C++ 通过C+连接到mySQL+；

我已经使用

sudo apt get安装mySQL服务器

然后，我使用

sudo apt get安装libmysqlclient15 dev

此外，我还安装了libmysqlc++-dev，使用

sudo apt get安装libmysqlc++-dev

在所有这些之后，我尝试使用

g++test.c-I/usr/include/mysql-I/usr/include/mysql++

#include <mysql.h>
#include <stdio.h>
#include <stdlib.h>
#include <mysql++.h>


// just going to input the general details and not the port numbers
struct connection_details
{
    char *server;
    char *user;
    char *password;
    char *database;
};

MYSQL* mysql_connection_setup(struct connection_details mysql_details)
{
     // first of all create a mysql instance and initialize the variables within
    MYSQL *connection = mysql_init(NULL);

    // connect to the database with the details attached.
    if (!mysql_real_connect(connection,mysql_details.server, mysql_details.user, mysql_details.password, mysql_details.database, 0, NULL, 0)) {
      printf("Conection error : %s\n", mysql_error(connection));
      exit(1);
    }
    return connection;
}

MYSQL_RES* mysql_perform_query(MYSQL *connection, char *sql_query)
{
   // send the query to the database
   if (mysql_query(connection, sql_query))
   {
      printf("MySQL query error : %s\n", mysql_error(connection));
      exit(1);
   }

   return mysql_use_result(connection);
}

int main()
{
  MYSQL *conn;      // the connection
  MYSQL_RES *res;   // the results
  MYSQL_ROW row;    // the results row (line by line)

  struct connection_details mysqlD;
  mysqlD.server = "localhost";  // where the mysql database is
  mysqlD.user = "root";     // the root user of mysql   
  mysqlD.password = "123"; // the password of the root user in mysql
  mysqlD.database = "mysql";    // the databse to pick

  // connect to the mysql database
  conn = mysql_connection_setup(mysqlD);

  // assign the results return to the MYSQL_RES pointer
  res = mysql_perform_query(conn, "show tables");

  printf("MySQL Tables in mysql database:\n");
  while ((row = mysql_fetch_row(res)) !=NULL)
      printf("%s\n", row[0]);
   // clean up the database result set 
  mysql_free_result(res);
  // clean up the database link 
  mysql_close(conn);

  return 0;
}

---

我相信我做的每件事都是对的。。你们能指出我错在哪里吗？用这个命令编译

 gcc -o test  -L/usr/lib/mysql -lmysqlclient test.c

---

您还必须实际链接库（

-I

只指定包含目录）

试一试

下面是用于单独编译步骤的示例命令行（首先创建对象文件，然后将它们链接在一起）：

---

您正在包括

mysql++.h

，但没有使用它

我把你的代码改了一点

#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
/* #include <mysql++.h> Do not need this */

它运行

$  ./a.out 
Conection error : Access denied for user 'root'@'localhost' (using password: YES)

---

看来你的错误陈述中有拼写错误。这就证明了这是您的代码。

更好的办法是，将编译和链接阶段分开，但这样应该可以启动操作+1.

g++ -I/usr/include/mysql -I/usr/include/mysql++ -o test.o -c test.c
g++ -L/usr/local/lib -lmysqlpp -lmysqlclient -o test test.o

#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
/* #include <mysql++.h> Do not need this */

gcc mysql-test.c  $(mysql_config --cflags) $(mysql_config --libs) -Wall

$  ./a.out 
Conection error : Access denied for user 'root'@'localhost' (using password: YES)