{"id":66,"date":"2014-08-24T00:22:09","date_gmt":"2014-08-23T16:22:09","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=66"},"modified":"2014-08-24T00:22:09","modified_gmt":"2014-08-23T16:22:09","slug":"postgresql-%e5%8d%81%e5%85%ad%e8%bf%9b%e5%88%b6%e8%bd%ac%e4%b8%ba%e6%95%b4%e6%95%b0%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=66","title":{"rendered":"PostgreSQL \u5341\u516d\u8fdb\u5236\u8f6c\u4e3a\u6574\u6570\u51fd\u6570"},"content":{"rendered":"<p><span style=\"color: #454545;\">PostgreSQL\u6709\u6574\u6570\u8f6c\u4e3a\u5b57\u7b26\u4e32\u7684\u51fd\u6570to_hex\uff0c\u4f46\u5374\u6ca1\u6709\u63d0\u4f9b\u53cd\u8fc7\u6765\u7684\u51fd\u6570\uff0c\u56e0\u4e3a\u8981\u7528\u5230\uff0c\u5199\u4e86\u4e00\u4e2a\u4e0e\u5927\u5bb6\u5206\u4eab\u3002<\/span><\/p>\n<pre class=\"theme:vs2012 lang:pgsql decode:true \">create or replace function hex_to_int(s character varying)\r\nreturns bigint\r\nas\r\n$$\r\ndeclare\r\n  retval bigint;\r\n  lead character varying;\r\nbegin\r\nlead=left(s,1);\r\nif (lead='$') or (lead='h') or (lead='H') then\r\n  lead=right(s,length(s)-1);\r\nelse\r\n  begin\r\n  lead=left(s,2);\r\n  if (lead='0x') or (lead='0X') then\r\n    lead=right(s,length(s)-2);\r\n  else\r\n    raise exception '% \u4e0d\u662f\u4e00\u4e2a\u6709\u6548\u7684\u5341\u516d\u8fdb\u5236\u6570',s;\r\n  end if;\r\n  end;\r\nend if;\r\ns='x'||repeat('0',16-length(lead))||lead;\r\n--raise notice 'hexchars=%',s;\r\nretval=cast(cast(s as bit(64)) as bigint);\r\nreturn retval;\r\nend;\r\n$$ language plpgsql immutable strict;<\/pre>\n<p>\u8c03\u7528\u65f6\uff0c\u53ea\u9700\u8981\u7b80\u5355\u7684\u5c06\u5176\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\uff0c\u6216\u8005\u5982select hex_to_int(&#8216;0x0220&#8217;);\u8fd9\u6837\u5b50\u8c03\u7528\u4e00\u4e0b\u5c31\u53ef\u4ee5\u3002<\/p>\n<p style=\"color: #454545;\">\u00a0 \u00a0 \u8fd9\u4e2a\u51fd\u6570\u652f\u6301Delphi\/C++\/Basic\u7684\u5341\u516d\u8fdb\u5236\u8868\u793a\u65b9\u5f0f\u3002<\/p>\n<p style=\"color: #454545;\">\n<pre class=\"lang:mysql decode:true \">select hex_to_int('0x0100');\r\nselect hex_to_int('$0100');\r\nselect hex_to_int('H0100');<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL\u6709\u6574\u6570\u8f6c\u4e3a\u5b57\u7b26\u4e32\u7684\u51fd [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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