/*
* 用于复杂对象转换 e.g {key1:value1,key2:{key21:value21,key22:value22,...},key3:[value31,value32,...],...}
* @param obj 需要转化的对象
*/
public BasicDBObject converToMGObject(Object obj) {
String jsonStr = JsonUtil.toJson(obj);
BasicDBObject dbObject = (BasicDBObject) JSON.parse(jsonStr);
return dbObject;
}
/**
* 查询记录
*
* <p>//and、or多条件联合条件样例 //age条件(and条件) BasicDBList condList = new BasicDBList(); BasicDBObject
* cond = new BasicDBObject(); cond.put("$gt",0); cond.put("$lte",40); BasicDBObject composeCod =
* new BasicDBObject(); composeCod.put("age", cond); condList.add(composeCod);
*
* <p>//name条件 BasicDBObject nameCond = new BasicDBObject(); nameCond.put("name", "name");
* condList.add(nameCond);
*
* <p>//查询条件组合（or条件） BasicDBObject searchCond = new BasicDBObject(); searchCond.put("$or",
* condList);
*
* @param nameClass
* @param conditionDBObject
* @param collectionName
* @return
*/
public <E> List<E> queryRecord(
Class<E> nameClass, BasicDBObject conditionDBObject, String collectionName) {
List<E> resultList = new ArrayList<E>();
try {
DBCollection collection = getCollection(collectionName);
DBCursor cursor = collection.find(conditionDBObject);
while (cursor.hasNext()) {
E result = JsonUtil.fromJson(cursor.next().toString(), nameClass);
resultList.add(result);
}
} catch (Exception e) {
logger.error(
"BaseMongoDAO.queryRecord查询数据时发生异常，入参collectionName="
+ collectionName
+ "; conditionDBObject="
+ conditionDBObject
+ "; nameClass="
+ nameClass.getName(),
e);
}
return resultList;
}
/**
* 查找数据sex1={name1};sex1={name2};sex1={name3};sex2={name1};sex2={name2};sex2={name3};sex3={name1};sex3={name2};sex3={name3};
* String map = "function(){emit(this.sex,this.name);}";
* 处理成sex1={name1,name2,name3};sex2={name1,name2,name3};sex3={name1,name2,name3}; String
* reduce="function(key,values){ var ret={sex:key,names:values}; return ret;}";
*
* @param collectionName
* @param mapFunction
* @param reduceFunction
* @param targetCollection
* @param keyNameOfReduceValue
*/
public void mapReduce(
String collectionName,
String mapFunction,
String reduceFunction,
String targetCollection,
String keyNameOfReduceValue) {
try {
DBCollection collection = getCollection(collectionName);
// 执行mapReduce命令
MapReduceOutput result =
collection.mapReduce(
mapFunction, reduceFunction, targetCollection, OutputType.INLINE, null);
logger.info(
"BaseMongoDAO.mapReduce返回的原始数据值， result=" + result.getCommandResult().toString());
// 获取mapreduce的结果
String reduceResult = result.getCommandResult().get("results").toString();
logger.info("BaseMongoDAO.mapReduce返回的有效数据值， reduceResult=" + reduceResult);
// 返回结果key=要处理的属性；value=聚合后的结果
Map<String, String> mapReduceResult = new HashMap<String, String>();
// 将返回结果用json序列化格式为[{ "_id" : null , "value" : { "sex" : null , "names" : [ "test3" , "test3"
// , "test3"]}} , { "_id" : "man" , "value" : { "sex" :
// "man" , "names" : [ "name" , "test6" , "test6" , "test3" , "test3" , "test3" , "test3" ,
// "test3" , "test3" , "test3" , "test3" , "test3" ,
// "test3" , "test3" , "test3"]}}]
List<Map<String, Object>> reduceMap = JsonUtil.fromJson(reduceResult, List.class);
// 序列化后的串[{_id=null, value={sex=null, num=3.0}}, {_id=man, value={sex=man, num=15.0}},
// {_id=woman, value={sex=woman, num=5.0}}, {_id=women,
// value={name=test2, num=1.0}}]
System.out.println(reduceMap);
logger.info("BaseMongoDAO.mapReduce方法json反序列化后的值， jsonToClassReduceMap=" + reduceMap);
// 遍历mapReduce的结果
for (Map<String, Object> mapInfo : reduceMap) {
// 定义reduce出的key对应的collection中的值
String keyValue = "null";
for (Entry<String, Object> mapInfoEntry : mapInfo.entrySet()) {
// System.out.println("111map key=====" +mapInfoEntry.getKey());
// 获取key对应的collection中的值
if (mapInfoEntry.getKey().equals("_id")) {
keyValue = processNull(mapInfoEntry.getValue());
}
/**
* 这个判断主要是为了集中处理value={sex=man, num=15.0}这类键值
* 绕开对key=NULL(即value为NULL)这类键值对的处理；例如{_id=null, value={sex=null,
* num=3.0}}中的_id和sex;如果为空则不做任何处理 因为下面使用的是MAP的强转，不适宜基础类型
*/
// 如果reduce的值不为空，而且不是基础类型则继续解析map
if (mapInfoEntry.getValue() != null
&& !isPrimitiveType(mapInfoEntry.getValue().getClass().getName())) {
// System.out.println("in in 111map value=====" +mapInfoEntry.getValue());
LinkedHashMap<Object, Object> realInfoMapList =
(LinkedHashMap<Object, Object>) mapInfoEntry.getValue();
for (Entry e : realInfoMapList.entrySet()) {
if (keyNameOfReduceValue.equals(e.getKey().toString())) {
mapReduceResult.put(keyValue, e.getValue().toString());
}
// System.out.println(e.getKey());
// System.out.println(e.getValue());
}
// 值不为NULL的基础类型的处理逻辑
} else if (mapInfoEntry.getValue() != null) {
if (keyNameOfReduceValue.equals(mapInfoEntry.getKey().toString())) {
mapReduceResult.put(keyValue, mapInfoEntry.getValue().toString());
}
// 值为NULL的处理，只打印日志
} else {
logger.error("BaseMongoDAO.mapReduce方法，查到的结果为NULL，不做任何处理" + mapInfoEntry.getValue());
}
}
}
// 输出reduce处理完成后的结果集
for (Entry<String, String> mapInfo : mapReduceResult.entrySet()) {
logger.info(
"BaseMongoDAO.mapReduce方法聚合后的结果key="
+ mapInfo.getKey()
+ "======"
+ mapInfo.getValue());
}
} catch (Exception e) {
logger.error(
"BaseMongoDAO.mapReduce聚合数据时发生异常，入参collectionName="
+ collectionName
+ "; mapFunction="
+ mapFunction
+ "; reduceFunction="
+ reduceFunction
+ "; targetCollection="
+ targetCollection
+ "; keyNameOfReduceValue="
+ keyNameOfReduceValue,
e);
}
}
