How to create Leave Management System in Visual C++ Programming OOAD

This project on “Leave management system” was developed mainly for checking the leave period &leave balance of a employee. On intent is to create a leave record. We use 3 functions each independent from each other. This function will get the input from the user & the respective leave period &leave balances which are maintained. Database basic insert delete display has been maintained by the basic sql query.
Free Source code in Visual C++ Programming
#include<windows.h>
#include<sqlext.h>
#include<stdio.h>
#include<string.h>
#define TEST_LEN 50
int main()
{
int c;
char ch='y';
SQLINTEGER IDno,Phoneno,Leaveperiod,Leavebal;
SQLCHAR Name[TEST_LEN+1];
HENV hEnv=NULL;
HDBC hDBC=NULL;
HSTMT hStmt=NULL;
UCHAR szSqlStr[]="insert into leave(IDno,Name,Phoneno,Leaveperiod,Leavebal) values(?,?,?,?,?)";
UCHAR szSqlStr1[]="delete * from leave where IDno = ?";
UCHAR szSqlStr2[]="select * from leave";
UCHAR szDSN[SQL_MAX_DSN_LENGTH]="leavemanage";
UCHAR *szUID=NULL;
UCHAR *szPasswd=NULL;
UCHAR szModel1[128];
UCHAR szModel2[128];
UCHAR szModel3[128];
UCHAR szModel4[128];
UCHAR szModel5[128];
SDWORD cbModel1;
SDWORD cbModel2;
SDWORD cbModel3;
SDWORD cbModel4;
SDWORD cbModel5;
SDWORD cbtest=SQL_NTS;
RETCODE retcode;
do
{
printf("=======================================\n LEAVE MANAGEMENT SYSTEM\n=======================================\n");
printf("1.Enter the leave detail \n2.Delete the leave detail\n3.Display the leave detail\n\n");
printf("Enter ur option......\n");
scanf("%d",&c);
switch(c)
{
case 1:
printf("\n-----------------------------------------");
printf("\nEnter the details");
printf("\n-----------------------------------------");
printf("\nEnter the ID No:\t");
scanf("%d",&IDno);
printf("\nEnter the Name:\t");
scanf("%s",&Name);
printf("\nEnter the Phoneno:\t");
scanf("%d",&Phoneno);
printf("\nEnter the Leaveperiod:\t");
scanf("%d",&Leaveperiod);
printf("\nEnter the Leavebal:\t");
scanf("%d",&Leavebal);
printf("\n-----------------------------------------");
SQLAllocEnv(&hEnv);
SQLAllocConnect(hEnv,&hDBC);
retcode=SQLConnect(hDBC,szDSN,SQL_NTS,szUID,SQL_NTS,szPasswd,SQL_NTS);
if(retcode==SQL_SUCCESS||retcode==SQL_SUCCESS_WITH_INFO)
{
retcode=SQLAllocStmt(hDBC,&hStmt);
retcode=SQLPrepare(hStmt,szSqlStr,sizeof(szSqlStr));
SQLBindParameter(hStmt,1,SQL_PARAM_INPUT,SQL_C_LONG,SQL_INTEGER,1,0,&IDno,0,&IDno);
SQLBindParameter(hStmt,2,SQL_PARAM_INPUT,SQL_C_CHAR,SQL_CHAR,TEST_LEN,0,Name,0,&cbtest);
SQLBindParameter(hStmt,3,SQL_PARAM_INPUT,SQL_C_LONG,SQL_INTEGER,1,0,&Phoneno,0,&Phoneno);
SQLBindParameter(hStmt,4,SQL_PARAM_INPUT,SQL_C_LONG,SQL_INTEGER,1,0,&Leaveperiod,0,&Leaveperiod);
SQLBindParameter(hStmt,5,SQL_PARAM_INPUT,SQL_C_LONG,SQL_INTEGER,1,0,&Leavebal,0,&Leavebal);
retcode=SQLExecute(hStmt);
printf("\n\n Detail is inserted.......... \n\n");
}
break;
case 2:
printf("\nDelete the detail\n");
SQLAllocEnv(&hEnv);
SQLAllocConnect(hEnv,&hDBC);
retcode=SQLConnect(hDBC,szDSN,SQL_NTS,szUID,
SQL_NTS,szPasswd,SQL_NTS);
if(retcode==SQL_SUCCESS||retcode==SQL_SUCCESS_WITH_INFO)
{
retcode=SQLAllocStmt(hDBC,&hStmt);
retcode=SQLPrepare(hStmt,szSqlStr1,sizeof(szSqlStr1));
SQLBindParameter(hStmt,1,SQL_PARAM_INPUT,SQL_C_LONG,SQL_INTEGER,1,0,&IDno,0,&IDno);
printf("\nEnter the ID No\n");
scanf("%d",&IDno);
retcode=SQLExecute(hStmt);
printf("detail has been deleted\n\n");
}
break;
case 3:
printf("\nDisplay the detail\n");
SQLAllocEnv(&hEnv);
SQLAllocConnect(hEnv,&hDBC);
retcode=SQLConnect(hDBC,szDSN,SQL_NTS,szUID,SQL_NTS,szPasswd,SQL_NTS);
if(retcode==SQL_SUCCESS||retcode==SQL_SUCCESS_WITH_INFO)
{
retcode=SQLAllocStmt(hDBC,&hStmt);
retcode=SQLPrepare(hStmt,szSqlStr2,sizeof(szSqlStr2));
retcode=SQLExecute(hStmt);
SQLBindCol(hStmt,1,SQL_C_CHAR,szModel1,sizeof(szModel1),&cbModel1);
SQLBindCol(hStmt,2,SQL_C_CHAR,szModel2,sizeof(szModel2),&cbModel2);
SQLBindCol(hStmt,3,SQL_C_CHAR,szModel3,sizeof(szModel3),&cbModel3);
SQLBindCol(hStmt,4,SQL_C_CHAR,szModel4,sizeof(szModel4),&cbModel4);
SQLBindCol(hStmt,5,SQL_C_CHAR,szModel5,sizeof(szModel5),&cbModel5);
retcode=SQLFetch(hStmt);
printf("\n\tID No\tName\tPhoneno\tLeave Period\tLeave Bal\n\n");
while(retcode==SQL_SUCCESS||retcode==SQL_SUCCESS_WITH_INFO)

{
printf("\t%s\t%s\t%s\t%s\t%s\n",szModel1,szModel2,szModel3,szModel4,szModel5);
retcode=SQLFetch(hStmt);
}
}

break;

}
flushall();
printf("\nDo u wan to cont (y/n)");
scanf("%s",&ch);
}
while(ch=='y');
return 0;
}
Leave management System Output Screen shot in Object Oriented Analysis