【实战干货】SpringBoot整合多数据源

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.13</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.4.5</version>
        </dependency>

# 项目启动端口
server:
  port: 9090
# 项目 名称
spring:
  application:
    name: multi-datasource-instance
  datasource:
    # 主数据库
    master:
      # 注意，整合多数据源时如果使用springboot默认的数据库连接池Hikari，指定连接数据使用的是jdbc-url而不是url属性
      jdbc-url: jdbc:mysql://localhost:3306/test1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
      username: root
      password: 123456
      driver-class-name: com.mysql.cj.jdbc.Driver
    # 副数据库
    slave:
      # 注意，整合多数据源时如果使用springboot默认的数据库连接池Hikari，指定连接数据使用的是jdbc-url而不是url属性
      jdbc-url: jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
      username: root
      password: 123456
      driver-class-name: com.mysql.cj.jdbc.Driver

@Configuration
// 指定主数据库扫描对应的Mapper文件，生成代理对象
@MapperScan(basePackages ="com.diary.it.multi.datasource.mapper" ,sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDataSourceConfig {
    // mapper.xml所在地址
    private static final String MAPPER_LOCATION = "classpath*:mapper/*.xml";
    /**
     * 主数据源，Primary注解必须增加，它表示该数据源为默认数据源
     * 项目中还可能存在其他的数据源，如获取时不指定名称，则默认获取这个数据源，如果不添加，则启动时候回报错
     */
    @Primary
    @Bean(name = "masterDataSource")
    // 读取spring.datasource.master前缀的配置文件映射成对应的配置对象
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSource dataSource() {
        DataSource build = DataSourceBuilder.create().build();
        return build;
    }
    /**
     * 事务管理器，Primary注解作用同上
     */
    @Bean(name = "masterTransactionManager")
    @Primary
    public PlatformTransactionManager dataSourceTransactionManager(@Qualifier("masterDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
    /**
     * session工厂，Primary注解作用同上
     */
    @Bean(name = "masterSqlSessionFactory")
    @Primary
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource);
        sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MasterDataSourceConfig.MAPPER_LOCATION));
        return sessionFactoryBean.getObject();
    }
}

@Configuration
// 指定从数据库扫描对应的Mapper文件，生成代理对象
@MapperScan(basePackages = "com.diary.it.multi.datasource.mapper2", sqlSessionFactoryRef = "slaveSqlSessionFactory")
public class SlaveDataSourceConfig {
    // mapper.xml所在地址
    private static final String MAPPER_LOCATION = "classpath*:mapper2/*.xml";
    /**
     * 数据源
     */
    @Bean(name = "slaveDataSource")
    // 读取spring.datasource.slave前缀的配置文件映射成对应的配置对象
    @ConfigurationProperties(prefix = "spring.datasource.slave")
    public DataSource dataSource() {
        DataSource build = DataSourceBuilder.create().build();
        return build;
    }
    /**
     * 事务管理器
     */
    @Bean(name = "slaveTransactionManager")
    public PlatformTransactionManager dataSourceTransactionManager(@Qualifier("slaveDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
    /**
     * session工厂
     */
    @Bean(name = "slaveSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("slaveDataSource") DataSource dataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource);
        sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(SlaveDataSourceConfig.MAPPER_LOCATION));
        return sessionFactoryBean.getObject();
    }
}

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.4.5</version>
        </dependency>

# 启动端口
server:
  port: 9091
# 项目名称
spring:
  application:
    name: multi-datasource-instance2
  datasource:
    # 采用动态选取
    dynamic:
      primary: master #设置默认的数据源或者数据源组,默认值即为master
      strict: false #严格匹配数据源,默认false. true未匹配到指定数据源时抛异常,false使用默认数据源
      datasource:
        # 主数据库
        master:
          url: jdbc:mysql://localhost:3306/test1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
          username: root
          password: 123456
          driver-class-name: com.mysql.cj.jdbc.Driver
        # 副数据库
        slave:
          url: jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
          username: root
          password: 123456
          driver-class-name: com.mysql.cj.jdbc.Driver