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src/main/java/com/example/mini_program/service/AppointmentService.java

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+package com.example.mini_program.service;
+
+import com.example.mini_program.entity.VisitApplication;
+import com.example.mini_program.mapper.VisitApplicationMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+@Service
+public class AppointmentService {
+
+    private static final Logger logger = LoggerFactory.getLogger(AppointmentService.class);
+
+    private final VisitApplicationMapper visitApplicationMapper;
+
+    public AppointmentService(VisitApplicationMapper visitApplicationMapper) {
+        this.visitApplicationMapper = visitApplicationMapper;
+    }
+
+    /**
+     * 根据openid获取最新的一条预约记录
+     *
+     * @param openid 微信用户openid
+     * @return 最新的一条预约记录，没有则返回null
+     */
+    public VisitApplication getLatest(String openid) {
+        logger.info("查询用户最新预约记录, openid: {}", openid);
+        VisitApplication result = visitApplicationMapper.selectLatestByOpenid(openid);
+        if (result != null) {
+            logger.info("找到预约记录, id: {}", result.getId());
+        } else {
+            logger.info("未找到预约记录");
+        }
+        return result;
+    }
+}