将Visual c ++ 2008连接到MySql [英] Connecting Visual c++ 2008 to MySql
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问题描述
我正在尝试将c ++连接到mysql. 我正在使用Visual c ++ 2008 Express Edition.
I am trying to connect c++ to mysql. I am using visual c++ 2008 Express Edition.
///编写一个c ++程序以将用户添加到mysql/ //应该允许用户仅从给定数据库中选择"条目
//Write a c++ Program to add a user to mysql/ //The User Should be permitted to only "select" entries from the given database
#include<stdio.h>
#include<conio.h>
#include<windows.h>
#include<iostream>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>
using namespace std;
//SQL_ACTIVE_CONNECTIONS
//sql::Connection *_con;
//sql::mysql::MySQL_Driver *_driver;
//_driver = sql::mysql::get_mysql_driver_instance();
//_con = _driver->connect("tcp://127.0.0.1:3306", "user", "password");
MYSQL *conn;
MYSQL *newconn;
char USERNAME[100]; //MYSQL username
char PASSWORD[100]; //MYSQL password
void CreateConnection(void); //Create Connection with mysql server.
void SelectDatabase(void); //Create and select database.
void CreateUser(void); //Create New user and grant Permission.
void NewConn(void); //Create new connection with user information
void CreateTable(void); //Create "Product" Table to operate.
void InsertData(void); //insert data into product table.
void DeleteData(void); //Delete data from product table.
void SelectData(void); //Retrieve data From product table;
int main()
{
char ch;
int select;
char uname[100],pass[100];
CreateConnection();
SelectDatabase();
cout<<"\n\nEnter your login infomation\nTo delete and retrieve use ADMIN account\n";
cout<<"If you are new user your account will be create with insert privilege.\n";
cout<<"UserName :";
gets(uname);
mysql_escape_string(USERNAME,uname,strlen(uname)); //Assign username in USERNAME variable.
cout<<"Password :";
gets(pass);
mysql_escape_string(PASSWORD,pass,strlen(pass)); //Assign password in PASSWORD variable
CreateUser();
NewConn();
cout<<"\nSelect option.";
do
{
cout<<"\n1. INSERT\n2. DELETE\n3. RETRIEVE\n";
cin>>select;
switch(select)
{
case 1:
InsertData();
break;
case 2:
DeleteData();
break;
case 3:
SelectData();
break;
default:
printf("Wrong selection \n");
break;
}
cout<<"Do You want to continue.....(Y/N)\n";
}while(('Y'==getchar())||('y'==getchar()));
mysql_close(newconn);
return 0;
}
//Create connection with mysql server with username and password NULL.
void CreateConnection()
{
conn = mysql_init(NULL);
if (conn == NULL)
{
cout<<"Error : %s\n"<<mysql_error(conn);
exit(1);
}
if(mysql_real_connect(conn, "localhost", NULL,NULL, NULL, 0, NULL, 0) == NULL)
{
cout<<"Error : %s\n", mysql_error(conn);
exit(1);
}
}
//select the database, if it is not present then create .
void SelectDatabase()
{
if(mysql_query(conn, "create database user")) //Query for creat3 database USER
{
if(mysql_errno(conn)==1007) //Error number 1007 means database already Exist
{
if(mysql_select_db(conn,"user")) //Query for Selecte database USER
{
cout<<"Error :",mysql_error(conn);
exit(1);
}
}
else
{
cout<<"Error :",mysql_error(conn);
exit(1);
}
}
else //This else part will be executed only if database is create without error
{
if(mysql_select_db(conn,"user")) //Query for Selecte database USER
{
cout<<"Error :",mysql_error(conn);
exit(1);
}
CreateTable(); //creating tables in USER database
}
}
//Create account for new user and grant permission
void CreateUser()
{
char cmd[200];
sprintf(cmd,"create user '%s'@'localhost' identified by '%s'",USERNAME,PASSWORD); //prepare query to create user with USERNAME and PASSWORD.
if(mysql_query(conn,cmd))
{
if(mysql_errno(conn)==1396) //Error number 1396 means that user already exists
{
cout<<"WELCOME %s\n"<<USERNAME;
}
else
{
cout<<mysql_error(conn);
exit(1);
}
}
else
{
sprintf(cmd,"grant insert on user.* to '%s'@'localhost'",USERNAME); //grant permission for created user.
if(mysql_query(conn,cmd))
{
cout<<mysql_error(conn);
exit(1);
}
else
{
cout<<"Your Account created %S\n"<<USERNAME;
}
}
mysql_close(conn);
}
//create sample table PRODUCT with two coloumn 1.P_ID and 2.P_Name
void CreateTable()
{
if(mysql_query(conn,"CREATE TABLE product (P_Id INT(6) NOT NULL AUTO_INCREMENT,P_NAME VARCHAR(100) NOT NULL,PRIMARY KEY (P_Id));"))
{
cout<<"Error :%s"<<mysql_error(conn);
exit(1);
}
else
{
cout<<"Table created\n";
}
}
//create connection with USERNAME and PASSWORD supplied by user.
void NewConn()
{
newconn = mysql_init(NULL);
if (newconn == NULL) {
cout<<"Error : %s\n"<< mysql_error(newconn);
exit(1);
}
if (mysql_real_connect(newconn, "localhost", USERNAME,PASSWORD,"user", 0, NULL, 0) == NULL) {
cout<<"Error : %s\n"<< mysql_error(newconn);
exit(1);
}
}
//insert data into Product table.
void InsertData()
{
char cmd[200];
char pname[100],PNAME[100];
cout<<"Enter Product Name :"; //product name that would be added in PRODUCT details
cin>>pname;
mysql_escape_string(PNAME,pname,strlen(pname));
cout<<cmd<<"insert into Product (P_NAME) values('%s')"<<pname);
if(mysql_query(newconn,cmd))
{
cout<<"Error :%s"<<mysql_error(newconn);
exit(1);
}
else
{
cout<<"product added\n";
}
}
//Delete data from product table, it require ADMIN privilege.
void DeleteData()
{
char cmd[200];
char pname[100],PNAME[100];
cout<<"Enter Product Name :"; //Enter product name to delete the details
cout<<pname;
mysql_escape_string(PNAME,pname,strlen(pname));
sprintf(cmd,"delete from Product where P_Name='%s'",pname);//prepare delete query.
if(mysql_query(newconn,cmd))
{
cout<<"Error :%s",mysql_error(newconn);
}
else
{
cout<<"product deleted\n";
}
}
//Retrieve data from Product table, it require ADMIN privilege.
void SelectData()
{
char cmd[200];
char pname[100],PNAME[100];
MYSQL_RES *result;
MYSQL_ROW row;
int num_fields,i;
cout<<"Enter Product Name :"; //Enter product name to see the details
cin>>pname;
mysql_escape_string(PNAME,pname,strlen(pname));
cout<<cmd<<"Select * from Product where P_Name='%s'"<<pname); //prepare select statement
if(mysql_query(newconn,cmd))
{
cout<<"Error :%s"<<mysql_error(newconn);
}
else
{
result = mysql_store_result(conn);
num_fields = mysql_num_fields(result);
cout<<"\nPRODUCT ID\tPRODUCT NAME\n";
cout<<"----------------------------------\n";
while ((row = mysql_fetch_row(result)))
{
for(i = 0; i < num_fields; i++)
{
printf("%s\t\t ", row[i] ? row[i] : "NULL"); //display product information
}
printf("\n");
}
mysql_free_result(result);
}
}
但是编译器无法与MySql Project链接.
But the Compiler Is not able to link With MySql Project.
我认为我需要通过库链接Project-> properties. 我已经从[http://dev.mysql.com/downloads/mirror.php?id=369369]网站安装了mysql-connector-c ++-1.0.5-win32.
I think I need to Link throgh Project->properties something Libraries. I had installed mysql-connector-c++-1.0.5-win32 from [http://dev.mysql.com/downloads/mirror.php?id=369369] website.
仍然无法检测到我的文件. 请帮助我.
Still it is not able to detect my files. Please help me.
推荐答案
请阅读链接并正确添加参考.建议您至少阅读一次文档，因为您想使用它.
Please read the link and add the references properly. I suggest you read the documentation atleast once since you want to use it.
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