapper层】 标注@DS， 注意如果是Service层控制切换数据源，就标Service层。

• 此处：Service层控制

@Service
@DS("slave_01")
public class TActServiceImpl extends ServiceImpl<TActMapper, TAct> implements ITActService {

}

• @Test 测试类：标注了没有用。

    @Test
    public void test05(){
        List<TAct> list = actService.list();
        list.forEach(System.out::println);
    }