public void AddNewEntity()
{
int count = 0;
using (var context = new MyContext(ConnectionString))
{
context.Database.Log = cql =>
{
count++;
Debug.WriteLine("EXECUTE QUERY: " + cql);
};
var newValue = new MyValue { Id = 20000, Value = "Hallo 20000" };
bool added = context.Values.Add(newValue);
Assert.IsTrue(added);
context.SaveChanges();
//try save again (should do nothing)
context.SaveChanges();
Assert.AreEqual(1, count, "Save again introduces new query!");
//try find (should do nothing)
var entity = context.Values.Find(20000);
Assert.AreSame(newValue, entity);
Assert.AreEqual(1, count, "Find introduces new query!");
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(20000);
Assert.IsNotNull(value);
Assert.AreEqual("Hallo 20000", value.Value);
}
}
public void AddAndChangeNewEntity()
{
int count = 0;
using (var context = new MyContext(ConnectionString))
{
context.Database.Log = cql =>
{
count++;
Debug.WriteLine("EXECUTE QUERY: " + cql);
};
var newValue = new MyValue { Id = 30000, Value = "Hallo 30000" };
bool added = context.Values.Add(newValue);
Assert.IsTrue(added);
IEntityEntry entry = context.ChangeTracker.Entry(newValue);
Assert.IsNotNull(entry);
Assert.AreEqual(EntityState.Added, entry.State);
context.SaveChanges();
Assert.AreEqual(EntityState.Unchanged, entry.State);
newValue.Value = "Hallo weer!";
context.SaveChanges();
Assert.AreEqual(2, count, "Where is my query?");
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(30000);
Assert.IsNotNull(value);
Assert.AreEqual("Hallo weer!", value.Value);
}
}
public void SelectAndUpdate()
{
using (var context = new MyContext(ConnectionString))
{
context.Database.Log = cql => Debug.WriteLine("EXECUTE QUERY: " + cql);
var query = context.Values.Where(r => new[] { 201, 202, 203, 204 }.Contains(r.Id)).ToList();
query[1].Value = "Zo gaan we weer verder";
context.SaveChanges();
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(202);
Assert.IsNotNull(value);
Assert.AreEqual("Zo gaan we weer verder", value.Value);
}
}
public void UpdateInExternalTransaction()
{
using (var connection = new CqlConnection(ConnectionString))
using (var transaction = connection.BeginTransaction())
using (var context = new MyContext(connection, false))
{
context.Database.Log = cql => Debug.WriteLine("EXECUTE QUERY: " + cql);
context.Database.UseTransaction(transaction);
var value = context.Values.Find(500);
value.Value = "Hallo daar!";
context.SaveChanges(false);
var command = new CqlCommand(connection, "update myvalue set value='adjusted' where id=500");
command.Transaction = transaction;
command.ExecuteNonQuery();
transaction.Commit();
//accept all changes only after commit
context.AcceptAllChanges();
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(500);
Assert.IsNotNull(value);
Assert.AreEqual("adjusted", value.Value);
}
}
public void UpdateTwiceInTwoTransactions()
{
using (var context = new MyContext(ConnectionString))
{
context.Database.Log = cql => Debug.WriteLine("EXECUTE QUERY: " + cql);
var value = context.Values.Find(400);
using (var transaction1 = context.Database.BeginTransaction())
{
value.Value = "Hallo daar!";
context.SaveChanges();
transaction1.Commit();
}
using (var transaction2 = context.Database.BeginTransaction())
{
transaction2.BatchType = CqlBatchType.Unlogged;
value.Value = "Nog een keer";
context.SaveChanges();
transaction2.Commit();
}
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(400);
Assert.IsNotNull(value);
Assert.AreEqual("Nog een keer", value.Value);
}
}
public void UpdateTwiceInSingleTransactionAndRollback()
{
using (var context = new MyContext(ConnectionString))
using (var transaction = context.Database.BeginTransaction())
{
context.Database.Log = cql => Debug.WriteLine("EXECUTE QUERY: " + cql);
var value = context.Values.Find(300);
value.Value = "Hallo daar!";
context.SaveChanges();
value.Value = "Oops...";
context.SaveChanges();
transaction.Rollback();
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(300);
Assert.IsNotNull(value);
Assert.AreEqual("Hallo 300", value.Value);
}
}
public void FindAndUpdate()
{
using (var context = new MyContext(ConnectionString))
{
context.Database.Log = cql => Debug.WriteLine("EXECUTE QUERY: " + cql);
var value = context.Values.Find(100);
value.Value = "Hallo daar!";
context.SaveChanges();
}
using (var context = new MyContext(ConnectionString))
{
var value = context.Values.Find(100);
Assert.IsNotNull(value);
Assert.AreEqual("Hallo daar!", value.Value);
}
}
