mirror of
https://gitee.com/blackfox/geekai.git
synced 2024-12-05 13:47:47 +08:00
111 lines
2.1 KiB
Go
111 lines
2.1 KiB
Go
package store
|
|
|
|
import (
|
|
"encoding/json"
|
|
|
|
"github.com/syndtr/goleveldb/leveldb"
|
|
"github.com/syndtr/goleveldb/leveldb/util"
|
|
)
|
|
|
|
type LevelDB struct {
|
|
driver *leveldb.DB
|
|
}
|
|
|
|
func NewLevelDB() (*LevelDB, error) {
|
|
db, err := leveldb.OpenFile("data", nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &LevelDB{
|
|
driver: db,
|
|
}, nil
|
|
}
|
|
|
|
func (db *LevelDB) Put(key string, value interface{}) error {
|
|
var byteData []byte
|
|
if v, ok := value.(string); ok {
|
|
byteData = []byte(v)
|
|
} else {
|
|
b, err := json.Marshal(value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
byteData = b
|
|
}
|
|
return db.driver.Put([]byte(key), byteData, nil)
|
|
}
|
|
|
|
func (db *LevelDB) Get(key string) ([]byte, error) {
|
|
bytes, err := db.driver.Get([]byte(key), nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return bytes, nil
|
|
}
|
|
|
|
func (db *LevelDB) Search(prefix string) []string {
|
|
var items = make([]string, 0)
|
|
iter := db.driver.NewIterator(util.BytesPrefix([]byte(prefix)), nil)
|
|
defer iter.Release()
|
|
|
|
for iter.Next() {
|
|
items = append(items, string(iter.Value()))
|
|
}
|
|
return items
|
|
}
|
|
|
|
type PageVo struct {
|
|
Items []string
|
|
Page int
|
|
PageSize int
|
|
Total int
|
|
TotalPage int
|
|
}
|
|
|
|
func (db *LevelDB) SearchPage(prefix string, page int, pageSize int) *PageVo {
|
|
var items = make([]string, 0)
|
|
iter := db.driver.NewIterator(util.BytesPrefix([]byte(prefix)), nil)
|
|
defer iter.Release()
|
|
|
|
res := &PageVo{Page: page, PageSize: pageSize}
|
|
// 计算数据总数和总页数
|
|
total := 0
|
|
for iter.Next() {
|
|
total++
|
|
}
|
|
res.TotalPage = (total + pageSize - 1) / pageSize
|
|
res.Total = total
|
|
|
|
// 计算目标页码的起始和结束位置
|
|
start := (page - 1) * pageSize
|
|
if start > total {
|
|
return nil
|
|
}
|
|
end := start + pageSize
|
|
if end > total {
|
|
end = total
|
|
}
|
|
|
|
// 跳转到目标页码的起始位置
|
|
count := 0
|
|
for iter.Next() {
|
|
if count >= start {
|
|
items = append(items, string(iter.Value()))
|
|
}
|
|
count++
|
|
}
|
|
iter.Release()
|
|
res.Items = items
|
|
return res
|
|
}
|
|
|
|
func (db *LevelDB) Delete(key string) error {
|
|
return db.driver.Delete([]byte(key), nil)
|
|
}
|
|
|
|
// Close release resources
|
|
func (db *LevelDB) Close() error {
|
|
return db.driver.Close()
|
|
}
|