【项目】SpringBoot +MybatisPlus集成多数据源

引言

应项目需求，需要引入另外的Mysql数据库，但是项目已经引入一个Mysql，这时有几种方案

1. 通过Dynamic-DataSource 框架，无缝集成 但是是动态切换数据源的，跟项目需求不符合，于是采取第二种
2. 通过自定义数据源配置类，无缝引入多个数据源，并且基于文件目录隔离

步骤

引入依赖

项目需要引入了MyBatis Plus即可，无需引入额外依赖

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.12</version>
</dependency>

修改配置文件

spring:
  datasource:
    d1:
      password: xxxx
      username: xxxx
      jdbc-url: jdbc:mysql://xxxx:3306/ecshop_wp?characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
      driver-class-name: com.mysql.cj.jdbc.Driver
    d2:
      password: root
      username: root
      jdbc-url: jdbc:mysql://127.0.0.1:3306/xg_bi_lcc?characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
      driver-class-name: com.mysql.cj.jdbc.Driver

添加配置类

@Configuration
@MapperScan(basePackages = "xg.xx.model.front.service.mysql.mapper1", sqlSessionFactoryRef = "d1SqlSessionFactory")
public class EcshopWpDataSourceConfig {

    @Bean(name = "d1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.d1")
    public DataSource ecshopWpDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "d1SqlSessionFactory")
    public SqlSessionFactory ecshopWpSqlSessionFactory(@Qualifier("d1DataSource") DataSource dataSource) throws Exception {
        MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
        //configuration配置bean
        //MybatisConfiguration configuration = new MybatisConfiguration();
        //configuration.setMapUnderscoreToCamelCase(true);
        //configuration.setCacheEnabled(false);
        // 配置打印sql语句s
        //configuration.setLogImpl(StdOutImpl.class);
        // 添加自定义SQL注入
        //bean.setConfiguration(configuration);

        //插件对象
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        //动态表名
        //DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
        //可以传多个表名参数，指定哪些表使用MonthTableNameHandler处理表名称
        //dynamicTableNameInnerInterceptor.setTableNameHandler(new MonthTableNameHandler("t_table_name"));
        //以拦截器的方式处理表名称
        //可以传递多个拦截器，即：可以传递多个表名处理器TableNameHandler
        //mybatisPlusInterceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);


        //分页插件
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        bean.setDataSource(dataSource);
        // 设置mybatis的xml所在位置
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/d1/*.xml"));
        bean.setPlugins(mybatisPlusInterceptor);
        return bean.getObject();
    }

    @Bean(name = "d1TransactionManager")
    public DataSourceTransactionManager ecshopWpTransactionManager(@Qualifier("d1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

@Configuration
@MapperScan(basePackages = "xg.xx.model.front.service.mysql.Mapper2", sqlSessionFactoryRef = "d2SqlSessionFactory")
public class XgBiLccDataSourceConfig {

    @Bean(name = "d2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.d2")
    public DataSource ecshopWpDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "d2SqlSessionFactory")
    public SqlSessionFactory ecshopWpSqlSessionFactory(@Qualifier("d2DataSource") DataSource dataSource) throws Exception {
        MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
        //configuration配置bean
        //MybatisConfiguration configuration = new MybatisConfiguration();
        //configuration.setMapUnderscoreToCamelCase(true);
        //configuration.setCacheEnabled(false);
        // 配置打印sql语句s
        //configuration.setLogImpl(StdOutImpl.class);
        // 添加自定义SQL注入
        //bean.setConfiguration(configuration);

        //插件对象
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        //动态表名
        //DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
        //可以传多个表名参数，指定哪些表使用MonthTableNameHandler处理表名称
        //dynamicTableNameInnerInterceptor.setTableNameHandler(new MonthTableNameHandler("t_table_name"));
        //以拦截器的方式处理表名称
        //可以传递多个拦截器，即：可以传递多个表名处理器TableNameHandler
        //mybatisPlusInterceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);


        //分页插件
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        bean.setDataSource(dataSource);
        // 设置mybatis的xml所在位置
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/d2/*.xml"));
        bean.setPlugins(mybatisPlusInterceptor);
        return bean.getObject();
    }

    @Bean(name = "d2TransactionManager")
    public DataSourceTransactionManager ecshopWpTransactionManager(@Qualifier("d2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

使用案例

@Transactional

@Transactional(value = "d2TransactionManager", rollbackFor = Exception.class)
这样即可进行全局事物管理