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遵循 MySQL C++ 连接器上的 MySQL 站点的语法，但效果不佳，这里有一个片段：

#include "/usr/include/mysql++/mysql++.h"
#include "/usr/include/mysql/mysql.h"
#include "/usr/include/mysql/mysql_version.h"
#include "/usr/include/mysql_connection.h"
#include "/usr/include/mysql_driver.h"
#include <cppconn/driver.h>
#include <cppconn/connection.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>
#include <cppconn/prepared_statement.h>


using namespace std;
using namespace sql::mysql;
using namespace sql;


sql::mysql::MySQL_Driver *driver;
driver = sql::mysql::get_mysql_driver_instance();
sql::Connection *con;
con = driver->connect("tcp://127.0.0.1:3306", "db", "password");
sql::PreparedStatement  *prep_stmt;
prep_stmt = con->prepareStatement("INSERT INTO db(srcIP, srcCountry, destIP, destHost, destPort, blIP) VALUES (?, ?, ?, ?, ?, ?)");

    prep_stmt->setString(1, src_ip);
    prep_stmt->setString(2, country_code);
    prep_stmt->setString(3, dest_ip);
    prep_stmt->setString(4, host_name);
    prep_stmt->setString(5, dest_prt);
    prep_stmt->setString(6, blip);
    prep_stmt->execute();

    delete prep_stmt;
    delete con;

            }
        else

sql::mysql::MySQL_Driver *driver;
driver = sql::mysql::get_mysql_driver_instance();
sql::Connection *con;
    con = driver->connect("tcp://127.0.0.1:3306", "db", "password");
sql::PreparedStatement *prep_stmt;
    prep_stmt = con->prepareStatement("INSERT INTO db(srcIP, srcCountry, destIP, destHost, destPort, blIP) VALUES (?, ?, ?, ?, ?, ?)");

    prep_stmt->setString(1, src_ip);
    prep_stmt->setString(2, country_code);
    prep_stmt->setString(3, dest_ip);
        prep_stmt->setString(4, he->h_name);
    prep_stmt->setString(5, dest_prt);
    prep_stmt->setString(6, blip);
    prep_stmt->execute();

    delete prep_stmt;
    delete con;

编译：

g++ sql.c -o sql -I/usr/include -I/usr/include/mysql -I/usr/include/mysql++ -I/usr/local/include -I/usr/local/include/cppconn -lmysqlcppconn - lmysql++ -lstdc++ -lmysqlpp -lmysqlclient

并且总是在第二组 MySQL 驱动程序上得到错误：

错误：未在此范围内声明“驱动程序”

4

1 回答 1

1

仅根据我所看到的，您希望成为 else 案例一部分的语句周围似乎缺少大括号。如果你这样做：

if (x)
{
   // do something
}
else
   Foo* foo = new foo();
   foo->someFunction();

您将在读取的行上看到错误，foo->someFunction();因为 else 仅包含一个没有大括号的语句，并且 foo 在那之后超出了范围。你需要这样做：

if (x)
{
   // do something
}
else
{
   Foo* foo = new foo();
   foo->someFunction();
}
于 2012-10-05T19:02:12.940 回答