Basic knowledge of Redis

Preface

Company hand-Tour using Redis as a database, although doing testing work, but still feel it necessary to understand some of the relevant concepts of Redis and basic operations. Before doing the page trip test involves memcache,Tokyo tyrant but using tools developed by others to understand almost zero. Learn the following commands to complete the basic query insert operation.

One, basic understanding:

       redis key-value memcache flush save on the hard drive.

1          can be seen as memcache

2 support for network, journaled, Key-value-type databases

3        supports regular numeric, string,Lists,sets,Sorted Sets,Hashes.

4 Get help information:

Second, the basic operation:

Set key value	Set Key and its value
Get key	Querying data
Del key	Delete a key value
exists key	Verify that the key value exists, ' means not present, 1 stands for existence
setnx key	key already exists return 0 no return 1
Setex Key	expiry date Ten seconds: Setex name Jake
SetRange	settings specify key :setrange Key 8 163.com will key eighth character and subsequent 7 163.co
mset key1 key2 ...	set multiple at once Span style= "font-family: ' Microsoft yahei ', SimSun, Verdana, Arial, Helvetica, sans-serif;line-height:21px;font-size : 10.5pt; " >key
mget key1 Key2 ... ..	Get the value of multiple keys at once
msetnx key1 Key2 ... ..	Set multiple key-value pairs at once and determine if they already exist
Getset Key	Sets the value of key and returns the old value of key
GetRange key N1 N2	Gets the substring of the specified range specified by key The last character is-1, descending forward in turn
INCR key	Value plus 1
Incrby Key Intvalue	Plus the specified value
Decr	Value minus 1
Decrby Key Intvalue	Subtract the specified value
Append key string	Append string at end
Strlen Key	Gets the length of the specified string

Third, the hash table operation, especially for storing objects:

1. hset key field value

Summary:set the string value of a hash field

2. hsetnx key field value

Summary:set the value of a hash field, only if the field does not exist

3. hmset key field value [field value ...]

Summary:set multiple hash fields to multiple values

4. hget key Field

Summary:get the value of a hash field

5. hmget key field [field ...]

Summary:get the values of all the given hash fields

6. Hincrby key field increment

Summary:increment the integer value of a hash field by the given number

7. hexists key Field

Summary:determine If a hash field exists

8. Hlen Key

Summary:get the number of fields in a hash

9, Hdel key key field [field ...]

Summary:delete one or more hash fields

10, Hkeys

Summary:get all the fields in a hash

11, Hvals

Summary:get all the values in a hash

12, Hgetall

Summary:get all, and values in a hash

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Basic knowledge of Redis