public Erase ( |
||
txn | The optional Transaction | |
key | byte | The key of the item to delete |
Результат | void |
private void EraseUnknownKey() { Upscaledb.Environment env = new Upscaledb.Environment(); Database db = new Database(); byte[] k = new byte[5]; env.Create("ntest.db"); db = env.CreateDatabase(1); try { db.Erase(k); } catch (DatabaseException e) { Assert.AreEqual(UpsConst.UPS_KEY_NOT_FOUND, e.ErrorCode); } db.Close(); env.Close(); }
private void EraseKeyNegative() { Upscaledb.Environment env = new Upscaledb.Environment(); Database db = new Database(); byte[] k = new byte[5]; env.Create("ntest.db"); db = env.CreateDatabase(1); try { db.Erase(null); } catch (NullReferenceException) { } db.Close(); env.Close(); }
private void EraseKeyTwice() { Upscaledb.Environment env = new Upscaledb.Environment(); Database db = new Database(); byte[] k = new byte[5]; byte[] r = new byte[5]; env.Create("ntest.db"); db = env.CreateDatabase(1); db.Insert(k, r); byte[] r2 = db.Find(k); checkEqual(r, r2); db.Erase(k); try { db.Erase(k); } catch (DatabaseException e) { Assert.AreEqual(UpsConst.UPS_KEY_NOT_FOUND, e.ErrorCode); } db.Close(); env.Close(); }
static void Main(string[] args) { byte[] key = new byte[5]; byte[] record = new byte[5]; Upscaledb.Environment env = new Upscaledb.Environment(); Database db = new Database(); /* * first, create a new Database */ env.Create("test.db"); db = env.CreateDatabase(1); /* * now we can insert, delete or lookup values in the Database * * for our test program, we just insert a few values, then look them * up, then delete them and try to look them up again (which will fail). */ for (int i = 0; i < LOOP; i++) { key[0] = (byte)i; record[0] = (byte)i; db.Insert(key, record); } /* * now look up all values */ for (int i = 0; i < LOOP; i++) { key[0] = (byte)i; byte[] r = db.Find(key); /* * check if the value is ok */ if (r[0] != (byte)i) { Console.Out.WriteLine("db.Find() returned bad value"); return; } } /* * close the Database handle, then re-open it (just to demonstrate how * to open a Database file) */ db.Close(); env.Close(); env.Open("test.db"); db = env.OpenDatabase(1); /* * now erase all values */ for (int i = 0; i < LOOP; i++) { key[0] = (byte)i; db.Erase(key); } /* * once more we try to find all values... every db.Find() call must * now fail with HAM_KEY_NOT_FOUND */ for (int i = 0; i < LOOP; i++) { key[0] = (byte)i; try { byte[] r = db.Find(key); } catch (DatabaseException e) { if (e.ErrorCode != UpsConst.UPS_KEY_NOT_FOUND) { Console.Out.WriteLine("db.Find() returned error " + e); return; } } } /* * We're done! No need to close the Database handle - it's closed automatically */ Console.Out.WriteLine("Success!"); }