public static void Delete(Employee employee)
{
var context = new SoftUniEntities();
context.Entry(employee).State = EntityState.Deleted;
context.SaveChanges();
}
public static void PrintNamesWithLinqQuery()
{
var context = new SoftUniEntities();
var employee = context.Employees
.Where(e => e.Projects.Any(p => p.StartDate.Year == 2002))
.Select(e => e.FirstName);
List<string> employees = employee.ToList();
Console.WriteLine(string.Join(" | ", employees));
}
public static void Add(Employee employee)
{
var context = new SoftUniEntities();
var entry = context.Entry(employee);
entry.State = EntityState.Added;
context.Employees.Add(employee);
context.SaveChanges();
}
public static void ConcurrentEmployeeNameChanges(string firstConcurrent, string secondConcurrent)
{
var context1 = new SoftUniEntities();
var employee1 = context1.Employees.Find(1);
employee1.FirstName = firstConcurrent;
var context2 = new SoftUniEntities();
var employee2 = context2.Employees.Find(1);
employee2.FirstName = secondConcurrent;
context1.SaveChanges();
context2.SaveChanges(); //It will be executed
}
public static void PrintNamesWithNativeQuery()
{
var context = new SoftUniEntities();
var employee = context.Database.SqlQuery<Employee>(
"SELECT FirstName FROM Employees e" +
"WHERE EXISTS(SELECT p.ProjectID FROM Projects p " +
"LEFT JOIN EmployeesProjects ep " +
"ON p.ProjectID = ep.ProjectID " +
"LEFT JOIN Employees em " +
"ON ep.EmployeeID = em.EmployeeID " +
"WHERE em.EmployeeID = e.EmployeeID " +
"AND YEAR(p.StartDate) = 2002)")
.ToList();
Console.WriteLine(string.Join(" | ", employee));
}
//3.Get an employee by id (e.g. 147). Select only his/her first name,
//last name, job title and projects (only their names).
//The projects should be ordered by name (ascending).
public static void FindEmployeeById(int id)
{
var context = new SoftUniEntities();
var employeeById = context.Employees.Find(id);
var employeeProject = employeeById.Projects
.ToList().OrderBy(p => p.Name);
Console.WriteLine("Id = {3} {0} {1} - ({2}) - Projects:",
employeeById.FirstName,
employeeById.LastName,
employeeById.JobTitle,
employeeById.EmployeeID);
foreach (var pr in employeeProject)
{
Console.WriteLine(pr.Name);
}
}
public static void Modify(Employee employee, string newName)
{
var context = new SoftUniEntities();
string[] name = Regex.Split(newName.Trim(), @"\s+");
string firstName = Regex.Split(newName.Trim(), @"\s+")[0];
employee.FirstName = firstName;
if (name.Length == 2)
{
string lastName = Regex.Split(newName.Trim(), @"\s+")[0];
employee.LastName = lastName;
}
var entry = context.Entry(employee);
entry.State = EntityState.Modified;
context.SaveChanges();
}
//4.Find all departments with more than 5 employees.
//Order them by employee count (ascending).
//Select the department name, manager name and first name, last name, hire date and job title
//of every employee.
public static void FindDepartmentByEmployeeCount()
{
var context = new SoftUniEntities();
var departments = context.Departments
.Where(d => d.Employees.Count > 5)
.OrderBy(d => d.Employees.Count)
.Select(d => new
{
DepartmentName = d.Name,
ManagerName = d.Employee.FirstName + " " + d.Employee.LastName,
EmployeesCount = d.Employees.Count
});
foreach (var dep in departments)
{
Console.WriteLine("--{0} - Manager: {1}, Employees: {2}",
dep.DepartmentName,
dep.ManagerName,
dep.EmployeesCount);
}
}
//2.Find all addresses, ordered by the number of employees who live there (descending),
//then by town name (ascending).
//Take only the first 10 addresses and select their address text, town name and employee count.
public static void FindEmployeeByAddress()
{
var context = new SoftUniEntities();
var addresses = context.Addresses
.OrderByDescending(a => a.Employees.Count)
.ThenBy(a => a.Town.Name)
.Take(10)
.Select(a => new
{
a.AddressText,
TownName = a.Town.Name,
EmployeeCount = a.Employees.Count
});
foreach (var address in addresses)
{
Console.WriteLine("{0}, {1} - {2} employees ",
address.AddressText,
address.TownName,
address.EmployeeCount);
}
}
//1.Find all employees who have projects started in the time period 2001 - 2003 (inclusive).
//Select each employee's first name, last name and manager name and
//each of their projects' name, start date, end date.
public static void FindEmployeeByProjectInRange()
{
var context = new SoftUniEntities();
var employeesAndProjects = context.Employees
.Where(e => e.Projects
.Any(p => p.StartDate.Year >= 2001 && p.StartDate.Year <= 2003))
.Select(e => new
{
EmployeeFullName = e.FirstName + " " + e.LastName,
Projects = e.Projects.Select(p => new
{
ProjectName = p.Name,
p.StartDate,
p.EndDate
}),
ManagerFullName = e.Employee1.FirstName + " " + e.Employee1.LastName
});
foreach (var emp in employeesAndProjects)
{
Console.WriteLine(emp.EmployeeFullName + " - Manager - " + emp.ManagerFullName + "\n Projects:{");
foreach (var project in emp.Projects)
{
Console.WriteLine("\tProjectName - " + project.ProjectName
+ " - StartDate " + project.StartDate.ToShortDateString());
}
Console.WriteLine(" }");
}
}