无法编译使用Netbeans libpqxx测试
问题描述:
我想编译一个非常简单的程序,使数据库连接并打印数据库名称。我可以在命令行上编译,但在Netbeans中无法这样做。我在Ubuntu 10.04上使用Netbeans IDE 6.9.1,并使用apt-get安装的g ++ 4.4.3和libpqxx 2.6.9。代码如下:无法编译使用Netbeans libpqxx测试
#include <iostream>
#include <pqxx/connection>
using namespace std;
using namespace pqxx;
int main(int argc, char *argv[])
{
try
{
// Set up a connection to the backend
connection C(argv[1]);
cout << C.dbname() << endl;
}
catch (const exception &e)
{
// All exceptions thrown by libpqxx are derived from std::exception
cerr << "Exception: " << e.what() << endl;
return 2;
}
return 0;
}
我能成功编译使用如下:
g++ -g -o example -L/usr/lib/ -lpqxx -lpq dbtest001.cpp
Netbeans的失败,这一点:
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory `/home/dev/work/cpptest'
"/usr/bin/make" -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux-x86/cpptest
make[2]: Entering directory `/home/dev/work/cpptest'
mkdir -p build/Debug/GNU-Linux-x86
rm -f build/Debug/GNU-Linux-x86/main.o.d
g++ -c -g -MMD -MP -MF build/Debug/GNU-Linux-x86/main.o.d -o build/Debug/GNU-Linux-x86/main.o main.cpp
mkdir -p dist/Debug/GNU-Linux-x86
g++ -o dist/Debug/GNU-Linux-x86/cpptest build/Debug/GNU-Linux-x86/main.o
make[2]: Leaving directory `/home/dev/work/cpptest'
make[1]: Leaving directory `/home/dev/work/cpptest'
build/Debug/GNU-Linux-x86/main.o: In function `main':
/home/dev/work/cpptest/main.cpp:13: undefined reference to `pqxx::connection_base::dbname()'
build/Debug/GNU-Linux-x86/main.o: In function `connect_direct':
/usr/include/pqxx/connection.hxx:84: undefined reference to `pqxx::connectionpolicy::connectionpolicy(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/include/pqxx/connection.hxx:84: undefined reference to `vtable for pqxx::connect_direct'
build/Debug/GNU-Linux-x86/main.o: In function `~connect_direct':
/usr/include/pqxx/connection.hxx:82: undefined reference to `vtable for pqxx::connect_direct'
/usr/include/pqxx/connection.hxx:82: undefined reference to `pqxx::connectionpolicy::~connectionpolicy()'
build/Debug/GNU-Linux-x86/main.o: In function `basic_connection':
/usr/include/pqxx/basic_connection.hxx:61: undefined reference to `pqxx::connection_base::connection_base(pqxx::connectionpolicy&)'
/usr/include/pqxx/basic_connection.hxx:62: undefined reference to `pqxx::connection_base::init()'
build/Debug/GNU-Linux-x86/main.o: In function `~basic_connection':
/usr/include/pqxx/basic_connection.hxx:70: undefined reference to `pqxx::connection_base::close()'
collect2: ld returned 1 exit status
make[2]: *** [dist/Debug/GNU-Linux-x86/cpptest] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 622ms)
谁能提供任何洞察到这是为什么失败?我已经离开C++一段时间了,所以我没有像以前那样弄清楚事情出了什么地方。
答
g++ -o dist/Debug/GNU-Linux-x86/cpptest build/Debug/GNU-Linux-x86/main.o
你会注意到Netbeans没有像你那样向链接器命令添加-L和-l选项。这会导致'未定义的引用'错误 - 它不会将您的程序链接到pqxx库。
您需要编辑您的Netbeans项目以设置正确的库路径和依赖项。
呃 - 非常感谢。我知道这会是一件愚蠢的事情。 – thetaiko 2010-12-03 19:17:37