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저는 현재 C#을 사용하여 직원 데이터베이스에서 작업하고 있습니다. 나는 나의 데이터베이스를 구성하는 4 가지 클래스를 가지고있다; 샐러리맨, 시간 종업원, 커미션 종업원 및 기본 봉급 사원. 나는 각 종업원 유형의 이름, 성 및 SSN을 보유하는 "employee"라는 기본 클래스를 가지고 있습니다.데이터베이스 (C#)의 배열에서 데이터를 삭제하는 방법은 무엇입니까?
현재 코드를 실행할 때 각 직원을 개별적으로 인쇄 할 수 있습니다. 필자는 어떤 유형의 직원이 파일에 있는지 테스트하는 테스트 입력 파일을 사용합니다. 해당 직원 유형의 출력 파일로 출력합니다.
이제 사원 기록을 만들 수 있으며 배열에서 직원 기록을 삭제할 수 있기를 원합니다.
나는이에 대한이 방법은 내가이 방법을 시작하기에 문제가 있어요
private void DeleteEmployeeRecord()
{
Console.WriteLine("***** DeleteEmployeeRecord");
}
라고합니다. 배열에서 직원을 어떻게 삭제할 수 있는지에 대한 조언이나 아이디어가 있습니까?
다음은 직원 레코드 만들기, 직원 레코드 찾기, 직원 레코드 삭제 등과 같이 시스템의 모든 작업을 수행하는 직원 데이터베이스 코드입니다. 앞에서 설명한 것처럼 Create 메서드 만 작동하고 나머지는 반환하지 않습니다. 임시 배열에서 직원을 삭제하는 방법을 이해하는 데 도움이되는 모든 도움을 기쁘게 생각합니다.
**EmployeeDB:**
using System;
using System.IO;
namespace PayrollDB
{
internal class EmployeeDB
{
public const string SALARIED = "SALARIED";
public const string BASEPLUS = "BASEPLUS";
public const string COMMISSION = "COMMISSION";
public const string HOURLY = "HOURLY";
public const char CREATE_C = 'C';
public const char CREATE_c = 'c';
public const char SALARIED_S = 'S';
public const char SALARIED_s = 's';
public const char BASEPLUS_B = 'B';
public const char BASEPLUS_b = 'b';
public const char COMMISSION_M = 'M';
public const char COMMISSION_m = 'm';
public const char HOURLY_H = 'H';
public const char HOURLY_h = 'h';
// storage for all the students during the database operations
private Employee[] employees;
public EmployeeDB()
{
}
internal void ReadDataFromInputFile()
{
// create and intialize the file objects
FileStream fstream = new FileStream("INPUT.txt", FileMode.Open, FileAccess.Read);
StreamReader infile = new StreamReader(fstream); // FileStream
int numberOfRecords = int.Parse(infile.ReadLine());
employees = new Employee[numberOfRecords];
for (int i = 0; i < employees.Length; i++)
{
string employeeType = infile.ReadLine();
// read in data for an employee
string firstName = infile.ReadLine();
string lastName = infile.ReadLine();
string socialSecurityNumber = infile.ReadLine();
// how many more things are there to read?
if(employeeType == SALARIED)
{
decimal weeklySalary = decimal.Parse(infile.ReadLine());
// make a employee using the data you just read
// put the employee into the array
employees[i] = new Salaried(firstName, lastName, socialSecurityNumber, weeklySalary);
}
else if(employeeType == BASEPLUS)
{
decimal grossSales = decimal.Parse(infile.ReadLine());
decimal commissionRate = decimal.Parse(infile.ReadLine());
decimal baseSalary = decimal.Parse(infile.ReadLine());
// make an employee using the data you just read
// put the employee into the array
employees[i] = new BasePlus(firstName, lastName, socialSecurityNumber, grossSales, commissionRate, baseSalary);
}
else if (employeeType == COMMISSION)
{
decimal grossSales = decimal.Parse(infile.ReadLine());
decimal commissionRate = decimal.Parse(infile.ReadLine());
// make a student using the data you just read
// put the student into the array
employees[i] = new Commission(firstName, lastName, socialSecurityNumber, grossSales, commissionRate);
}
else if (employeeType == HOURLY)
{
decimal hourlyWage = decimal.Parse(infile.ReadLine());
decimal hoursWorked = decimal.Parse(infile.ReadLine());
// make a student using the data you just read
// put the student into the array
employees[i] = new Hourly(firstName, lastName, socialSecurityNumber, hourlyWage, hoursWorked);
}
else
{
Console.WriteLine("ERROR: That is not a valid employee type.");
}
}
// close the file or release the resource
infile.Close();
}
internal void WriteDataToOutputFile()
{
// create and open an output file
FileStream fstream = new FileStream("OUTPUT.txt", FileMode.Create, FileAccess.Write);
StreamWriter outfile = new StreamWriter(fstream);
// write the size of the array
outfile.WriteLine(employees.Length);
// write the data from the objects in the array to the output file
foreach (var employee in employees)
{
if (employee is Hourly)
{
var hourly = (Hourly)employee;
outfile.Write(hourly.ToDataFileString());
}
else if (employee is Salaried)
{
var salaried = (Salaried)employee;
outfile.Write(salaried.ToDataFileString());
}
else if (employee is Commission)
{
var commission = (Commission)employee;
outfile.Write(commission.ToDataFileString());
}
else if (employee is BasePlus)
{
var baseplus = (BasePlus)employee;
outfile.Write(baseplus.ToDataFileString());
}
}
// close the output file
outfile.Close();
}
public void PrintAllRecords()
{
Console.WriteLine("** Contents of db ***************");
foreach (var emp in employees)
{
Console.WriteLine(emp);
}
}
// main method that operates the application once we get
// all the data read into it
internal void OperateDatabase()
{
// explain the program to the user
DisplayProgramExplanation();
ConsoleKeyInfo choice;
do
{
// user interface
PresentUserInterface();
//string choice = Console.ReadLine();
//selection = choice[0];
choice = Console.ReadKey();
switch(choice.KeyChar)
{
case CREATE_C:
case CREATE_c:
CreateEmployeeRecord();
break;
case 'F':
case 'f':
FindAndPrintEmployeeRecord();
break;
case 'U':
case 'u':
UpdateEmployeeRecord();
break;
case 'D':
case 'd':
DeleteEmployeeRecord();
break;
case 'P':
case 'p':
PrintAllEmployeeRecords();
break;
default:
break;
}
} while ((choice.KeyChar != 'Q') && (choice.KeyChar != 'q'));
}
private void FindAndPrintEmployeeRecord()
{
throw new NotImplementedException();
}
private void PrintAllEmployeeRecords()
{
Console.WriteLine("***** PrintAllEmployeeRecords");
}
private void DeleteEmployeeRecord()
{
Console.WriteLine("***** DeleteEmployeeRecord");
}
private void UpdateEmployeeRecord()
{
Console.WriteLine("***** UpdateEmployeeRecord");
}
// Find a student object in the array.
// Inputs: email - a string containing the email address of
// the student that is being searched for
// Output: the student object with a matching email, otherwise null ref
private Employee FindEmployeeRecord(string socialSecurityNumber)
{
// look through the collection at each employee
foreach (var emp in employees)
{
// if we find a student with matching social security number
if(emp.SocialSecurityNumber == socialSecurityNumber)
{
// return the object
return emp;
}
}
// if we get through the entire collection with no student
// object find that matches the search email,
// so return a null reference
return null;
}
private void CreateEmployeeRecord()
{
Console.WriteLine(" :: CreateStudentRecord");
//display prompt that asks for employee's social security number
Console.Write("Enter the social security number for the record to add: ");
//user types in the student email
string socialSecurityNumber = Console.ReadLine();
// check to see if record already exists in the database
// if it does, return back to main menu, issue a message
Employee emp = FindEmployeeRecord(socialSecurityNumber);
if(emp != null)
{
Console.WriteLine("Error: " + socialSecurityNumber + " is already in the database.");
return;
}
//display prompt that asks for type of student
Console.Write("Enter the type of employee: ");
ConsoleKeyInfo employeeType = Console.ReadKey();
//display prompt that asks for first name
Console.Write("Enter the first name: ");
string firstName = Console.ReadLine();
//display prompt that asks for last name
Console.Write("Enter the last name: ");
string lastName = Console.ReadLine();
// if type of student was U
if(employeeType.KeyChar == SALARIED_S || employeeType.KeyChar == SALARIED_s)
{
//display prompts for the weekly salary
Console.Write("Enter the weekly salary: ");
decimal weeklySalary = decimal.Parse(Console.ReadLine());
// make an undergrad student
emp = new Salaried(firstName, lastName, socialSecurityNumber, weeklySalary);
}
else if (employeeType.KeyChar == BASEPLUS_B || employeeType.KeyChar == BASEPLUS_b)
{
//if student type is BasePlus Employee prompt for base salary
Console.Write("Enter the Base Salary: ");
decimal baseSalary = decimal.Parse(Console.ReadLine());
// prompt for the Gross Sales
Console.Write("Enter the Gross Sales: ");
decimal grossSales = decimal.Parse(Console.ReadLine());
//prompt for the Commission Rate
Console.Write("Enter the Commission Rate: ");
decimal commissionRate = decimal.Parse(Console.ReadLine());
// make a grad student
emp = new BasePlus(firstName, lastName, socialSecurityNumber, grossSales, commissionRate, baseSalary);
}
else if (employeeType.KeyChar == COMMISSION_M || employeeType.KeyChar == COMMISSION_m)
{
// prompt for the Gross Sales
Console.Write("Enter the Gross Sales: ");
decimal grossSales = decimal.Parse(Console.ReadLine());
//prompt for the Commission Rate
Console.Write("Enter the Commission Rate: ");
decimal commissionRate = decimal.Parse(Console.ReadLine());
// make a grad student
emp = new Commission(firstName, lastName, socialSecurityNumber, grossSales, commissionRate);
}
else if (employeeType.KeyChar == HOURLY_H || employeeType.KeyChar == HOURLY_h)
{
//if student type is BasePlus Employee prompt for base salary
Console.Write("Enter the Hourly Wage: ");
decimal hourlyWage = decimal.Parse(Console.ReadLine());
// prompt for the Gross Sales
Console.Write("Enter the Hours Worked: ");
decimal hoursWorked = decimal.Parse(Console.ReadLine());
// make a grad student
emp = new Hourly(firstName, lastName, socialSecurityNumber, hourlyWage, hoursWorked);
}
else
{
Console.WriteLine(employeeType.KeyChar + " is not a type of employee.");
return;
}
//display the current student data and ask for confirm
// ask user to confirm
// the db saves the record, and returns to main menu - steps:
// and insert the newly created student object into the array
// 1 - make an array that is 1 "bigger" than students
Employee[] biggerEmployeeArray = new Employee[employees.Length + 1];
// 2 - copy all objects from students to the bigger array
// (at the same index val)
for (int i = 0; i < employees.Length; i++)
{
biggerEmployeeArray[i] = employees[i];
}
// put stu in the last slot in the bigger array
biggerEmployeeArray[biggerEmployeeArray.Length - 1] = emp;
// make the students ref point to the bigger array
employees = biggerEmployeeArray;
}
private void PresentUserInterface()
{
Console.WriteLine(@"
Select from the following options:
[C]reate (a new employee)
[F]ind (search for a record)
[U]pdate
[D]elete
[P]rint all records in the database
[Q]uit
");
}
private void DisplayProgramExplanation()
{
Console.WriteLine(@"
********************************************
Welcome to the Employee Database application.
You can execute most typical db commnds,
including
[C]reate, [R]ead [U]pdate, and [D]elete
for the employee records that are present.
");
}
}
}
코드가 너무 많아서 여기에 모든 것을 넣지 않았습니다. 지금 보여주고있는 것은 "Employee DB"클래스 내에서 "만드는 방법"입니다. 나는 모든 것을 여기에 올리면 더 의미가 있다고 생각합니다. –