{"id":23789,"date":"2022-11-28T10:07:16","date_gmt":"2022-11-28T04:37:16","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-i-have-a-table-with-a-status-however-i-want-it-to-change-status-every-10-minutes-im-using-postgresql\/"},"modified":"2022-11-28T10:07:16","modified_gmt":"2022-11-28T04:37:16","slug":"solved-i-have-a-table-with-a-status-however-i-want-it-to-change-status-every-10-minutes-im-using-postgresql","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-i-have-a-table-with-a-status-however-i-want-it-to-change-status-every-10-minutes-im-using-postgresql\/","title":{"rendered":"[Solved] I have a table with a status however I want it to change status every 10 minutes. I&#8217;m using Postgresql"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-58004859\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"58004859\" data-parentid=\"58000659\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I can see what you&#8217;re after although there is a big omission: What happens when the status has reached &#8216;Z&#8217; and it is time to update? More on that later.<\/p>\n<p>Your request has 2 components, actually getting a process to run and a rolling update procedure (script) for the status. Well, Postgres has no native functionally for initiating a script. You&#8217;ll have to setup a cron job, or an entry is what ever job scheduler you have. The update process is not all that difficult, except for the undefined &#8216;Z&#8217; status problem. (So when that happens I&#8217;ll just repeat the A-Z extending the code length (sort of like excel names columns).<\/p>\n<p>The basic update needed is to simply add 1 to the current value. But of course the statement &#8221; &#8216;A&#8217;+1 &#8221; doesn&#8217;t work, but the result can be obtained with the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.postgresql.org\/docs\/9.6\/functions-string.html\">CHR and ASCII<\/a> functions. Chr(ascii(&#8216;A&#8217;)+1)) effectively accomplishes that so your update could be accomplished as:<\/p>\n<pre><code>Update table_name set status = chr(ascii(status)+1);\n<\/code><\/pre>\n<p>However, that fails once the status reaches &#8216;Z&#8217;. Well it doesn&#8217;t fail in the since of generating an error, but it produces &#8216;[&#8216;. The following script produces &#8216;AA&#8217; in the above case, and each time status reaches &#8216;&#8230;Z&#8217; the next status becomes &#8216;&#8230;AA&#8217;.<\/p>\n<pre><code>--- setup \ndrop table if exists current_stat;\ncreate table current_stat(id serial,status text,constraint status_alpha_ck check( status ~ '^[A-Z]+'));\ninsert into current_stat(status) values (null), ('A'), ('B'), ('Y'), ('Z'), ('AA'), ('ABZ')\n\n--- Update SQL\nwith curr_stat as\n   ( select id, status\n          , chr(ascii(substring(status,char_length(status),1))+1) nstat\n          , char_length(status) lstat from current_stat)  \nupdate current_stat cs\n  set status = ( select case when status is null or lstat &lt; 1     then 'A'\n                             when substring(status,lstat,1) = 'Z' then overlay( status placing 'AA' from lstat for 2)\n                             else overlay( status placing nstat from lstat for 1)\n                        end\n                   from curr_stat\n               where cs.id = curr_stat.id\n             );\n\nselect * from current_stat;\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved I have a table with a status however I want it to change status every 10 minutes. I&#8217;m using Postgresql <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I can see what you&#8217;re after although there is a big omission: What happens when the status has reached &#8216;Z&#8217; and it is time to update? More on that later. Your request has 2 components, actually getting a process to run and a rolling update procedure (script) for the status. Well, Postgres has no &#8230; <a title=\"[Solved] I have a table with a status however I want it to change status every 10 minutes. I&#8217;m using Postgresql\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-i-have-a-table-with-a-status-however-i-want-it-to-change-status-every-10-minutes-im-using-postgresql\/\" aria-label=\"More on [Solved] I have a table with a status however I want it to change status every 10 minutes. I&#8217;m using Postgresql\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[623,349],"class_list":["post-23789","post","type-post","status-publish","format-standard","hentry","category-solved","tag-postgresql","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] I have a table with a status however I want it to change status every 10 minutes. 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