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update document

This commit is contained in:
siddontang 2014-07-09 10:26:15 +08:00
parent 961b4f393d
commit 5e87dc9437
4 changed files with 23 additions and 24 deletions
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10
leveldb/db.go
View File

@ -289,14 +289,16 @@ func (db *DB) RevRangeIterator(min []byte, max []byte, rangeType uint8) *RangeLi
return NewRevRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
}
//count < 0, unlimit
//offset must >= 0, if < 0, will get nothing
//count < 0, unlimit.
//
//offset must >= 0, if < 0, will get nothing.
func (db *DB) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
return NewRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
}
//count < 0, unlimit
//offset must >= 0, if < 0, will get nothing
//count < 0, unlimit.
//
//offset must >= 0, if < 0, will get nothing.
func (db *DB) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
return NewRevRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
}

11
leveldb/iterator.go
View File

@ -24,11 +24,14 @@ const (
)
// min must less or equal than max
//
// range type:
//
// close: [min, max]
// open: (min, max)
// lopen: (min, max]
// ropen: [min, max)
//
type Range struct {
Min []byte
Max []byte
@ -92,7 +95,7 @@ func (it *Iterator) RawValue() []byte {
return slice(unsafe.Pointer(vdata), int(C.int(vlen)))
}
// Copy key to b, if b len is small or nil, returns a new one
// Copy key to b, if b len is small or nil, returns a new one.
func (it *Iterator) BufKey(b []byte) []byte {
k := it.RawKey()
if k == nil {
@ -106,7 +109,7 @@ func (it *Iterator) BufKey(b []byte) []byte {
return append(b, k...)
}
// Copy value to b, if b len is small or nil, returns a new one
// Copy value to b, if b len is small or nil, returns a new one.
func (it *Iterator) BufValue(b []byte) []byte {
v := it.RawValue()
if v == nil {
@ -150,7 +153,7 @@ func (it *Iterator) Seek(key []byte) {
it.isValid = C.leveldb_iter_seek_ext(it.it, (*C.char)(unsafe.Pointer(&key[0])), C.size_t(len(key)))
}
// Finds by key, if not found, nil returns
// Finds by key, if not found, nil returns.
func (it *Iterator) Find(key []byte) []byte {
it.Seek(key)
if it.Valid() {
@ -165,7 +168,7 @@ func (it *Iterator) Find(key []byte) []byte {
return nil
}
// Finds by key, if not found, nil returns, else a reference of value returns
// Finds by key, if not found, nil returns, else a reference of value returns.
// you must be careful that it will be changed after next iterate.
func (it *Iterator) RawFind(key []byte) []byte {
it.Seek(key)

8
leveldb/options.go
View File

@ -55,14 +55,6 @@ func (o *Options) SetCache(cache *Cache) {
C.leveldb_options_set_cache(o.Opt, cache.Cache)
}
// func (o *Options) SetEnv(env *Env) {
// C.leveldb_options_set_env(o.Opt, env.Env)
// }
func (o *Options) SetInfoLog(log *C.leveldb_logger_t) {
C.leveldb_options_set_info_log(o.Opt, log)
}
func (o *Options) SetWriteBufferSize(s int) {
C.leveldb_options_set_write_buffer_size(o.Opt, C.size_t(s))
}

10
leveldb/snapshot.go
View File

@ -45,14 +45,16 @@ func (s *Snapshot) RevRangeIterator(min []byte, max []byte, rangeType uint8) *Ra
return NewRevRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
}
//count < 0, unlimit
//offset must >= 0, if < 0, will get nothing
//count < 0, unlimit.
//
//offset must >= 0, if < 0, will get nothing.
func (s *Snapshot) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
return NewRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
}
//count < 0, unlimit
//offset must >= 0, if < 0, will get nothing
//count < 0, unlimit.
//
//offset must >= 0, if < 0, will get nothing.
func (s *Snapshot) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
return NewRevRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
}