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我对连接器/C++ 有疑问。我正在使用 CLion 作为 IDE，并希望创建一个 C++ 程序来与 mysql 数据库交互。这是我的 CMakeList.txt 文件，其中包含 c++/connector 静态和动态库：

cmake_minimum_required(VERSION 3.15)
project(cpp_programming)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(MYSQL_CPPCONN_DIR "C:/Program Files/MySQL/MySQL Connector C++ 8.0")

include_directories(${PROJECT_NAME} PUBLIC ${MYSQL_CPPCONN_DIR}/include)
add_executable(${PROJECT_NAME} main.cpp)

# Static Libraries
target_link_libraries(${PROJECT_NAME} ${MYSQL_CPPCONN_DIR}/lib64/vs14/libcrypto.lib)
target_link_libraries(${PROJECT_NAME} ${MYSQL_CPPCONN_DIR}/lib64/vs14/libssl.lib)
target_link_libraries(${PROJECT_NAME} ${MYSQL_CPPCONN_DIR}/lib64/vs14/mysqlcppconn.lib)
target_link_libraries(${PROJECT_NAME} ${MYSQL_CPPCONN_DIR}/lib64/vs14/mysqlcppconn8.lib)
target_link_libraries(${PROJECT_NAME} ${MYSQL_CPPCONN_DIR}/lib64/vs14/mysqlcppconn8-static.lib)
target_link_libraries(${PROJECT_NAME} ${MYSQL_CPPCONN_DIR}/lib64/vs14/mysqlcppconn-static.lib)

# Dynamic Link Libraries
target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/libcrypto-1_1-x64.dll)
target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/libssl-1_1-x64.dll)
target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/mysqlcppconn-7-vs14.dll)
target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/mysqlcppconn8-2-vs14.dll)

我只是在我的 c++ 源文件中包含 xdevapi.h 标头，如下所示：

#include <iostream>
#include <mysqlx/xdevapi.h>

using namespace std;

int main()
{
    return 0;
}

我在 clion 中以 Release 模式运行文件，我收到以下错误：

我在 clion 控制台中看到的错误消息

====================[ Build | cpp_programming | Release ]=======================
"C:\Program Files\JetBrains\CLion 2019.3.2\bin\cmake\win\bin\cmake.exe" --build C:\Users\Kianoush\CLionProjects\cpp_programming\cmake-build-release --target cpp_programming -- -j 2
Scanning dependencies of target cpp_programming
[ 50%] Building CXX object CMakeFiles/cpp_programming.dir/main.cpp.obj
[100%] Linking CXX executable cpp_programming.exe
CMakeFiles\cpp_programming.dir/objects.a(main.cpp.obj):main.cpp:(.text$_ZNK6mysqlx4abi22r05Value5printERSo[_ZNK6mysqlx4abi22r05Value5printERSo]+0x21): undefined reference to `mysqlx::abi2::r0::DbDoc::print(std::ostream&) const'
CMakeFiles\cpp_programming.dir/objects.a(main.cpp.obj):main.cpp:(.text$_ZNK6mysqlx4abi22r05Value5printERSo[_ZNK6mysqlx4abi22r05Value5printERSo]+0x2c): undefined reference to `mysqlx::abi2::r0::common::Value::print(std::ostream&) const'
CMakeFiles\cpp_programming.dir/objects.a(main.cpp.obj):main.cpp:(.text$_ZNK6mysqlx4abi22r08internal14Warning_detail5printERSo[_ZNK6mysqlx4abi22r08internal14Warning_detail5printERSo]+0x87): undefined reference to `mysqlx::abi2::r0::string::Impl::to_utf8[abi:cxx11](mysqlx::abi2::r0::string const&)'
CMakeFiles\cpp_programming.dir/objects.a(main.cpp.obj):main.cpp:(.rdata$_ZTCN6mysqlx4abi22r05ValueE0_NS1_6common5ValueE[_ZTCN6mysqlx4abi22r05ValueE0_NS1_6common5ValueE]+0x20): undefined reference to `mysqlx::abi2::r0::common::Value::print(std::ostream&) const'
CMakeFiles\cpp_programming.dir/objects.a(main.cpp.obj):main.cpp:(.rdata$.refptr._ZTVN6mysqlx4abi22r05DbDocE[.refptr._ZTVN6mysqlx4abi22r05DbDocE]+0x0): undefined reference to `vtable for mysqlx::abi2::r0::DbDoc'
collect2.exe: error: ld returned 1 exit status
CMakeFiles\cpp_programming.dir\build.make:97: recipe for target 'cpp_programming.exe' failed
CMakeFiles\Makefile2:74: recipe for target 'CMakeFiles/cpp_programming.dir/all' failed
CMakeFiles\Makefile2:81: recipe for target 'CMakeFiles/cpp_programming.dir/rule' failed
mingw32-make.exe[3]: *** [cpp_programming.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles/cpp_programming.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles/cpp_programming.dir/rule] Error 2
mingw32-make.exe: *** [cpp_programming] Error 2
Makefile:117: recipe for target 'cpp_programming' failed

我在链接 dll 文件或静态文件时会出错吗？

你建议什么解决方案？

请帮助我，这让我困扰了很多天。

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4

1 回答 1

1

这里有几个问题。

  1. 您不需要链接所有这些不同的库。您实际上只需要mysqlcppconn链接一个库。要找到该库，请尝试使用find_library()，并将其用于链接。您的 CMake 文件应减少到如下内容：
cmake_minimum_required(VERSION 3.15)
project(cpp_programming)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(MYSQL_CPPCONN_DIR "C:/Program Files/MySQL/MySQL Connector C++ 8.0")

include_directories(${PROJECT_NAME} PUBLIC ${MYSQL_CPPCONN_DIR}/include)
add_executable(${PROJECT_NAME} main.cpp)

# Find the mysqlcppconn library.
find_library(mysqlcppconn_LIB 
    mysqlcppconn8 
    HINTS ${MYSQL_CPPCONN_DIR}/lib/vs14

# Static Libraries
target_link_libraries(${PROJECT_NAME} PUBLIC ${mysqlcppconn_LIB})

我不确定您是否正在使用sslandcrypto库，因此如果需要，请重新添加它们。

  1. 您的库 (VisualC++) 与您使用的编译器 (MinGW) 不匹配。据我所知，MySQL 连接器 C++下载不提供 MinGW 库集；它们仅提供使用 Visual Studio 编译器构建的库。因此，您需要切换到使用 VisualC++ 编译器来使用这些库。另一种选择是下载 MySQL 源代码并尝试使用 MinGW 构建它，但这可能更困难。

希望这可以帮助！

于 2020-01-16T18:02:33.740 回答