（五）springboot 配置多数据源连接mysql和hive

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CREATE TABLE `user` (

  `id` int(11) NOT NULL,

  `name` varchar(255) COLLATE utf8mb4_general_ci DEFAULT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

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create table `user` (`id` int, `name` string);

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<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>

    <artifactId>hadoop-demo</artifactId>

    <version>1.0-SNAPSHOT</version>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <mybatis-spring-boot>1.2.0</mybatis-spring-boot>

        <mysql-connector>8.0.11</mysql-connector>

        <activiti.version>5.22.0</activiti.version>

    </properties>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.7.7</version>

    </parent>

    <dependencies>

        <!--springBoot相关-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->

        <!-- https://mvnrepository.com/artifact/com.baomidou/dynamic-datasource-spring-boot-starter -->

        <dependency>

            <groupId>com.baomidou</groupId>

            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>

            <version>3.6.1</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->

        <dependency>

            <groupId>com.baomidou</groupId>

            <artifactId>mybatis-plus-boot-starter</artifactId>

            <version>3.5.3.1</version>

        </dependency>

        <!--mybatis相关-->

        <!--   <dependency>

              <groupId>org.mybatis.spring.boot</groupId>

              <artifactId>mybatis-spring-boot-starter</artifactId>

              <version>${mybatis-spring-boot}</version>

          </dependency>-->

          <!--mysql驱动相关-->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>${mysql-connector}</version>

        </dependency>

        <!--druid连接池相关-->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid</artifactId>

            <version>1.1.12</version>

        </dependency>

        <!-- 添加hadoop依赖begin -->

        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-common -->

        <dependency>

            <groupId>org.apache.hadoop</groupId>

            <artifactId>hadoop-common</artifactId>

            <version>3.3.4</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs -->

        <dependency>

            <groupId>org.apache.hadoop</groupId>

            <artifactId>hadoop-hdfs</artifactId>

            <version>3.3.4</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client -->

        <dependency>

            <groupId>org.apache.hadoop</groupId>

            <artifactId>hadoop-client</artifactId>

            <version>3.3.4</version>

        </dependency>

        <!--添加hadoop依赖end -->

        <!-- 添加hive依赖begin -->

        <dependency>

            <groupId>org.apache.hive</groupId>

            <artifactId>hive-jdbc</artifactId>

            <version>3.1.3</version>

            <exclusions>

                <exclusion>

                    <groupId>org.eclipse.jetty.aggregate</groupId>

                    <artifactId>*</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>org.eclipse.jetty</groupId>

                    <artifactId>jetty-runner</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

        <!-- 添加hive依赖end -->

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <version>1.18.24</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.12</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <finalName>community</finalName>

        <resources>

            <resource>

                <directory>src/main/java</directory>

                <includes>

                    <include>**/*.properties</include>

                    <include>**/*.xml</include>

                </includes>

                <filtering>false</filtering>

            </resource>

            <resource>

                <directory>src/main/resources</directory>

                <includes>

                    <include>**/*.*</include>

                </includes>

                <filtering>false</filtering>

            </resource>

        </resources>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <mainClass>com.mfc.hive.HiveApplication</mainClass>

                    <layout>ZIP</layout>

                    <includeSystemScope>true</includeSystemScope>

                </configuration>

                <executions>

                    <execution>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

</project>

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server:

  port: 6080

spring:

  application:

    name: hadoop-service

  datasource:

    dynamic:

      primary: master #设置默认的数据源，默认值为master

      strict: false   #是否弃用严格模式，如果启用在味匹配到指定数据源时抛出异常

      datasource:

        master:

          driver-class-name: com.mysql.jdbc.Driver

          type: com.alibaba.druid.pool.DruidDataSource

          url: jdbc:mysql://localhost:3306/hadoop?useUnicode=true&characterEncoding=utf-8&useSSL=false&allowMultiQueries=true&allowPublicKeyRetrieval=true&serverTimezone=GMT%2b8

          username: root

          password: xxxx

        hive:

          driver-class-name: org.apache.hive.jdbc.HiveDriver

          type: com.alibaba.druid.pool.DruidDataSource

          url: jdbc:hive2://hadoop-master:21000

          username: hadoop

          password:

  druid:

    initialSize: 5 #初始化连接大小

    minIdle: 5     #最小连接池数量

    maxActive: 20  #最大连接池数量

    maxWait: 60000 #获取连接时最大等待时间，单位毫秒

    timeBetweenEvictionRunsMillis: 60000 #配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒

    minEvictableIdleTimeMillis: 300000   #配置一个连接在池中最小生存的时间，单位是毫秒

    validationQuery: SELECT 1 from DUAL  #测试连接

    testWhileIdle: true                  #申请连接的时候检测，建议配置为true，不影响性能，并且保证安全性

    testOnBorrow: false                  #获取连接时执行检测，建议关闭，影响性能

    testOnReturn: false                  #归还连接时执行检测，建议关闭，影响性能

    poolPreparedStatements: false        #是否开启PSCache，PSCache对支持游标的数据库性能提升巨大，oracle建议开启，mysql下建议关闭

    maxPoolPreparedStatementPerConnectionSize: 20 #开启poolPreparedStatements后生效

    filters: stat,wall,log4j #配置扩展插件，常用的插件有=>stat:监控统计  log4j:日志  wall:防御sql注入

    connectionProperties: 'druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000' #通过connectProperties属性来打开mergeSql功能;慢SQL记录

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package com.mfc.hive.controller;

import com.mfc.hive.domain.User;

import com.mfc.hive.service.IHiveService;

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;

import java.util.List;

@RestController

@RequestMapping("/api/v1/hive")

public class HiveController {

    @Autowired

    private IHiveService hiveService;

    @GetMapping("/mysql")

    public void mysql() {

        List<User> userList = hiveService.mysql();

        int a = 0;

    }

    @GetMapping("/hive")

    public void hive() {

        List<User> userList = hiveService.hive();

        int a = 0;

    }

}

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package com.mfc.hive.service;

import com.mfc.hive.domain.User;

import java.util.List;

public interface IHiveService {

    List<User> mysql();

    List<User>  hive();

}

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package com.mfc.hive.service.impl;

import com.mfc.hive.dao.mapper.IHiveMapper;

import com.mfc.hive.domain.User;

import com.mfc.hive.service.IHiveService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import java.util.List;

@Service

public class HiveServiceImpl implements IHiveService {

    @Autowired

    private IHiveMapper hiveMapper;

    public List<User> mysql() {

        return hiveMapper.mysql();

    }

    public List<User> hive() {

        return hiveMapper.hive();

    }

}

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package com.mfc.hive.dao.mapper;

import com.baomidou.dynamic.datasource.annotation.DS;

import com.mfc.hive.domain.User;

import org.springframework.stereotype.Repository;

import java.util.List;

@Repository

public interface IHiveMapper {

    List<User> mysql();

    @DS("hive")

    List<User> hive();

}

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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.mfc.hive.dao.mapper.IHiveMapper">

    <resultMap id="userMap" type="com.mfc.hive.domain.User">

        <id property="id" column="id"/>

        <result property="name" column="name"/>

    </resultMap>

    <select id="mysql" parameterType="String" resultMap="userMap">

        select `id`,`name` from `user`

    </select>

    <select id="hive" parameterType="String" resultMap="userMap">

        select `id`,`name` from `user`

    </select>

</mapper>