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Spring Boot + Mybatis-Plus实现多数据源的方法

作者：Aben·Chen

这篇文章主要介绍了Spring Boot + Mybatis-Plus实现多数据源的方法，本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

前段时间写了一篇基于mybatis实现的多数据源博客。感觉不是很好，这次打算加入git，来搭建一个基于Mybatis-Plus的多数据源项目
Mybatis-Plus就是香

前言：该项目分为master数据源与local数据源。假定master数据源为线上数据库，local为本地数据库。后续我们将通过xxl-job的方式，将线上(master)中的数据同步到本地(local)中

项目git地址 抽时间把项目提交到git仓库，方便大家直接克隆
sql文件已置于项目中，数据库使用的mysql

创建项目

我这里使用的idea，正常创建spring boot项目就行了。

sql 

-- 创建master数据库
CREATE DATABASE db_master;

USE db_master;
-- 用户表
CREATE TABLE users(
	id INT PRIMARY KEY AUTO_INCREMENT COMMENT '主键id',
	username VARCHAR(20) NOT NULL COMMENT '用户名',
	pwd VARCHAR(50) NOT NULL COMMENT '密码',
	phone CHAR(11) NOT NULL COMMENT '手机号',
	email VARCHAR(50) COMMENT '邮箱',
	gender CHAR(1) COMMENT '性别 1-->男 0-->女',
	age INT COMMENT '年龄',
	created_time TIMESTAMP NULL DEFAULT NULL COMMENT '创建时间',
	updated_time TIMESTAMP NULL DEFAULT NULL COMMENT '修改时间',
	deleted_time TIMESTAMP NULL DEFAULT NULL COMMENT '删除时间',
	type INT DEFAULT 1 COMMENT '状态 1-->启用 2-->禁用 3-->软删除'
)ENGINE=INNODB;

INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('supperAdmin','admin123','13000000000','super@admin.com',1,20); 
INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('admin','admin','13200840033','admin@163.com',0,14); 
INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('wanggang','wanggang','13880443322','wang@gang.cn',1,36); 
INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('xiaobao','xiaobao','18736450102','xiao@bao.com',0,22); 
INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('zhaoxing','zhaoxing','18966004400','zhao@xing.com',1,29); 
INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('chenyun','chenyun','13987613540','chen@yun.com',1,25); 
INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('ouyangruixue','ouyangruixue','15344773322','ouyang@163.com',0,24); 

-- 创建local数据库
CREATE DATABASE db_local;

USE db_local;
-- 本地库用户表
CREATE TABLE users(
	id INT PRIMARY KEY AUTO_INCREMENT COMMENT '主键id',
	username VARCHAR(20) NOT NULL COMMENT '用户名',
	pwd VARCHAR(50) NOT NULL COMMENT '密码',
	phone CHAR(11) NOT NULL COMMENT '手机号',
	email VARCHAR(50) COMMENT '邮箱',
	gender CHAR(1) COMMENT '性别 1-->男 0-->女',
	age INT COMMENT '年龄',
	created_time TIMESTAMP NULL DEFAULT NULL COMMENT '创建时间',
	updated_time TIMESTAMP NULL DEFAULT NULL COMMENT '修改时间',
	deleted_time TIMESTAMP NULL DEFAULT NULL COMMENT '删除时间',
	type INT DEFAULT 1 COMMENT '状态 1-->启用 2-->禁用 3-->软删除'
)ENGINE=INNODB;
-- 本地库测试表
CREATE TABLE local_test(
	id INT PRIMARY KEY AUTO_INCREMENT,
	str VARCHAR(20)
)ENGINE=INNODB;
INSERT INTO local_test(str) VALUES ('Hello');
INSERT INTO local_test(str) VALUES ('World');
INSERT INTO local_test(str) VALUES ('Mysql');
INSERT INTO local_test(str) VALUES ('^.^');

pom文件

目前只引入了lombok、mybatis-plus、mysql相关的依赖

	<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
		<!-- lombok -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <!-- Mybatis-Plus -->
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.2.0</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>

application.yml

properties删除，yml创建。其实无所谓yml还是properties

server:
 port: 8001

spring:
 datasource:
  master:
   url: jdbc:mysql://localhost:3306/db_master?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai&allowMultiQueries=true
   username: root
   password: 123456
   driver-class-name: com.mysql.cj.jdbc.Driver

  local:
   url: jdbc:mysql://localhost:3306/db_local?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai&allowMultiQueries=true
   username: root
   password: 123456
   driver-class-name: com.mysql.cj.jdbc.Driver

mybatis-plus:
 mapper-locations: classpath:mappers/*/*Mapper.xml
 #实体扫描，多个package用逗号或者分号分隔
 typeAliasesPackage: com.niuniu.sys.module
 check-config-location: true
 configuration:
  #是否开启自动驼峰命名规则（camel case）映射
  map-underscore-to-camel-case: true
  #全局地开启或关闭配置文件中的所有映射器已经配置的任何缓存
  cache-enabled: false
  call-setters-on-nulls: true
  #配置JdbcTypeForNull, oracle数据库必须配置
  jdbc-type-for-null: 'null'
  #MyBatis 自动映射时未知列或未知属性处理策略 NONE：不做任何处理 (默认值), WARNING：以日志的形式打印相关警告信息, FAILING：当作映射失败处理，并抛出异常和详细信息
  auto-mapping-unknown-column-behavior: warning
 global-config:
  banner: false
  db-config:
   #主键类型 0:"数据库ID自增", 1:"未设置主键类型",2:"用户输入ID (该类型可以通过自己注册自动填充插件进行填充)", 3:"全局唯一ID (idWorker), 4:全局唯一ID (UUID), 5:字符串全局唯一ID (idWorker 的字符串表示)";
   id-type: auto
   #字段验证策略 IGNORED:"忽略判断", NOT_NULL:"非NULL判断", NOT_EMPTY:"非空判断", DEFAULT 默认的,一般只用于注解里(1. 在全局里代表 NOT_NULL,2. 在注解里代表 跟随全局)
   field-strategy: NOT_EMPTY
   #数据库大写下划线转换
   capital-mode: true
   #逻辑删除值
   logic-delete-value: 0
   #逻辑未删除值
   logic-not-delete-value: 1

pagehelper:            #pagehelper分页插件
 helperDialect: mysql     #设置数据库方言
 reasonable: true
 supportMethodsArguments: true
 params: count=countSql

目录结构

由于该项目分为两个数据源。在各个分层中，你将分别见到master、local。

在这里插入图片描述

备注：由于users表在两个数据源中完全相同，将Users实体置于model层公用

关键代码

在config包中，我们需要对master、local的数据源进行配置，使其可以通过不同的请求，自动切换数据源

另外 由于该项目使用mybatis-plus，在创建SqlSessionFactory的时候，请使用MybatisSqlSessionFactoryBean进行bean对象的创建

在这里插入图片描述

local数据源 

package com.demo.config;

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.zaxxer.hikari.HikariDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.demo.dao.local",
    sqlSessionFactoryRef = "localSqlSessionFactory")
public class LocalDataSourceConfig {
  @Value("${spring.datasource.local.driver-class-name}")
  private String driverClassName;
  @Value("${spring.datasource.local.url}")
  private String url;
  @Value("${spring.datasource.local.username}")
  private String username;
  @Value("${spring.datasource.local.password}")
  private String password;

  @Bean(name = "localDataSource")
  public DataSource localDataSource() {
    HikariDataSource dataSource = new HikariDataSource();
    dataSource.setUsername(username);
    dataSource.setPassword(password);
    dataSource.setJdbcUrl(url);
    dataSource.setDriverClassName(driverClassName);
    dataSource.setMaximumPoolSize(10);
    dataSource.setMinimumIdle(5);
    dataSource.setPoolName("localDataSourcePool");
    return dataSource;
  }

  /**
   * local数据源
   */
  @Bean(name = "localSqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(@Qualifier("localDataSource") DataSource dataSource) throws Exception {
    MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    // 设置Mybatis全局配置路径
    bean.setConfigLocation(new ClassPathResource("mybatis-config.xml"));
    bean.setMapperLocations(
        new PathMatchingResourcePatternResolver().getResources("classpath*:mappers/local/*.xml"));
    return bean.getObject();
  }

  @Bean(name = "localTransactionManager")
  public DataSourceTransactionManager transactionManager(@Qualifier("localDataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }

  @Bean(name = "localSqlSessionTemplate")
  public SqlSessionTemplate testSqlSessionTemplate(
      @Qualifier("localSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    return new SqlSessionTemplate(sqlSessionFactory);
  }
}

master数据源

package com.demo.config;

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.zaxxer.hikari.HikariDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.demo.dao.master",
    sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDataSourceConfig {
  @Value("${spring.datasource.master.driver-class-name}")
  private String driverClassName;
  @Value("${spring.datasource.master.url}")
  private String url;
  @Value("${spring.datasource.master.username}")
  private String username;
  @Value("${spring.datasource.master.password}")
  private String password;

  @Bean(name = "masterDataSource")
  @Primary
  public DataSource masterDataSource() {
    HikariDataSource dataSource = new HikariDataSource();
    dataSource.setUsername(username);
    dataSource.setPassword(password);
    dataSource.setJdbcUrl(url);
    dataSource.setDriverClassName(driverClassName);
    dataSource.setMaximumPoolSize(10);
    dataSource.setMinimumIdle(5);
    dataSource.setPoolName("masterDataSource");
    return dataSource;
  }


  /**
   * master数据源
   */
  @Bean(name = "masterSqlSessionFactory")
  @Primary
  public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
    MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    bean.setConfigLocation(new ClassPathResource("mybatis-config.xml"));
    bean.setMapperLocations(
        new PathMatchingResourcePatternResolver().getResources("classpath*:mappers/master/*.xml"));
    return bean.getObject();
  }

  @Bean(name = "masterTransactionManager")
  @Primary
  public DataSourceTransactionManager transactionManager(@Qualifier("masterDataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }

  @Bean(name = "masterSqlSessionTemplate")
  @Primary
  public SqlSessionTemplate testSqlSessionTemplate(
      @Qualifier("masterSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    return new SqlSessionTemplate(sqlSessionFactory);
  }
}

部分代码

Users实体类

package com.demo.model;

import lombok.Data;
import java.util.Date;

@Data
public class Users {
  private Integer id;
  private String username;
  private String pwd;
  private String phone;
  private String email;
  private Integer gender;
  private Integer age;
  private Date created_time;
  private Date updated_time;
  private Date deleted_time;
  private Integer type;
}

UsersMapper

package com.demo.dao.master;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.demo.model.Users;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UsersMapper extends BaseMapper<Users> {
}

UsersService

package com.demo.service.master;

import com.baomidou.mybatisplus.extension.service.IService;
import com.demo.model.Users;

public interface UsersService extends IService<Users> {
}

UsersServiceImpl

package com.demo.service.master.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.demo.dao.master.UsersMapper;
import com.demo.model.Users;
import com.demo.service.master.UsersService;
import org.springframework.stereotype.Service;

@Service
public class UsersServiceImpl extends ServiceImpl<UsersMapper, Users> implements UsersService {
}

UsersController

package com.demo.controller.master;

import com.demo.model.Users;
import com.demo.service.master.UsersService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/master")
public class UsersController {
  @Autowired
  private UsersService userssService;
  
  @RequestMapping("/users")
  public List<Users> list() {
    return userssService.list();
  }
}

最终的项目结构

在这里插入图片描述

运行结果

在这里插入图片描述
在这里插入图片描述

至此Spring Boot + Mybatis-Plus已经完成了多数据源的实现。
最后再写一点我遇到的坑吧
1、master与local中不要出现同名的文件
2、数据源配置中SqlSessionFactoryBean替换为MybatisSqlSessionFactoryBean

下一篇将会围绕xxl-job任务调度中心，介绍如何通过xxl-job实现本地库与线上库的定时同步

到此这篇关于Spring Boot + Mybatis-Plus实现多数据源的文章就介绍到这了,更多相关Spring Boot Mybatis-Plus多数据源内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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