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
非特殊说明，本文版权归 朝雾轻寒 所有，转载请注明出处.
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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