{"id":41649,"date":"2023-11-06T23:15:48","date_gmt":"2023-06-10T13:33:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8r%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e3%80%82\/"},"modified":"2024-05-04T07:51:34","modified_gmt":"2024-05-03T23:51:34","slug":"%e4%bd%bf%e7%94%a8r%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8r%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e3%80%82\/","title":{"rendered":"\u4f7f\u7528R\u8fde\u63a5\u5230PostgreSQL"},"content":{"rendered":"<pre class=\"post-pre\"><code><span class=\"o\">&gt;<\/span> <span class=\"n\">install.packages<\/span><span class=\"p\">(<\/span><span class=\"s1\">'RPostgreSQL'<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">library<\/span><span class=\"p\">(<\/span><span class=\"n\">RPostgreSQL<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">con<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">dbConnect<\/span><span class=\"p\">(<\/span><span class=\"n\">PostgreSQL<\/span><span class=\"p\">(),<\/span> <span class=\"n\">host<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"localhost\"<\/span><span class=\"p\">,<\/span> <span class=\"o\">&gt;<\/span> <span class=\"n\">port<\/span><span class=\"o\">=<\/span><span class=\"m\">5432<\/span><span class=\"p\">,<\/span> <span class=\"n\">user<\/span><span class=\"o\">=<\/span> <span class=\"s2\">\"postgres\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">password<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"*****\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">dbname<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"db_name\"<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">dbListTables<\/span><span class=\"p\">(<\/span><span class=\"n\">con<\/span><span class=\"p\">)<\/span>  <span class=\"c1\"># \u30c6\u30fc\u30d6\u30eb\u4e00\u89a7\u53d6\u5f97<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">dbListFields<\/span><span class=\"p\">(<\/span><span class=\"n\">con<\/span><span class=\"p\">,<\/span> <span class=\"s2\">\"users\"<\/span><span class=\"p\">)<\/span>  <span class=\"c1\"># users\u30c6\u30fc\u30d6\u30eb\u306e\u30ab\u30e9\u30e0\u540d\u4e00\u89a7\u53d6\u5f97<\/span>\r\n<\/code><\/pre>\n<h3>\u6267\u884c\u67e5\u8be2\u5e76\u83b7\u53d6\u6570\u636e\u6846<\/h3>\n<pre class=\"post-pre\"><code><span class=\"o\">&gt;<\/span> <span class=\"n\">con<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">dbConnect<\/span><span class=\"p\">(<\/span><span class=\"n\">PostgreSQL<\/span><span class=\"p\">(),<\/span> <span class=\"n\">host<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"localhost\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">port<\/span><span class=\"o\">=<\/span><span class=\"m\">5432<\/span><span class=\"p\">,<\/span> <span class=\"n\">user<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"aikawa\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">password<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">dbname<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"wantedly\"<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">light_query<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"s2\">\"SELECT * FROM users LIMIT 4\"<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">data<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">dbGetQeury<\/span><span class=\"p\">(<\/span><span class=\"n\">con<\/span><span class=\"p\">,<\/span> <span class=\"n\">light_query<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">heavy_query<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"s2\">\"SELECT * FROM users\"<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">rs<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">dbSendQuery<\/span><span class=\"p\">(<\/span><span class=\"n\">con<\/span><span class=\"p\">,<\/span> <span class=\"n\">heavy_query<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">summary<\/span><span class=\"p\">(<\/span><span class=\"n\">rs<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&lt;<\/span><span class=\"n\">PostgreSQLResult<\/span><span class=\"o\">:<\/span><span class=\"p\">(<\/span><span class=\"m\">10272<\/span><span class=\"p\">,<\/span><span class=\"m\">0<\/span><span class=\"p\">,<\/span><span class=\"m\">11<\/span><span class=\"p\">)<\/span><span class=\"o\">&gt;<\/span> \r\n  <span class=\"n\">Statement<\/span><span class=\"o\">:<\/span> <span class=\"n\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"n\">FROM<\/span> <span class=\"n\">users<\/span> \r\n  <span class=\"n\">Has<\/span> <span class=\"n\">completed<\/span><span class=\"o\">?<\/span> <span class=\"n\">no<\/span> \r\n  <span class=\"n\">Affected<\/span> <span class=\"n\">rows<\/span><span class=\"o\">:<\/span> <span class=\"m\">-1<\/span> \r\n  <span class=\"n\">Rows<\/span> <span class=\"n\">fetched<\/span><span class=\"o\">:<\/span> <span class=\"m\">0<\/span> \r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">data<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">fetch<\/span><span class=\"p\">(<\/span><span class=\"n\">rs<\/span><span class=\"p\">)<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">nrow<\/span><span class=\"p\">(<\/span><span class=\"n\">data<\/span><span class=\"p\">)<\/span>  <span class=\"c1\"># \u5168\u4f53\u306f\u3082\u3063\u3068\u591a\u3044\u306e\u306b500\u884c\u3057\u304b\u53d6\u5f97\u3057\u306a\u3044<\/span>\r\n<span class=\"p\">[<\/span><span class=\"m\">1<\/span><span class=\"p\">]<\/span> <span class=\"m\">500<\/span>\r\n<span class=\"o\">&gt;<\/span>  <span class=\"n\">summary<\/span><span class=\"p\">(<\/span><span class=\"n\">rs<\/span><span class=\"p\">)<\/span>  <span class=\"c1\"># summary\u306frow fetched\u304c500\u306b\u306a\u3063\u3066\u3044\u308b<\/span>\r\n<span class=\"o\">&lt;<\/span><span class=\"n\">PostgreSQLResult<\/span><span class=\"o\">:<\/span><span class=\"p\">(<\/span><span class=\"m\">10272<\/span><span class=\"p\">,<\/span><span class=\"m\">0<\/span><span class=\"p\">,<\/span><span class=\"m\">11<\/span><span class=\"p\">)<\/span><span class=\"o\">&gt;<\/span> \r\n  <span class=\"n\">Statement<\/span><span class=\"o\">:<\/span> <span class=\"n\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"n\">FROM<\/span> <span class=\"n\">users<\/span> \r\n  <span class=\"n\">Has<\/span> <span class=\"n\">completed<\/span><span class=\"o\">?<\/span> <span class=\"n\">no<\/span> \r\n  <span class=\"n\">Affected<\/span> <span class=\"n\">rows<\/span><span class=\"o\">:<\/span> <span class=\"m\">-1<\/span> \r\n  <span class=\"n\">Rows<\/span> <span class=\"n\">fetched<\/span><span class=\"o\">:<\/span> <span class=\"m\">500<\/span> \r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">data<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">fetch<\/span><span class=\"p\">(<\/span><span class=\"n\">rs<\/span><span class=\"p\">)<\/span>  <span class=\"c1\"># \u6b21\u306e500\u4ef6\u3092\u53d6\u5f97<\/span>\r\n<span class=\"o\">&gt;<\/span> <span class=\"n\">data<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">fetch<\/span><span class=\"p\">(<\/span><span class=\"n\">rs<\/span><span class=\"p\">,<\/span> <span class=\"n\">n<\/span><span class=\"o\">=<\/span><span class=\"m\">1000<\/span><span class=\"p\">)<\/span>  <span class=\"c1\"># \u6b21\u306e1000\u4ef6, n=-1\u3067\u5168\u3066\u53d6\u5f97<\/span>\r\n<\/code><\/pre>\n<h3>\u9519\u8bef\u5904\u7406<\/h3>\n<p>\u5f53\u5728`dbSendQuery`\u51fd\u6570\u4e2d\u83b7\u53d6\u7ed3\u679c\u5374\u6ca1\u6709\u5b8c\u5168\u83b7\u53d6(fetch)\u4e4b\u524d\uff08\u5373`dbHasCompleted(rs)`\u4e3aFALSE\u4e4b\u524d\uff09\uff0c\u6267\u884c`dbSendQuery`\u7b49\u67e5\u8be2\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code> <span class=\"n\">Error<\/span> <span class=\"k\">in<\/span> <span class=\"n\">postgresqlExecStatement<\/span><span class=\"p\">(<\/span><span class=\"n\">conn<\/span><span class=\"p\">,<\/span> <span class=\"n\">statement<\/span><span class=\"p\">,<\/span> <span class=\"n\">...<\/span><span class=\"p\">)<\/span> <span class=\"o\">:<\/span> \r\n  <span class=\"n\">RS<\/span><span class=\"o\">-<\/span><span class=\"n\">DBI<\/span> <span class=\"n\">driver<\/span><span class=\"o\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">connection<\/span> <span class=\"n\">with<\/span> <span class=\"n\">pending<\/span> <span class=\"n\">rows<\/span><span class=\"p\">,<\/span> <span class=\"n\">close<\/span> <span class=\"n\">resultSet<\/span> <span class=\"n\">before<\/span> <span class=\"n\">continuing<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u82e5\u51fa\u73b0\u8fd9\u6837\u7684\u60c5\u51b5\uff0c<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">dbClearResult<\/span><span class=\"p\">(<\/span><span class=\"n\">rs<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4e0d\u5c06\u5176\u653e\u5165\u53d8\u91cf\u4e2d\uff0c\u4f8b\u5982rs\u7b49\uff0c\u5219<\/p>\n<p>\u8981\u8ba9\u5176\u5b83\u81ea\u7136\u4e2d\u6587\u7684\u56de\u7b54\uff0c\u5c31\u8bf7\u4f60\u91cd\u65b0\u5411\u6211\u63d0\u95ee\uff01<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">dbClearResult<\/span><span class=\"p\">(<\/span><span class=\"n\">dbListResults<\/span><span class=\"p\">(<\/span><span class=\"n\">con<\/span><span class=\"p\">)[[<\/span><span class=\"m\">1<\/span><span class=\"p\">]])<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8fd9\u6837\u7684\u8bdd\uff0c\u60a8\u5c06\u80fd\u591f\u91cd\u65b0\u6267\u884c\u67e5\u8be2\u3002<\/p>\n<h2>\u5f15\u7528<\/h2>\n","protected":false},"excerpt":{"rendered":"<p>&gt; install.packages(&#8216;RPostgreSQL&#8217;) &gt; library(RPost [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41649","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4f7f\u7528R\u8fde\u63a5\u5230PostgreSQL - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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