@Update("update employee set status = IF(status = 0, 1, 0) where id = #{id}")转换成lambdaupdate形式

在Spring Data JPA中，使用`@Query`注解配合Lambda表达式可以更简洁地编写动态更新SQL语句。原生的`@Update`注解配合HQL（Hibernate Query Language）表示的是： ```java @update("update employee set status = CASE WHEN status = 0 THEN 1 ELSE 0 END where id = :id") ``` 转换成Lambda Update形式，我们可以这样做： ```java repository.update(employee -> { int newStatus; if (employee.getStatus() == 0) { newStatus = 1; } else { newStatus = 0; } return "update employee set status = :newStatus where id = :id", Map.of("newStatus", newStatus, "id", employee.getId()); }); ``` 这里，我们创建了一个Lambda函数，根据员工当前的状态计算新的状态，并将其作为参数传递给`update`方法。这个方法期望一个自定义的SQL模板和参数映射。

CREATE TRIGGER after_order_complete1 AFTER UPDATE ON Order_dd FOR EACH ROW BEGIN IF NEW.Order_status = '已完成' THEN INSERT INTO Sale (Product_id, Order_id, Order_date, Employee_id, Customer_id, Sale_num, Sale_amount) VALUES (NEW.Product_id, NEW.Order_id, NEW.Order_date, FLOOR(RAND() * (4 - 1 + 1)) + 1, NEW.Customer_id, NEW.Product_num, NEW.Order_price); END IF; -- 在订单表中的产品ID被更新时触发，然后更新销售表中相应的记录的产品ID。这样，无论何时订单表中的产品ID被修改，销售表中的产品ID都会自动更新，以保持一致。 UPDATE `Sale` SET `Product_id` = NEW.`Product_id` WHERE `Order_ID` = NEW.`Order_ID`; END; 以上代码会导致为什么订单表中已完成的产品ID被更新时，销售表中产品ID更新了之后又插入了一条一样的信息。该怎么解决这个问题

根据你提供的代码，当订单状态为“已完成”时，会向销售表中插入一条销售记录，同时会更新销售表中对应的订单的产品ID。但是，你在代码中又加入了一个更新语句，将销售表中的产品ID更新为订单表中的产品ID，这样就导致了重复插入销售记录的问题。为了解决这个问题，可以在更新销售表中的产品ID之前，先判断销售表中是否已经存在相同的销售记录。如果已经存在，则只需要更新销售记录的产品ID即可，否则才需要插入一条新的销售记录。可以使用唯一索引或者唯一约束来实现这个功能，确保销售表中的订单ID和产品ID的组合是唯一的。以下是修改后的代码示例： ``` CREATE TRIGGER after_order_complete1 AFTER UPDATE ON Order_dd FOR EACH ROW BEGIN IF NEW.Order_status = '已完成' THEN -- 判断销售表中是否已经存在相同的销售记录 DECLARE sale_count INT; SELECT COUNT(*) INTO sale_count FROM Sale WHERE Order_id = NEW.Order_id AND Product_id = NEW.Product_id; IF sale_count = 0 THEN -- 插入一条新的销售记录 INSERT INTO Sale (Product_id, Order_id, Order_date, Employee_id, Customer_id, Sale_num, Sale_amount) VALUES (NEW.Product_id, NEW.Order_id, NEW.Order_date, FLOOR(RAND() * (4 - 1 + 1)) + 1, NEW.Customer_id, NEW.Product_num, NEW.Order_price); END IF; -- 更新销售表中对应的订单的产品ID UPDATE Sale SET Product_id = NEW.Product_id WHERE Order_id = NEW.Order_id; END IF; END; ``` 在代码中，我使用了一个变量`sale_count`来保存销售表中订单ID和产品ID组合的数量。如果该数量为0，则表示销售表中不存在对应的销售记录，需要插入一条新的记录。否则，只需要更新对应的产品ID即可。

这是上面的数据库/* Navicat Premium Data Transfer Source Server : Mysql Source Server Type : MySQL Source Server Version : 50729 Source Host : localhost:3306 Source Schema : home_health Target Server Type : MySQL Target Server Version : 50729 File Encoding : 65001 Date: 20/05/2025 12:56:18 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for comment -- ---------------------------- DROP TABLE IF EXISTS `comment`; CREATE TABLE `comment` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(20) NOT NULL, `post_id` bigint(20) NOT NULL, `content` text CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL, `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (`id`) USING BTREE, INDEX `user_id`(`user_id`) USING BTREE, INDEX `post_id`(`post_id`) USING BTREE, CONSTRAINT `comment_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT, CONSTRAINT `comment_ibfk_2` FOREIGN KEY (`post_id`) REFERENCES `post` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of comment -- ---------------------------- -- ---------------------------- -- Table structure for employee -- ---------------------------- DROP TABLE IF EXISTS `employee`; CREATE TABLE `employee` ( `emp_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '员工ID', `emp_name` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '员工姓名', `emp_address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '员工地址', `emp_phone` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '员工电话', `emp_salary` decimal(10, 2) NULL DEFAULT 0.00 COMMENT '员工工资', `score` decimal(3, 1) NULL DEFAULT 0.0 COMMENT '评分', `complaints` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL COMMENT '投诉内容', `emp_type` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '员工类型', `emp_date` date NULL DEFAULT NULL COMMENT '入职时间', PRIMARY KEY (`emp_id`) USING BTREE, INDEX `idx_emp_name`(`emp_name`) USING BTREE, INDEX `idx_emp_type`(`emp_type`) USING BTREE, INDEX `idx_emp_date`(`emp_date`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '员工信息表' ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of employee -- ---------------------------- -- ---------------------------- -- Table structure for family -- ---------------------------- DROP TABLE IF EXISTS `family`; CREATE TABLE `family` ( `fid` int(11) NOT NULL AUTO_INCREMENT, `relationship` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL, `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL, `gender` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL, `age` int(11) NOT NULL, `address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL, `phone` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL, `medical` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL, `avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL, PRIMARY KEY (`fid`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of family -- ---------------------------- INSERT INTO `family` VALUES (1, '父子', '解决', '男', 18, '广西', '18897790686', '无', NULL); -- ---------------------------- -- Table structure for health -- ---------------------------- DROP TABLE IF EXISTS `health`; CREATE TABLE `health` ( `fid` int(11) NOT NULL COMMENT '关联的家庭成员 ID', `height` double NULL DEFAULT NULL COMMENT '身高', `weight` double NULL DEFAULT NULL COMMENT '体重', `BP` double NULL DEFAULT NULL COMMENT '血压', `HR` double NULL DEFAULT NULL COMMENT '心率', `SpO2` double NULL DEFAULT NULL COMMENT '血氧', `step` int(11) NULL DEFAULT NULL COMMENT '步数', PRIMARY KEY (`fid`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '健康数据信息表' ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of health -- ---------------------------- -- ---------------------------- -- Table structure for iot_device -- ---------------------------- DROP TABLE IF EXISTS `iot_device`; CREATE TABLE `iot_device` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `device_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL, `device_type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL, `status` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL, `user_id` bigint(20) NULL DEFAULT NULL, `last_data_time` datetime NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE, INDEX `idx_user_id`(`user_id`) USING BTREE, CONSTRAINT `iot_device_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE SET NULL ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of iot_device -- ---------------------------- -- ---------------------------- -- Table structure for news -- ---------------------------- DROP TABLE IF EXISTS `news`; CREATE TABLE `news` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '新闻ID', `title` varchar(200) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '新闻标题', `content` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '新闻内容', `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', PRIMARY KEY (`id`) USING BTREE, INDEX `idx_created_at`(`created_at`) USING BTREE COMMENT '按创建时间索引' ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '新闻信息表' ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of news -- ---------------------------- -- ---------------------------- -- Table structure for operation_log -- ---------------------------- DROP TABLE IF EXISTS `operation_log`; CREATE TABLE `operation_log` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(20) NOT NULL, `operation` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL, `operation_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP, `ip` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `device` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE, INDEX `idx_user_id`(`user_id`) USING BTREE, CONSTRAINT `operation_log_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of operation_log -- ---------------------------- -- ---------------------------- -- Table structure for order -- ---------------------------- DROP TABLE IF EXISTS `order`; CREATE TABLE `order` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '订单 ID', `user_id` bigint(20) NOT NULL COMMENT '关联的用户 ID', `product_id` bigint(20) NOT NULL COMMENT '关联的商品 ID', `quantity` int(11) NOT NULL COMMENT '商品数量', `total_price` double NOT NULL COMMENT '订单总价', PRIMARY KEY (`id`) USING BTREE, INDEX `user_id`(`user_id`) USING BTREE, INDEX `product_id`(`product_id`) USING BTREE, CONSTRAINT `order_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT, CONSTRAINT `order_ibfk_2` FOREIGN KEY (`product_id`) REFERENCES `product` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '订单信息表' ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of order -- ---------------------------- -- ---------------------------- -- Table structure for post -- ---------------------------- DROP TABLE IF EXISTS `post`; CREATE TABLE `post` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '帖子ID', `user_id` bigint(20) NOT NULL COMMENT '发布用户ID', `rating` decimal(3, 2) NULL DEFAULT 0.00 COMMENT '动态评分', `rating_count` int(11) NULL DEFAULT 0 COMMENT '评分次数', `content` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '帖子内容', `title` varchar(200) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '帖子标题', `section` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '发布板块', `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', PRIMARY KEY (`id`) USING BTREE, INDEX `idx_user_id`(`user_id`) USING BTREE, INDEX `idx_created_at`(`created_at`) USING BTREE, INDEX `idx_section`(`section`) USING BTREE, CONSTRAINT `post_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '帖子信息表' ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of post -- ---------------------------- -- ---------------------------- -- Table structure for product -- ---------------------------- DROP TABLE IF EXISTS `product`; CREATE TABLE `product` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '商品 ID', `name` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '商品名称', `price` double NOT NULL COMMENT '商品价格', `description` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL COMMENT '商品描述', PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '商品信息表' ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of product -- ---------------------------- -- ---------------------------- -- Table structure for tb_posture_record -- ---------------------------- DROP TABLE IF EXISTS `tb_posture_record`; CREATE TABLE `tb_posture_record` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID', `user_id` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '用户ID', `evaluation_result` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '体态评估结果', `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', PRIMARY KEY (`id`) USING BTREE, INDEX `idx_user_id`(`user_id`) USING BTREE COMMENT '用户ID索引' ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '体态评估记录表' ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of tb_posture_record -- ---------------------------- -- ---------------------------- -- Table structure for user -- ---------------------------- DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '用户名(登录账户)', `salt` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '密码盐值', `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '登录密码', `real_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '真实姓名', `phone` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '手机号', `user_type` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '用户类型(normal/vip/enterprise)', `status` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '状态(normal/disabled/pending)', `role` int(11) NULL DEFAULT NULL COMMENT '权限级别', `create_time` datetime NULL DEFAULT NULL COMMENT '创建时间', `last_login_time` datetime NULL DEFAULT NULL COMMENT '最后登录时间', `last_login_ip` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '最后登录IP', `last_login_device` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '最后登录设备', PRIMARY KEY (`id`) USING BTREE, UNIQUE INDEX `uk_username`(`username`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '用户表' ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of user -- ---------------------------- INSERT INTO `user` VALUES (1, 'mmm', '111', '123456', '庞帅', '18897790686', '普通用户', '1', 1, '2025-05-20 12:07:57', '2025-05-22 12:08:05', '广西', '电脑'); SET FOREIGN_KEY_CHECKS = 1;

### 用户管理系统的核心功能实现 #### 数据库表结构设计对于用户管理系统的数据库表结构，通常会涉及以下几个字段来满足基本需求： | 字段名称 | 类型 | 描述 | |----------|--------------|-------------------------| | id | INT (主键) | 唯一标识符 | | username | VARCHAR(50) | 用户名 | | password | VARCHAR(255) | 密码（加密存储） | | email | VARCHAR(100) | 邮箱地址 | | status | TINYINT | 用户状态（如：启用/禁用）| | created_at | DATETIME | 创建时间 | | updated_at | DATETIME | 更新时间 | 此表的设计能够支持用户的增删改查以及状态更新等基础功能。 #### SQL 实现代码以下是针对该表的一些常见操作的 SQL 实现： ##### 添加新用户 ```sql INSERT INTO users (username, password, email, status, created_at, updated_at) VALUES ('newUser', 'hashedPassword', '[email protected]', 1, NOW(), NOW()); ``` ##### 查询用户列表并分页假设每页显示 10 条记录，当前为第一页： ```sql SELECT * FROM users ORDER BY id DESC LIMIT 0, 10; ``` 通过调整 `LIMIT` 的起始位置和数量参数可实现不同页数的数据加载[^4]。 ##### 修改用户信息例如更改用户名为 newUsername 的邮箱地址： ```sql UPDATE users SET email='[email protected]' WHERE username='newUsername'; ``` ##### 删除特定用户依据前文提到的内容，删除指定 ID 的用户记录可以通过以下方式完成： ```sql DELETE FROM users WHERE id=1; ``` #### 后端逻辑处理示例下面是一个基于 Node.js 和 Express 框架的 RESTful API 示例用于执行上述 CRUD 功能之一——删除用户的功能展示。 ```javascript app.delete('/users/:id', async (req, res) => { const userId = req.params.id; try { await db.query('DELETE FROM users WHERE id=?', [userId]); res.status(200).send(`User with ID ${userId} has been deleted.`); } catch (error) { console.error(error); res.status(500).send('Error deleting user.'); } }); ``` #### AJAX 请求调用前端交互例子从前端发起删除请求的例子可以参照如下 JavaScript 片段，它展示了如何构建一个简单的按钮点击事件触发服务器上的资源移除动作。 ```javascript function deleteUser(userId){ $.ajax({ url: `/users/${userId}`, type: 'DELETE', success: function(result){ alert("User Deleted Successfully"); }, error: function(xhr,status,errorThrown){ alert("Failed to delete user."); } }); } ``` 以上内容涵盖了从数据库层面到前后端配合的具体实践方法论介绍。希望这些资料能帮助理解整个流程是如何运作起来服务于最终的产品目标达成之上。

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@Update("update employee set status = IF(status = 0, 1, 0) where id = #{id}")转换成lambdaupdate形式

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