SpringBoot超詳細(xì)講解多數(shù)據(jù)源集成

更新時(shí)間：2022年05月20日 09:50:38 作者：肥仔哥哥1930

今天分享下SpringBoot多數(shù)據(jù)源集成，我怕麻煩，這里我覺(jué)得我的集成也應(yīng)該是最簡(jiǎn)單的，清晰明了

一、多數(shù)據(jù)源使用場(chǎng)景與弊端

1.場(chǎng)景

業(yè)務(wù)系統(tǒng)跨數(shù)據(jù)庫(kù)
數(shù)據(jù)轉(zhuǎn)存（這個(gè)現(xiàn)在太low了，應(yīng)該高級(jí)點(diǎn)都不用）
系統(tǒng)集成

2.弊端

跨庫(kù)業(yè)務(wù)事務(wù)問(wèn)題
service、dao不能重復(fù)注入數(shù)據(jù)源

二、使用步驟

1.引入庫(kù)

<!-- 多數(shù)據(jù)源支持 -->
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
      <version>3.3.6</version>
    </dependency>

2.多數(shù)據(jù)源配置文件

#數(shù)據(jù)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.多數(shù)據(jù)源配置類

數(shù)據(jù)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/*.xml";
  /**
   * 數(shù)據(jù)源
   */
  @Bean(name = "source1DataSource")
  @ConfigurationProperties(prefix = "spring.datasource.source1")
  public DataSource dataSource() {
    DataSource build = DataSourceBuilder.create().build();
    return build;
  }
  /**
   * 事務(wù)管理器
   */
  @Bean(name = "source1TransactionManager")
  public PlatformTransactionManager dataSourceTransactionManager(
      @Qualifier("source1DataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }
  /**
   * session工廠
   */
  @Bean(name = "source1SqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(@Qualifier("source1DataSource") DataSource dataSource)
      throws Exception {
  /*  final SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
    sessionFactoryBean.setDataSource(dataSource);
    sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(
        Source1DataSourceConfig.MAPPER_LOCATION));*/
    //不使用下面這個(gè)無(wú)法使用mybatis-plus提供的BaseMapper中的方法，需要增加mybatis-plus 的拓展依賴
    MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    //不在這里注入分頁(yè)插件，會(huì)失效
    //bean.setPlugins(new PaginationInterceptor[]{new PaginationInterceptor()});
    return bean.getObject();
  }
}

數(shù)據(jù)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/*.xml";
  /**
   * 主數(shù)據(jù)源，Primary注解必須增加，它表示該數(shù)據(jù)源為默認(rèn)數(shù)據(jù)源 項(xiàng)目中還可能存在其他的數(shù)據(jù)源，如獲取時(shí)不指定名稱，則默認(rèn)獲取這個(gè)數(shù)據(jù)源，如果不添加，則啟動(dòng)時(shí)候回報(bào)錯(cuò)
   */
  @Primary
  @Bean(name = "targetDataSource")
  @ConfigurationProperties(prefix = "spring.datasource.target")
  public DataSource dataSource() {
    DataSource build = DataSourceBuilder.create().build();
    return build;
  }
  /**
   * 事務(wù)管理器，Primary注解作用同上
   */
  @Bean(name = "masterTransactionManager")
  @Primary
  public PlatformTransactionManager dataSourceTransactionManager(
      @Qualifier("targetDataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }
  /**
   * session工廠，Primary注解作用同上
   */
  @Bean(name = "targetSqlSessionFactory")
  @Primary
  public SqlSessionFactory sqlSessionFactory(@Qualifier("targetDataSource") DataSource dataSource)
      throws Exception {
    /*final SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
    sessionFactoryBean.setDataSource(dataSource);
    sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(
        TargetDataSourceConfig.MAPPER_LOCATION));
    return sessionFactoryBean.getObject();*/
    //不使用下面這個(gè)無(wú)法使用mybatis-plus提供的BaseMapper中的方法，需要增加mybatis-plus 的拓展依賴
    MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    //不在這里注入分頁(yè)插件，會(huì)失效
    //bean.setPlugins(new PaginationInterceptor[]{new PaginationInterceptor()});
    return bean.getObject();
  }
}

注意dao一定要在@MapperScan注解設(shè)置的包下
注意xml文件要在MAPPER_LOCATION=的路徑下
springBoot啟動(dòng)類不要再用@MapperScan注解
其他注意配置類的SqlSessionFactory 方法，看注釋

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;
/**
 * FkRegisterVisitor表服務(wù)實(shí)現(xiàn)類
 *
 * @author CodeGenerator
 * @date 2022/05/16
 */
@DS("source1")
@Slf4j
@Service("fkRegisterVisitorService")
public class FkRegisterVisitorServiceImpl extends ServiceImpl
    <FkRegisterVisitorMapper, FkRegisterVisitor> implements FkRegisterVisitorService {
    }

注意是在service的實(shí)現(xiàn)類上用@DS(“數(shù)據(jù)源名稱”)注解，數(shù)據(jù)源名稱與配置文件里的datasource下的一致。

注意dao不能再用@DS注解，否在報(bào)錯(cuò)

總結(jié)

我也是一個(gè)怕麻煩的人，所以能有簡(jiǎn)單的辦法，我絕對(duì)不用復(fù)雜的，多數(shù)據(jù)源集成就是這么簡(jiǎn)單，也沒(méi)啥好總結(jié)的，就提醒下：

跨數(shù)據(jù)源的業(yè)務(wù)接口要注意事務(wù)

@Transactional不生效

其實(shí)也有動(dòng)態(tài)切換數(shù)據(jù)源的方法，我覺(jué)得沒(méi)必要，規(guī)規(guī)矩矩用service，別把自己整糊了。

好就簡(jiǎn)單寫(xiě)道這里，up！

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