多数据源简单配置(dynamic-datasource组件+MyBatis)-快速上手系列

Posted 2022-10-07 Fire king

多数据源简单配置：dynamic-datasource组件+MyBatis实现

• • 1.需要引入的依赖
  • 2.配置文件多数据源配置
  • 3.实现类（核心）
  • 4.mapper映射文件
  • 5.controller
  • 6.访问效果图

1.需要引入的依赖

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

2.配置文件多数据源配置

spring:
  datasource:
    dynamic:
      primary: master #设置默认的数据源或者数据源组,默认值即为master
      strict: false #设置严格模式,默认false不启动. 启动后在未匹配到指定数据源时候会抛出异常,不启动则使用默认数据源.
      datasource:
        master:
          url: jdbc:mysql://localhost:3306/MasterDB?serverTimezone=Asia/Shanghai
          username: root
          password: root
          driver-class-name: com.mysql.jdbc.Driver # 3.2.0开始支持SPI可省略此配置
        slave_1:
          url: jdbc:mysql://localhost:3306/SlaveDB1?serverTimezone=Asia/Shanghai
          username: root
          password: root
          driver-class-name: com.mysql.jdbc.Driver


# mybatis配置
mybatis:
  # 搜索指定包别名
  typeAliasesPackage: test.module
  # 配置mapper的扫描，找到所有的mapper.xml映射文件
  mapperLocations: classpath:mappers/*.xml

3.实现类（核心）

@DS(“xxx”)的名字要与配置文件配置的数据源名称相同，即spring.datasource.dynamic.datasource下的数据源名称。

@Service
@Transactional
public class UserServiceImpl implements UserService 

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    @DS("master")
    public List selectAllWithMaster() 
        return userMapper.selectAllWithMaster();

    

    @Override
    @DS("slave_1")
    public List selectAllWithSlave() 
        return userMapper.selectAllWithSlave();
    

4.mapper映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test.mapper.UserMapper">

    <select id="selectAllWithMaster" resultType="test.module.User">
        select * from  t_user
    </select>

    <select id="selectAllWithSlave" resultType="test.module.User">
        select * from t_user
    </select>
</mapper>

5.controller

@RestController
public class ThirdPartyFrameworksController 
    @Autowired
    private UserService userServic;
    @RequestMapping("/selectAllUser")
    public List<User> selectAllUser() 
        return userServic.selectAllWithSlave();
        //return userServic.selectAllWithMaster();
    

6.访问效果图