public Linq2SqlPerformanceTests()
{
using (var db = new DataClasses1DataContext())
{
// delete any records from previous run
var deptQuery = (from dept in db.Departments select dept).ToList();
foreach (var item in deptQuery)
{
db.Departments.DeleteOnSubmit(item);
}
db.SubmitChanges();
var personQuery = (from pers in db.Persons select pers).ToList();
foreach (var item in personQuery)
{
db.Persons.DeleteOnSubmit(item);
}
db.SubmitChanges();
Department myDepartment = new Department()
{
name = "Operations"
};
db.Departments.InsertOnSubmit(myDepartment);
db.SubmitChanges();
}
}
public void TestDelete()
{
using (var db = new DataClasses1DataContext())
{
// delete all records in the person table
DateTime startTime = DateTime.Now;
var personQuery = (from pers in db.Persons select pers).ToList();
foreach (var item in personQuery)
{
db.Persons.DeleteOnSubmit(item);
}
db.SubmitChanges();
TimeSpan elapsedTime = DateTime.Now - startTime;
Console.WriteLine("DELETE:" + elapsedTime.ToString());
}
}
public void TestUpdate()
{
using (var db = new DataClasses1DataContext())
{
// update all records in the person table
DateTime startTime = DateTime.Now;
var query = (from p in db.Persons select p).ToList();
foreach (var item in query)
{
item.last = item.last + "2";
}
db.SubmitChanges();
TimeSpan elapsedTime = DateTime.Now - startTime;
Console.WriteLine("UPDATE:" + elapsedTime.ToString());
}
}
public void TestSelect()
{
using (var db = new DataClasses1DataContext())
{
// select records from the person joined by department table
DateTime startTime = DateTime.Now;
for (int i = 0; i < 1000; i++)
{
var query = (from p in db.Persons
join d in db.Departments on p.department equals d.id
select p).ToList();
}
TimeSpan elapsedTime = DateTime.Now - startTime;
Console.WriteLine("SELECT:" + elapsedTime.ToString());
}
}
public void TestInsert()
{
using (var db = new DataClasses1DataContext())
{
// read first and last names
List<string> firstnames = new List<string>();
using (StreamReader sr = new StreamReader(@"..\..\Data\firstnames.txt"))
{
string line;
while ((line = sr.ReadLine()) != null)
firstnames.Add(line);
}
List<string> lastnames = new List<string>();
using (StreamReader sr = new StreamReader(@"..\..\Data\lastnames.txt"))
{
string line;
while ((line = sr.ReadLine()) != null)
lastnames.Add(line);
}
//test inserting 1000 records
DateTime startTime = DateTime.Now;
for (int j = 0; j < 10; j++)
{
for (int i = 0; i < 1000; i++)
{
Person personRecord = new Person()
{
first = firstnames[i],
last = lastnames[i],
department = 1
};
db.Persons.InsertOnSubmit(personRecord);
}
}
db.SubmitChanges();
TimeSpan elapsedTime = DateTime.Now - startTime;
Console.WriteLine("INSERT:" + elapsedTime.ToString());
//3.49 seconds
}
}
