forked from mirror/ledisdb
55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package leveldb
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// #cgo LDFLAGS: -lleveldb
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// #include <stdint.h>
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// #include "leveldb/c.h"
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import "C"
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type Snapshot struct {
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db *DB
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snap *C.leveldb_snapshot_t
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readOpts *ReadOptions
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iteratorOpts *ReadOptions
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}
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func (s *Snapshot) Close() {
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C.leveldb_release_snapshot(s.db.db, s.snap)
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s.iteratorOpts.Close()
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s.readOpts.Close()
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}
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func (s *Snapshot) Get(key []byte) ([]byte, error) {
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return s.db.get(s.readOpts, key)
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}
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func (s *Snapshot) NewIterator() *Iterator {
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it := new(Iterator)
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it.it = C.leveldb_create_iterator(s.db.db, s.iteratorOpts.Opt)
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return it
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}
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func (s *Snapshot) RangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
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return newRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, 0, -1, IteratorForward)
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}
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func (s *Snapshot) RevRangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
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return newRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, 0, -1, IteratorBackward)
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}
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//limit < 0, unlimit
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//offset must >= 0, if < 0, will get nothing
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func (s *Snapshot) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, limit int) *RangeLimitIterator {
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return newRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, offset, limit, IteratorForward)
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}
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//limit < 0, unlimit
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//offset must >= 0, if < 0, will get nothing
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func (s *Snapshot) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, limit int) *RangeLimitIterator {
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return newRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, offset, limit, IteratorBackward)
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}
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