MySQL中提取出来的日志

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[iyunv@linux tmp]# cat logger.h #ifndef LOGGER_UTIL_INCLUDED #define LOGGER_UTIL_INCLUDED /*    Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.    This program is free software; you can redistribute it and/or modify    it under the terms of the GNU General Public License as published by    the Free Software Foundation; version 2 of the License.    This program is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    GNU General Public License for more details.    You should have received a copy of the GNU General Public License    along with this program; if not, write to the Free Software    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */ /**   A trivial placeholder for inserting Time signatures into streams. @example cout << Datetime() << "[Info] Today was a sunny day" << endl; */ #include <ostream> #include <string> #include <sstream> using namespace std; struct Datetime {}; ostream &operator<<(ostream &os, const Datetime &dt); class Gen_spaces { public:   Gen_spaces(int s)   {     m_spaces.assign(s,' ');   }   ostream &operator<<(ostream &os)   {     return os;   }   friend ostream &operator<<(ostream &os, const Gen_spaces &gen); private:   string m_spaces; }; ostream &operator<<(ostream &os, const Gen_spaces &gen); class Log : public ostream { public:   Log(ostream &str, string logclass) :    ostream(NULL), m_buffer(str, logclass)   {     this->init(&m_buffer);   }   void enabled(bool s) { m_buffer.enabled(s); } private:   class Log_buff : public stringbuf   {   public:     Log_buff(ostream &str, string &logc)       :m_os(str),m_logc(logc), m_enabled(true)     {}     void set_log_class(string &s) { m_logc= s; }     void enabled(bool s) { m_enabled= s; }     virtual int sync();   private:     ostream &m_os;     string m_logc;     bool m_enabled;   };   Log_buff m_buffer; }; #endif /* LOGGER_UTIL_INCLUDED */ [iyunv@linux tmp]# cat logger.cc /*    Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.    This program is free software; you can redistribute it and/or modify    it under the terms of the GNU General Public License as published by    the Free Software Foundation; version 2 of the License.    This program is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    GNU General Public License for more details.    You should have received a copy of the GNU General Public License    along with this program; if not, write to the Free Software    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */ #include "logger.h" #include <iostream> #include <locale> ostream &operator<<(ostream &os, const Datetime &dt) {     const char format[]= "%Y-%m-%d %X";     time_t t(time(NULL));     tm tm(*localtime(&t));     std::locale loc(cout.getloc());     ostringstream sout;     const std::time_put<char> &tput =         std::use_facet<std::time_put<char> >(loc);     tput.put(sout.rdbuf(), sout, '\0', &tm, &format[0], &format[11]);     os << sout.str() << " ";     return os; } ostream &operator<<(ostream &os, const Gen_spaces &gen) {     return os << gen.m_spaces; } int Log::Log_buff::sync() {     string sout(str());     if (m_enabled && sout.length() > 0)     {         m_os << Datetime() << "[" << m_logc << "]"<< Gen_spaces(8-m_logc.length()) << sout;     }     str("");     m_os.flush();     return 0; } [iyunv@linux tmp]# cat main.cpp #include <iostream> #include "logger.h" using namespace std; int main(void) {     cout << Datetime() << "[测试] 今天的天气不错!" << endl;     return 0; } [iyunv@linux tmp]# g++ main.cpp  logger.cc && ./a.out 2016-11-03 17:44:09 [测试] 今天的天气不错! [iyunv@linux tmp]#