springboot + mybatis + druid + 多数据源

druid

阿里云计算平台DataWorks(https://help.aliyun.com/document_detail/137663.html) 团队出品，为监控而生的数据库连接池

项目地址：https://gitcode.com/gh_mirrors/druid/druid

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43950人浏览 · 2018-08-17 15:24:50

请叫我猿叔叔 · 2018-08-17 15:24:50 发布

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

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>datasources</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>datasources</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-parameter-names</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <!-- 分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>

        <!-- alibaba的druid数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!-- atomikos transaction management -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jta-atomikos</artifactId>
        </dependency>

        <!-- swagger -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.6.1</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.6.1</version>
        </dependency>
        <!-- swagger -->


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

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<User> 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<Role> 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<User> 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<Role> 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<User> 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<Role> 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<User> 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<Role> selectRoleList();

    void saveRole(Role role);
}

3.9 mapper.xml

3.9.1 db1的UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.example.datasources.mapper.db1.UserMapper" >

    <resultMap id="BaseResultMap" type="com.example.datasources.entity.db1.User" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="name" property="name" jdbcType="VARCHAR" />
    </resultMap>


    <sql id="Base_Column_List" >
        id, `name`
    </sql>


    <select id="selectUserList" resultMap="BaseResultMap"  >
        SELECT
          <include refid="Base_Column_List" />
        FROM `user`
    </select>


    <insert id="saveUser" parameterType="com.example.datasources.entity.db1.User">
        INSERT INTO `user`
           (id, `name`)
        VALUES
           ( #{id}, #{name} )
    </insert>

</mapper>

3.9.2 db2的RoleMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.example.datasources.mapper.db2.RoleMapper" >

    <resultMap id="BaseResultMap" type="com.example.datasources.entity.db2.Role" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="name" property="name" jdbcType="VARCHAR" />
    </resultMap>

    <sql id="Base_Column_List" >
        id, name
    </sql>

    <select id="selectRoleList" resultMap="BaseResultMap"  >
        SELECT
          <include refid="Base_Column_List" />
        FROM
          role
    </select>


    <insert id="saveRole" parameterType="com.example.datasources.entity.db2.Role">
        INSERT INTO `role`
           (id, `name`)
        VALUES
           ( #{id}, #{name} )
    </insert>

</mapper>

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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阿里云计算平台DataWorks(https://help.aliyun.com/document_detail/137663.html) 团队出品，为监控而生的数据库连接池

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f060c270 - 6 天前

1613a765 * Improve gaussdb ddl parser * fix temp table 7 天前

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