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我一直在尝试在 Windows 7 (x64) 上使用 Visual Studio 2010 获得工作 MySQL 示例。我在 Linux 上没有问题,但是,我在 Windows 上遇到了很多错误。这是我的代码(我从某个站点复制来测试它是否真的不起作用)

/* 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;
}

然后我尝试链接到静态库 mysqlcppconn-static.lib。这会产生以下未解决的错误。:

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
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1 回答 1

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I think you are running win32, but in fact your library is 64-bit, so you need to see your system installed MySQL Connector C++ 1.1.6 in which the next, in the end is 64-bit or 32-bit. Running a 32-bit program requires the installation of a 32-bit library, which requires 64-bit libraries and header files to run 64-bit programs. VSxxxx special attention to the development process

于 2016-11-07T07:10:01.557 回答