2.2 KiB
LedisDB is not Redis, so you can not use some Redis clients for LedisDB directly. But LedisDB uses Redis protocol for communication and many APIs are same as Redis, so you can easily write your own LedisDB client based on a Redis one.
Before you write a client, you must know some differences between LedisDB and Redis.
Data Structure
LedisDB has no Strings data type but KV and Bitmap, any some Keys and Strings commands in Redis will only affect KV data, and "bit" commands affect Bitmap.
Del
In Redis, del can delete all type data, like String, Hash, List, etc, but in LedisDB, del can only delete KV data. To delete other type data, you will use "clear" commands.
- KV:
del,mdel - Hash:
hclear,hmclear - List:
lclear,lmclear - Set:
sclear,smclear - Zset:
zclear,zmclear - Bitmap:
bclear,bmclear
Expire, Persist, and TTL
The same for Del.
- KV:
expire,persist,ttl - Hash:
hexpire,hpersist,httl - List:
lexpire,lpersist,lttl - Set:
sexpire,spersist,sttl - Zset:
zexpire,zpersist,zttl - Bitmap:
bexpire,bpersist,bttl
ZSet
ZSet only support int64 score, not double in Redis.
Transaction
LedisDB supports ACID transaction using LMDB or BoltDB, maybe later it will support multi, exec, discard.
Transaction API:
begincommitrollback
Scan
LedisDB supplies xscan, xrevscan, etc, to fetch data iteratively and reverse iteratively.
- KV:
xscan,xrevscan - Hash:
hxscan,hxrevscan,xhscan,xhrevscan - List:
lxscan,lxrevscan,xlscan,xlrevscan - Set:
sxscan,sxrevscan,xsscan,xsrevscan - Zset:
zxscan,zxrevscan,xzscan,xzrevscan - Bitmap:
bxscan,bxrevscan,xbscan,xbrevscan
DUMP
- KV:
dump - Hash:
hdump - List:
ldump - Set:
sdump - ZSet:
zdump
LedisDB supports dump to serialize the value with key, the data format is the same as Redis, so you can use it in Redis and vice versa.
Of course, LedisDB has not implemented all APIs in Redis, you can see full commands in commands.json, commands.doc or wiki.