我是C++新手，正做一个中英文翻译的小程序，但是总是有错误，还请各位高手帮看看，下面有错误提示。
谢谢了！！！

---------------------------------------------------------------------------------------------
1>------ Build started: Project: temp6, Configuration: Release Win32 ------
1>Compiling...
1>temp6.cpp
1>.\temp6.cpp(48) : error C2146: syntax error : missing ')' before identifier 'str1'
1>.\temp6.cpp(48) : error C2059: syntax error : ')'
1>Build log was saved at "file://c:\Documents and Settings\Administrator\桌面\My_Project\temp6\temp6\Release\BuildLog.htm"
1>temp6 - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


#include <stdafx.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <iomanip>
#include <mysql_connection.h>
#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>

        
using namespace std;
        
int main(void)

{
        string (str1);
try
{
  sql::Driver *driver;
  sql::Connection *con;
  sql::Statement *stmt;
  sql::ResultSet *res;


  /* Create a connection */
  driver = get_driver_instance();
  con = driver->connect("localhost", "root", "qwerty");
  /* Connect to the MySQL menagerie database */
  con->setSchema("menagerie");

        stmt = con->createStatement();
        stmt->execute("set names \'GBK\'");
        
        
        cout << "Please enter an english word: ";
        cin >> str1;

        res=stmt->executeQuery("select * from test2 where english="str1"");----------提示错误就是说这句！但是我不知道是怎么错了？
        while (res->next())
{
    cout << res<<endl;

        cout <<setiosflags(ios::left)<<setw(9)<<res->getString(1)<<"     ";//1 is english
        cout <<setiosflags(ios::left)<<setw(9)<<res->getString(2);//2 is chinese
   
  }
  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;
}

以下是我试过的方法：
res=stmt->executeQuery("select * from test2 where english=\'%s\'", str1);
executeQuery("select * from test2 where english="str1"");
res=stmt->executeQuery("select * from test2 where english=\'str1\'");
我也有试过用单引号‘’ 和括号（），但是都不行呀。

Please enter an english word: one//这是我输入的‘one’

# ERR: SQLException in .\temp6.cpp(main) on line 69
# ERR: Unknown column 'one' in 'where clause' (MySQL error code: 1054, SQLState:
 42S22 )

我刚刚试过，运行没有提示错误，但是这是mysql提示的错误。
谢谢版主的回帖。