Spring Boot 2.X(五):MyBatis 多数据源配置

前言

MyBatis 多数据源配置,最近在项目建设中,需要在原有系统上扩展一个新的业务模块,特意将数据库分库,以便减少复杂度。本文直接以简单的代码示例,如何对 MyBatis 多数据源配置。

准备

创建数据库
db_test

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for t_user
-- ----------------------------
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user` (
  `id` int(8) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `user_name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '用户姓名',
  `user_sex` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '用户性别',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=23 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of t_user
-- ----------------------------
BEGIN;
INSERT INTO `t_user` VALUES (1, '刘备', '男');
INSERT INTO `t_user` VALUES (2, '孙尚香', '女');
INSERT INTO `t_user` VALUES (3, '周瑜', '男');
INSERT INTO `t_user` VALUES (4, '小乔', '女');
INSERT INTO `t_user` VALUES (5, '诸葛亮', '男');
INSERT INTO `t_user` VALUES (6, '黄月英', '女');
INSERT INTO `t_user` VALUES (7, '关羽', '男');
INSERT INTO `t_user` VALUES (8, '张飞', '男');
INSERT INTO `t_user` VALUES (9, '赵云', '男');
INSERT INTO `t_user` VALUES (10, '黄总', '男');
INSERT INTO `t_user` VALUES (11, '曹操', '男');
INSERT INTO `t_user` VALUES (12, '司马懿', '男');
INSERT INTO `t_user` VALUES (13, '貂蝉', '女');
INSERT INTO `t_user` VALUES (14, '吕布', '男');
INSERT INTO `t_user` VALUES (15, '马超', '男');
INSERT INTO `t_user` VALUES (16, '魏延', '男');
INSERT INTO `t_user` VALUES (17, '孟获', '男');
INSERT INTO `t_user` VALUES (18, '大乔', '女');
INSERT INTO `t_user` VALUES (19, '刘婵', '男');
INSERT INTO `t_user` VALUES (20, '姜维', '男');
INSERT INTO `t_user` VALUES (21, '廖化', '男');
INSERT INTO `t_user` VALUES (22, '关平', '男');
COMMIT;
SET FOREIGN_KEY_CHECKS = 1;

dbb_test2


SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for t_hero
-- ----------------------------
DROP TABLE IF EXISTS `t_hero`;
CREATE TABLE `t_hero` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `hero_code` varchar(32) DEFAULT NULL COMMENT '英雄编码',
  `hero_name` varchar(20) DEFAULT NULL COMMENT '英雄名称',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of t_hero
-- ----------------------------
BEGIN;
INSERT INTO `t_hero` VALUES (1, '001', '德玛西亚');
COMMIT;

SET FOREIGN_KEY_CHECKS = 1;

构建项目,项目目录结构

pom 文件



    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.9.RELEASE
         
    
    cn.zwqh
    spring-boot-mybatis-mulidatasource
    0.0.1-SNAPSHOT
    spring-boot-mybatis-mulidatasource
    spring-boot-mybatis-mulidatasource

    
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            org.springframework.boot
            spring-boot-starter-jdbc
        
        
        
        
            org.springframework.boot
            spring-boot-devtools
            true 
        
                
        
        
            mysql
            mysql-connector-java
            runtime
        
        
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.1.0
        
        
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.20
        
        
        
        
            com.github.pagehelper
            pagehelper-spring-boot-starter
            1.2.12
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    


这里使用了alibaba的druid数据库连接池,Druid 能够提供强大的监控和扩展功能。这里我们暂时只做简单的应用。

配置文件

#master 数据源配置
master.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
master.datasource.url=jdbc:mysql://127.0.0.1:3306/db_test?useUnicode=true&characterEncoding=UTF-8&useSSL=true
master.datasource.username=root
master.datasource.password=zwqh@0258
#slave 数据源配置
slave.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
slave.datasource.url=jdbc:mysql://127.0.0.1:3306/db_test2?useUnicode=true&characterEncoding=UTF-8&useSSL=true
slave.datasource.username=root
slave.datasource.password=zwqh@0258
#mybatis
mybatis.mapper-locations=classpath:/mapper/**/*Mapper.xml

数据源配置

MasterDataSourceConfig 对应数据库 db_test

@Configuration
@MapperScan(basePackages = "cn.zwqh.springboot.dao.master", sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDataSourceConfig {
    @Value("${master.datasource.driver-class-name}")
    private String driverClassName;

    @Value("${master.datasource.url}")
    private String url;

    @Value("${master.datasource.username}")
    private String username;

    @Value("${master.datasource.password}")
    private String password;

    @Bean(name = "masterDataSource")
    @Primary
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(this.driverClassName);
        dataSource.setUrl(this.url);
        dataSource.setUsername(this.username);
        dataSource.setPassword(this.password);
        return dataSource;
    }

    @Bean(name = "masterSqlSessionFactory")
    @Primary
    public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:/mapper/master/*Mapper.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);
    }
}

SlaveDataSourceConfig 对应数据库 db_test2

@Configuration
@MapperScan(basePackages = "cn.zwqh.springboot.dao.slave", sqlSessionFactoryRef = "slaveSqlSessionFactory")
public class SlaveDataSourceConfig {
    @Value("${slave.datasource.driver-class-name}")
    private String driverClassName;

    @Value("${slave.datasource.url}")
    private String url;

    @Value("${slave.datasource.username}")
    private String username;

    @Value("${slave.datasource.password}")
    private String password;

    @Bean(name = "slaveDataSource")
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(this.driverClassName);
        dataSource.setUrl(this.url);
        dataSource.setUsername(this.username);
        dataSource.setPassword(this.password);
        return dataSource;
    }

    @Bean(name = "slaveSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("slaveDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:/mapper/slave/*Mapper.xml"));
        return bean.getObject();
    }

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

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

多个数据源在使用的过程中必须指定主库,不然会报错。
@MapperScan(basePackages = "cn.zwqh.springboot.dao.slave") 指定对应 Dao 层的扫描路径。

dao 层和 xml 层

db_test 数据库的 dao 层在 cn.zwqh.springboot.dao.master 包下,db_test2 数据库的 dao 层在 cn.zwqh.springboot.dao.slave 包下。

UserDao

public interface UserDao {

    List getAll();

}

HeroDao

public interface HeroDao {

    List getAllHero();

}

db_test 数据库的 xml 层在 /mapper/master/ 文件路径下,db_test2 数据库的 xml 层在 /mapper/slave/ 文件路径下。

UserMapper.xml




    
        
        
        
    
    
    

HeroMapper.xml




    
        
        
        
    
    
    

测试

测试可以使用 SpringBootTest,也可以放到 Controller中,个人习惯用 Controller。

@RestController
@RequestMapping("/test")
public class TestController {
    
    @Autowired
    private UserDao userDao;
    @Autowired
    private HeroDao heroDao;
    
    /**
     *  查找所有用户
     * @return
     */
    @RequestMapping("/getAllUser")
    public List getAllUser(){
        return userDao.getAll(); 
    }
    /**
     *  查找所有英雄
     * @return
     */
    @RequestMapping("/getAllHero")
    public List getAllHero(){
        return heroDao.getAllHero();
    }
    
}

浏览器直接访问:http://127.0.0.1:8080/test/ 加上相关测试路径即可。

总结

多数据源一般用于主从模式或者按业务分库。

示例代码

github
码云

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原文标题:Spring Boot 2.X(五):MyBatis 多数据源配置

原文地址:https://www.zwqh.top/article/info/12

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