There are several ways to connect to the database:

• SQL SERVER
• ODBC
• OLE DB
• MYSQL

I. MySQL

How to connect mysql database is introduced here. MySQL workbench version 6.3 is used. Other versions are also available. Installation process is Baidu

1. Table definition

Development platform

The vs2008 version is used here. It is recommended to use the 2010 version. You can also use Visual C + + to import according to the situation.

Interface:

Code

A CDatabase class is defined to encapsulate database operations.

See the source code for mysql.h and other database files.

#include "StdAfx.h"
#include "MFCDlg.h"
#include <cstring> 
#include <string> 
#include "CDatabase.h"

// Constructor initializes MYSQL object
CDatabase::CDatabase()
{
	mysql_init(&mysql);
}

// Destructor
CDatabase::~CDatabase()
{
	Close();
	mysql_library_end();
}

// Close database connection
void CDatabase::Close()
{
	if(query)	mysql_free_result(query);
	mysql_close(&mysql);
}

// Open database
bool CDatabase::Open(char* host, char* user, char* pass, char* db)
{
	CString  error;
	if(!mysql_real_connect(&mysql, host, user, pass, db, 3306, NULL, 0))
	{ 		
		error = mysql_error(&mysql);
		AfxMessageBox(error);
		//printf("failed to perform query operation. Error reason:% s \ n ", MySQL" & error ";		
		return false;
	}
	return true;
}

//Selection record
bool CDatabase::Execute(char* sql)
{
	if(mysql_real_query(&mysql, sql, strlen(sql)))	return false;
	query = mysql_use_result(&mysql);
	return true;
}
//Set encoding
void CDatabase::SetCode()
{
	//mysql_set_character_set(&mysql, "utf8");
	AfxMessageBox("Success");
}
//Get the number of fields
int CDatabase::GetFieldNum()
{
	if (query) return mysql_num_fields(query);
	return 0;
}

//Get record lines
MYSQL_ROW CDatabase::GetRecord()
{
	if (query) 
	{
		row = mysql_fetch_row(query);
		return row;
	}
	return NULL;
}

// Get Recordset
void CDatabase::GetRecords()
{
	query = mysql_use_result(&mysql);
}

// Get the length of the recordset field value
unsigned long * CDatabase::GetRecordFieldLength()
{
	if (query) return mysql_fetch_lengths(query);
	return NULL;
}
// Show query result set
bool CDatabase::ShowRecords(char* sql)
{
	// Perform query operation
	if (!Execute(sql)) return FALSE;


	unsigned int nFields = GetFieldNum();

	CEdit* pWnd = (CEdit*)AfxGetApp()->m_pMainWnd->GetDlgItem(IDC_EDIT1);
	while ((row = GetRecord()))
	{
		unsigned long *lengths;
		lengths = GetRecordFieldLength();
		for(UINT i = 0; i < nFields; i++)
		{
			//printf("[%.*s] ", (int) lengths[i], row[i] ? row[i] : "NULL");
			char *s = new char[200];
			sprintf(s,"%.*s ", (int) lengths[i], row[i] ? row[i] : "NULL");
			
			//CMFCDlg myDialog = new CMFCDlg();
			//((CEdit*)myDialog.GetDlgItem(IDC_EDIT1))->SetWindowText(_T("xxxx"));
			//myDialog->SetWindowText("123")
			int nLength=pWnd->SendMessage(WM_GETTEXTLENGTH);  
			pWnd->SetSel(nLength,  nLength);  
			pWnd->ReplaceSel(s);
			/*m.setedit(s);*/
		}
		//printf("\n");
	}

	//printf("--------------------------------------------------\n");
	return TRUE;
}

Source link

https://download.csdn.net/download/u011752195/10686142