服务拆分注意事项
单一职责:不同微服务,不要重复开发相同业务
数据独立:不要访问其它微服务的数据库
面向服务:将服务暴露为接口,供其它微服务调用
简单项目
需求:查询订单信息时将用户信息也查询
微服务分析:
- 需要两个服务UserService(操作用户信息)、OrderService(操作订单信息)
- OrderService远程调用UserService提供查询用户信息的方法
搭建工程
1、数据库Sql语句
cloud-user数据库中user表
SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for tb_user -- ---------------------------- DROP TABLE IF EXISTS `tb_user`; CREATE TABLE `tb_user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `username` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '收件人', `address` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '地址', PRIMARY KEY (`id`) USING BTREE, UNIQUE INDEX `username`(`username`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 109 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact; -- ---------------------------- -- Records of tb_user -- ---------------------------- INSERT INTO `tb_user` VALUES (1, '柳岩', '湖南省衡阳市'); INSERT INTO `tb_user` VALUES (2, '文二狗', '陕西省西安市'); INSERT INTO `tb_user` VALUES (3, '华沉鱼', '湖北省十堰市'); INSERT INTO `tb_user` VALUES (4, '张必沉', '天津市'); INSERT INTO `tb_user` VALUES (5, '郑爽爽', '辽宁省沈阳市大东区'); INSERT INTO `tb_user` VALUES (6, '范兵兵', '山东省青岛市'); SET FOREIGN_KEY_CHECKS = 1;View Code
cloud-order数据库中order表
SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for tb_order -- ---------------------------- DROP TABLE IF EXISTS `tb_order`; CREATE TABLE `tb_order` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '订单id', `user_id` bigint(20) NOT NULL COMMENT '用户id', `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '商品名称', `price` bigint(20) NOT NULL COMMENT '商品价格', `num` int(10) NULL DEFAULT 0 COMMENT '商品数量', PRIMARY KEY (`id`) USING BTREE, UNIQUE INDEX `username`(`name`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 109 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact; -- ---------------------------- -- Records of tb_order -- ---------------------------- INSERT INTO `tb_order` VALUES (101, 1, 'Apple 苹果 iPhone 12 ', 699900, 1); INSERT INTO `tb_order` VALUES (102, 2, '雅迪 yadea 新国标电动车', 209900, 1); INSERT INTO `tb_order` VALUES (103, 3, '骆驼(CAMEL)休闲运动鞋女', 43900, 1); INSERT INTO `tb_order` VALUES (104, 4, '小米10 双模5G 骁龙865', 359900, 1); INSERT INTO `tb_order` VALUES (105, 5, 'OPPO Reno3 Pro 双模5G 视频双防抖', 299900, 1); INSERT INTO `tb_order` VALUES (106, 6, '美的(Midea) 新能效 冷静星II ', 544900, 1); INSERT INTO `tb_order` VALUES (107, 2, '西昊/SIHOO 人体工学电脑椅子', 79900, 1); INSERT INTO `tb_order` VALUES (108, 3, '梵班(FAMDBANN)休闲男鞋', 31900, 1); SET FOREIGN_KEY_CHECKS = 1;View Code
2、创建maven项目,父工程
3、创建子模块user-service、order-service
4、父工程pom配置
使用SpringBoot,需要添加父级:SpringBoot:2.3.9.RELEASE
依赖管理
- SpringCloud:Hoxton.SR10(注意版本)
- MySql、Mybatis
<packaging>pom</packaging> <!--父级节点--> <parent> <artifactId>spring-boot-starter-parent</artifactId> <groupId>org.springframework.boot</groupId> <version>2.3.9.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Hoxton.SR10</spring-cloud.version> <mysql.version>5.1.47</mysql.version> <mybatis.version>2.1.1</mybatis.version> </properties> <dependencyManagement> <dependencies> <!-- springCloud --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!-- mysql驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!--mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>${mybatis.version}</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies>View Code