Documentation
¶
Index ¶
- Constants
- Variables
- type Batch
- type Database
- type LDBDatabase
- func (db *LDBDatabase) Close()
- func (db *LDBDatabase) Delete(key []byte) error
- func (db *LDBDatabase) Get(key []byte) ([]byte, error)
- func (db *LDBDatabase) Has(key []byte) (bool, error)
- func (db *LDBDatabase) LDB() *leveldb.DB
- func (db *LDBDatabase) Meter(prefix string)
- func (db *LDBDatabase) NewBatch() Batch
- func (db *LDBDatabase) NewIterator() iterator.Iterator
- func (db *LDBDatabase) Path() string
- func (db *LDBDatabase) Put(key []byte, value []byte) error
- type MemDatabase
- func (db *MemDatabase) Close()
- func (db *MemDatabase) Delete(key []byte) error
- func (db *MemDatabase) Get(key []byte) ([]byte, error)
- func (db *MemDatabase) Has(key []byte) (bool, error)
- func (db *MemDatabase) Keys() [][]byte
- func (db *MemDatabase) NewBatch() Batch
- func (db *MemDatabase) Put(key []byte, value []byte) error
- type Putter
Constants ¶
const IdealBatchSize = 100 * 1024
Code using batches should try to add this much data to the batch. The value was determined empirically. 批处理数据的最大值
Variables ¶
var OpenFileLimit = 64
Functions ¶
This section is empty.
Types ¶
type Batch ¶
Batch is a write-only database that commits changes to its host database when Write is called. Batch cannot be used concurrently. 批量操作，不能并发操作，当 Write 方法被调用的时候，数据库会提交写入的更改
func NewTableBatch ¶
NewTableBatch returns a Batch object which prefixes all keys with a given string.
type Database ¶
type Database interface {
Putter
Get(key []byte) ([]byte, error)
Has(key []byte) (bool, error)
Delete(key []byte) error
Close()
NewBatch() Batch
}
Database wraps all database operations. All methods are safe for concurrent use. 数据库接口定义了所有的数据库操作， 所有的方法都是多线程安全的。
type LDBDatabase ¶
type LDBDatabase struct {
// contains filtered or unexported fields
}
ldb 数据对象
func NewLDBDatabase ¶
func NewLDBDatabase(file string, cache int, handles int) (*LDBDatabase, error)
NewLDBDatabase returns a LevelDB wrapped object. 新建 level DB 对象
func (*LDBDatabase) Close ¶
func (db *LDBDatabase) Close()
func (*LDBDatabase) Delete ¶
func (db *LDBDatabase) Delete(key []byte) error
Delete deletes the key from the queue and database
func (*LDBDatabase) Get ¶
func (db *LDBDatabase) Get(key []byte) ([]byte, error)
Get returns the given key if it's present.
func (*LDBDatabase) LDB ¶
func (db *LDBDatabase) LDB() *leveldb.DB
func (*LDBDatabase) Meter ¶
func (db *LDBDatabase) Meter(prefix string)
Meter configures the database metrics collectors and 初始化 meter 参数 geth --metrics: 可以启动性能指标收集和报告
func (*LDBDatabase) NewBatch ¶
func (db *LDBDatabase) NewBatch() Batch
func (*LDBDatabase) NewIterator ¶
func (db *LDBDatabase) NewIterator() iterator.Iterator
func (*LDBDatabase) Path ¶
func (db *LDBDatabase) Path() string
Path returns the path to the database directory.
type MemDatabase ¶
type MemDatabase struct {
// contains filtered or unexported fields
}
* This is a test memory database. Do not use for any production it does not get persisted
func (*MemDatabase) Close ¶
func (db *MemDatabase) Close()
func (*MemDatabase) Delete ¶
func (db *MemDatabase) Delete(key []byte) error
func (*MemDatabase) Keys ¶
func (db *MemDatabase) Keys() [][]byte
func (*MemDatabase) NewBatch ¶
func (db *MemDatabase) NewBatch() Batch
Source Files