{"id":25858,"date":"2022-06-21T11:42:55","date_gmt":"2022-06-21T01:42:55","guid":{"rendered":"https:\/\/database.guide\/?p=25858"},"modified":"2022-06-21T11:42:55","modified_gmt":"2022-06-21T01:42:55","slug":"redis-psetex-command-explained","status":"publish","type":"post","link":"https:\/\/database.guide\/redis-psetex-command-explained\/","title":{"rendered":"Redis PSETEX Command Explained"},"content":{"rendered":"\n

The Redis PSETEX<\/code> command sets a key to hold a given string value, and sets that key to time out after a given number of milliseconds.<\/p>\n\n\n\n\n\n\n\n

Note:<\/strong> The SET<\/a><\/code> command can do the same thing, and it’s possible that the PSETEX<\/code> command may be deprecated at some point. Therefore, it’s probably a good idea to use SET<\/code> instead of PSETEX<\/code> if possible.<\/p>\n\n\n\n

Syntax<\/h2>\n\n\n\n

The syntax for PSETEX<\/code> goes like this:<\/p>\n\n\n\n

PSETEX key milliseconds value<\/code><\/pre>\n\n\n\n
Where key<\/code> is the key to set, milliseconds<\/code> is the number of milliseconds before it expires, and value<\/code> is the value to set.<\/p>\n\n\n\n
It’s the equivalent of the following:<\/p>\n\n\n\n
SET mykey value\nEXPIRE mykey milliseconds<\/code><\/pre>\n\n\n\n
Which is basically the same as doing this:<\/p>\n\n\n\n
SET mykey value PX milliseconds<\/code><\/pre>\n\n\n\n
Example<\/h2>\n\n\n\n
Here’s a simple example to demonstrate:<\/p>\n\n\n\n
PSETEX lunch 30000 \"Red Curry\"<\/code><\/pre>\n\n\n\n
Result:<\/p>\n\n\n\n
OK<\/pre>\n\n\n\n
Now, if I’m quick and use GET<\/code> to return the value before the 30000 milliseconds is up, I can see the value:<\/p>\n\n\n\n
GET lunch<\/code><\/pre>\n\n\n\n
Result:<\/p>\n\n\n\n
\"Red Curry\"<\/pre>\n\n\n\n
But if I wait until after the 30000 milliseconds is up, I get a null result:<\/p>\n\n\n\n
GET lunch<\/code><\/pre>\n\n\n\n
Result:<\/p>\n\n\n\n
(nil)<\/pre>\n\n\n\n
As mentioned, we can do the same thing with the SET<\/code> command, so it’s probably better to use that in case PSETEX<\/code> is deprecated at some point.<\/p>\n\n\n\n
There’s also a SETEX<\/code> command that does the same thing as PSETEX<\/code>, except that SETEX<\/code> uses seconds.<\/p>\n","protected":false},"excerpt":{"rendered":"
The Redis PSETEX command sets a key to hold a given string value, and sets that key to time out after a given number of milliseconds.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[153],"tags":[154,84,20],"class_list":["post-25858","post","type-post","status-publish","format-standard","hentry","category-redis","tag-commands","tag-string","tag-what-is"],"_links":{"self":[{"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/posts\/25858","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/comments?post=25858"}],"version-history":[{"count":2,"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/posts\/25858\/revisions"}],"predecessor-version":[{"id":25860,"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/posts\/25858\/revisions\/25860"}],"wp:attachment":[{"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/media?parent=25858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/categories?post=25858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/database.guide\/wp-json\/wp\/v2\/tags?post=25858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}