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Diffstat (limited to 'doc/index.html')
| -rw-r--r-- | doc/index.html | 22 |
1 files changed, 1 insertions, 21 deletions
diff --git a/doc/index.html b/doc/index.html index 8d03c45..472f7cd 100644 --- a/doc/index.html +++ b/doc/index.html @@ -193,7 +193,7 @@ that a read should operate on a particular version of the DB state. If <code>ReadOptions::snapshot</code> is NULL, the read will operate on an implicit snapshot of the current state. <p> -Snapshots typically are created by the DB::GetSnapshot() method: +Snapshots are created by the DB::GetSnapshot() method: <p> <pre> leveldb::ReadOptions options; @@ -208,26 +208,6 @@ Note that when a snapshot is no longer needed, it should be released using the DB::ReleaseSnapshot interface. This allows the implementation to get rid of state that was being maintained just to support reading as of that snapshot. -<p> -A Write operation can also return a snapshot that -represents the state of the database just after applying a particular -set of updates: -<p> -<pre> - leveldb::Snapshot* snapshot; - leveldb::WriteOptions write_options; - write_options.post_write_snapshot = &snapshot; - leveldb::Status status = db->Write(write_options, ...); - ... perform other mutations to db ... - - leveldb::ReadOptions read_options; - read_options.snapshot = snapshot; - leveldb::Iterator* iter = db->NewIterator(read_options); - ... read as of the state just after the Write call returned ... - delete iter; - - db->ReleaseSnapshot(snapshot); -</pre> <h1>Slice</h1> <p> The return value of the <code>it->key()</code> and <code>it->value()</code> calls above |