springboot+druid+mybatis plus的多数据源配置

思路

1. yml中配置多个数据源信息
2. 通过AOP切换不同数据源
3. 配合mybatis plus使用

POM依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>
<!-- AOP依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.0.0</version>
</dependency>
<!-- MyBatisPlus -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.1.0</version>
</dependency>
<!--Mysql-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.6</version>
    <scope>runtime</scope>
</dependency>
<!-- Druid依赖 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.10</version>
</dependency>

YML配置

spring:
  aop:
    proxy-target-class: true
    auto: true
  datasource:
    druid:
      es:
        url: jdbc:mysql://192.168.21.181:3306/jarvis
        username: root
        password: 123456
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        initialSize: 5
        minIdle: 5
        maxActive: 20
      wx:
        initialSize: 5
        minIdle: 5
        maxActive: 20
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        username: root
        password: 123456
        url: jdbc:mysql://192.168.21.181:3306/jarvis_wx

启动加载多个数据源

package com.jarvis.config;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.baomidou.mybatisplus.core.MybatisConfiguration;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.type.JdbcType;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.transaction.annotation.EnableTransactionManagement;

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

@Configuration
@EnableTransactionManagement
@MapperScan("com.jarvis.task.*.mapper")
public class MybatisPlusConfig {

    /***
     * plus 的性能优化
     */
    @Bean
    public PerformanceInterceptor performanceInterceptor() {
        PerformanceInterceptor performanceInterceptor = new PerformanceInterceptor();
        /* <!-- SQL 执行性能分析，开发环境使用，线上不推荐。 maxTime 指的是 sql 最大执行时长 --> */
        //performanceInterceptor.setMaxTime(1000);
        /* <!--SQL是否格式化 默认false--> */
        performanceInterceptor.setFormat(false);
        return performanceInterceptor;
    }

    /**
     * mybatis-plus 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor page = new PaginationInterceptor();
        page.setDialectType("mysql");
        return page;
    }


    @Bean(name = "esDb")
    @ConfigurationProperties(prefix = "spring.datasource.druid.es" )
    public DataSource esDb () {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "wxDb")
    @ConfigurationProperties(prefix = "spring.datasource.druid.wx" )
    public DataSource wxDb () {
        return DruidDataSourceBuilder.create().build();
    }
    /**
     * 动态数据源配置
     * @return
     */
    @Bean
    @Primary
    public DataSource multipleDataSource (@Qualifier("esDb") DataSource esDb,
                                          @Qualifier("wxDb") DataSource wxDb ) {
        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        Map< Object, Object > targetDataSources = new HashMap<>(2);
        targetDataSources.put(DBTypeEnum.ES.getValue(), esDb );
        targetDataSources.put(DBTypeEnum.WX.getValue(), wxDb);
        dynamicDataSource.setTargetDataSources(targetDataSources);
        dynamicDataSource.setDefaultTargetDataSource(esDb);
        return dynamicDataSource;
    }

    @Bean("sqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(multipleDataSource(esDb(),wxDb()));
        //sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:/mapper/*/*Mapper.xml"));

        MybatisConfiguration configuration = new MybatisConfiguration();
        //configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
        configuration.setJdbcTypeForNull(JdbcType.NULL);
        configuration.setMapUnderscoreToCamelCase(true);
        configuration.setCacheEnabled(false);
        sqlSessionFactory.setConfiguration(configuration);
        sqlSessionFactory.setPlugins(new Interceptor[]{ //PerformanceInterceptor(),OptimisticLockerInterceptor()
                paginationInterceptor() //添加分页功能
        });
//        sqlSessionFactory.setGlobalConfig(globalConfiguration());
        return sqlSessionFactory.getObject();
    }

//    @Bean
//    public GlobalConfiguration globalConfiguration() {
//        GlobalConfiguration conf = new GlobalConfiguration(new LogicSqlInjector());
//        conf.setLogicDeleteValue("-1");
//        conf.setLogicNotDeleteValue("1");
//        conf.setIdType(0);
//        conf.setMetaObjectHandler(new MyMetaObjectHandler());
//        conf.setDbColumnUnderline(true);
//        conf.setRefresh(true);
//        return conf;
//    }
}

DBType枚举类

public enum DBTypeEnum {
    ES("es"), WX("wx");
    private String value;

    DBTypeEnum(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }
}

动态数据源决策

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class DynamicDataSource extends AbstractRoutingDataSource {
    /**
     * 取得当前使用哪个数据源
     * @return
     */
    @Override
    protected Object determineCurrentLookupKey() {
        return DbContextHolder.getDbType();
    }
}

设置、获取数据源

public class DbContextHolder {
    private static final ThreadLocal contextHolder = new ThreadLocal<>();
    /**
     * 设置数据源
     * @param dbTypeEnum
     */
    public static void setDbType(DBTypeEnum dbTypeEnum) {
        contextHolder.set(dbTypeEnum.getValue());
    }

    /**
     * 取得当前数据源
     * @return
     */
    public static String getDbType() {
        return (String) contextHolder.get();
    }

    /**
     * 清除上下文数据
     */
    public static void clearDbType() {
        contextHolder.remove();
    }
}

AOP实现的数据源切换

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.annotation.*;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Aspect
@Order(-100) //这是为了保证AOP在事务注解之前生效,Order的值越小,优先级越高
@Slf4j
public class DataSourceSwitchAspect {

    @Pointcut("execution(* com.jarvis.task.db2es.mapper..*.*(..))")
    private void jarvisAspect() {
    }

    @Pointcut("execution(* com.jarvis.task.dt2db.mapper..*.*(..))")
    private void jarvisWxAspect() {
    }

    @Before("jarvisAspect()")
    public void jarvisDb() {
        log.info("切换到ES 数据源...");
        DbContextHolder.setDbType(DBTypeEnum.ES);
    }

    @Before("jarvisWxAspect()")
    public void jarvisWxDb () {
        log.info("切换到WX 数据源...");
        DbContextHolder.setDbType(DBTypeEnum.WX);
    }
}

mapper层结构

 参考

　　https://www.jianshu.com/p/ff5af6c59365?utm_source=oschina-app