SpringBoot从入门到精通教程（七）- Mysql多数据源和Hikari用法详解

需求背景

在Springboot2框架中，常常需要用到以下两个功能点：

1. Mysql多数据源集成

2. Hikari 连接池用法详解

准备内容

1. 准备两个Mysql实例

2. 数据库初始化init.sql脚本内容（或Docker安装MySQL数据库）

db1-init.sql

-- for db1

drop table city1;

CREATE TABLE `city1` (
  `id` int(11) NOT NULL primary key,
  `name` varchar(32) DEFAULT NULL,
  `state` varchar(32) DEFAULT NULL,
  `country` varchar(32) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `city1` (`id`, `name`, `state`, `country`)
VALUES
	(1, '广州1', 'GZ1', 'CH1'),
	(2, '北京1', 'BJ1', 'CH1'),
	(3, '深圳1', 'SZ1', 'CH1');

db2-init.sql

-- for db2

drop table city2;

CREATE TABLE `city2` (
  `id` int(11) NOT NULL primary key,
  `name` varchar(32) DEFAULT NULL,
  `state` varchar(32) DEFAULT NULL,
  `country` varchar(32) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `city2` (`id`, `name`, `state`, `country`)
VALUES
	(1, '广州2', 'GZ2', 'CH2'),
	(2, '北京2', 'BJ2', 'CH2'),
	(3, '深圳2', 'SZ2', 'CH2');

代码演示

此项目主要核心代码如下（其他代码查看文章：Mysql和Mybatis+XML用法详解，此项目是在这篇文章基础上修改而来）

1. 配置application.yml（这里我定义了两个源master和slave）

spring:
  datasource: 
    master: 
      jdbc-url: jdbc:mysql://192.168.1.1:33061/cfdb?useUnicode=true&autoReconnect=true&allowMultiQueries=true&useSSL=false
      username: root
      password: 123456
      driver-class-name: com.mysql.jdbc.Driver
      # 使用默认hikari连接池
      type: com.zaxxer.hikari.HikariDataSource
      minimum-idle: 5
      maximum-pool-size: 15
      pool-name: MyHikariCPOfMaster
      max-lifetime: 1800000
      connection-timeout: 20000
      connection-test-query: SELECT 1
      validation-timeout: 5000
    slave: 
      jdbc-url: jdbc:mysql://192.168.1.1:33062/cfdb?useUnicode=true&autoReconnect=true&allowMultiQueries=true&useSSL=false
      username: root
      password: 123456
      driver-class-name: com.mysql.jdbc.Driver
      # 使用默认hikari连接池
      type: com.zaxxer.hikari.HikariDataSource
      minimum-idle: 5
      maximum-pool-size: 15
      pool-name: MyHikariCPOfSlave
      max-lifetime: 1800000
      connection-timeout: 20000
      connection-test-query: SELECT 1
      validation-timeout: 5000
server:
  port: 9090
mybatis: 
  config-location: classpath:mybatis-config.xml

2. CityMapper.xml文件

	
		select * from city1
	
	
	
		select * from city2
	

3. 多数据源使用的几个类

DataSourceConfig类

package com.md.demo.dao.base.datasource;

import javax.sql.DataSource;

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;

@Configuration
public class DataSourceConfig {

	@Primary
	@Qualifier("master")
	@Bean(name = "master")
	@ConfigurationProperties(prefix = "spring.datasource.master") // application.yml中对应属性的前缀
	public DataSource masterDataSource() {
		return DataSourceBuilder.create().build();
	}

	@Qualifier("slave")
	@Bean(name = "slave")
	@ConfigurationProperties(prefix = "spring.datasource.slave") // application.yml中对应属性的前缀
	public DataSource slaveDataSource() {
		return DataSourceBuilder.create().build();
	}
}

MybatisDbAConfig类

package com.md.demo.dao.base.datasource;

import javax.sql.DataSource;

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.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

@Configuration
@MapperScan(basePackages = {"mybatis.mapper"}, sqlSessionFactoryRef = "sqlSessionFactory1")
public class MybatisDbAConfig {

	private String localMapper = "classpath:mybatis/mapper/*.xml";
	
    @Autowired
    @Qualifier("master")
    private DataSource ds1;

    @Bean
    public SqlSessionFactory sqlSessionFactory1() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(ds1); // 使用master数据源, 连接master库
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(localMapper));
        return factoryBean.getObject();
    }

    @Bean(name = "masterSessionTemplate")
    public SqlSessionTemplate sqlSessionTemplate1() throws Exception {
        SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory1()); // 使用上面配置的Factory
        return template;
    }
}

MybatisDbBConfig类

package com.md.demo.dao.base.datasource;

import javax.sql.DataSource;

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.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

@Configuration
@MapperScan(basePackages = { "mybatis.mapper" }, sqlSessionFactoryRef = "sqlSessionFactory2")
public class MybatisDbBConfig {
	
	private String localMapper = "classpath:mybatis/mapper/*.xml";
	
	@Autowired
	@Qualifier("slave")
	private DataSource ds2;

	@Bean
	public SqlSessionFactory sqlSessionFactory2() throws Exception {
		SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
		factoryBean.setDataSource(ds2);
		factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(localMapper));
		return factoryBean.getObject();
	}

	@Bean(name = "slaveSessionTemplate")
	public SqlSessionTemplate sqlSessionTemplate2() throws Exception {
		SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory2());
		return template;
	}
}

4. 编写基类：BaseDao类

package com.md.demo.dao.base;

import javax.annotation.Resource;

import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;

public abstract class BaseDao {
	
	/**
	 * 默认库-主库
	 */
	@Resource(name = "masterSessionTemplate")
	@Autowired
	public SqlSessionTemplate sqlSessionTemplateOfMaster;
	
	/**
	 * 灾备库-用作读库
	 */
	@Resource(name = "slaveSessionTemplate")
	@Autowired
	public SqlSessionTemplate sqlSessionTemplateOfSlave;
}

5. 编写Dao类

接口

package com.md.demo.dao;

import java.util.List;

import com.md.demo.vo.CityVo;

public interface CityDao {

	public List listCities111();

	public List listCities222();

}

实现类（继承了BaseDao）

package com.md.demo.dao.impl;

import java.util.List;

import org.springframework.stereotype.Component;

import com.md.demo.dao.CityDao;
import com.md.demo.dao.base.BaseDao;
import com.md.demo.vo.CityVo;

@Component
public class CityDaoImpl extends BaseDao implements CityDao {

	@Override
	public List listCities111() {
		return this.sqlSessionTemplateOfMaster.selectList("listCities111");
	}

	@Override
	public List listCities222() {
		return this.sqlSessionTemplateOfSlave.selectList("listCities222");
	}

}

6. 编写Service类

接口

package com.md.demo.service;

import java.util.List;
import com.md.demo.vo.CityVo;

public interface CityService {

	public List listCities111();

	public List listCities222();
}

实现类

package com.md.demo.service.impl;

import java.util.List;

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

import com.md.demo.dao.CityDao;
import com.md.demo.service.CityService;
import com.md.demo.vo.CityVo;

@Service
public class CityServiceImpl implements CityService {

	@Autowired
	private CityDao cityDao;

	/**
	 * 获得城市1列表
	 */
	@Override
	public List listCities111() {
		return this.cityDao.listCities111();
	}

	/**
	 * 获得城市2列表
	 */
	@Override
	public List listCities222() {
		return this.cityDao.listCities222();
	}

}

7. 编写接口访问层

package com.md.demo.rest;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.md.demo.service.CityService;
import com.md.demo.util.JsonResult;
import com.md.demo.util.ResultCode;
import com.md.demo.vo.CityVo;

/**
 * @author Minbo
 */
@RestController
public class InitRest {

	protected static Logger logger = LoggerFactory.getLogger(InitRest.class);

	@Autowired
	private CityService cityService;

	/**
	 * http://localhost:9090/hello
	 * 
	 * @return
	 */
	@GetMapping("/hello")
	public String hello() {
		return "Hello greetings from spring-boot2-mysql-multi-datasource";
	}

	/**
	 * http://localhost:9090/listCities111
	 * 
	 * @return
	 */
	@GetMapping("/listCities111")
	public JsonResult listCities111() {
		List list = this.cityService.listCities111();
		return new JsonResult(ResultCode.SUCCESS, list);
	}

	/**
	 * http://localhost:9090/listCities222
	 * 
	 * @return
	 */
	@GetMapping("/listCities222")
	public JsonResult listCities222() {
		List list = this.cityService.listCities222();
		return new JsonResult(ResultCode.SUCCESS, list);
	}
}

完整源码下载

我的Github源码地址：

https://github.com/hemin1003/spring-boot-study/tree/master/spring-boot2-study/spring-boot2-parent

官方资料

SpringBoot配置多数据源

HikariCP源码项目

附加说明

问题1：多数据源配置，项目加载是否生效？

答案1：在项目启动加载时，可以查看日志是否已生效

问题2：hikari连接池配置，如何验证是否生效？

答案2：在访问各接口时，可以查看日志是否已生效

问题3：hikari连接池配置，常用参数的含义是？

## 最小空闲连接数量
minimum-idle=5
## 连接池最大连接数，默认是10
maximum-pool-size=15
## 连接池名称
pool-name=MyHikariCPOfMaster
## 此属性控制池中连接的最长生命周期，值0表示无限生命周期，默认1800000即30分钟
max-lifetime=1800000
## 数据库连接超时时间,默认30秒，即30000
connection-timeout=20000
## 空闲连接存活最大时间，默认600000（10分钟）
idle-timeout=180000
## 此属性控制从池返回的连接的默认自动提交行为,默认值：true
auto-commit=true

下一章教程

SpringBoot从入门到精通教程（八）- 多环境配置文件用法

该系列教程

SpringBoot从入门到精通教程

 

 

 

至此，全部介绍就结束了

 

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