Question

我一直在尝试在Windows 7（x64）上使用Visual Studio 2010来运行MySQL示例。我在Linux上没有问题，但是我在Windows上遇到很多错误。这是我的代码（我从某个网站复制过以测试它是否真的无效）

/* Copyright 2008, 2010, Oracle and/or its affiliates. All rights reserved.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

There are special exceptions to the terms and conditions of the GPL
as it is applied to this software. View the full text of the
exception in file EXCEPTIONS-CONNECTOR-C++ in the directory of this
software distribution.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/* Standard C++ includes */
#include <stdlib.h>
#include <iostream>

  /*
 Include directly the different
 headers from cppconn/ and mysql_driver.h + mysql_util.h
  (and mysql_connection.h). This will reduce your build time!
  */
 #include <mysql_connection.h>

 #include <driver.h>
 #include <exception.h>
 #include <resultset.h>
 #include <statement.h>

 using namespace std;

 int main(void)
    {
   cout << endl;
   cout << "Running 'SELECT 'Hello World!' » AS _message'..." << endl;

 try {
 sql::Driver *driver;
 sql::Connection *con;
 sql::Statement *stmt;
 sql::ResultSet *res;

 /* Create a connection */
 driver = get_driver_instance();
 con = driver->connect("tcp://127.0.0.1:3306", "root", "root");
 /* Connect to the MySQL test database */
 con->setSchema("test");

 stmt = con->createStatement();
 res = stmt->executeQuery("SELECT 'Hello World!' AS _message");
 while (res->next()) {
   cout << "\t... MySQL replies: ";
   /* Access column data by alias or column name */
  cout << res->getString("_message") << endl;
cout << "\t... MySQL says it again: ";
/* Access column fata by numeric offset, 1 is the first column */
cout << res->getString(1) << endl;
 }
 delete res;
 delete stmt;
 delete con;

 } catch (sql::SQLException &e) {
 cout << "# ERR: SQLException in " << __FILE__;
 // cout << "(" << __FUNCTION__ << ") on line " » << __LINE__ << endl;
 cout << "# ERR: " << e.what();
 cout << " (MySQL error code: " << e.getErrorCode();
 cout << ", SQLState: " << e.getSQLState() << " )" << endl;
 }

cout << endl;

return EXIT_SUCCESS;
}

hen我尝试链接到静态库mysqlcppconn-static.lib。这会在下面产生未解决的错误。：

1>xedownload.obj : error LNK2019: unresolved external symbol     
"__declspec(dllimport)     public: class std::basic_string<char,struct       
std::char_traits<char>,class std::allocator<char> > const & __thiscall     
sql::SQLException::getSQLState(void)const "(__imp_?getSQLState@SQLException@sql@@QBEABV?$basic_string@DU?$char_traits@D@std@@V?$alloc    ator@D@2@@std@@XZ) referenced in function __catch$_main$0
1>xedownload.obj : error LNK2019: unresolved external symbol "__declspec(dllimport)
 public: int __thiscall sql::SQLException::getErrorCode(void)const "(__imp_?getErrorCode@SQLException@sql@@QBEHXZ) referenced in function __catch$_main$0
1>xedownload.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) 
public: __thiscall sql::SQLString::~SQLString(void)" (__imp_??1SQLString@sql@@QAE@XZ)     referenced in function _main
1>xedownload.obj : error LNK2019: unresolved external symbol "__declspec(dllimport)     public: __thiscall sql::SQLString::SQLString(char const * const)" (__imp_??0SQLString@sql@@QAE@QBD@Z) referenced in function _main
1>xedownload.obj : error LNK2019: unresolved external symbol __imp__get_driver_instance referenced in function _main
1>xedownload.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_string<char,struct std::char_traits<char>,class     std::allocator<char> > const & __thiscall sql::SQLString::asStdString(void)const " (__imp_?asStdString@SQLString@sql@@QBEABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) referenced in function "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class sql::SQLString const &)" (??6std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@ABVSQLString@sql@@@Z)
1>c:\users\avi\documents\visual studio 2010\Projects\xedownload\Debug\xedownload.exe : fatal error LNK1120: 6 unresolved externals

Answer 1

我认为你正在运行win32，但实际上你的库是64位的，所以你需要看到你的系统安装了MySQL Connector C ++ 1.1.6，其中下一个，最后是64位还是32位。运行32位程序需要安装32位库，这需要64位库和头文件才能运行64位程序。 VSxxxx特别关注开发过程

C ++ mySQL连接器LINKER错误（Windows）

1 个答案: