Redis order sorting command

1. Redis Sequential sort command
   1. Other option module expansion order
   2. Indicates the order of the modules
   3. ️ Thank you for your

Redis Sequential sort command

redis> LPUSH today_cost 30 1.5 10 8(integer) 4#  Sort redis> SORT today_cost1) "1.5"2) "8"3) "10"4) "30"

The sorting key indication theory is to set up a linked list with a width similar to that of the ring , Each item of the linked list is a reassignment target construct , Depending on the module indicated by the taxonomy, the structure of the reassignment target is also different

The manager is

typedef struct _redisSortObject {    robj *obj;    union {        double score;        robj *cmpobj;    } u;} redisSortObject;

obj Point to the exact element values in the following table , The fractional value is the floating point of the value of the list item , Then according to the value of the integral, expand the order of the character size of the linked list , Then return the conclusion after the sequence to the customer

Other option module expansion order

The taxonomy instructs the manager to expand in character order , When the key sorting of string value is required , Insert alpha option

asc The options are in ascending order ,desc The options are in descending order ,limit Option is to restrict the sorted results ,by The option is to sort by the weight of the elements contained in the keys of some strings or hash keys ,get Option is to get the corresponding key value according to the sorting result ,store The option is to save the sorting results to the specified key

Indicates the order of the modules

The execution order of these options is sorted first , And then there was limit Options , Limit the length of sorting results , And then there was get Option to get external keys , And then there was store Option to save the result set .

In addition to receiving instructions , The sequence of other indicating modules has no impact on the result set

Okay , Today's content mainly explains redis Of sort Sort instruction and its parameters , such as asc Options are in ascending order ,desc Descending ,limit Limit the sorted results ,by Options are sorted by the key weight of the string ,get Option to extract the corresponding key value from the result output ,store The option is to save the sorting results to the specified key ,sort key The principle of command is to create a and key An array with the same list length , Each item of the array is redisSortObject structure , according to sort The options of the command are different redisSortObject It's also different in structure .

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