一、多数据源

1、创建数据库和表

CREATE DATABASE `mybatis_plus_1` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;
use `mybatis_plus_1`;
CREATE TABLE product
(
id BIGINT(20) NOT NULL COMMENT '主键ID',
name VARCHAR(30) NULL DEFAULT NULL COMMENT '商品名称',
price INT(11) DEFAULT 0 COMMENT '价格',
version INT(11) DEFAULT 0 COMMENT '乐观锁版本号',
PRIMARY KEY (id)
);
INSERT INTO product (id, NAME, price) VALUES (1, '外星人笔记本', 100);

2、导入依赖

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

3、配置多数据源

spring:
  datasource:
    dynamic:
      # 设置默认的数据源或者数据源组,默认值即为master
      primary: master
      # 严格模式匹配数据源 默认为false true表示没匹配到数据源抛出异常
      strict: false
      datasource:
        master:
          url: jdbc:mysql://localhost:3306/mybatis_plus?characterEncoding=utf-8&useSSL=false
          driver-class-name: com.mysql.cj.jdbc.Driver
          username: root
          password: 123
        slave_1:
          url: jdbc:mysql://localhost:3306/mybatis_plus_1?characterEncoding=utf-8&useSSL=false
          driver-class-name: com.mysql.cj.jdbc.Driver
          username: root
          password: 123

4、创建实体类以及接口

import lombok.Data;

@Data
public class Product {
    private Integer id;

    private String name;

    private Integer price;

    private Integer version;
}

package com.atguigu.mybatisplus.pojo;

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("t_user")
public class User {
    @TableId
    private Integer uid;

    private String userName;

    private Integer age;

    private Integer sex;

    private String email;

    private Integer ready_delete;
}

import com.atguigu.mybatisplus.pojo.Product;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;

@Repository
public interface ProductMapper extends BaseMapper<Product> {
}

package com.atguigu.mybatisplus.mapper;

import com.atguigu.mybatisplus.pojo.User;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;

@Repository
public interface UserMapper extends BaseMapper<User> {
}

5、创建用户Service

public interface UserService extends IService<User> {
}

@Service
@DS("master") //指定使用的数据源
public class UserServiceImpl extends ServiceImpl<UserMapper,User> implements UserService {
}

6、创建商品Service

public interface ProductService extends IService<Product> {
}

@Service
@DS("slave_1")
public class ProductServiceImpl extends ServiceImpl<ProductMapper,Product> implements ProductService {
}

7、测试

@SpringBootTest
public class MybatisPlusMultiDataSourceTest {
    @Autowired
    private UserService userService;

    @Autowired
    private ProductService productService;
    @Test
    public void testDynamicDataSource(){
        System.out.println(userService.getById(1L));
        System.out.println(productService.getById(1L));
    }
}