前言

之前不使用 mbatis-plus 下面的dynamic多数据源，对于多数据源的项目，都需要针对每个数据源写一个配置文件，很繁琐很麻烦。如下，针对Tdengine的配置。
首先在 application.yml 中配置。

在这里插入图片描述

其次创建配置类：

import com.alibaba.druid.pool.DruidDataSource;
import com.chain.common.utils.StringUtils;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import javax.sql.DataSource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * 类名: TDengineConfig
 * 描述: TDengine配置类
 * 时间: 2022/5/13,0016 1:14
 * 开发人: wxy
 */
@Configuration
@MapperScan(basePackages = {
    
    "com.chain.iot.tdengine.dao"}, sqlSessionTemplateRef = "tdengineSqlSessionTemplate") // 声明此数据源作用的包
@ConditionalOnProperty(name = "spring.datasource.druid.tdengine-server.enabled", havingValue = "true")
public class TDengineConfig {
    
    

    @Value("${spring.datasource.druid.tdengine-server.dbName}")
    private String dbName;
    @Value("${spring.datasource.druid.tdengine-server.url}")
    private String jdbc;

    @Bean(name = "tDengineDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.druid.tdengine-server")
    public DataSource tdengineDataSource() {
    
    
        return new DruidDataSource();
    }

    @Bean(name = "tDengineSqlSessionFactory")
    public SqlSessionFactory tDengineSqlSessionFactory(@Qualifier("tDengineDataSource") DataSource dataSource) throws Exception {
    
    
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setMapperLocations(resolveMapperLocations(StringUtils.split("classpath:mapper/tdengine/*Mapper.xml", ",")));
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean.getObject();
    }

    @Bean(name = "tdengineSqlSessionTemplate")
    public SqlSessionTemplate tdengineSqlSessionTemplate(@Qualifier("tDengineSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    
    
        return new SqlSessionTemplate(sqlSessionFactory);
    }

    public String getDbName() {
    
    
        return dbName;
    }

    public void setDbName(String dbName) {
    
    
        this.dbName = dbName;
    }
    public Resource[] resolveMapperLocations(String[] mapperLocations)
    {
    
    
        ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();
        List<Resource> resources = new ArrayList<Resource>();
        if (mapperLocations != null)
        {
    
    
            for (String mapperLocation : mapperLocations)
            {
    
    
                try
                {
    
    
                    Resource[] mappers = resourceResolver.getResources(mapperLocation);
                    resources.addAll(Arrays.asList(mappers));
                }
                catch (IOException e)
                {
    
    
                    // ignore
                }
            }
        }
        return resources.toArray(new Resource[resources.size()]);
    }
}

导入依赖

<!-- mp多数据源 -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>3.5.1</version>
</dependency>

<!-- TDEngine -->
<dependency>
    <groupId>com.taosdata.jdbc</groupId>
    <artifactId>taos-jdbcdriver</artifactId>
    <version>3.0.0</version>
</dependency>

<!-- Druid数据源 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.2.9</version>
</dependency>

配置文件 application.yml

server:
  port: 8085
  servlet:
    context-path: /lmh

# 将resources下的mapper下的xml文件都读取到 target
mybatis-plus:
  mapper-locations: classpath:/mapper/*.xml

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    dynamic:
      primary: master # 默认数据源
      datasource:
        master:
          url: jdbc:mysql://localhost/my_schema?useUnicode=true&useSSL=false&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
          username: root
          password: 123456
          driver-class-name: com.mysql.cj.jdbc.Driver
        tdengine:
          url: jdbc:TAOS://master:6030/db?charset=utf-8
          driver-class-name: com.taosdata.jdbc.TSDBDriver
          username: root
          password: taosdata
    druid:
      initialSize: 5
      minIdle: 5
      maxActive: 200
      maxWait: 60000
      timeBetweenEvictionRunsMillis: 60000
      minEvictableIdleTimeMillis: 300000
      validationQuery: SELECT 1 FROM DUAL
      testWhileIdle: true
      testOnBorrow: false
      testOnReturn: false
      poolPreparedStatements: false
      filters: stat,wall,log4j2
      # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
      connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500