SpringBoot系列 - 多数据源配置

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<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <druid.version>1.1.2</druid.version>
    <mysql-connector.version>8.0.7-dmr</mysql-connector.version>
    <mybatis-plus.version>2.1.8</mybatis-plus.version>
    <mybatisplus-spring-boot-starter.version>1.0.5</mybatisplus-spring-boot-starter.version>
</properties>

<dependencies>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>${mysql-connector.version}</version>
    <scope>runtime</scope>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>${druid.version}</version>
</dependency>
<!-- MyBatis plus增强和springboot的集成-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>${mybatis-plus.version}</version>
</dependency>
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatisplus-spring-boot-starter</artifactId>
    <version>${mybatisplus-spring-boot-starter.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.hamcrest</groupId>
    <artifactId>hamcrest-all</artifactId>
    <version>1.3</version>
    <scope>test</scope>
</dependency>
</dependencies>

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# -------------------------------------以下是pos业务库开始-------------------------------------------
CREATE
DATABASE IF NOT EXISTS pos default charset utf8 COLLATE utf8_general_ci;
SET
FOREIGN_KEY_CHECKS=0;
USE
pos;

-- 后台管理用户表
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user`
(
    `id`           INT(11) PRIMARY KEY AUTO_INCREMENT COMMENT '主键ID',
    `username`     VARCHAR(32) NOT NULL COMMENT '账号',
    `name`         VARCHAR(16)  DEFAULT '' COMMENT '名字',
    `password`     VARCHAR(128) DEFAULT '' COMMENT '密码',
    `salt`         VARCHAR(64)  DEFAULT '' COMMENT 'md5密码盐',
    `phone`        VARCHAR(32)  DEFAULT '' COMMENT '联系电话',
    `tips`         VARCHAR(255) COMMENT '备注',
    `state`        TINYINT(1) DEFAULT 1 COMMENT '状态 1:正常 2:禁用',
    `created_time` DATETIME     DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    `updated_time` DATETIME     DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='后台管理用户表';

#
下面是pos数据库中的插入数据
INSERT INTO `t_user` VALUES (1,'admin','系统管理员','123456','www', '17890908889', '系统管理员', 1, '2017-12-12 09:46:12', '2017-12-12 09:46:12');
INSERT INTO `t_user`
VALUES (2, 'aix', '张三', '123456', 'eee', '17859569358', '', 1, '2017-12-12 09:46:12', '2017-12-12 09:46:12');


# -------------------------------------以下biz业务库开始-------------------------------------------
CREATE
DATABASE IF NOT EXISTS pos default charset utf8 COLLATE utf8_general_ci;
SET
FOREIGN_KEY_CHECKS=0;
USE
biz;

-- 后台管理用户表
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user`
(
    `id`           INT(11) PRIMARY KEY AUTO_INCREMENT COMMENT '主键ID',
    `username`     VARCHAR(32) NOT NULL COMMENT '账号',
    `name`         VARCHAR(16)  DEFAULT '' COMMENT '名字',
    `password`     VARCHAR(128) DEFAULT '' COMMENT '密码',
    `salt`         VARCHAR(64)  DEFAULT '' COMMENT 'md5密码盐',
    `phone`        VARCHAR(32)  DEFAULT '' COMMENT '联系电话',
    `tips`         VARCHAR(255) COMMENT '备注',
    `state`        TINYINT(1) DEFAULT 1 COMMENT '状态 1:正常 2:禁用',
    `created_time` DATETIME     DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    `updated_time` DATETIME     DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='后台管理用户表';


#
下面是biz数据库中的插入数据
INSERT INTO `t_user` VALUES (1,'admin1','系统管理员','123456','www', '17890908889', '系统管理员', 1, '2017-12-12 09:46:12', '2017-12-12 09:46:12');
INSERT INTO `t_user`
VALUES (2, 'aix1', '张三', '123456', 'eee', '17859569358', '', 1, '2017-12-12 09:46:12', '2017-12-12 09:46:12');

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###################  自定义配置  ###################
xncoding:
  muti-datasource-open: true #是否开启多数据源(true/false)

###################  mybatis-plus配置  ###################
mybatis-plus:
  mapper-locations: classpath*:com/xncoding/pos/common/dao/repository/mapping/*.xml
  typeAliasesPackage: >
    com.xncoding.pos.common.dao.entity
  global-config:
    id-type: 0  # 0:数据库ID自增   1:用户输入id  2:全局唯一id(IdWorker)  3:全局唯一ID(uuid)
    db-column-underline: false
    refresh-mapper: true
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: true #配置的缓存的全局开关
    lazyLoadingEnabled: true #延时加载的开关
    multipleResultSetsEnabled: true #开启的话，延时加载一个属性时会加载该对象全部属性，否则按需加载属性

#默认数据源
spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/pos?useSSL=false&autoReconnect=true&tinyInt1isBit=false&useUnicode=true&characterEncoding=utf8
    username: root
    password: 123456

#多数据源
biz:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/biz?useSSL=false&autoReconnect=true&tinyInt1isBit=false&useUnicode=true&characterEncoding=utf8
    username: root
    password: 123456

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public interface DSEnum {
    String DATA_SOURCE_CORE = "dataSourceCore";         //核心数据源
    String DATA_SOURCE_BIZ = "dataSourceBiz";            //其他业务的数据源
}

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public class DataSourceContextHolder {

    private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();

    /**
     * @param dataSourceType 数据库类型
     * @Description: 设置数据源类型
     */
    public static void setDataSourceType(String dataSourceType) {
        contextHolder.set(dataSourceType);
    }

    /**
     * @Description: 获取数据源类型
     */
    public static String getDataSourceType() {
        return contextHolder.get();
    }

    /**
     * @Description: 清除数据源类型
     */
    public static void clearDataSourceType() {
        contextHolder.remove();
    }
}

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public class DynamicDataSource extends AbstractRoutingDataSource {

    @Override
    protected Object determineCurrentLookupKey() {
        return DataSourceContextHolder.getDataSourceType();
    }
}

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/**
 * 多数据源标识
 *
 * @author xiongneng
 */
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface DataSource {
    String name() default "";
}

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/**
 * 多数据源切换的aop
 *
 * @author xiongneng
 */
@Aspect
@Component
@ConditionalOnProperty(prefix = "xncoding", name = "muti-datasource-open", havingValue = "true")
public class MultiSourceExAop implements Ordered {

    private Logger log = Logger.getLogger(this.getClass());

    @Pointcut(value = "@annotation(com.xncoding.pos.common.annotion.DataSource)")
    private void cut() {

    }

    @Around("cut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {

        Signature signature = point.getSignature();
        MethodSignature methodSignature = null;
        if (!(signature instanceof MethodSignature)) {
            throw new IllegalArgumentException("该注解只能用于方法");
        }
        methodSignature = (MethodSignature) signature;

        Object target = point.getTarget();
        Method currentMethod = target.getClass().getMethod(methodSignature.getName(), methodSignature.getParameterTypes());

        DataSource datasource = currentMethod.getAnnotation(DataSource.class);
        if (datasource != null) {
            DataSourceContextHolder.setDataSourceType(datasource.name());
            log.debug("设置数据源为：" + datasource.name());
        } else {
            DataSourceContextHolder.setDataSourceType(DSEnum.DATA_SOURCE_CORE);
            log.debug("设置数据源为：dataSourceCore");
        }
        try {
            return point.proceed();
        } finally {
            log.debug("清空数据源信息！");
            DataSourceContextHolder.clearDataSourceType();
        }
    }


    /**
     * aop的顺序要早于spring的事务
     */
    @Override
    public int getOrder() {
        return 1;
    }

}

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@Configuration
@EnableTransactionManagement(order = 2)
@MapperScan(basePackages = {"com.xncoding.pos.common.dao.repository"})
public class MybatisPlusConfig {

    @Autowired
    DruidProperties druidProperties;

    @Autowired
    MutiDataSourceProperties mutiDataSourceProperties;

    /**
     * 核心数据源
     */
    private DruidDataSource coreDataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        druidProperties.config(dataSource);
        return dataSource;
    }

    /**
     * 另一个数据源
     */
    private DruidDataSource bizDataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        druidProperties.config(dataSource);
        mutiDataSourceProperties.config(dataSource);
        return dataSource;
    }

    /**
     * 单数据源连接池配置
     */
    @Bean
    @ConditionalOnProperty(prefix = "xncoding", name = "muti-datasource-open", havingValue = "false")
    public DruidDataSource singleDatasource() {
        return coreDataSource();
    }

    /**
     * 多数据源连接池配置
     */
    @Bean
    @ConditionalOnProperty(prefix = "xncoding", name = "muti-datasource-open", havingValue = "true")
    public DynamicDataSource mutiDataSource() {

        DruidDataSource coreDataSource = coreDataSource();
        DruidDataSource bizDataSource = bizDataSource();

        try {
            coreDataSource.init();
            bizDataSource.init();
        } catch (SQLException sql) {
            sql.printStackTrace();
        }

        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        HashMap<Object, Object> hashMap = new HashMap<>();
        hashMap.put(DSEnum.DATA_SOURCE_CORE, coreDataSource);
        hashMap.put(DSEnum.DATA_SOURCE_BIZ, bizDataSource);
        dynamicDataSource.setTargetDataSources(hashMap);
        dynamicDataSource.setDefaultTargetDataSource(coreDataSource);
        return dynamicDataSource;
    }
}

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@TableName(value = "t_user")
public class User extends Model<User> {

private static final long serialVersionUID = 1L;

    /**
     * 主键ID
     */
    @TableId(value="id", type= IdType.AUTO)
    private Integer id;
    /**
     * 账号
     */
    private String username;
    /**
     * 名字
     */
    private String name;
    /**
     * 密码
     */
    private String password;
    /**
     * md5密码盐
     */
    private String salt;
    /**
     * 联系电话
     */
    private String phone;
    /**
     * 备注
     */
    private String tips;
    /**
     * 状态 1:正常 2:禁用
     */
    private Integer state;
    /**
     * 创建时间
     */
    private Date createdTime;
    /**
     * 更新时间
     */
    private Date updatedTime;
    // 省略getter/setter方法
}

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public interface UserMapper extends BaseMapper<User> {

}

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@Service
public class UserService {

    @Resource
    private UserMapper userMapper;

    /**
     * 通过ID查找用户
     * @param id
     * @return
     */
    public User findById(Integer id) {
        return userMapper.selectById(id);
    }

    /**
     * 通过ID查找用户
     * @param id
     * @return
     */
    @DataSource(name = DSEnum.DATA_SOURCE_BIZ)
    public User findById1(Integer id) {
        return userMapper.selectById(id);
    }

    /**
     * 新增用户
     * @param user
     */
    public void insertUser(User user) {
        userMapper.insert(user);
    }

    /**
     * 修改用户
     * @param user
     */
    public void updateUser(User user) {
        userMapper.updateById(user);
    }

    /**
     * 删除用户
     * @param id
     */
    public void deleteUser(Integer id) {
        userMapper.deleteById(id);
    }

}

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@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplicationTests {
    private static final Logger log = LoggerFactory.getLogger(ApplicationTests.class);

    @Resource
    private UserService userService;

    /**
     * 测试增删改查
     */
    @Test
    public void test() {
        // 核心数据库中的用户id=1
        User user = userService.findById(1);
        assertThat(user.getUsername(), is("admin"));

        // biz数据库中的用户id=1
        User user1 = userService.findById1(1);
        assertThat(user1.getUsername(), is("admin1"));
    }
}