一. 简介
俩个数据库db1,db2， db1数据库的mapper.xml和db2数据库的mapper.xml分别放到不同的目录下, 通过给不同的目录配置不同的数据源，并分别监控各自的事务。
已有新版方案： Mybatis Plus整合多数据源和读写分离，请使用新版；
二. sql脚本
db1数据库的user表：
CREATE TABLE `user` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
db2数据库的role表：
CREATE TABLE `role` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
三. 工程搭建
3.1 目录结构图
3.2 pom.xml文件
4.0.0 com.example datasources 0.0.1-SNAPSHOT jar datasources Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 2.0.4.RELEASE UTF-8 UTF-8 1.8 org.springframework.boot spring-boot-starter-web org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.2 mysql mysql-connector-java runtime org.springframework.boot spring-boot-starter-test test org.apache.commons commons-lang3 3.4 com.fasterxml.jackson.core jackson-core com.fasterxml.jackson.core jackson-databind com.fasterxml.jackson.datatype jackson-datatype-joda com.fasterxml.jackson.module jackson-module-parameter-names org.springframework.boot spring-boot-starter-aop com.github.pagehelper pagehelper-spring-boot-starter 1.2.5 com.alibaba druid-spring-boot-starter 1.1.9 org.springframework.boot spring-boot-starter-thymeleaf org.springframework.boot spring-boot-starter-jdbc org.springframework.boot spring-boot-starter-jta-atomikos io.springfox springfox-swagger2 2.6.1 io.springfox springfox-swagger-ui 2.6.1 org.springframework.boot spring-boot-maven-plugin
3.3 application.yml
server:
port: 8080
spring:
datasource:
db1:
driverClassName: com.mysql.jdbc.Driver
username: 用户名
password: 密码
# spring2.0此处为jdbc-url
jdbc-url: jdbc:mysql://IP:3306/db1?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
type: com.alibaba.druid.pool.DruidDataSource
db2:
driverClassName: com.mysql.jdbc.Driver
username: 用户名
password: 密码
# spring2.0此处为jdbc-url
jdbc-url: jdbc:mysql://IP:3306/db2?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
type: com.alibaba.druid.pool.DruidDataSource
3.4 数据源配置类
3.4.1 db1数据库的数据源 （主数据源@Primary）
package com.example.datasources.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.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;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.example.datasources.mapper.db1", sqlSessionTemplateRef = "db1SqlSessionTemplate")
public class DataSource1Config {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.db1")
@Primary
public DataSource db1DataSource() {
return DataSourceBuilder.create().build();
}
@Bean
@Primary
public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/example/datasources/mapper/db1/*.xml"));
return bean.getObject();
}
@Bean
@Primary
public DataSourceTransactionManager db1TransactionManager(@Qualifier("db1DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean
@Primary
public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
3.4.2 db2数据库的数据源
package com.example.datasources.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.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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.example.datasources.mapper.db2", sqlSessionTemplateRef = "db2SqlSessionTemplate")
public class DataSource2Config {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.db2")
public DataSource db2DataSource() {
return DataSourceBuilder.create().build();
}
@Bean
public SqlSessionFactory db2SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/example/datasources/mapper/db2/*.xml"));
return bean.getObject();
}
@Bean
public DataSourceTransactionManager db2TransactionManager(@Qualifier("db2DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean
public SqlSessionTemplate db2SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
3.5 Controller
3.5.1 db1的UserController
package com.example.datasources.controller;
import com.example.datasources.entity.db1.User;
import com.example.datasources.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/select/list")
public List selectUserList() {
return this.userService.selectUserList();
}
@GetMapping("/save")
public void saveUser(User user) {
this.userService.saveUser(user);
}
}
3.5.2 db2的RoleController
package com.example.datasources.controller;
import com.example.datasources.entity.db2.Role;
import com.example.datasources.service.RoleService;
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("/role")
public class RoleController {
@Autowired
private RoleService roleService;
@GetMapping("/select/list")
public List selectRoleList() {
return this.roleService.selectRoleList();
}
@GetMapping("/save")
public void saveRole(Role role) {
this.roleService.saveRole(role);
}
}
3.6 Service
3.6.1 db1的UserService
package com.example.datasources.service;
import com.example.datasources.entity.db1.User;
import java.util.List;
public interface UserService {
List selectUserList();
void saveUser(User user);
}
3.6.2 db2的RoleService
package com.example.datasources.service;
import com.example.datasources.entity.db2.Role;
import java.util.List;
public interface RoleService {
List selectRoleList();
void saveRole(Role role);
}
3.7 serviceImpl
3.7.1 db1的UserServiceImpl
package com.example.datasources.service.impl;
import com.example.datasources.entity.db1.User;
import com.example.datasources.mapper.db1.UserMapper;
import com.example.datasources.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public List selectUserList() {
return this.userMapper.selectUserList();
}
@Transactional
@Override
public void saveUser(User user) {
this.userMapper.saveUser(user);
// throw new RuntimeException();
}
}
3.7.2 db2的RoleServiceImpl
package com.example.datasources.service.impl;
import com.example.datasources.entity.db2.Role;
import com.example.datasources.mapper.db2.RoleMapper;
import com.example.datasources.service.RoleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
public class RoleServiceImpl implements RoleService {
@Autowired
private RoleMapper roleMapper;
@Override
public List selectRoleList() {
return this.roleMapper.selectRoleList();
}
// 注：不是主数据源必须要声明其数据源，否则事务不起作用
@Transactional(value = "db2TransactionManager")
@Override
public void saveRole(Role role) {
this.roleMapper.saveRole(role);
// throw new RuntimeException();
}
}
3.8 mapper
3.8.1 db1的UserMapper
package com.example.datasources.mapper.db1;
import com.example.datasources.entity.db1.User;
import java.util.List;
public interface UserMapper {
List selectUserList();
void saveUser(User user);
}
3.8.2 db2的RoleMapper
package com.example.datasources.mapper.db2;
import com.example.datasources.entity.db2.Role;
import java.util.List;
public interface RoleMapper {
List selectRoleList();
void saveRole(Role role);
}
3.9 mapper.xml
3.9.1 db1的UserMapper.xml
id, `name` INSERT INTO `user` (id, `name`) VALUES ( #{id}, #{name} )
3.9.2 db2的RoleMapper.xml
id, name INSERT INTO `role` (id, `name`) VALUES ( #{id}, #{name} )
3.10 entity
3.10.1 db1的User
package com.example.datasources.entity.db1;
public class User {
private Integer id;
private String name;
public User() {
}
public User(Integer id, String name) {
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
3.10.2 db2的Role
package com.example.datasources.entity.db2;
public class Role {
private Integer id;
private String name;
public Role() {
}
public Role(Integer id, String name) {
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
3.11 启动类
package com.example.datasources;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DatasourcesApplication {
public static void main(String[] args) {
SpringApplication.run(DatasourcesApplication.class, args);
}
}
四. 测试
可以直接在浏览器测试，测试事务的时候可以将异常打开。
需要注意的是： 非主数据源必须要在@Transactional注解中指定数据源，否则事务不起作用。主数据库不需要。
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