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xassert.hpp : #include <execinfo.h> #include <cstdlib> #include <iostream> using std::cout; using std::endl; void xassert(bool ok, const char * str) { if(ok) return; int addr_count; void * buffer[100]; char ** strings; int i; addr_count = backtrace(buffer, 100); cout << "ASSERT : " << str << endl; strings = backtrace_symbols(buffer, addr_count); if(strings == NULL) { cout << "Failed to get backtrace symbols\n"; return; } for(i = 0; i < addr_count; i++) cout << strings[i] << endl; free(strings); exit(100); } void xassert(bool ok, std::string stdstr) { const char * str = stdstr.c_str(); if(ok) return; int addr_count; void * buffer[100]; char ** strings; int i; addr_count = backtrace(buffer, 100); cout << "ASSERT : " << str << endl; strings = backtrace_symbols(buffer, addr_count); if(strings == NULL) { cout << "Failed to get backtrace symbols\n"; return; } for(i = 0; i < addr_count; i++) cout << strings[i] << endl; free(strings); exit(100); } mysql.hpp : #ifndef MYSQL_HPP #define MYSQL_HPP #include <iostream> #include <vector> #include <map> #include <mysql/mysql.h> #include <cstdio> #include <cstdlib> #include "xassert.hpp" using std::cout; using std::endl; using std::size_t; typedef std::vector<std::map<std::string, std::string> > mysql_result; struct mysql_connection{ mysql_connection(const char* host, const char* username, const char* password, const char* db_name) { m_Host = host; m_Username = username; m_Password = password; m_DbName = db_name; } void init() { m_Con = mysql_init(NULL); xassert(m_Con, "mysql_init fail"); const int param = 1; xassert(!mysql_options(m_Con, MYSQL_OPT_RECONNECT, (const void*)&param), "Failed to set options"); xassert(mysql_real_connect(m_Con, m_Host, m_Username, m_Password, m_DbName, 0, NULL, 0), "Mysql connection could not be established"); } void exec(const char * query) { xassert(!mysql_query(m_Con, query), std::string(query) + " : " + std::string(mysql_error(m_Con))); } mysql_result select(const char *query) { MYSQL_ROW row; MYSQL_FIELD *field; MYSQL_RES *res; int num_columns; int num_rows; mysql_result rezult; std::vector<std::string> columns; exec(query); // run query res = mysql_store_result(m_Con); // store result if(!res) return rezult; // empty result set num_columns = mysql_num_fields(res); // get number of columns num_rows = mysql_num_rows(res); rezult.resize(num_rows); while(field = mysql_fetch_field(res)) // fetch column names columns.push_back(field->name); int row_count = 0; while((row = mysql_fetch_row(res))) // fetch rows { for(int i = 0; i < num_columns; i++) // iterate columns { std::string column(columns[i]); rezult[row_count][column] = std::string(row[i]); } row_count++; } mysql_free_result(res); return rezult; } ~mysql_connection() { mysql_close(m_Con); } private: MYSQL * m_Con; const char * m_Host; const char * m_Username; const char * m_Password; const char * m_DbName; }; #endif main.cpp : #include "mysql.hpp" int main(int argc, char** argv) { mysql_connection sql("localhost", "root", "pass", "test"); sql.init(); sql.exec("DROP TABLE IF EXISTS test"); sql.exec("CREATE TABLE test ( x INT, y INT )"); sql.exec("INSERT INTO test VALUES ( 1, 2)"); sql.exec("INSERT INTO test VALUES ( 3, 4)"); mysql_result result = sql.select("SELECT * FROM test"); for(size_t row = 0; row < result.size(); row++) { for(auto it = result[row].begin(); it != result[row].end(); it++) cout << it->first << " : " << it->second << endl; cout << "-----------------" << endl; } return 0; } LE: n-ar fi rau un script de syntax highlighting sau un plugin care sa afiseze linkuri de ideone / codepad

Ai dou? variante. 1. print (str(a) + 'asdf') 2. print (a, 'asdf') Unde a este variabila ta de tip întreg, iar 'asdf' e stringul. În primul caz, converte?ti variabila în string ?i concatenezi acest string cu cel?lalt ('asdf'). Rezultatul va fi 2asdf (deci f?r? spa?iu) pentru a = 2. În cel de-al doilea caz, rezultatul va fi afi?at cu spa?iu, adic? 2 asdf.