forked from mirror/ledisdb
60 lines
1.7 KiB
Markdown
60 lines
1.7 KiB
Markdown
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LedisDB is not Redis, so you can not use some Redis clients for LedisDB directly.
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But LedisDB uses Redis protocol for communication and many APIs are same as Redis,
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so you can easily write your own LedisDB client based on a Redis one.
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Before you write a client, you must know some differences between LedisDB and Redis.
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## Data Structure
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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.
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## Del
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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.
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+ KV: `del`, `mdel`
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+ Hash: `hclear`, `mhclear`
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+ List: `lclear`, `mlclear`
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+ Set: `sclear`, `msclear`
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+ Zset: `zclear`, `mzclear`
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+ Bitmap: `bclear`, `mbclear`
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## Expire, Persist, and TTL
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The same for Del.
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+ KV: `expire`, `persist`, `ttl`
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+ Hash: `hexpire`, `hpersist`, `httl`
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+ List: `lexpire`, `lpersist`, `lttl`
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+ Set: `sexpire`, `spersist`, `sttl`
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+ Zset: `zexpire`, `zpersist`, `zttl`
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+ Bitmap: `bexpire`, `bpersist`, `bttl`
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## ZSet
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ZSet only support int64 score, not double in Redis.
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## Transaction
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LedisDB supports ACID transaction using LMDB or BoltDB, maybe later it will support `multi`, `exec`, `discard`.
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Transaction API:
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+ `begin`
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+ `commit`
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+ `rollback`
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## Scan
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LedisDB supplies `xscan`, etc, to fetch data iteratively.
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+ KV: `xscan`
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+ Hash: `hxscan`
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+ List: `lxscan`
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+ Set: `sxscan`
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+ Zset: `zxscan`
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+ Bitmap: `bxscan`
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Of course, LedisDB has not implemented all APIs in Redis, you can see full commands in commands.json, commands.doc or [wiki](https://github.com/siddontang/ledisdb/wiki/Commands).
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