/// <summary>
/// 删除数据
/// </summary>
/// <param name="obj"></param>
/// <returns>返回受影响的行数</returns>
public static int delete(Object obj)
{
if (obj == null)
{
throw new ArgumentNullException();
}
int num = ObjectDB.Delete((IEntity)obj);
ObjectPool.Delete((IEntity)obj);
return(num);
}
static void Main(string[] args)
{
Guid guid;
// create a database
var pathToDataDir = "db-data";
var fileStorageEngine = FileStorageEngineFactory.Create(pathToDataDir, SIZE_1G, MAX_ENTRIES);
using (var db = new ObjectDB <object>(fileStorageEngine, new BinaryFormatterSerializer()))
{
// create
var data = new MyData(1, "hello world");
Console.WriteLine("inserting object: " + data);
guid = db.Insert(data);
Console.WriteLine("GUID of inserted object={0}", guid);
// read
data = db.Read <MyData>(guid);
Console.WriteLine("read object: {0}", data);
// update
data.Text = "very interesting text";
Console.WriteLine("updating object: {0}", data);
db.Update(guid, data);
}
// re-open existing databse
using (var db = new ObjectDB <object>(FileStorageEngineFactory.Open(pathToDataDir), new BinaryFormatterSerializer()))
{
// read after re-opening the db
var data = db.Read <MyData>(guid);
Console.WriteLine("object after re-opening the DB: {0}", data);
// delete
Console.WriteLine("deleting object");
db.Delete(guid);
// RecordNotFoundException after deletion
try
{
db.Read <MyData>(guid);
}
catch (RecordNotFoundException)
{
Console.WriteLine("object was deleted");
}
}
}
private void Delete(BenchmarkIteration iter, ObjectDB <IFlatbufferObject> db, IFlatbufferObject data)
{
List <Guid> ids = new List <Guid>();
for (var i = 0; i < Benchmark.InnerIterationCount; i++)
{
ids.Add(db.Insert(data));
}
using (iter.StartMeasurement())
{
foreach (var id in ids)
{
db.Delete(id);
}
}
}
