Java 使用条件api查找半径内的坐标
我需要使用CriteriaBuilder从数据库中获取所有行,其中(纬度和经度)与给定纬度和经度(用户位置)之间的距离(例如:10公里) 在第三个if中,我必须获取结果并将其添加到谓词中Java 使用条件api查找半径内的坐标,java,mysql,hibernate,jpa,criteria-api,Java,Mysql,Hibernate,Jpa,Criteria Api,我需要使用CriteriaBuilder从数据库中获取所有行,其中(纬度和经度)与给定纬度和经度(用户位置)之间的距离(例如:10公里) 在第三个if中,我必须获取结果并将其添加到谓词中 CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Issue> cq = cb.createQuery(Issue.class); Root<Issue> issue
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Issue> cq = cb.createQuery(Issue.class);
Root<Issue> issue = cq.from(Issue.class);
List<Predicate> predicates = new ArrayList<>();
if (filters.getCategoryId() != null) {
Category issueCategory = categoryRepository.findById(filters.getCategoryId())
.orElseThrow(() -> new ResourceNotFoundException("Category not found for this id :: " +String.valueOf(filters.getCategoryId())));
predicates.add(cb.equal(issue.get("category"), issueCategory));
}
if (filters.getPostedDays() != null) {
Date startDate = issueUtility.getStartDateForFilterIssues(filters.getPostedDays());
predicates.add(cb.between(issue.get("createdAt"), startDate,new Date()));
}
if (filters.getLatitude() != null && filters.getLongitude() != null) {
// fetch by radius code comes here
}
cq.where(predicates.toArray(new Predicate[0]));```
CriteriaBuilder cb=em.getCriteriaBuilder();
CriteriaQuery cq=cb.createQuery(Issue.class);
根问题=cq.from(问题类);
列表谓词=新的ArrayList();
if(filters.getCategoryId()!=null){
Category issueCategory=categoryRepository.findById(filters.getCategoryId())
.OrelsThrow(()->new ResourceNotFoundException(“未找到此id的类别::”+String.valueOf(filters.getCategoryId())));
add(cb.equal(issue.get(“category”)、issueCategory);
}
if(filters.getPostedDays()!=null){
Date startDate=issueUtility.getStartDateForFilterIssues(filters.getPostedDays());
add(cb.between(issue.get(“createdAt”)、startDate、newdate());
}
if(filters.getLatitude()!=null&&filters.getLatitude()!=null){
//按radius代码取回到这里
}
cq.where(谓词toArray(新谓词[0])```
找到了解决方案
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Issue> cq = cb.createQuery(Issue.class);
Root<Issue> issue = cq.from(Issue.class);
List<Predicate> predicates = new ArrayList<>();
if (filters.getCategoryId() != null) {
Category issueCategory = categoryRepository.findById(filters.getCategoryId())
.orElseThrow(() -> new ResourceNotFoundException("Category not found for this id :: " +String.valueOf(filters.getCategoryId())));
predicates.add(cb.equal(issue.get("category"), issueCategory));
}
if (filters.getPostedDays() != null) {
Date startDate = issueUtility.getStartDateForFilterIssues(filters.getPostedDays());
predicates.add(cb.between(issue.get("createdAt"), startDate,new Date()));
}
if (filters.getLatitude() != null && filters.getLongitude() != null) {
// fetch by radius code comes here
Expression<Issue> point1 = cb.function("point", Issue.class,
issue.get("latitude"),issue.get("longitude"));
Expression<Double> point2 = cb.function("point", Double.class,
cb.literal(filters.getLatitude()),cb.literal(filters.getLongitude()));
Expression<Number> distance = cb.function("ST_Distance_Sphere", Number.class,
point1,point2);
predicates.add(cb.lt(distance,30000));
}
cq.where(predicates.toArray(new Predicate[0]));
return em.createQuery(cq).getResultList();
}
CriteriaBuilder cb=em.getCriteriaBuilder();
CriteriaQuery cq=cb.createQuery(Issue.class);
根问题=cq.from(问题类);
列表谓词=新的ArrayList();
if(filters.getCategoryId()!=null){
Category issueCategory=categoryRepository.findById(filters.getCategoryId())
.OrelsThrow(()->new ResourceNotFoundException(“未找到此id的类别::”+String.valueOf(filters.getCategoryId())));
add(cb.equal(issue.get(“category”)、issueCategory);
}
if(filters.getPostedDays()!=null){
Date startDate=issueUtility.getStartDateForFilterIssues(filters.getPostedDays());
add(cb.between(issue.get(“createdAt”)、startDate、newdate());
}
if(filters.getLatitude()!=null&&filters.getLatitude()!=null){
//按radius代码取回到这里
表达式point1=cb.function(“point”,Issue.class,
issue.get(“纬度”)、issue.get(“经度”);
表达式point2=cb.function(“点”,Double.class,
literal(filters.getLatitude()),cb.literal(filters.getLatitude());
表达式距离=cb.函数(“ST_distance_Sphere”,Number.class,
第1点、第2点);
add(cb.lt(distance,30000));
}
cq.where(谓词toArray(新谓词[0]);
返回em.createQuery(cq.getResultList();
}
Ok。那么问题出在哪里?@mytwoons如何使用标准构建器计算与坐标的距离请看这里@NikolayShevchenko Mysql