# HMSET
**HMSET key field value [field value ...]**
同时将多个 `field-value` (域-值)对设置到哈希表 `key` 中。
此命令会覆盖哈希表中已存在的域。
如果 `key` 不存在,一个空哈希表被创建并执行 [HMSET](#hmset) 操作。
**可用版本:**
>= 2.0.0
**时间复杂度:**
O(N), `N` 为 `field-value` 对的数量。
**返回值:**
如果命令执行成功,返回 `OK` 。当 `key` 不是哈希表(hash)类型时,返回一个错误。
```
redis> HMSET website google www.google.com yahoo www.yahoo.com
OK
redis> HGET website google
"www.google.com"
redis> HGET website yahoo
"www.yahoo.com"
```
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