public void Snapshot()
{
// modify db
var writeOptions = LevelDBInterop.leveldb_writeoptions_create();
this.InnerPut(writeOptions, "key1", "value1");
LevelDBInterop.leveldb_writeoptions_destroy(writeOptions);
// create snapshot
var snapshot = LevelDBInterop.leveldb_create_snapshot(Database);
// modify db again
writeOptions = LevelDBInterop.leveldb_writeoptions_create();
this.InnerPut(writeOptions, "key2", "value2");
LevelDBInterop.leveldb_writeoptions_destroy(writeOptions);
// read from snapshot
var readOptions = LevelDBInterop.leveldb_readoptions_create();
LevelDBInterop.leveldb_readoptions_set_snapshot(readOptions, snapshot);
var val1 = this.InnerGet(readOptions, "key1");
Assert.Equal("value1", val1);
var val2 = this.InnerGet(readOptions, "key2");
Assert.Null(val2);
LevelDBInterop.leveldb_readoptions_destroy(readOptions);
// release snapshot
LevelDBInterop.leveldb_release_snapshot(Database, snapshot);
snapshot = IntPtr.Zero;
}
public void Enumerator()
{
var writeOptions = LevelDBInterop.leveldb_writeoptions_create();
this.InnerPut(writeOptions, "key1", "value1");
this.InnerPut(writeOptions, "key2", "value2");
this.InnerPut(writeOptions, "key3", "value3");
var entries = new List <KeyValuePair <string, string> >();
var readOptions = LevelDBInterop.leveldb_readoptions_create();
IntPtr iter = LevelDBInterop.leveldb_create_iterator(Database, readOptions);
for (LevelDBInterop.leveldb_iter_seek_to_first(iter);
LevelDBInterop.leveldb_iter_valid(iter) == 1;
LevelDBInterop.leveldb_iter_next(iter))
{
IntPtr len;
string key = GetValue(LevelDBInterop.leveldb_iter_key(iter, out len), len);
string value = GetValue(LevelDBInterop.leveldb_iter_value(iter, out len), len);
var entry = new KeyValuePair <string, string>(key, value);
entries.Add(entry);
}
LevelDBInterop.leveldb_iter_destroy(iter);
LevelDBInterop.leveldb_readoptions_destroy(readOptions);
Assert.Equal(3, entries.Count);
Assert.Equal("key1", entries[0].Key);
Assert.Equal("value1", entries[0].Value);
Assert.Equal("key2", entries[1].Key);
Assert.Equal("value2", entries[1].Value);
Assert.Equal("key3", entries[2].Key);
Assert.Equal("value3", entries[2].Value);
LevelDBInterop.leveldb_writeoptions_destroy(writeOptions);
}
public void Get()
{
var options = LevelDBInterop.leveldb_readoptions_create();
this.InnerPut(options, "key1", "value1");
var value1 = this.InnerGet(options, "key1");
Assert.Equal("value1", value1);
this.InnerPut(options, "key2", "value2");
var value2 = this.InnerGet(options, "key2");
Assert.Equal("value2", value2);
this.InnerPut(options, "key3", "value3");
var value3 = this.InnerGet(options, "key3");
Assert.Equal("value3", value3);
// verify checksums
LevelDBInterop.leveldb_readoptions_set_verify_checksums(options, 1);
value1 = this.InnerGet(options, "key1");
Assert.Equal("value1", value1);
// no fill cache
LevelDBInterop.leveldb_readoptions_set_fill_cache(options, 0);
value2 = this.InnerGet(options, "key2");
Assert.Equal("value2", value2);
LevelDBInterop.leveldb_readoptions_destroy(options);
}
public void Reopen()
{
LevelDBInterop.leveldb_close(Database);
Database = IntPtr.Zero;
var options = LevelDBInterop.leveldb_options_create();
IntPtr error;
Database = LevelDBInterop.leveldb_open(options, DatabasePath, out error);
LevelDBException.Check(error);
var readOptions = LevelDBInterop.leveldb_readoptions_create();
this.InnerGet(readOptions, "key1");
LevelDBInterop.leveldb_readoptions_destroy(readOptions);
}
public void Delete()
{
var writeOptions = LevelDBInterop.leveldb_writeoptions_create();
this.InnerPut(writeOptions, "key1", "value1");
var readOptions = LevelDBInterop.leveldb_readoptions_create();
var value1 = this.InnerGet(readOptions, "key1");
Assert.Equal("value1", value1);
this.InnerDelete(writeOptions, "key1");
value1 = this.InnerGet(readOptions, "key1");
Assert.Null(value1);
LevelDBInterop.leveldb_writeoptions_destroy(writeOptions);
LevelDBInterop.leveldb_readoptions_destroy(readOptions);
}
internal override void DestroyUnmanaged()
{
LevelDBInterop.leveldb_readoptions_destroy(_handle);
}
