主要依赖包 spring-boot-starter-web mybatis-plus-boot-starter dynamic-datasource-spring-boot-starter # 配置动态数据源 druid-spring-boot-starter # 阿里的数据库连接池 mysql-connector-java lombok
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.2</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
yml
server:
port: 8080
spring:
datasource:
dynamic:
primary: db1 #配置默认数据库
datasource:
db1: # 数据源1配置
url: jdbc:mysql://localhost:3306/yogurt?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=GMT%2B8
username: root
password: creation
driver-class-name: com.mysql.cj.jdbc.Driver
db2: # 数据源2配置
url: jdbc:mysql://localhost:3306/db01?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=GMT%2B8
username: root
password: creation
driver-class-name: com.mysql.cj.jdbc.Driver
durid:
initial-size: 1
max-active: 20
min-idle: 1
max-wait: 60000
autoconfigure:
exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure # # 去除druid配置
mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #
DruidDataSourceAutoConfigure会注入一个DataSourceWrapper,其会在原生的spring.datasource下找 url, username, password 等。动态数据源 URL 等配置是在 dynamic 下,因此需要排除,否则会报错。排除方式有两种,一种是上述配置文件排除,还有一种可以在项目启动类排除:
@SpringBootApplication(exclude = DruidDataSourceAutoConfigure.class)
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
给使用非默认数据源添加注解@DS @DS 可以注解在方法上和类上,同时存在方法注解优先于类上注解。 注解在 service 实现或 mapper 接口方法上,不要同时在 service 和 mapper 注解。
@Repository
@DS("db2")
public interface User2Mapper extends BaseMapper<User2> {
}
@Select("SELECT * FROM user")
@DS("db2")
List<User> selectAll();
测试过程中出现的问题:
字段映射报错
现象: 集成druid数据源,使用3.1.0之前版本没问题,升级mp到3.1.1+后,运行时报错:java.sql.SQLFeatureNotSupportedException
原因: mp3.1.1+使用了新版jdbc,LocalDateTime等新日期类型处理方式升级,但druid在1.1.21版本之前不支持,参考issue
解决方案: 1. 升级druid到1.1.21解决这个问题;2.保持mp版本3.1.0;3.紧跟mp版本,换掉druid数据源
测试结果:
查阅的相关文档:http://t.zoukankan.com/zhazhaacmer-p-12197988.html https://blog.csdn.net/qq_42981242/article/details/110246103