C++连接Mysql数据库，mysql_real_connect总是报错：访问内存冲突

 #include #include #include #include using namespace std;#pragma comment(lib, "ws2_32.lib")#pragma comment(lib, "libmysql.lib")//单步执行，不想单步执行就注释掉#define STEPBYSTEPint main() { cout << "****************************************" << endl;#ifdef STEPBYSTEP system("pause");#endif //必备的一个数据结构 MYSQL mydata; //初始化数据库 if (0 == mysql_library_init(0, NULL, NULL)) { cout << "mysql_library_init() succeed" << endl; } else { cout << "mysql_library_init() failed" << endl; return -1; }#ifdef STEPBYSTEP system("pause");#endif //初始化数据结构 if (NULL != mysql_init(&mydata)) { cout << "mysql_init() succeed" << endl; } else { cout << "mysql_init() failed" << endl; return -1; }#ifdef STEPBYSTEP system("pause");#endif //在连接数据库之前，设置额外的连接选项 //可以设置的选项很多，这里设置字符集，否则无法处理中文 if (0 == mysql_options(&mydata, MYSQL_SET_CHARSET_NAME, "gbk")) { cout << "mysql_options() succeed" << endl; } else { cout << "mysql_options() failed" << endl; return -1; }#ifdef STEPBYSTEP system("pause");#endif //连接数据库 if (NULL != mysql_real_connect(&mydata, "localhost", "root", "test", "test", 3306, NULL, 0)) //这里的地址，用户名，密码，端口可以根据自己本地的情况更改 { cout << "mysql_real_connect() succeed" << endl; } else { cout << "mysql_real_connect() failed" << endl; return -1; }#ifdef STEPBYSTEP system("pause");#endif //sql字符串 string sqlstr; //创建一个表 sqlstr = "CREATE TABLE IF NOT EXISTS user_info"; sqlstr += "("; sqlstr += "user_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'Unique User ID',"; sqlstr += "user_name VARCHAR(100) CHARACTER SET gb2312 COLLATE gb2312_chinese_ci NULL COMMENT 'Name Of User',"; sqlstr += "user_second_sum INT UNSIGNED NOT NULL DEFAULT 0 COMMENT 'The Summation Of Using Time'"; sqlstr += ");"; if (0 == mysql_query(&mydata, sqlstr.c_str())) { cout << "mysql_query() create table succeed" << endl; } else { cout << "mysql_query() create table failed" << endl; mysql_close(&mydata); return -1; }#ifdef STEPBYSTEP system("pause");#endif //向表中插入数据 sqlstr = "INSERT INTO user_info(user_name) VALUES('公司名称'),('一级部门'),('二级部门'),('开发小组'),('姓名');"; if (0 == mysql_query(&mydata, sqlstr.c_str())) { cout << "mysql_query() insert data succeed" << endl; } else { cout << "mysql_query() insert data failed" << endl; mysql_close(&mydata); return -1; }#ifdef STEPBYSTEP system("pause");#endif //显示刚才插入的数据 sqlstr = "SELECT user_id,user_name,user_second_sum FROM user_info"; MYSQL_RES *result = NULL; if (0 == mysql_query(&mydata, sqlstr.c_str())) { cout << "mysql_query() select data succeed" << endl; //一次性取得数据集 result = mysql_store_result(&mydata); //取得并打印行数 int rowcount = mysql_num_rows(result); cout << "row count: " << rowcount << endl; //取得并打印各字段的名称 unsigned int fieldcount = mysql_num_fields(result); MYSQL_FIELD *field = NULL; for (unsigned int i = 0; i < fieldcount; i++) { field = mysql_fetch_field_direct(result, i); cout << field->name << "\t\t"; } cout << endl; //打印各行 MYSQL_ROW row = NULL; row = mysql_fetch_row(result); while (NULL != row) { for (int i = 0; i < fieldcount; i++) { cout << row[i] << "\t\t"; } cout << endl; row = mysql_fetch_row(result); } } else { cout << "mysql_query() select data failed" << endl; mysql_close(&mydata); return -1; }#ifdef STEPBYSTEP system("pause");#endif //删除刚才建的表 sqlstr = "DROP TABLE user_info"; if (0 == mysql_query(&mydata, sqlstr.c_str())) { cout << "mysql_query() drop table succeed" << endl; } else { cout << "mysql_query() drop table failed" << endl; mysql_close(&mydata); return -1; } mysql_free_result(result); mysql_close(&mydata); mysql_server_end(); system("pause"); return 0;}