mongodb C++调用查询DEMO

mongodb C++调用简单DEMO

简单粗暴，直接扔代码！！

main.cpp

/** file : main.cpp* directory : example for mongodb using in c++* author : HotVC* Official statement:* http://docs.mongodb.org/ecosystem/drivers/cpp-to-sql-to-mongo-shell/*/#include<iostream> #include"mongo/client/dbclient.h"  #include <stdlib.h>#include <stdio.h>#include <boost/foreach.hpp>using namespace std;using namespace mongo;#define CONNECT_STRING "mongodb://localhost:27017"#define DATA_COLLECTION "testdb"#define DATA_TABLE "student"ConnectionString g_csConn;string g_strErr;//boost::scoped_ptr<DBClientBase> g_spConnBase;DBClientBase *g_spConnBase;//int main() {//call the client initialize function to use the BSON library.mongo::client::GlobalInstance instance;if (!instance.initialized()) {std::cout << "failed to initialize the client driver: " << instance.status() << std::endl;return EXIT_FAILURE;}g_csConn = ConnectionString::parse(CONNECT_STRING, g_strErr);if (!g_csConn.isValid()){cout << "Error parsing connection string " << CONNECT_STRING << ": " << g_strErr << endl;return EXIT_FAILURE;}cout << "g_csConn is right" <<endl;g_spConnBase = g_csConn.connect(g_strErr);//  foreach dataBaselist<string> lDataBase = g_spConnBase->getDatabaseNames();BOOST_FOREACH(string strIterator, lDataBase){cout << "DataBase Name is : "<< strIterator <<endl;}//  foreach collectionslist<string> lCollections = g_spConnBase->getCollectionNames(DATA_COLLECTION);BOOST_FOREACH(string strIterator, lCollections){cout << "collections Name is : "<< strIterator <<endl;}cout << "================================================"<< endl;cout << "* insert into testdb.student"<< endl;cout << "* mongodb expression : db.student.insert({\"name\":\"jk1\", \"age\":20, \"sex\":\"gril\"} )" << endl;try{g_spConnBase->insert("testdb.student", BSON("name" << "jk1" << "age" << 19 << "sex" << "gril"));g_spConnBase->insert("testdb.student", BSON("name" << "jk2" << "age" << 20 << "sex" << "boy"));g_spConnBase->insert("testdb.student", BSON("name" << "jk3" << "age" << 21 << "sex" << "gril"));g_spConnBase->insert("testdb.student", BSON("name" << "jk4" << "age" << 22 << "sex" << "boy"));g_spConnBase->insert("testdb.student", BSON("name" << "jk5" << "age" << 23 << "sex" << "boy"));g_spConnBase->insert("testdb.student", BSON("name" << "jk6" << "age" << 24 << "sex" << "gril"));}catch( ... ){cout <<"no insert "<<endl;}cout << "================================================"<< endl;cout << "* update testdb.student"<< endl;cout << "* mongodb expression : db.student.update({\"name\":\"jk1\"}, {\"$set\":{\"sex\":\"boy\"}})" << endl;try{g_spConnBase->update("testdb.student", BSON("name" << "jk1"), BSON("$set"<< BSON("sex" << "boy")));}catch( ... ){cout <<"no update "<<endl;}//count of testdb.student objectcout << "count:" << g_spConnBase->count("testdb.student") << endl;    //先输出对象数量//foreach data in the collections testdb.student collectionscout << "================================================"<< endl;cout << "* Find All"<< endl;cout << "* mongodb expression : db.student.find()"<< endl;auto_ptr<DBClientCursor> cursorAll = g_spConnBase->query("testdb.student", BSONObj());while (cursorAll->more())cout << cursorAll->next().toString() << endl;//query the data where age = 20cout << "================================================"<< endl;cout << "* Find age = 20"<< endl;cout << "* mongodb expression : db.student.find({\"age\":20})"<< endl;auto_ptr<DBClientCursor> cursorAge = g_spConnBase->query("testdb.student", BSON("age" << 20));while (cursorAge->more())cout << cursorAge->next().toString() << endl;cout << "================================================"<< endl;// cout << "* Find name  = json "<< endl;// cout << "* mongodb expression : db.student.find({"age":20})"<< endl;// auto_ptr<DBClientCursor> cursorName = g_spConnBase->query("testdb.student", BSON("name" << "json*"));// while (cursorName->more())// cout << cursorName->next().toString() << endl;cout << "================================================"<< endl;cout << "* Find 20 <= age  <= 22 "<< endl;cout << "* mongodb expression : db.student.find({\"age\":{\"$gte\":20, \"$lte\":22}})"<< endl;auto_ptr<DBClientCursor> cursorAgeRange = g_spConnBase->query("testdb.student", BSON("age" << BSON("$gte" << 20 << "$lte" << 22)));while (cursorAgeRange->more())cout << cursorAgeRange->next().toString() << endl;cout << "================================================"<< endl;cout << "* Find 20 <= age  <= 22 "<< endl;cout << "* mongodb expression : db.student.find({\"age\":{\"$gte\":20, \"$lte\":22}}, {\"name\":1, \"age\":1})"<< endl;BSONObj bsoTmp = BSON("name" << 1 << "age" << 1);auto_ptr<DBClientCursor> cursorAgeRangeLs = g_spConnBase->query("testdb.student", BSON("age" << BSON("$gte" << 20 << "$lte" << 22)) , 0, 0, &bsoTmp);while (cursorAgeRangeLs->more()) cout << cursorAgeRangeLs->next().toString() << endl;cout << "================================================"<< endl;cout << "* DBClientCursor to jk1 string"<< endl;auto_ptr<DBClientCursor> cursorToJson = g_spConnBase->query("testdb.student", BSON("name" << "jk1"));while (cursorToJson->more()){cout << cursorToJson->next().jsonString() << endl;}// cout << "================================================"<< endl;// cout << "* Find 20 <= age  <= 22 "<< endl;// auto_ptr<DBClientCursor> cursorAge_ = g_spConnBase->query("testdb.student", BSON("age" << BSON("$gte" << 20 << "$lte" << 22)), BSON("name"<<1<<"age"<<1));// while (cursorAgeRange->more())// cout << cursorAgeRange->next().toString() << endl;cout << "================================================"<< endl;cout << "* End "<< endl;system ("read");return 0;}

makefile:

mongoDemo : main.o g++ -o mongoDemo main.o -L/usr/local/lib -lpthread -lpcap -lboost_thread -lboost_filesystem -lboost_program_options \ -lboost_regex -lmongoclient main : main.cpp g++ -c main.cppclean:       rm -rf *.o common/*.o mongoDemo