---
layout: post
title: redis 6：redis hash 命令操作
category: 技术
tags:  Redis
keywords: 
description: redis之hash命令的基本操作
---

{:toc}



### 1.删除一个或多个hash域


	HDEL key field [field ...]
	summary: Delete one or more hash fields
	since: 2.0.0

```redis
127.0.0.1:6379> HDEL hash1 name
(integer) 1
```





### 2.判断一个域是否存在


	HEXISTS key field
	summary: Determine if a hash field exists
	since: 2.0.0

```redis
127.0.0.1:6379> HEXISTS hash1 name
(integer) 0 #不存在返回0
127.0.0.1:6379> HEXISTS hash1 name2
(integer) 1 #存在返回1
```





### 3.获取一个hash域


	HGET key field
	summary: Get the value of a hash field
	since: 2.0.0

```redis
127.0.0.1:6379> HGET hash1 name2
"name22"
```




### 4.获取hash中所有的域和值


	HGETALL key
	summary: Get all the fields and values in a hash
	since: 2.0.0

```redis
127.0.0.1:6379> HGETALL hash1
1) "name"  #field名
2) "jing"  #value值
3) "name2" #field名
4) "jing2" #value值
5) "name3" #field名
6) "jing3" #value值
```






### 5.增加域的值(如果是int型)，增加increment


	HINCRBY key field increment
	summary: Increment the integer value of a hash field by the given number
	since: 2.0.0



### 6.增加域的值(float型),增加increment


	HINCRBYFLOAT key field increment
	summary: Increment the float value of a hash field by the given amount
	since: 2.6.0

```redis
127.0.0.1:6379> HSET hash1 num1 10
(integer) 1
127.0.0.1:6379> HINCRBY hash1 num1 2
(integer) 12
```




### 7.获取hash的所有域


	HKEYS key
	summary: Get all the fields in a hash
	since: 2.0.0

```redis
127.0.0.1:6379> HKEYS hash1
1) "name2"
2) "name3"
3) "num1"
```





### 8.获取hash中域的数据


	HLEN key
	summary: Get the number of fields in a hash
	since: 2.0.0

```redis
127.0.0.1:6379> HLEN hash1
(integer) 3
```






### 9.获取所有给定域的值


	HMGET key field [field ...]
	summary: Get the values of all the given hash fields
	since: 2.0.0

```redis
127.0.0.1:6379> HMGET hash1 name2 num1
1) "name22"
2) "12"
```





### 10.设置多个hash域对应多个hash值

	
	HMSET key field value [field value ...]
	summary: Set multiple hash fields to multiple values
	since: 2.0.0

```redis
127.0.0.1:6379> HMSET hash1 num2 12 name4 jing4 num3 33
OK
127.0.0.1:6379> HGETALL hash1
 1) "name2"
 2) "name22"
 3) "name3"
 4) "name33"
 5) "num1"
 6) "12"
 7) "num2"
 8) "12"
 9) "name4"
10) "jing4"
11) "num3"
12) "33"
```





### 11.设置hash域的字符串值


	HSET key field value
	summary: Set the string value of a hash field
	since: 2.0.0



### 12.只有当该域不存在时，设置hash的域的值


	HSETNX key field value
	summary: Set the value of a hash field, only if the field does not exist
	since: 2.0.0



### 13.获取hash的所有值


	HVALS key
	summary: Get all the values in a hash
	since: 2.0.0


```redis
127.0.0.1:6379> HVALS hash1
1) "name22"
2) "name33"
3) "12"
4) "12"
5) "jing4"
6) "33"
```