1. 查询一条数据:(多用于保存时判断db中是否已有当前数据,这里 is 精确匹配,模糊匹配 使用regex...)
public PageUrl getByUrl(String url) {
return findOne(new Query(Criteria.where("url").is(url)),PageUrl.class);
}
2. 查询多条数据:linkUrl.id 属于分级查询
public List getPageUrlsByUrl(int begin, int end,String linkUrlid) {
Query query = new Query();
query.addCriteria(Criteria.where("linkUrl.id").is(linkUrlid));
return find(query.limit(end - begin).skip(begin), PageUrl.class);
}
3.模糊查询:-----关键字---regex
public long getProcessLandLogsCount(List conditions)
{
Query query = new Query();
if (conditions != null && conditions.size() > 0) {
for (Condition condition : conditions) {
query.addCriteria(Criteria.where(condition.getKey()).regex(".*?\\" +condition.getValue().toString()+ ".*"));
}
}
return count(query, ProcessLandLog.class);
}
public List getProcessLandLogs(int begin,int end,List conditions,String orderField,Direction direction)
{
Query query = new Query();
if (conditions != null && conditions.size() > 0) {
for (Condition condition : conditions) {
if(condition.getKey().equals("time")){
query.addCriteria(Criteria.where("time").gte(condition.getValue())); //gte: 大于等于
}else if(condition.getKey().equals("insertTime")){
query.addCriteria(Criteria.where("insertTime").gte(condition.getValue()));
}else{
query.addCriteria(Criteria.where(condition.getKey()).is(condition.getValue()));
}
}
}
return find(query.limit(end - begin).skip(begin).with(new Sort(new Sort.Order(direction, orderField))), ProcessLandLog.class);
}
public List getDpsLandsByTime(int begin, int end, Date beginDate,Date endDate) {
return find(new Query(Criteria.where("updateTime").gte(beginDate).lte(endDate)).limit(end - begin).skip(begin),
DpsLand.class);
}
查询字段不存在的数据 -----关键字---not
public List getGoodsDetails2(int begin, int end) {
Query query = new Query();
query.addCriteria(Criteria.where("goodsSummary").not());
return find(query.limit(end - begin).skip(begin),GoodsDetail.class);
}
查询字段不为空的数据 -----关键字---ne
Criteria.where("key1").ne("").ne(null)
查询或语句：a || b ----- 关键字---orOperator
Criteria criteria = new Criteria();
criteria.orOperator(Criteria.where("key1").is("0"),Criteria.where("key1").is(null));
查询且语句：a && b ----- 关键字---and
Criteria criteria = new Criteria();
criteria.and("key1").is(false);
criteria.and("key2").is(type);
Query query = new Query(criteria);
long totalCount = this.mongoTemplate.count(query, Xxx.class);
查询一个属性的子属性，例如：查下面数据的key2.keyA的语句
var s = {
key1: value1,
key2: {
keyA: valueA,
keyB: valueB
}
};
@Query("{'key2.keyA':?0}")
List findAllBykeyA(String keyA);
5. 查询数量:----- 关键字---count
public long getPageInfosCount(List conditions) {
Query query = new Query();
if (conditions != null && conditions.size() > 0) {
for (Condition condition : conditions) {
query.addCriteria(Criteria.where(condition.getKey()).is(condition.getValue()));
}
}
return count(query, PageInfo.class);
}
查找包含在某个集合范围：----- 关键字---in
Criteria criteria = new Criteria();
Object [] o = new Object[]{0, 1, 2}; //包含所有
criteria.and("type").in(o);
Query query = new Query(criteria);
query.with(new Sort(new Sort.Order(Direction.ASC, "type"))).with(new Sort(new Sort.Order(Direction.ASC, "title")));
List list = this.mongoTemplate.find(query, WidgetMonitor.class);
6. 更新一条数据的一个字段:
public WriteResult updateTime(PageUrl pageUrl) {
String id = pageUrl.getId();
return updateFirst(new Query(Criteria.where("id").is(id)),Update.update("updateTime", pageUrl.getUpdateTime()), PageUrl.class);
}
7. 更新一条数据的多个字段:
//调用更新
private void updateProcessLandLog(ProcessLandLog processLandLog,
int crawlResult) {
List fields = new ArrayList();
List
8. 删除数据:
public void deleteObject(Class clazz,String id) {
remove(new Query(Criteria.where("id").is(id)),clazz);
}
9.保存数据:
//插入一条数据
public void saveObject(Object obj) {
insert(obj);
}
//插入多条数据
public void saveObjects(List objects) {
for(T t:objects){
insert(t);
}
}
