github.com/dotlike13/wemix30_go@v1.8.23/ethdb/table.go (about) 1 // Copyright 2014 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package ethdb 18 19 type table struct { 20 db Database 21 prefix string 22 } 23 24 // NewTable returns a Database object that prefixes all keys with a given 25 // string. 26 func NewTable(db Database, prefix string) Database { 27 return &table{ 28 db: db, 29 prefix: prefix, 30 } 31 } 32 33 func (dt *table) Put(key []byte, value []byte) error { 34 return dt.db.Put(append([]byte(dt.prefix), key...), value) 35 } 36 37 func (dt *table) Has(key []byte) (bool, error) { 38 return dt.db.Has(append([]byte(dt.prefix), key...)) 39 } 40 41 func (dt *table) Get(key []byte) ([]byte, error) { 42 return dt.db.Get(append([]byte(dt.prefix), key...)) 43 } 44 45 func (dt *table) Delete(key []byte) error { 46 return dt.db.Delete(append([]byte(dt.prefix), key...)) 47 } 48 49 func (dt *table) Close() { 50 // Do nothing; don't close the underlying DB. 51 }