SpringBoot配置多个数据源

最新推荐文章于 2025-06-30 17:58:01 发布

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本文详细讲解如何在SpringBoot应用中配置主从数据源，强调主数据库需使用@Primary注解的重要性，帮助开发者实现高效的数据读写分离。

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数据库配置信息

server:
  port: 8080

spring:  
  datasource:
    master:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
      username: root
      password: 123456
    slaver:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/dev?useUnicode=true&characterEncoding=utf-8&useSSL=false
      username: root
      password: 123456

mybatis:
  #mapper-locations: classpath*:/mapper/**/*.xml
  type-handlers-package: com.jx.smart.admin.config
  configuration:
    map-underscore-to-camel-case: true

主从数据库配置，主数据库一定要使用@Primary注解

@Configuration
@MapperScan(basePackages = "com.somta.springboot.dao.master", sqlSessionTemplateRef  = "masterSqlSessionTemplate")
public class MasterDataSourceConfiguration {

    @Value("${spring.datasource.master.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.master.url}")
    private String url;

    @Value("${spring.datasource.master.username}")
    private String username;

    @Value("${spring.datasource.master.password}")
    private String password;

    @Value("${mybatis.type-handlers-package}")
    private String typeHandlersPackage

    @Value("${mybatis.configuration.map-underscore-to-camel-case}")
    private Boolean mapUnderscoreToCamelCase

    @Bean(name = "masterDataSource")
    @Primary
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(this.driverClassName);
        dataSource.setUrl(this.url);
        dataSource.setUsername(this.username);
        dataSource.setPassword(this.password);
        return dataSource;
    }

    @Bean(name = "masterSqlSessionFactory")
    @Primary
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/master/**/Mysql_*Mapper.xml"));
        bean.setTypeHandlersPackage(typeHandlersPackage);
        org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
        configuration.setMapUnderscoreToCamelCase(mapUnderscoreToCamelCase);
        bean.setConfiguration(configuration);
        return bean.getObject();
    }

    @Bean(name = "masterTransactionManager")
    @Primary
    public DataSourceTransactionManager transactionManager(@Qualifier("masterDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "masterSqlSessionTemplate")
    @Primary
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("masterSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

@Configuration
@MapperScan(basePackages = "com.somta.springboot.dao.slaver", sqlSessionTemplateRef  = "slaverSqlSessionTemplate")
public class SlaverDataSourceConfiguration {

    @Value("${spring.datasource.slaver.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.slaver.url}")
    private String url;

    @Value("${spring.datasource.slaver.username}")
    private String username;

    @Value("${spring.datasource.slaver.password}")
    private String password;

    @Value("${mybatis.type-handlers-package}")
    private String typeHandlersPackage

    @Value("${mybatis.configuration.map-underscore-to-camel-case}")
    private Boolean mapUnderscoreToCamelCase


    @Bean(name = "slaverDataSource")
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(this.driverClassName);
        dataSource.setUrl(this.url);
        dataSource.setUsername(this.username);
        dataSource.setPassword(this.password);
        return dataSource;
    }

    @Bean(name = "slaverSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("slaverDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/slaver/**/Mysql_*Mapper.xml"));
        bean.setTypeHandlersPackage(typeHandlersPackage);
        org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
        configuration.setMapUnderscoreToCamelCase(mapUnderscoreToCamelCase);
        bean.setConfiguration(configuration);
        return bean.getObject();
    }

    @Bean(name = "slaverTransactionManager")
    public DataSourceTransactionManager transactionManager(@Qualifier("slaverDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "slaverSqlSessionTemplate")
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("slaverSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}