insert into TABLE (col1,col2) VALUES (val1,val2) ON DUPLICATE KEY update col1 = "val1"; 

spring:
  application:
    name: CONNECTION
  datasource:
    db1:
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC
      username: root
      password: 123456
      type: com.alibaba.druid.pool.DruidDataSource
    db2:
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://11.11.11.11:3306/test?serverTimezone=UTC
      username: root
      password: 654321
      type: com.alibaba.druid.pool.DruidDataSource

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.czf.connect.mapper.db1", sqlSessionTemplateRef  = "db1SqlSessionTemplate")
//此處的basePackages指向的是你存放數(shù)據(jù)庫(kù)db1的mapper的包
public class DataSource1Config {

    @Bean(name = "db1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.db1")//指向yml配置文件中的數(shù)據(jù)庫(kù)配置
    @Primary    //主庫(kù)加這個(gè)注解，修改優(yōu)先權(quán)，表示發(fā)現(xiàn)相同類型bean，優(yōu)先使用該方法。
    public DataSource dbDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "db1SqlSessionFactory")
    @Primary
    public SqlSessionFactory dbSqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*xml"));
        //這個(gè)的getResources指向的是你的mapper.xml文件，相當(dāng)于在yml中配置的mapper-locations，此處配置了yml中就不用配置，或者說(shuō)不會(huì)讀取yml中的該配置。
        return bean.getObject();
    }

    @Bean(name = "db1TransactionManager")
    @Primary
    public DataSourceTransactionManager dbTransactionManager(@Qualifier("db1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db1SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate dbSqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

@Configuration
@MapperScan(basePackages = "com.czf.connect.mapper.db2", sqlSessionTemplateRef  = "db2SqlSessionTemplate")
public class DataSource2Config {

    @Bean(name = "db2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.db2")
    public DataSource dbDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "db2SqlSessionFactory")
    public SqlSessionFactory dbSqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*xml"));
        return bean.getObject();
    }

    @Bean(name = "db2TransactionManager")
    public DataSourceTransactionManager dbTransactionManager(@Qualifier("db2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db2SqlSessionTemplate")
    public SqlSessionTemplate dbSqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

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

spring:
  datasource:
    dynamic:
      primary: mysql1 #設(shè)置默認(rèn)的數(shù)據(jù)源或者數(shù)據(jù)源組,默認(rèn)值即為mysql1
      strict: false #嚴(yán)格匹配數(shù)據(jù)源,默認(rèn)false. true未匹配到指定數(shù)據(jù)源時(shí)拋異常,false使用默認(rèn)數(shù)據(jù)源
      datasource:
        mysql1:
          url: jdbc:mysql://xx.xx.xx.xx:3306/dynamic
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver # 3.2.0開(kāi)始支持SPI可省略此配置
        mysql2:
          url: jdbc:mysql://xx.xx.xx.xx:3307/dynamic
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver
        mysql2:
          url: ENC(xxxxx) # 內(nèi)置加密,使用請(qǐng)查看詳細(xì)文檔
          username: ENC(xxxxx)
          password: ENC(xxxxx)
          driver-class-name: com.mysql.jdbc.Driver
       #......省略

@Service
@DS("mysql1")
public class UserServiceImpl implements UserService {

  @Autowired
  private JdbcTemplate jdbcTemplate;

  public List selectAll() {
    return  jdbcTemplate.queryForList("select * from user");
  }
  
  @Override
  @DS("mysql2")
  public List selectByCondition() {
    return  jdbcTemplate.queryForList("select * from user where age >10");
  }
}

@RequestMapping("/Bmetohd")
public int Bmethod(){
    DynamicDataSourceContextHolder.push("mysql1");
    List<User> users = Amethod();
    DynamicDataSourceContextHolder.poll();
    DynamicDataSourceContextHolder.push("mysql2");
    int num = 0;
    for(User user: users){
        int i = User2Mapper.insert(user);
        num += i;
    }
    DynamicDataSourceContextHolder.poll();
    return num;
}

DynamicDataSourceContextHolder.push("mysql1");
//業(yè)務(wù)代碼
DynamicDataSourceContextHolder.poll();