为什么简单的mysql ++代码编译独立，但不是在项目中？ [英] Why simple mysql++ code compiles standalone, but not in project?

问题描述

首先，小程序：

  #include< mysql ++。h> 
 using namespace mysqlpp; 
 
 void mainuu（）
 {Connection conn（mysql，localhost，root，pwd）;} 
  / pre> 
 
 
如果我在CodeLite中将其编译为一个文件，或以这种方式：
 code> g ++ -I / usr / include / mysql -I / usr / include / mysql ++ -lmysqlclient -lmysqlpp -o测试mysql_api.cpp 
  
确定
，但是当我尝试用这个文件构建整个项目时，我得到：
  g ++ -o ./Debug/server ./Debug/main.o ./Debug/log.o ./Debug/packet.o ./Debug/mysql_api.o -L。 
 ./Debug/mysql_api.o：在函数`mainuu（）'：
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:10：未定义引用`mysqlpp： ：Connection :: Connection（char const *，char const *，char const *，char const *，unsigned int）'
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:12：未定义的引用`mysqlpp :: Connection :: query（char const *）'
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:13：未定义引用`mysqlpp :: SQLTypeAdapter： ：SQLTypeAdapter（char const *，bool）'
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:13：未定义引用`mysqlpp :: operator<<（mysqlpp :: quote_type1 ，mysqlpp :: SQLTypeAdapter const&）'
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:19：未定义引用`mysqlpp :: operator<<（std :: basic_ostream< char，std :: char_traits< char>&）; mysqlpp :: String const&）'
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:10：undefined reference to` mysqlpp :: Connection ::〜Connection（）'
 /home/asyler/.codelite/workspace/test/server/mysql_api.cpp:10：未定义引用`mysqlpp :: Connection ::〜Connection（）' 
 ./Debug/mysql_api.o：在函数`mysqlpp :: Row :: operator []（int）const'中：
 /usr/include/mysql++/row.h:328：undefined `mysqlpp :: Row :: at（unsigned int）const'
 ./Debug/mysql_api.o：在函数`mysqlpp :: Query :: store（）'：
 / usr / include / mysql ++ /query.h:467：未定义引用`mysqlpp :: Query :: str（mysqlpp :: SQLQueryParms&）'
 /usr/include/mysql++/query.h:467：未定义引用`mysqlpp :: SQLTypeAdapter :: SQLTypeAdapter（std :: basic_string< char，std :: char_traits< char>，std :: allocator< char> > const& bool）'
 /usr/include/mysql++/query.h:467：未定义的引用`mysqlpp :: Query :: store（mysqlpp :: SQLTypeAdapter const&）'
 collect2：ld返回1退出状态
 make [1]：*** [Debug / server]错误1 
 make [1]：离开目录`/home/asyler/.codelite/workspace/test/server'
 make：*** [全部]错误2 
  
这里是CodeLite g ++编译器设置： / p> 
 
 
  -g -I / usr / include / mysql -I / usr / include / mysql ++ -lmysqlclient -lmysqlpp -L / usr / lib / mysql -L / usr / lib / mysql ++ -lmysql ++ 
  
 
 
解决方案
看起来你需要编辑CodeLite项目设置，并添加在命令行中传递的这些设置 -lmysqlclient -lmysqlpp 。在链接器上填写 库路径和库字段标签。
 
At first, small program:
#include <mysql++.h>
using namespace mysqlpp;

void mainuu ()
{ Connection conn("mysql", "localhost", "root", "pwd");}
If I compile it as one file in CodeLite or in such way:
g++ -I/usr/include/mysql -I/usr/include/mysql++ -lmysqlclient -lmysqlpp -o Test mysql_api.cpp
it's ok
but, when I try to build whole project with this file I get this:
g++ -o ./Debug/server ./Debug/main.o ./Debug/log.o ./Debug/packet.o ./Debug/mysql_api.o  -L.   
./Debug/mysql_api.o: In function `mainuu()':
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:10: undefined reference to `mysqlpp::Connection::Connection(char const*, char const*, char const*, char const*, unsigned int)'
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:12: undefined reference to `mysqlpp::Connection::query(char const*)'
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:13: undefined reference to `mysqlpp::SQLTypeAdapter::SQLTypeAdapter(char const*, bool)'
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:13: undefined reference to `mysqlpp::operator<<(mysqlpp::quote_type1, mysqlpp::SQLTypeAdapter const&)'
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:19: undefined reference to `mysqlpp::operator<<(std::basic_ostream<char, std::char_traits<char> >&, mysqlpp::String const&)'
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:10: undefined reference to `mysqlpp::Connection::~Connection()'
/home/asyler/.codelite/workspace/test/server/mysql_api.cpp:10: undefined reference to `mysqlpp::Connection::~Connection()'
./Debug/mysql_api.o: In function `mysqlpp::Row::operator[](int) const':
/usr/include/mysql++/row.h:328: undefined reference to `mysqlpp::Row::at(unsigned int) const'
./Debug/mysql_api.o: In function `mysqlpp::Query::store()':
/usr/include/mysql++/query.h:467: undefined reference to `mysqlpp::Query::str(mysqlpp::SQLQueryParms&)'
/usr/include/mysql++/query.h:467: undefined reference to `mysqlpp::SQLTypeAdapter::SQLTypeAdapter(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool)'
/usr/include/mysql++/query.h:467: undefined reference to `mysqlpp::Query::store(mysqlpp::SQLTypeAdapter const&)'
collect2: ld returned 1 exit status
make[1]: *** [Debug/server] Error 1
make[1]: Leaving directory `/home/asyler/.codelite/workspace/test/server'
make: *** [All] Error 2
Here is CodeLite g++ compiler settings:
-g -I/usr/include/mysql -I/usr/include/mysql++ -lmysqlclient -lmysqlpp -L/usr/lib/mysql -L/usr/lib/mysql++ -lmysql++

解决方案
Looks like you need to edit CodeLite project settings and add these settings -lmysqlclient -lmysqlpp that you pass in command line. Fill Library Path and Libraries fields on Linker tab.

                        
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