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62 lines
1.5 KiB
62 lines
1.5 KiB
package store
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import (
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"github.com/lunny/nodb/store/driver"
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)
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type DB struct {
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driver.IDB
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}
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func (db *DB) NewIterator() *Iterator {
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it := new(Iterator)
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it.it = db.IDB.NewIterator()
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return it
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}
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func (db *DB) NewWriteBatch() WriteBatch {
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return db.IDB.NewWriteBatch()
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}
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func (db *DB) NewSnapshot() (*Snapshot, error) {
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var err error
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s := &Snapshot{}
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if s.ISnapshot, err = db.IDB.NewSnapshot(); err != nil {
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return nil, err
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}
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return s, nil
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}
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func (db *DB) RangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
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return NewRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
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}
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func (db *DB) RevRangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
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return NewRevRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
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}
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//count < 0, unlimit.
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//
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//offset must >= 0, if < 0, will get nothing.
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func (db *DB) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
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return NewRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
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}
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//count < 0, unlimit.
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//
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//offset must >= 0, if < 0, will get nothing.
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func (db *DB) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
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return NewRevRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
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}
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func (db *DB) Begin() (*Tx, error) {
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tx, err := db.IDB.Begin()
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if err != nil {
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return nil, err
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}
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return &Tx{tx}, nil
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}
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