我已经获得了cpp应用程序所需的两个库。
https://github.com/rbock/sqlpp11
https://github.com/rbock/sqlpp11-connector-mysql
我将它们与libmysqlclient-dev和日期库一起下载。当我在项目cmake ..和make的每个项目中创建构建目录并运行make tests时，所有库测试都有效。
我使用import_library()导入项目根目录中的两个库，并且build dir中没有cmake ..的错误。当我运行make代码时，即使<sqlpp11/sqlpp11.h>运行正常，代码仍无法找到cmake ..的包含。以下是我的根CMakeLists.txt和我的src CMakeLists.txt。
cmake_minimum_required(VERSION 3.5)
project(mysql_sample)
set(HinnantDate_ROOT_DIR "${PROJECT_SOURCE_DIR}/date")
find_library(sqlpp11 REQUIRED)
include_directories(${sqlpp11_INCLUDE_DIRS})
find_library(sqlpp11-connector-mysql REQUIRED)
include_directories(${sqlpp11-connector-mysql_INCLUDE_DIRS})
include_directories(${PROJECT_SOURCE_DIR}/include)
add_subdirectory(include)
add_subdirectory(src)
add_subdirectory(test)
和
add_executable(mysql_sample main.cpp)
target_link_libraries(mysql_sample ${sqlpp11_LIBRARIES})
target_link_libraries(mysql_sample ${sqlpp11-connector-mysql_LIBRARIES})
修改1
回应评论错误
Maker Error at /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
Could NOT find Sqlpp11-connector-mysql (missing:
sqlpp11-connector-mysql_INCLUDE_DIR)
Call Stack (most recent call first):
/usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
CMake/FindSqlpp11-connector-mysql.cmake:7 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:15 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/andrew/cpp_work/sql_sample_project/build/CMakeFiles/CMakeOutput.log".
See also "/home/andrew/cpp_work/sql_sample_project/build/CMakeFiles/CMakeError.log".
使用CMakeLists.txt
cmake_minimum_required(VERSION 3.5)
project(mysql_sample)
set(HinnantDate_ROOT_DIR "${PROJECT_SOURCE_DIR}/date")
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/CMake)
find_package(Sqlpp11 REQUIRED)
include_directories(${sqlpp11_INCLUDE_DIRS})
set(include_dir "${PROJECT_SOURCE_DIR}/include")
file(GLOB_RECURSE sqlpp_headers ${include_dir}/*.h ${SQLPP11_INCLUDE_DIR}/*.h)
include_directories(${include_dir})
find_package(Sqlpp11-connector-mysql REQUIRED)
include_directories(${sqlpp11-connector-mysql_INCLUDE_DIRS})
file(GLOB_RECURSE sqlpp11-connector-mysql_headers ${include_dir}/*.h ${sqlpp11-connector-mysql_INCLUDE_DIR}/*.h)
include_directories(${include_dir})
add_executable(mysql_sample src/main.cpp)
target_link_libraries(mysql_sample ${sqlpp11_LIBRARIES})
target_link_libraries(mysql_sample ${sqlpp11-connector-mysql_LIBRARIES})
include_directories(${PROJECT_SOURCE_DIR}/include)
add_subdirectory(include)
add_subdirectory(src)
add_subdirectory(test)
和FindSqlpp11.cmake
find_path(SQLPP11_INCLUDE_DIR sqlpp11.h
${PROJECT_SOURCE_DIR}/sqlpp11
${PROJECT_SOURCE_DIR}/include/sqlpp11
)
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Sqlpp11 DEFAULT_MSG SQLPP11_INCLUDE_DIR)
mark_as_advanced(SQLPP11_INCLUDE_DIR)
和FindSqlpp11-connector-mysql.cmake
find_path(Sqlpp11-connector-mysql_INCLUDE_DIR sqlpp11-connector-mysql.h
${PROJECT_SOURCE_DIR}/sqlpp11-connector-mysql
${PROJECT_SOURCE_DIR}/include/sqlpp11-connector-mysql
)
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Sqlpp11-connector-mysql DEFAULT_MSG sqlpp11-connector-mysql_INCLUDE_DIR)
mark_as_advanced(Sqlpp11-connector-mysql_INCLUDE_DIR)
为什么这里有错误，我是否在正确的轨道上？
修改2
我成功完成了上述工作，我的问题是我没有正确安装。我现在从此代码中收到以下错误。
main.cpp:(.text+0x124): undefined reference to `sqlpp::mysql::connection::connection(std::shared_ptr<sqlpp::mysql::con
nection_config> const&)'
main.cpp:(.text+0x12e): undefined reference to `sqlpp::mysql::connection::~connection()'
collect2: error: ld returned 1 exit status
CMakeFiles/mysql_sample.dir/build.make:94: recipe for target 'mysql_sample' failed
make[2]: *** [mysql_sample] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/mysql_sample.dir/all' failed
make[1]: *** [CMakeFiles/mysql_sample.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
代码：
include "TabSample.h"
#include <sqlpp11/sqlpp11.h>
#include <sqlpp11/mysql/mysql.h>
namespace mysql = sqlpp::mysql;
int main()
{
auto config = std::make_shared<mysql::connection_config>();
config->user = "root";
config->database = "sqlpp_mysql";
config->debug = true;
mysql::connection db(config);
TabSample tab;
for(const auto& row : db.run(sqlpp::select(all_of(tab)).from(tab).unconditionally()))
{
std::cerr << "row.alpha: " << row.alpha << ", row.beta: " << row.beta << ", row.gamma: " << row.gamma << std::endl;
};
return 0;
}
我正在使用gcc 4.9并且make / make install没有错误，我在CMakeLists.txt中遗漏了什么？
cmake_minimum_required(VERSION 3.5)
project(mysql_sample)
set(HinnantDate_ROOT_DIR "/usr/local/lib/date")
include_directories(/usr/local/lib/date)
if(UNIX)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=gnu++0x")
endif()
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/CMake)
set(SQLPP11_INCLUDE_DIR /usr/local/include)
find_package(Sqlpp11 REQUIRED)
add_executable(mysql_sample src/main.cpp)
target_link_libraries(mysql_sample ${sqlpp11_LIBRARIES})
target_link_libraries(mysql_sample ${sqlpp11-connector-mysql_LIBRARIES})
include_directories(${PROJECT_SOURCE_DIR}/include)
add_subdirectory(include)
add_subdirectory(src)
add_subdirectory(test)
的CMakeLists.txt
cmake_minimum_required(VERSION 3.5)
project(mysql_sample)
set(HinnantDate_ROOT_DIR "/usr/local/lib/date")
include_directories(/usr/local/lib/date)
set(CMAKE_CXX_STANDARD 11)
if(UNIX)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
endif()
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/CMake)
set(SQLPP11_INCLUDE_DIR /usr/local/include)
find_package(Sqlpp11 REQUIRED)
add_executable(mysql_sample src/main.cpp)
include_directories(${sqlpp11_INCLUDE_DIRS})
include_directories(${sqlpp11-connector-mysql_INCLUDE_DIRS})
target_link_libraries(mysql_sample ${sqlpp11_LIBRARIES})
target_link_libraries(mysql_sample ${sqlpp11-connector-mysql_LIBRARIES})
target_link_libraries(mysql_sample mysqlclient)
include_directories(${PROJECT_SOURCE_DIR}/include)
add_subdirectory(include)
add_subdirectory(src)
add_subdirectory(test)
FindSqlpp11连接器-mysql.cmake
## -----------------------------------------------------------------------------
## Check for the library
find_library (sqlpp11-connector-mysql-mysql_LIBRARIES sqlpp11-connector-mysql-mysql
PATHS usr/local/cmake /usr/local/cmake/sqlpp11-connector-mysql-mysql /usr/local/lib /usr/lib /lib /sw/lib /usr/local/include
)
## -----------------------------------------------------------------------------
## Actions taken when all components have been found
if (sqlpp11-connector-mysql-mysql_INCLUDES AND sqlpp11-connector-mysql-mysql_LIBRARIES)
set (HAVE_sqlpp11-connector-mysql-mysql TRUE)
else (sqlpp11-connector-mysql-mysql_INCLUDES AND sqlpp11-connector-mysql-mysql_LIBRARIES)
if (NOT sqlpp11-connector-mysql-mysql_FIND_QUIETLY)
if (NOT sqlpp11-connector-mysql-mysql_INCLUDES)
message (STATUS "Unable to find sqlpp11-connector-mysql-mysql header files!")
endif (NOT sqlpp11-connector-mysql-mysql_INCLUDES)
if (NOT sqlpp11-connector-mysql-mysql_LIBRARIES)
message (STATUS "Unable to find sqlpp11-connector-mysql-mysql library files!")
endif (NOT sqlpp11-connector-mysql-mysql_LIBRARIES)
endif (NOT sqlpp11-connector-mysql-mysql_FIND_QUIETLY)
endif (sqlpp11-connector-mysql-mysql_INCLUDES AND sqlpp11-connector-mysql-mysql_LIBRARIES)
if (HAVE_sqlpp11-connector-mysql-mysql)
if (NOT sqlpp11-connector-mysql-mysql_FIND_QUIETLY)
message (STATUS "Found components for sqlpp11-connector-mysql-mysql")
message (STATUS "sqlpp11-connector-mysql-mysql_INCLUDES = ${sqlpp11-connector-mysql-mysql_INCLUDES}")
message (STATUS "sqlpp11-connector-mysql-mysql_LIBRARIES = ${sqlpp11-connector-mysql-mysql_LIBRARIES}")
endif (NOT sqlpp11-connector-mysql-mysql_FIND_QUIETLY)
else (HAVE_sqlpp11-connector-mysql-mysql)
if (sqlpp11-connector-mysql-mysql_FIND_REQUIRED)
message (FATAL_ERROR "Could not find sqlpp11-connector-mysql-mysql!")
endif (sqlpp11-connector-mysql-mysql_FIND_REQUIRED)
endif (HAVE_sqlpp11-connector-mysql-mysql)
mark_as_advanced (
HAVE_sqlpp11-connector-mysql-mysql
sqlpp11-connector-mysql-mysql_LIBRARIES
sqlpp11-connector-mysql-mysql_INCLUDES
)
和错误输出：
root@beaglebone:~/cpp_work/sql_sample_project/build# cmake ..
-- Attempting to find SQLPP11 FILES
-- Unable to find SQLPP11 library files!
-- Unable to find sqlpp11-connector-mysql-mysql header files!
-- Unable to find sqlpp11-connector-mysql-mysql library files!
-- Configuring done
-- Generating done