{"id":927,"date":"2010-06-29T01:00:00","date_gmt":"2010-06-28T16:00:00","guid":{"rendered":"https:\/\/ecoop.net\/memo\/2010-06-29-1.html"},"modified":"2017-04-20T18:01:12","modified_gmt":"2017-04-20T09:01:12","slug":"2010-06-29-1","status":"publish","type":"post","link":"https:\/\/www.ecoop.net\/memo\/archives\/2010-06-29-1.html","title":{"rendered":"PostgreSQL \u3067 to_dec"},"content":{"rendered":"

\nto_hex() \u306e\u9006\u95a2\u6570\u306f\u6a19\u6e96\u3067\u306f\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002
\nPL\/pgSQL \u304c\u4f7f\u3048\u308b\u74b0\u5883\u3067\u3042\u308c\u3070\u300cConversion between hex and dec numbers(16\u9032\u6570\u306810\u9032\u6570\u306e\u5909\u63db)<\/a>\u300d(SQL Tricks)\u306e\u30da\u30fc\u30b8\u3067\u5b9a\u7fa9\u3057\u3066\u3044\u308b to_dec() \u95a2\u6570\u3092\u4f7f\u3046\u306e\u304c\u4fbf\u5229\u3067\u3059\u3002<\/p>\n

=# select to_hex(11);
\n    to_hex
\n   ——–
\n    b
\n   (1 row)
\npostgres=# create or replace function to_dec(text)
\n           returns integer as $$
\n           declare r int;
\n           begin
\n             execute E’select ”||$1|| E’\\’::integer’ into r;
\n             return r;
\n           end
\n           $$ language plpgsql;
\nCREATE FUNCTION
\npostgres=# select to_dec(‘ff’);
\n to_dec <\/p>\n

\n

—-
\n    255
\n(1 row)\n<\/p><\/blockquote>\n

 
\n\u5225\u306e\u65b9\u6cd5\u3068\u3057\u3066\u300116\u9032\u6570\u30921\u5ea6\u30d3\u30c3\u30c8\u578b\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u3067\u308210\u9032\u6570\u306b\u5909\u63db\u3067\u304d\u307e\u3059(\u6841\u6570\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u306e\u307f)\u3002
\n\u305f\u3068\u3048\u3070\u30012\u6841\u306e16\u9032\u6570\u6587\u5b57\u5217 \u306e hextext \u3068\u3044\u3046\u30ab\u30e9\u30e0\u309210\u9032\u6570\u306b\u5909\u63db\u3057\u305f\u5c45\u5834\u5408\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\n<\/p>\n

SELECT (‘x’ || hextext)::bit(8)::integer — bit(\u6841\u6570\u306e4\u500d)\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

to_hex() \u306e\u9006\u95a2\u6570\u306f\u6a19\u6e96\u3067\u306f\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002 PL\/pgSQL \u304c\u4f7f\u3048\u308b\u74b0\u5883\u3067\u3042\u308c\u3070\u300cConversion between hex and dec numbers(16\u9032\u6570\u306810\u9032\u6570\u306e\u5909\u63db)\u300d(SQL Tri … \u7d9a\u304d\u3092\u8aad\u3080 PostgreSQL \u3067 to_dec<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89],"tags":[45],"class_list":["post-927","post","type-post","status-publish","format-standard","hentry","category-web-dev","tag-postgresql"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/927","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/comments?post=927"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/927\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/media?parent=927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/categories?post=927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/tags?post=927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}