无法连接到mysql中的数据库（mysql c++连接器）[Linux]

Question

我已经从这里下载了c ++ mysql连接器（版本：8.3.0）：mysql连接器c ++

我还在linux中安装了该库：libmysqlcppconn-dev

我安装了xampp。我可以通过localhost访问phpmyadmin，并且可以访问mysql：

sudo mysql -u root -p

我给了 root 用户一个密码并刷新了权限。

我有这个示例代码：

/* 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 <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/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", "the_password");
  /* 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 data 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;
}

但是我有这个错误：

# ERR: Access denied for user 'root'@'localhost' (using password: YES) (MySQL error code: 1045, SQLState: 28000 )

实际上，我真正想要的是与一个名为 admin 的用户连接，但我不能这样做：

sudo mysql -u admin -p

，因为我有错误：

ERROR 1045 (28000): Access denied for user 'admin'@'localhost' (using password: YES)

。但是 admin 拥有所有权限，并且已分配主机 localhost。

另一种连接方式是：

mysqlx::Session session("tcp://127.0.0.1:3306", "root", "the password");
mysqlx::Schema schema = session.getSchema("test");

但是也无法连接。

我该怎么做？

提前致谢

Answer 1

我看到了这个链接：MYSQL用户，如果我输入地址127.0.0.1而不是本地主机，它就会连接