springboot如何連接兩個數據庫(多個)

更新時間：2022年01月25日 11:54:35 作者：wuyuanshun

這篇文章主要介紹了springboot如何連接兩個數據庫(多個)，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

一、啟動類

1.啟動類需要不用加mybatis的@MapperScan注解

@SpringBootApplication
public class AppPush {
? ? public static void main(String[] args) {
? ? ? ? SpringApplication.run(AppPush.class,args);
? ? }
}

二、application.yml文件

配置倆個或多個數據庫連接，我這里用的是postgresql，用mysql等也是一樣

spring:
? datasource:
# ? ?driver-class-name: org.postgresql.Driver
# ? ?url: jdbc:postgresql://127.0.0.1/aaa
# ? ?username: root
# ? ?password: root
? ? ? one:
? ? ? ? driver-class-name: org.postgresql.Driver
? ? ? ? url: jdbc:postgresql://127.0.0.1/aaa
? ? ? ? username: root
? ? ? ? password: root
? ? ? two:
? ? ? ? driver-class-name: org.postgresql.Driver
? ? ? ? url: jdbc:postgresql://127.0.0.1/bbb
? ? ? ? username: root
? ? ? ? password: root

三、創(chuàng)建配置類

1.注意：@MapperScan 的basePackages就是你包的路徑，

sqlSessionFactoryRef 可以隨便起名但是著兩個類不能重復！

One配置類

package com.wys.config;
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.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
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.DriverManagerDataSource;
import javax.sql.DataSource;
/**
 * @program:  
 * @description: 數據庫配置1
 * @author: wys
 * @create: 2019-12-03 16:20
 **/
@Configuration
@MapperScan(basePackages = "com.wys.mapper.**", sqlSessionFactoryRef = "oneSqlSessionFactory")
public class OneDataSourceConfig {
    @Value("${spring.datasource.one.driver-class-name}")
    String driverClass;
    @Value("${spring.datasource.one.url}")
    String url;
    @Value("${spring.datasource.one.username}")
    String userName;
    @Value("${spring.datasource.one.password}")
    String passWord;
    @Primary
    @Bean(name = "oneDataSource")
    @ConfigurationProperties("spring.datasource.one")
    public DataSource masterDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(userName);
        dataSource.setPassword(passWord);
        return dataSource;
    }
    @Bean(name = "oneSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("oneDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource);
        sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath:mybatis/mapper-postgre/*.xml"));        
        return sessionFactoryBean.getObject();
    }
    @Bean(name = "oneSqlSessionTemplate")
    public SqlSessionTemplate sqlSessionFactoryTemplate(@Qualifier("oneSqlSessionFactory")SqlSessionFactory sqlSessionFactory ) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

Two配置類

package com.wys.config;
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.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
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.DriverManagerDataSource;
import javax.sql.DataSource;
/**
 * @program:  
 * @description: 數據庫配置2
 * @author: wys
 * @create: 2019-12-03 17:03
 **/
@Configuration
@MapperScan(basePackages = "com.wys.mappers",sqlSessionFactoryRef = "twoSqlSessionFactory")
public class TwoDataSourceConfig {
    @Value("${spring.datasource.two.driver-class-name}")
    String driverClass;
    @Value("${spring.datasource.two.url}")
    String url;
    @Value("${spring.datasource.two.username}")
    String userName;
    @Value("${spring.datasource.two.password}")
    String passWord;
    
    @Bean(name = "twoDataSource")
    @ConfigurationProperties("spring.datasource.two")
    public DataSource masterDataSource(){
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(userName);
        dataSource.setPassword(passWord);
        return dataSource;
    }
    @Bean(name = "twoSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("twoDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource);
        sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath:mybatis/mapper-postgres/*.xml"));         
        return sessionFactoryBean.getObject();
    }
    
    @Bean(name = "twoSqlSessionTemplate")
    public SqlSessionTemplate sqlSessionFactoryTemplate(@Qualifier("twoSqlSessionFactory")SqlSessionFactory sqlSessionFactory ) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}