添加了根据设备编号和时间段查询火情信息的功能模块

src/main/java/com/xkrs/util/Query.java

@@ -0,0 +1,53 @@
+package com.xkrs.util;
+
+import com.xkrs.dao.FireDao;
+import com.xkrs.dao.WeatherDao;
+import com.xkrs.model.entity.Fire;
+import org.springframework.data.jpa.domain.Specification;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.Resource;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Predicate;
+import javax.persistence.criteria.Root;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @Author: XinYi Song
+ * @Date: 2022/2/14 11:29
+ */
+@Component
+public class Query {
+
+    @Resource
+    private FireDao fireDao;
+
+    /**
+     * 根据设备编号和时间段动态查询报警信息
+     * @param startTime
+     * @param endTime
+     * @return
+     */
+    public List<Fire> selectFireBetweenTime(String code, String startTime, String endTime) {
+        Specification<Fire> specification = new Specification<Fire>() {
+            @Override
+            public Predicate toPredicate(Root<Fire> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
+                List<Predicate> list = new ArrayList<>();
+                if (code != null && !"".equals(code)) {
+                    list.add(criteriaBuilder.equal(root.get("deviceCode").as(String.class), code));
+                }
+                if(startTime != null && !"".equals(startTime)){
+                    list.add(criteriaBuilder.greaterThanOrEqualTo(root.get("alarmDate").as(String.class), startTime));
+                }
+                if(endTime != null && !"".equals(endTime)){
+                    list.add(criteriaBuilder.lessThanOrEqualTo(root.get("alarmDate").as(String.class), endTime));
+                }
+                Predicate[] predicates = new Predicate[list.size()];
+                return criteriaBuilder.and(list.toArray(predicates));
+            }
+        };
+        return fireDao.findAll(specification);
+    }
+}