MySQL和MariaDB库'；s在C++；使用cmake，mingw > StigTig与MySLQ连接器——这里是CMAKISST.TXT文件，我使用它来在Windows上使用CsAuto GUI生成构建系统（因为我实际上必须在Windows中用C++编写控制台应用程序）。< /强> < /P> cmake_minimum_required(VERSION 3.16) # Or whatever version you use set(CMAKE_CXX_STANDARD 17) # THIS HAS TO COME BEFORE THE PROJECT LINE # THIS HAS TO COME BEFORE THE PROJECT LINE project(test VERSION 0.0.0 LANGUAGES C CXX) project(main) set(FULL_PATH_TO_MYSQL_CONNECTOR_CPP_DIR "C:\\connector") include_directories(${FULL_PATH_TO_MYSQL_CONNECTOR_CPP_DIR}\\include) link_directories(${FULL_PATH_TO_MYSQL_CONNECTOR_CPP_DIR}\\lib64\\v14) add_executable(test main.cpp) target_link_libraries(test C:/connector/lib64/vs14/mysqlcppconn.lib) target_compile_features(test PRIVATE cxx_range_for) set(STDFS_LIB stdc++fs)

下面是我试图运行的代码（main.cpp）

#include <stdio.h>  
 #include <stdint.h>
#include <cstdint>
#include <sys/types.h>

#include <jdbc/cppconn/driver.h>
#include <jdbc/cppconn/exception.h>
#include <jdbc/cppconn/resultset.h>
#include <jdbc/cppconn/statement.h>
#include <jdbc/cppconn/prepared_statement.h>
//#include <mysql/mysql.h>


int main()
{
    try
        {
            sql::Driver *driver;
            sql::Connection *con;
            //sql::Statement *stmt;
            sql::ResultSet *res;
            sql::PreparedStatement *pstmt;

            /* Create a connection */
            driver = get_driver_instance();
        
    } catch (sql::SQLException &e)
        {
            ///nav implementēts vairāk info
            //cout << "# ERR: SQLException in " << __FILE__;
            //cout << "(" << __FUNCTION__ << ") on line " << __LINE__ << endl;
            /* what() (derived from std::runtime_error) fetches error message */
            //cout << "# ERR: " << e.what();
            //cout << " (MySQL error code: " << e.getErrorCode();
            //cout << "# ERR: SQLException in " << endl;
        }
    return 0;
}

C:\Users\FL\Desktop\TEST2>make
[ 50%] Building CXX object CMakeFiles/test.dir/main.cpp.obj
In file included from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/resultse
t.h:36:0,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:8:
C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/config.h:101:19: error: confli
cting declaration 'typedef long int int32_t'
 typedef __int32   int32_t;
                   ^~~~~~~
In file included from c:\mingw\lib\gcc\mingw32\6.3.0\include\stdint.h:9:0,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\cstdint:41,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\char_trait
s.h:420,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\string:40,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\stdexcept:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\array:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\tuple:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\stl_map.h:
63,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\map:61,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/connecti
on.h:36,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/driver.h
:36,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:6:
c:\mingw\include\stdint.h:62:15: note: previous declaration as 'typedef int int3
2_t'
 typedef int   int32_t;
               ^~~~~~~
In file included from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/resultse
t.h:36:0,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:8:
C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/config.h:105:26: error: confli
cting declaration 'typedef long unsigned int uint32_t'
 typedef unsigned __int32 uint32_t;
                          ^~~~~~~~
In file included from c:\mingw\lib\gcc\mingw32\6.3.0\include\stdint.h:9:0,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\cstdint:41,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\char_trait
s.h:420,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\string:40,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\stdexcept:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\array:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\tuple:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\stl_map.h:
63,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\map:61,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/connecti
on.h:36,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/driver.h
:36,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:6:
c:\mingw\include\stdint.h:63:19: note: previous declaration as 'typedef unsigned
 int uint32_t'
 typedef unsigned  uint32_t;
                   ^~~~~~~~
In file included from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/statemen
t.h:36:0,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:9:
C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/config.h:101:19: error: confli
cting declaration 'typedef long int int32_t'
 typedef __int32   int32_t;
                   ^~~~~~~
In file included from c:\mingw\lib\gcc\mingw32\6.3.0\include\stdint.h:9:0,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\cstdint:41,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\char_trait
s.h:420,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\string:40,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\stdexcept:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\array:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\tuple:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\stl_map.h:
63,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\map:61,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/connecti
on.h:36,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/driver.h
:36,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:6:
c:\mingw\include\stdint.h:62:15: note: previous declaration as 'typedef int int3
2_t'
 typedef int   int32_t;
               ^~~~~~~
In file included from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/statemen
t.h:36:0,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:9:
C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/config.h:105:26: error: confli
cting declaration 'typedef long unsigned int uint32_t'
 typedef unsigned __int32 uint32_t;
                          ^~~~~~~~
In file included from c:\mingw\lib\gcc\mingw32\6.3.0\include\stdint.h:9:0,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\cstdint:41,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\char_trait
s.h:420,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\string:40,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\stdexcept:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\array:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\tuple:39,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\bits\stl_map.h:
63,
                 from c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\map:61,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/connecti
on.h:36,
                 from C:/PROGRA~1/MySQL/MYSQLC~1.0/include/jdbc/cppconn/driver.h
:36,
                 from C:\Users\FL\Desktop\TEST2\main.cpp:6:
c:\mingw\include\stdint.h:63:19: note: previous declaration as 'typedef unsigned
 int uint32_t'
 typedef unsigned  uint32_t;
                   ^~~~~~~~
make[2]: *** [CMakeFiles/test.dir/main.cpp.obj] Error 1
make[1]: *** [CMakeFiles/test.dir/all] Error 2
make: *** [all] Error 2

这意味着gcc或g++有问题，对吗？或者我应该使用make from mingw安装目录而不是make from其他目录

C:\Users\FL>make --version
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i386-pc-mingw32

更新：进行所有更改后，现在的错误是：

[ 50%] Building CXX object CMakeFiles/test.dir/main.cpp.obj
[100%] Linking CXX executable test.exe
c:/mingw/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32
bin/ld.exe: CMakeFiles\test.dir/objects.a(main.cpp.obj):main.cpp:(.text+0x22):
ndefined reference to `check(std::__cxx11::basic_string<char, std::char_traits<
har>, std::allocator<char> > const&)'
c:/mingw/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32
bin/ld.exe: CMakeFiles\test.dir/objects.a(main.cpp.obj):main.cpp:(.text+0x76):
ndefined reference to `check(std::map<std::__cxx11::basic_string<char, std::cha
_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::ch
r_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<ch
r, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<s
d::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > c
nst, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<ch
r> > > > > const&)'
collect2.exe: error: ld returned 1 exit status
make[2]: *** [CMakeFiles\test.dir\build.make:100: test.exe] Error 1
make[1]: *** [CMakeFiles\Makefile2:82: CMakeFiles/test.dir/all] Error 2
make: *** [Makefile:90: all] Error 2```

我的代码是：

#include <stdio.h>  
#include <stdint.h>
#include <cstdint>
#include <sys/types.h>
#include <iostream>
#include <mariadb/conncpp.hpp>

//#include <mysql/mysql.h>
using std::uint32_t;

// Function to print Contacts
void printContacts(std::shared_ptr<sql::Statement> &stmnt)
{
   try
   {
      // Execute SELECT Statement
      std::unique_ptr<sql::ResultSet> res(
            stmnt->executeQuery("SELECT first_name, last_name, email FROM test.contacts")
         );

      // Loop over Result-set
      while (res->next())
      {
         // Retrieve Values and Print Contacts
         std::cout << "- "
            << res->getString("first_name")
            << " "
            << res->getString("last_name")
            << " <"
            << res->getString("email")
            << ">"
            << std::endl;
      }
   }

   // Catch Exception
   catch (sql::SQLException& e)
   {
      std::cerr << "Error printing contacts: "
         << e.what() << std::endl;
   }
}

// Main Process
int main(int argc, char **argv)
{
   try
   {
      // Instantiate Driver
      sql::Driver* driver = sql::mariadb::get_driver_instance();

      // Configure Connection
      // The URL or TCP connection string format is
      // ``jdbc:mariadb://host:port/database``.
      sql::SQLString url("jdbc:mariadb://192.0.2.1:3306/test");

      // Use a properties map for the user name and password
      sql::Properties properties({
            {"user", "db_user"},
            {"password", "db_user_password"}
         });

      // Establish Connection
      // Use a smart pointer for extra safety
      std::unique_ptr<sql::Connection> conn(driver->connect(url, properties));

      // Create a Statement
      // Use a smart pointer for extra safety
      std::shared_ptr<sql::Statement> stmnt(conn->createStatement());

      printContacts(stmnt);

      // Close Connection
      conn->close();
   }

   // Catch Exceptions
   catch (sql::SQLException &e)
   {
      std::cerr << "Error Connecting to MariaDB Platform: "
         << e.what() << std::endl;

      // Exit (Failed)
      return 1;
   }

   // Exit (Success)
   return 0;
}

---

：>

两个连接器MySQL和MariaDB（它们）都是仅在Windows上与Visual Studio一起编译和使用的。你会发现很多关于StackOverflow的问题。它们的问题是，它们定义了许多已经在标准库中定义的结构，然后链接到标准库

我建议您切换到Visual Studio或Linux系统。如果必须在Windows下使用GCC，请寻找其他连接器。这些问题不容易解决。如果是这样，解决方案不太可能是可移植的，并且可能无法与两个连接器的未来版本一起使用。您可以查看备选方案和

---

第一个问题：固定宽度整数

您提到的第一个问题实际上与头文件中定义的和32位操作系统有关。有传统的整数类型，如

char

、

short

、

int

、

long

和

long

，但还有前面提到的固定宽度整数

MySQL连接器在 CONFIG.H./COD>中定义了 It32→t/s>代码>数据类型，标准C++库定义了：MySQL用编译器数据类型<代码>

typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;

令人惊讶的是，这是

long int

数据类型

typedef long int int32_t;
typedef long unsigned int uint32_t;

标准库将它们定义为常规

int

typedef int int32_t;
typedef unsigned int uint32_t;

long

整型数据类型保证至少是32位的：在32位体系结构上，

long int

是32位的（就像

int

），而对于64位，它们有不同的长度-

long int

是64位的，

int

只有32位（请参阅）。这意味着实际上对于32位系统，这些定义应该相同，但编译器认为它们相互冲突

MySql头由各种定义（我在它们旁边放了一个解释，这样您就可以理解为什么下面给出的建议的解决方案实际有效）包装，这些定义决定是否应该定义相应的数据类型

// Only define for 32-bit compilation
#if defined(_WIN32)
// Don't define if this custom flag is activated
#ifndef CPPCONN_DONT_TYPEDEF_MS_TYPES_TO_C99_TYPES
// Do not define for Visual Studio 2010 and later (but use C++ standard library instead)
#if _MSC_VER >= 1600
#include <stdint.h>
#else
// Only define if HAVE_MS_INT32 (another custom flag) is set to true (1)
#ifdef HAVE_MS_INT32
typedef __int32 int32_t;
#endif
// Some more data type defines...
#endif
#endif
#endif

到

这将为您将来编写的包含此标头的所有程序取消激活相应的定义

---

第二个问题：链接到使用Visual Studio编译的库

您得到的第二条错误消息实际上与链接库有关。在Windows上，使用不同编译器编译的库通常不兼容。这意味着使用GCC编译的程序不能包含使用Visual Studio编译的库在您的情况下，DLL是用Visual Studio编译的，因此链接到GCC程序失败。

cmake_minimum_required(VERSION 3.16) # Or whatever version you use
set(CMAKE_CXX_STANDARD 17)
# THIS HAS TO COME BEFORE THE PROJECT LINE

# THIS HAS TO COME BEFORE THE PROJECT LINE
project(test VERSION 0.0.0 LANGUAGES C CXX)
project(main)
set(FULL_PATH_TO_MYSQL_CONNECTOR_CPP_DIR "C:\\connector")
include_directories(${FULL_PATH_TO_MYSQL_CONNECTOR_CPP_DIR}\\include)

link_directories(${FULL_PATH_TO_MYSQL_CONNECTOR_CPP_DIR}\\lib64\\v14)
add_executable(test main.cpp)
target_link_libraries(test C:/connector/lib64/vs14/mysqlcppconn.lib)

target_compile_features(test PRIVATE cxx_range_for)  
set(STDFS_LIB stdc++fs)

如前所述，您可以通过

CMake-G“MinGW Makefiles”

强制CMake使用MinGW而不是visualstudio，但我已经尝试过了，它既不适用于MariaDB，也不适用于MySQL

在MySQL中使用时，我在MariaDB上遇到了一个与OpenSSL相关的神秘错误

cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -G "MinGW Makefiles" -DCONC_WITH_UNIT_TESTS=Off -DCONC_WITH_MSI=OFF -DWITH_SSL=SCHANNEL .
cmake --build . --config RelWithDebInfo

我必须做一些手动修改，例如修改

/src/CArrayImp.h

，并将第59行从

#ifndef _WIN32
# define ZEROI64 0LL
#else
# define ZEROI64 0I64
#endif

到

as

0I64

仅由Visual Studio定义。此外，必须删除

CArray.cpp

中的模板实例化，但最终还是出现了

系统无法找到指定的路径。

错误消息。同样地，我也无法在Cygwin中编译它

---

<强> SQLC++连接器备选软件<强/> /P> 我没有解决最后一个问题的办法，但你可能想看看其他的办法。您可以从源代码下载并编译它。根据标准，它与MinGW兼容，但仅限于。共享软件也应该如此。据介绍，Windows的试用版功能齐全

试用版只能用于评估目的。评价 版本与注册版本没有限制或功能差异 版本但是，评估版本会显示一条注册消息 每次应用程序执行其第一个数据库连接时 （Windows版本）

注册后，您将：

• 接收库的非试用版本，包括其完整源代码
• 继续获得终身免费电子邮件支持
• 获得一年的免费bug修复和新版本升级

两者都应该支持MySql：例如，请参阅

---

---

tl；dr:仅在Visual Studio中的窗口上使用MySQL和MariaDB连接器。如果您不能使用VisualStudio，请查看<强>可选的C++ SQL连接器，例如“和/强”> .< /P> < P>这是我如何用MysWshell（MyS2 shell）（Mys2 shell）（以下是使用编译器）构建MiRADB客户端库的方法：

wgethttps://downloads.mariadb.org/interstitial/connector-c-3.1.11/mariadb-connector-c-3.1.11-src.tar.gz
tar xfz mariadb-connector-c-3.1.11-src.tar.gz
cd-ADB-connector-c-3.1.11-src
#修复cmake/ConnectorName.cmake（版本>=3.1.11）
补丁-ulbf cmake/ConnectorName.cmake你能删除
#include
和
#include
？好的，但谷歌说：“从GCC 5开始，C++17功能可用。这种模式是
#define HAVE_MS_INT32  1
#define HAVE_MS_UINT32 1

#define HAVE_MS_INT32  0
#define HAVE_MS_UINT32 0

cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -G "MinGW Makefiles" -DCONC_WITH_UNIT_TESTS=Off -DCONC_WITH_MSI=OFF -DWITH_SSL=SCHANNEL .
cmake --build . --config RelWithDebInfo

#ifndef _WIN32
# define ZEROI64 0LL
#else
# define ZEROI64 0I64
#endif

#define ZEROI64 0LL