springboot+mybatisplus+swagger多数据源demo实例

实现:从一个数据库中的某张表中获取数据,插入到另一个数据库中的另一张表,两张表的数据结构不一致

基于网上找了很多篇内容,最终借用了https://cloud.tencent.com/developer/article/1447714的内容了数据源的配置,数据调用的方法通过注解,最终在实现的时候通过注解@Autowired 一个controller来实现方法内同时并存两个数据源,TNewsController里实现的

springboot+mybatisplus+swagger多数据源demo实例_第1张图片

由于使用的数据库实例不是私人的,实体代码请自行替换

以下是项目的具体,数据库是mysql和mssql,所以文件也跟着区分了

springboot+mybatisplus+swagger多数据源demo实例_第2张图片springboot+mybatisplus+swagger多数据源demo实例_第3张图片

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import springfox.documentation.swagger2.annotations.EnableSwagger2;


@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@EnableSwagger2
public class DatasApplication {

    public static void main(String[] args) {
        SpringApplication.run(DatasApplication.class, args);
    }

}

以下是pom文件代码



    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.7.RELEASE
         
    
    com
    datas
    0.0.1-SNAPSHOT
    datas
    war
    Demo project for Spring Boot

    
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            org.springframework.boot
            spring-boot-starter-aop
        



        
            com.microsoft.sqlserver
            mssql-jdbc
            7.0.0.jre8
            runtime
        

        
            mysql
            mysql-connector-java
            5.1.22
            runtime
        

        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        



        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.1.1
        

        
        
            io.springfox
            springfox-swagger2
            2.9.2
        

        
            io.springfox
            springfox-swagger-ui
            2.9.2
        
        
            com.github.xiaoymin
            swagger-bootstrap-ui
            1.9.1
        
        
            io.springfox
            springfox-bean-validators
            2.9.2
        

        
            io.swagger
            swagger-annotations
            1.5.21
        
        
            io.swagger
            swagger-models
            1.5.21
        

        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.10
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
        
            
                src/main/resources
                true
            
            
                src/main/java
                
                    **/*.xml
                    **/*.yml
                    **/*.ftl
                
            
        
    


application.yml文件   数据库相关数据替换成自己的

server:
  port: 5000


spring:
  datasource:
    dynamic:
      primary: master #设置默认的数据源或者数据源组,默认值即为master
      datasource:
        master:
          jdbc-url: jdbc:mysql://
          username: 
          password: 
          type: com.alibaba.druid.pool.DruidDataSource
          driver-class-name: com.mysql.jdbc.Driver
        slave:
          jdbc-url: jdbc:sqlserver://
          username: 
          password: 
          type: com.alibaba.druid.pool.DruidDataSource
          driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver





#mybatis plus 设置
mybatis-plus:
  mapper-locations: classpath*:com/datas/**/mapper/xml/*Mapper.xml
  global-config:
    db-config:
      logic-delete-value: 1 # 逻辑已删除值(默认为 1)
      logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)

config文件相关代码

import java.lang.annotation.*;

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataSource {
    String value();
}
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

import javax.sql.DataSource;
import java.util.Map;

public class DynamicDataSource extends AbstractRoutingDataSource {
    /**
     * 如果不希望数据源在启动配置时就加载好,可以定制这个方法,从任何你希望的地方读取并返回数据源
     * 比如从数据库、文件、外部接口等读取数据源信息,并最终返回一个DataSource实现类对象即可
     */
    @Override
    protected DataSource determineTargetDataSource() {
        return super.determineTargetDataSource();
    }

    /**
     * 如果希望所有数据源在启动配置时就加载好,这里通过设置数据源Key值来切换数据,定制这个方法
     */
    @Override
    protected Object determineCurrentLookupKey() {
        return DynamicDataSourceContextHolder.getDataSourceKey();
    }

    /**
     * 设置默认数据源
     * @param defaultDataSource
     */
    public void setDefaultDataSource(Object defaultDataSource) {
        super.setDefaultTargetDataSource(defaultDataSource);
    }

    /**
     * 设置数据源
     * @param dataSources
     */
    public void setDataSources(Map dataSources) {
        super.setTargetDataSources(dataSources);
        // 将数据源的 key 放到数据源上下文的 key 集合中,用于切换时判断数据源是否有效
        DynamicDataSourceContextHolder.addDataSourceKeys(dataSources.keySet());
    }
}
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Aspect
@Order(-1)  // 该切面应当先于 @Transactional 执行
@Component
public class DynamicDataSourceAspect {
    /**
     * 切换数据源
     * @param point
     * @param dataSource
     */
    @Before("@annotation(dataSource))")
    public void switchDataSource(JoinPoint point, DataSource dataSource) {
        if (!DynamicDataSourceContextHolder.containDataSourceKey(dataSource.value())) {
            System.out.println("DataSource [{}] doesn't exist, use default DataSource [{}] " + dataSource.value());
        } else {
            // 切换数据源
            DynamicDataSourceContextHolder.setDataSourceKey(dataSource.value());
            System.out.println("Switch DataSource to [" + DynamicDataSourceContextHolder.getDataSourceKey()
                    + "] in Method [" + point.getSignature() + "]");
        }
    }

    /**
     * 重置数据源
     * @param point
     * @param dataSource
     */
    @After("@annotation(dataSource))")
    public void restoreDataSource(JoinPoint point, DataSource dataSource) {
        // 将数据源置为默认数据源
        DynamicDataSourceContextHolder.clearDataSourceKey();
        System.out.println("Restore DataSource to [" + DynamicDataSourceContextHolder.getDataSourceKey()
                + "] in Method [" + point.getSignature() + "]");
    }
}
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class DynamicDataSourceContextHolder {
    private static final ThreadLocal contextHolder = new ThreadLocal() {
        /**
         * 将 master 数据源的 key作为默认数据源的 key
         */
        @Override
        protected String initialValue() {
            return "master";
        }
    };


    /**
     * 数据源的 key集合,用于切换时判断数据源是否存在
     */
    public static List dataSourceKeys = new ArrayList<>();

    /**
     * 切换数据源
     * @param key
     */
    public static void setDataSourceKey(String key) {
        contextHolder.set(key);
    }

    /**
     * 获取数据源
     * @return
     */
    public static String getDataSourceKey() {
        return contextHolder.get();
    }

    /**
     * 重置数据源
     */
    public static void clearDataSourceKey() {
        contextHolder.remove();
    }

    /**
     * 判断是否包含数据源
     * @param key 数据源key
     * @return
     */
    public static boolean containDataSourceKey(String key) {
        return dataSourceKeys.contains(key);
    }

    /**
     * 添加数据源keys
     * @param keys
     * @return
     */
    public static boolean addDataSourceKeys(Collection keys) {
        return dataSourceKeys.addAll(keys);
    }
} 
  
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Value;
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;

import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;

@Configuration
@MapperScan(basePackages = "com.datas.**.mapper")
public class MybatisConfig {
    @Value("${spring.datasource.dynamic.datasource.master.jdbc-url}")
    private String url;

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

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

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

    @Value("${spring.datasource.dynamic.datasource.slave.jdbc-url}")
    private String surl;

    @Value("${spring.datasource.dynamic.datasource.slave.username}")
    private String suser;

    @Value("${spring.datasource.dynamic.datasource.slave.password}")
    private String spassword;

    @Value("${spring.datasource.dynamic.datasource.slave.driver-class-name}")
    private String sdriverClass;


    @Bean("master")
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource.dynamic.datasource.master")
    public DataSource master() {
        return DataSourceBuilder.create()
                .driverClassName(driverClass)
                .url(url)
                .username(user)
                .password(password)
                .build();
    }

    @Bean("slave")
    @ConfigurationProperties(prefix = "spring.datasource.dynamic.datasource.slave")
    public DataSource slave() {
        return DataSourceBuilder.create()
                .driverClassName(sdriverClass)
                .url(surl)
                .username(suser)
                .password(spassword)
                .build();
    }

    @Bean("dynamicDataSource")
    public DataSource dynamicDataSource() {
        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        Map dataSourceMap = new HashMap<>(2);
        dataSourceMap.put("master", master());
        dataSourceMap.put("slave", slave());
        // 将 master 数据源作为默认指定的数据源
        dynamicDataSource.setDefaultDataSource(master());
        // 将 master 和 slave 数据源作为指定的数据源
        dynamicDataSource.setDataSources(dataSourceMap);
        return dynamicDataSource;
    }

    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean() throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        // 配置数据源,此处配置为关键配置,如果没有将 dynamicDataSource作为数据源则不能实现切换
        sessionFactory.setDataSource(dynamicDataSource());
        sessionFactory.setTypeAliasesPackage("com.datas.*sql");    // 扫描Model
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sessionFactory.setMapperLocations(resolver.getResources("classpath*:com/datas/**/mapper/xml/*Mapper.xml"));    // 扫描映射文件
        return sessionFactory;
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        // 配置事务管理, 使用事务时在方法头部添加@Transactional注解即可
        return new DataSourceTransactionManager(dynamicDataSource());
    }
}
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.ParameterBuilder;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.schema.ModelRef;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Parameter;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.util.ArrayList;
import java.util.List;

@Configuration
@EnableSwagger2
public class SwaggerConfig {

    @Bean
    public Docket createRestApi(){
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.any())
                .build()
                .globalOperationParameters(setHeaderToken())
                .apiInfo(apiInfo());
    }

    private List setHeaderToken() {
        ParameterBuilder tokenPar = new ParameterBuilder();
        List pars = new ArrayList<>();
        tokenPar.name("Authorization").description("token").modelRef(new ModelRef("string")).parameterType("header").required(false).build();
        pars.add(tokenPar.build());
        return pars;
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("datas")
                .description("datas文档")
                .termsOfServiceUrl("http://www")
                .version("1.0.0")
                .build();
    }
}

mssql相关代码,mssql作查询,简单写了下

import com.datas.config.DataSource;
import com.datas.mssql.entity.NewsEntity;
import com.datas.mssql.service.NewsService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Api(tags ="mssql news")
@RestController
@RequestMapping("/mssql")
public class NewsController {

    public NewsController(){}

    @Autowired
    private NewsService newsService;

    @DataSource(value ="slave")
    @GetMapping(value ="/id")
    @ApiOperation("通过ID获取数据")
    public NewsEntity getById(Integer id){
        //通过重写方法获得实体
        NewsEntity newsEntity =newsService.getById(id);
        return newsEntity;
    }

    @DataSource(value ="slave")
    @GetMapping(value ="/getid")
    @ApiOperation("通过ID获取数据")
    public NewsEntity getId(Integer id){
        try{
            //mabatis框架封装的方法
            NewsEntity newsEntity =newsService.getById(id);
            return newsEntity;
        }catch (Exception e){
            System.out.print(e);
            return null;
        }
    }
}

 实体类的代码只扒了一点点

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.io.Serializable;
import java.util.Date;

@Data
@TableName("CMS_News")
public class NewsEntity implements Serializable {

    private static final long serialVersionUID = 1L;


    /**
     * 主键
     */
    @TableId
    private Integer id;

    private String guid;

    private String title;
}




import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.datas.mssql.entity.NewsEntity;
import org.apache.ibatis.annotations.Select;

public interface NewsMapper extends BaseMapper {

    @Select("select * from CMS_News where ID =#{id}")
    NewsEntity getById(Integer id);
}
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.datas.config.DataSource;
import com.datas.mssql.entity.NewsEntity;
import com.datas.mssql.mapper.NewsMapper;
import com.datas.mssql.service.NewsService;
import org.springframework.stereotype.Service;

@Service
public class NewsServiceImpl extends ServiceImpl implements NewsService {
    
    @Override
    @DataSource("slave")
    public NewsEntity getById(Integer id){
        return this.baseMapper.getById(id);
    }
    
}
import com.baomidou.mybatisplus.extension.service.IService;
import com.datas.mssql.entity.NewsEntity;

public interface NewsService extends IService {
    NewsEntity getById(Integer id);

}

mysql文件代码

import com.datas.config.DataSource;
import com.datas.mssql.controller.NewsController;
import com.datas.mssql.entity.NewsEntity;
import com.datas.mysql.entity.TNewsEntity;
import com.datas.mysql.service.TNewsService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@Api(tags ="mysql news")
@RestController
@RequestMapping("/mysql")
public class TNewsController {

    @Autowired
    private TNewsService tnewsService;

    @Autowired
    private NewsController newsController;


    @PutMapping(value ="/save{fromid}")
    @DataSource("master")//注入数据源
    @ApiOperation("通过mssql表里的ID进行同步操作")
    public String saveByFromId(@PathVariable Integer fromid){
        //从mssql表里获取数据
        NewsEntity newsEntity =newsController.getById(fromid);
        //封装mysql表里需要的数据
        TNewsEntity tNewsEntity =new TNewsEntity();
        tNewsEntity.setFromId(fromid);
        tNewsEntity.setGuid(newsEntity.getGuid());
        tNewsEntity.setTitle(newsEntity.getTitle());
        tNewsEntity.setDescriptions(newsEntity.getDescriptions());
        tNewsEntity.setContents(newsEntity.getContents());
        try{
            tnewsService.add(tNewsEntity);
            return "ok";
        }catch (Exception e){
            System.out.print(e);
            return e.getMessage();
        }
    }


}
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.io.Serializable;

@Data
@TableName("test_news")
public class TNewsEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    /**
     * 主键
     */
    @TableId
    private Integer id;

    private Integer fromId;

    private String guid;

    private String title;

    private String descriptions;

    private String contents;

}





import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.datas.config.DataSource;
import com.datas.mysql.entity.TNewsEntity;
import org.apache.ibatis.annotations.Insert;

@DataSource("master")
public interface TNewsMapper extends BaseMapper {
    @Insert("insert into test_news (From_Id,GUID,Title,Descriptions,Contents)" +
            "values ( #{fromId},#{guid},#{title},#{descriptions},#{contents})")
    void save(TNewsEntity tNewsEntity);

}
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.datas.config.DataSource;
import com.datas.mysql.entity.TNewsEntity;
import com.datas.mysql.mapper.TNewsMapper;
import com.datas.mysql.service.TNewsService;
import org.springframework.stereotype.Service;

@Service
public class TNewsServiceImpl extends ServiceImpl implements TNewsService {


    @Override
    @DataSource("master")
    public void add(TNewsEntity entity){
        baseMapper.save(entity);
    }
}
import com.baomidou.mybatisplus.extension.service.IService;
import com.datas.mysql.entity.TNewsEntity;

public interface TNewsService extends IService {

    void add(TNewsEntity entity);
}

 

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