Software testing redis database

1.redis database

1.1NoSQL brief introduction

NoSQL There are many explanations ：（Not relational SQL） You mean for “ Non relationship SQL”.

NoSQL The database does not have a unified architecture , Two kinds of NoSQL The difference between databases is even far more than the difference between the two relational databases , so to speak , Various NoSQL Each product has its own advantages , The success of NoSQL It must be especially suitable for certain occasions or applications .

At present, there are many websites in China , Such as Taobao 、 JD.COM 、 Baidu and others are using NoSQL Products .

1.2redis brief introduction

redis It's a free and open source NoSQL product .

redis Use ANSI C Language writing , It's a key-value The storage system . It supports storage value There are many types , Include string、hash、list、set and zset（sorted set- Ordered set ）.

redis Periodically, updated data is written to disk or changes are written to an appended log file .

redis Is a high-performance key-value NoSQL product , It provides Java、C/C++,C#、PHP、 Etc. development interface , Easy to use .

1.3redis Basic operation

（1） Start the server

redis-sever

（2） Start client （ Chinese is not supported ）

redis-cli

（3） Start the client with the following command , Can display Chinese correctly

redis-cli --raw

（4） Run the test command

ping

Server reply PONG On behalf of success

1.4 Switch database

select Select database ,redis Have from 0 To 15,16 A database

select 3 choice 3 The database

select 0 choice 0 The database

The default choice is 0 The database

1.5redis Key value pair description

redis yes key-value Data structure of

Every data is a “ Key value pair ”

The type of key is string string

The types of values are divided into ： character string string、 Hash hash、 list list、 unordered set set、 Ordered set zset

1.5.1 character string string

set user1 aaa： Add a key user1 The value is aaa

setex user2 3 bbb : Set key value pairs user2 by ’bbb’, The expiration date is 3 second

mset user2 ccc user4 ddd user5 eee： Add multiple key value pairs at the same time

append user haha： Additional haha

get user1: obtain user1 Value

mget user1 user2 user3： Get multiple values

del user1: Delete value

del user2 user3: Delete multiple values

keys user1: Lookup key user1 Whether there is

keys *: Find all keys

exists user1: Lookup key , If there is a return 1, Returns if none exists 0

type user1: see user1 The type of the corresponding value

expire user1 100; Set expiration time for existing keys 100 second

ttl user1: In seconds , Return is greater than the 0 Represents the effective time , return -1 For forever , return -2 Key does not exist

1.5.2 Hash hash

1. A collection used to store key value pairs

2. The key in each hash can be understood as a field （field）, A field （field） Corresponds to a value value

3.hash The median value Type is string string

4. Field names in the same hash field Not to be repeated

hset huser1 name tom:hset key Field value

hmset huser2 name maru sex female: Add one huser2 Value has 2 individual

type huser1: see huser1 The type of

hkeys huser1: obtain huse1 All the fields of

hget huser1 name: obtain huser1 Of name The value corresponding to the field

hmget huser name sex: obtain huser1 Of name、sex The value corresponding to the field

hvals huser1: Get the values of all fields

hgetall huser1 ： Get all field names, including values

hdel huser1 sex: Delete huser1 Of sex The value corresponding to the field

del huser1: Delete huser1 All fields of

1.5.3list

lpush luser1 aa： Add... From the left side of the list luser1 The value is aa

rpush luser1 bb: Add... From the right side of the list bb

linsert luser1 before aa 11: stay aa Insert in front 11

linsert luser1 after aa 22: stay aa Insert... At the back 11

The index starts on the left , The index of the first value is 0, The index can be negative , It means counting from the tail ,-1 Represents the last value

lrange key 0 -1: Returns a list of 0 To the last value

lset user1 1 china : modify user1 The value of the second element of is China

Delete the duplicate values of the list ,count>0 Delete from beginning to end ,count<0 Delete... From tail to head ,count=0 Delete all values ,lrem luse1 -1 h1 Delete one from right to left h1,lrem luse1 0 h1 Delete all h1,lrem luse1 1 h1 Delete from left to right 1 individual h1

1.5.4set aggregate

Duplicate values are not allowed in the set , The values in the set can only be added and deleted , Do not modify

sadd suser2 aa bb cc: Add value to collection

smembers suser2 Display the values in the set

srem suser2 bb: Delete... From the collection bb

1.5.5zset Ordered set

Each value is associated with a score , Scores can be negative , Sort the values in the set by the size of the fractional value , Duplicate values are not allowed in the set , The values in the set can only be added and deleted , Do not modify

zadd zuser1 1 aa 5 bb 3 cc 8 dd: The added value will press scrore The size order of

zrange zuser1 0 -1: Return the values from the beginning to the end of the list

zrange zuser1 0 -1 withscores： Scores and values are displayed

zrangebyscore zuse1 2 6 return score stay 2-6 Between the value of the

zscore zuser1 dd ： The return value is dd Of score

zrem zuser1 dd : Delete

zremrangebyscore zuser1 0 10: adopt score Delete value

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