SpringBoot超详细讲解多数据源集成

2022-11-13 08:11:04 集成讲解详细

一、多数据源使用场景与弊端

1.场景

业务系统跨数据库
数据转存（这个现在太low了，应该高级点都不用）
系统集成

2.弊端

跨库业务事务问题
service、dao不能重复注入数据源

二、使用步骤

1.引入库

<!-- 多数据源支持 -->
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
      <version>3.3.6</version>
    </dependency>

2.多数据源配置文件

#数据源配置
spring:
application:
name: olap
datasource:
dynamic:
primary: target
target:
jdbc-url: jdbc:Mysql://192.168.1.101:15051/db1?useUnicode=true&characterEncoding=utf8&useSSL=true&allowPublicKeyRetrieval=true&serverTimezone=GMT%2B8
username: root
passWord: 123
driver-class-name: com.mysql.jdbc.Driver
source1:
jdbc-url: jdbc:mysql://192.168.102:15052/db2?useUnicode=true&characterEncoding=utf8&useSSL=true&allowPublicKeyRetrieval=true&serverTimezone=GMT%2B8
username: admin
password: 456
driver-class-name: com.mysql.jdbc.Driver

3.多数据源配置类

数据源1

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatfORMTransactionManager;
@Configuration
@MapperScan(basePackages = "com.easylinkin.dc.mapper.source1", sqlSessionFactoryRef = "source1SqlSessionFactory")
public class Source1DataSourceConfig {
  // mapper.xml所在地址
  private static final String MAPPER_LOCATION = "classpath*:mapper/business/source1
  @Bean(name = "source1DataSource")
  @ConfigurationProperties(prefix = "spring.datasource.source1")
  public DataSource dataSource() {
    DataSource build = DataSourceBuilder.create().build();
    return build;
  }
  
  @Bean(name = "source1TransactionManager")
  public PlatformTransactionManager dataSourceTransactionManager(
      @Qualifier("source1DataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }
  
  @Bean(name = "source1SqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(@Qualifier("source1DataSource") DataSource dataSource)
      throws Exception {
  
    //不使用下面这个无法使用mybatis-plus提供的BaseMapper中的方法，需要增加mybatis-plus 的拓展依赖
    MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    //不在这里注入分页插件，会失效
    //bean.setPlugins(new PaginationInterceptor[]{new PaginationInterceptor()});
    return bean.getObject();
  }
}

数据源2

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
@Configuration
@MapperScan(basePackages = "com.easylinkin.dc.mapper.target", sqlSessionFactoryRef = "targetSqlSessionFactory")
public class TargetDataSourceConfig {
  // mapper.xml所在地址
  private static final String MAPPER_LOCATION = "classpath*:mapper/business/target
  @Primary
  @Bean(name = "targetDataSource")
  @ConfigurationProperties(prefix = "spring.datasource.target")
  public DataSource dataSource() {
    DataSource build = DataSourceBuilder.create().build();
    return build;
  }
  
  @Bean(name = "masterTransactionManager")
  @Primary
  public PlatformTransactionManager dataSourceTransactionManager(
      @Qualifier("targetDataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }
  
  @Bean(name = "targetSqlSessionFactory")
  @Primary
  public SqlSessionFactory sqlSessionFactory(@Qualifier("targetDataSource") DataSource dataSource)
      throws Exception {
    
    //不使用下面这个无法使用mybatis-plus提供的BaseMapper中的方法，需要增加mybatis-plus 的拓展依赖
    MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    //不在这里注入分页插件，会失效
    //bean.setPlugins(new PaginationInterceptor[]{new PaginationInterceptor()});
    return bean.getObject();
  }
}

注意dao一定要在@MapperScan注解设置的包下
注意xml文件要在MAPPER_LOCATION=的路径下
SpringBoot启动类不要再用@MapperScan注解
其他注意配置类的SqlSessionFactory 方法，看注释

4.使用

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.easylinkin.dc.common.exceptions.BusinessException;
import com.easylinkin.dc.common.utils.io.OutputStreamUtil;
import com.easylinkin.dc.mapper.source1.FkReGISterVisitorMapper;
import com.easylinkin.dc.business.visitor.entity.FkRegisterVisitor;
import com.easylinkin.dc.business.visitor.entity.vo.FkRegisterVisitorVo;
import com.easylinkin.dc.business.visitor.service.FkRegisterVisitorService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.Assert;
import javax.servlet.Http.httpservletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

@DS("source1")
@Slf4j
@Service("fkRegisterVisitorService")
public class FkRegisterVisitorServiceImpl extends ServiceImpl
    <FkRegisterVisitorMapper, FkRegisterVisitor> implements FkRegisterVisitorService {
    }

注意是在service的实现类上用@DS(“数据源名称”)注解，数据源名称与配置文件里的datasource下的一致。

注意dao不能再用@DS注解，否在报错

总结

我也是一个怕麻烦的人，所以能有简单的办法，我绝对不用复杂的，多数据源集成就是这么简单，也没啥好总结的，就提醒下：

跨数据源的业务接口要注意事务

@Transactional不生效

其实也有动态切换数据源的方法，我觉得没必要，规规矩矩用service，别把自己整糊了。

好就简单写道这里，up！

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