@[TOC]

SpringBoot配置多数据源实战

需求来源：

当相关业务场景想实现同时操作2个甚至多个不同数据库表的时候，就需要配置多个数据源。

简单粗暴3步使用步骤：

1.修改包名结构
2.application.properties配置2套数据源，注意加前缀
3.修改DataSourceOmniConfig里面的注解@MapperScan和@Bean(name = "transactionManager")即可，其他不用改可直接使用

思路讲解：

springboot默认支持一个数据库，所以可简写（具体参照自己项目即可），但是当想实现配置多数据源的时候，application.properties配置文件需要修改前缀，用于自定义工厂进行扫描产生Bean

目录结构：

使用注意点：

DataSourceOmniConfig

package com.geespace.omni.datasource;

import javax.sql.DataSource;

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.jdbc.datasource.DataSourceTransactionManager;

/**
 * 表示这个类为一个配置类,配置Mybatis的接口类放的地方
 * @author: liudz
 * @date: 2020/8/13
 */
@Configuration
@MapperScan(basePackages = "com.geespace.omni.dao.database1", sqlSessionFactoryRef = "db01SqlSessionFactory")
public class DataSourceOmniConfig {

    /**
     * 将这个对象放入Spring容器中,读取application.properties中的配置参数映射成为一个对象,prefix表示参数的前缀
     * @author: liudz
     * @date: 2020/8/13
     * @return 执行结果
     */
    @Bean(name = "db01DataSource")
    @ConfigurationProperties(prefix = "spring.datasource01")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 将这个对象放入Spring容器中
     * @param dataSource dataSource
     * @author: liudz
     * @date: 2020/8/13
     * @return 执行结果
     * @throws Exception Exception
     */
    @Bean(name = "db01SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("db01DataSource") DataSource dataSource)
          throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource((dataSource));
        return bean.getObject();
    }

    /**
     * 将这个对象放入Spring容器中
     * @param dataSource dataSource
     * @author: liudz
     * @date: 2020/8/13
     * @return 执行结果
     * @throws Exception Exception
     */
    @Bean(name = "transactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("db01DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    /**
     * 将这个对象放入Spring容器中
     * @param sqlSessionFactory sqlSessionFactory
     * @author: liudz
     * @date: 2020/8/13
     * @return 执行结果
     * @throws Exception Exception
     */
    @Bean(name = "db01SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(
        @Qualifier("db01SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

DataSourcePlatformConfig

package com.geespace.omni.datasource;

import javax.sql.DataSource;

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.jdbc.datasource.DataSourceTransactionManager;


/**
 * 表示这个类为一个配置类, 配置Mybatis的接口类放的地方
 * @author: liudz
 * @date: 2020/8/13
 */
@Configuration
@MapperScan(basePackages = "com.geespace.omni.dao.database2", sqlSessionFactoryRef = "db02SqlSessionFactory")
public class DataSourcePlatformConfig {

    /**
     *
     * @author liudz
     * @date 2020/8/13
     * @return 执行结果
     **/
    @Bean(name = "db02DataSource")
    @ConfigurationProperties(prefix = "spring.datasource02")
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * @param dataSource dataSource
     * @author liudz
     * @date 2020/8/13
     * @return 执行结果
     * @throws Exception Exception
     **/
    @Bean(name = "db02SqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("db02DataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource((dataSource));
        return bean.getObject();
    }

    /**
     * @param dataSource dataSource
     * @author liudz
     * @date 2020/8/13
     * @return 执行结果
     **/
    @Bean(name = "db02TransactionManager")
    public DataSourceTransactionManager testTransactionManager(@Qualifier("db02DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    /**
     * @param sqlSessionFactory sqlSessionFactory
     * @author liudz
     * @date 2020/8/13
     * @return 执行结果
     * @throws Exception Exception
     **/
    @Bean(name = "db02SqlSessionTemplate")
    public SqlSessionTemplate testSqlSessionTemplate(
            @Qualifier("db02SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}