{"id":512,"date":"2019-08-09T13:09:37","date_gmt":"2019-08-09T05:09:37","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=512"},"modified":"2019-11-25T11:46:14","modified_gmt":"2019-11-25T03:46:14","slug":"512","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=512","title":{"rendered":"get_json_object\u51fd\u6570\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<h3>\u6982\u8981\u63cf\u8ff0<\/h3>\n<p>inceptor \u4e2d\u9488\u5bf9json \u683c\u5f0f\u6570\u636e\u5bf9\u8c61\uff0c\u5e0c\u671b\u83b7\u53d6\u6307\u5b9a\u4f4d\u7f6e\u7684\u5bf9\u8c61\u65f6\u4f7f\u7528\u7684\u51fd\u6570\uff0c\u63d0\u4f9b\u4e86\u4e24\u79cd\u7528\u6cd5\uff1a<\/p>\n<ul>\n<li>get_json_object() \uff1a\u4ece\u6307\u5b9a\u5730\u5740\u83b7\u53d6json\u5bf9\u8c61\u3002<\/li>\n<li>json_tuple()\uff1a\u7528 json \u4e2d\u7684\u5143\u7ec4\u751f\u6210\u8868\uff0c\u8fd4\u56de\u503c\u7684tuple\u3002\u8fd9\u662f &#8216;get_json_object&#8217; \u7684\u9ad8\u6548\u7248\u3002<\/li>\n<\/ul>\n<h3>\u4f7f\u7528\u8bf4\u660e<\/h3>\n<p>get_json_object\uff1a\u4ece\u6307\u5b9a\u4f4d\u7f6e\u83b7\u53d6json\u5bf9\u8c61\u3002get_json_object(string json_string, string path)<br \/>\n\u6b64\u51fd\u6570\u9700\u8981\u4f20\u9012\u4e24\u4e2a\u53c2\u6570\uff1a<br \/>\n\u7b2c\u4e00\u4e2a\u53c2\u6570\u586b\u5199json\u5bf9\u8c61\u53d8\u91cf\uff0c<br \/>\n\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f7f\u7528$\u8868\u793ajson\u53d8\u91cf\u6807\u8bc6\uff0c\u7136\u540e\u7528 . \u6216 [] \u8bfb\u53d6\u5bf9\u8c61\u6216\u6570\u7ec4\uff1b<br \/>\n\u6bcf\u6b21\u53ea\u80fd\u8fd4\u56de\u4e00\u4e2a\u6570\u636e\u9879\uff0c\u5982\u679c\u8f93\u5165\u7684json\u5b57\u7b26\u4e32\u65e0\u6548\uff0c\u90a3\u4e48\u8fd4\u56deNULL\u3002<\/p>\n<p>json_tuple()\uff1a\u7528 json \u4e2d\u7684\u5143\u7ec4\u751f\u6210\u8868\uff0c\u8fd4\u56de\u503c\u7684tuple\u3002\u8fd9\u662f &#8216;get_json_object&#8217; \u7684\u9ad8\u6548\u7248\u3002<br \/>\n\u53c2\u6570\u548c get_json_object \u53c2\u6570\u7c7b\u4f3c\uff0cstring path \u53ef\u4ee5\u4e3a\u591a\u4e2a\u3002<\/p>\n<h4>\u6570\u636e\u6587\u4ef6<\/h4>\n<pre><code class=\"language-json\">datat.txt\n\n{\"\u65f6\u95f4\u70b9\":\"20160402\"},{\"id\":\"1\"},{\"name\":\"tianna\"}<\/code><\/pre>\n<h4>\u5c06\u6570\u636e\u6587\u4ef6\u4e0a\u4f20\u5230hdfs<\/h4>\n<pre><code class=\"language-sql\">hdfs dfs -mkdir \/inceptor1\/data1\/datat\nhdfs dfs -put datat.txt \/inceptor1\/data1\/datat<\/code><\/pre>\n<h4>\u5efa\u8868<\/h4>\n<pre><code class=\"language-sql\">CREATE EXTERNAL TABLE jsontest( \n timestamp string DEFAULT NULL, \n id string DEFAULT NULL, \n name string DEFAULT NULL\n ) \n ROW FORMAT SERDE \n 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'\n WITH SERDEPROPERTIES ( \n 'field.delim'=','\n) \n STORED AS INPUTFORMAT \n 'org.apache.hadoop.mapred.TextInputFormat'\n OUTPUTFORMAT \n 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'\n LOCATION \n 'hdfs:\/inceptor1\/data1\/datat'\n TBLPROPERTIES ( \n 'transient_lastDdlTime'='1529027504');<\/code><\/pre>\n<h4>\u4f7f\u7528\u51fd\u6570\u67e5\u8be2id\u5b57\u6bb5<\/h4>\n<p><code>select get_json_object(jsontest.id,&#039;$.id&#039;)  from jsontest;<\/code><br \/>\n\u8bf4\u660e\uff1a<br \/>\n\u7b2c\u4e00\u4e2a\u53c2\u6570jsontest.id\uff0cjson\u5bf9\u8c61\uff1b<br \/>\n\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f7f\u7528$\u8868\u793ajson\u53d8\u91cf\u6807\u8bc6\uff0c\u7136\u540e\u7528 . \u6216 [] \u8bfb\u53d6\u5bf9\u8c61\u6216\u6570\u7ec4\uff1b<\/p>\n<h4>\u8f93\u51fa\u7ed3\u679c<\/h4>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2019\/08\/image-1565327032835.png\" alt=\"file\" \/><\/p>\n<h4>\u5b57\u6bb5\u503c(value)\u652f\u6301\u4e2d\u6587<\/h4>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2019\/08\/image-1565327063872.png\" alt=\"file\" \/><\/p>\n<h4>json_tuple \u51fd\u6570<\/h4>\n<h4>\u51fd\u6570\u7684\u4f5c\u7528\uff1a\u7528\u6765\u89e3\u6790json\u5b57\u7b26\u4e32\u4e2d\u7684\u591a\u4e2a\u5b57\u6bb5<\/h4>\n<pre><code class=\"language-sql\">set character.literal.as.string=true;  \n--\u5411\u8be5\u51fd\u6570\u4f20\u9012\u7684\u5b57\u7b26\u4e32\u8981\u6c42\u5fc5\u987b\u662fSTRING\u7c7b\u578b\uff0c\u4e3a\u9632\u6b62\u7cfb\u7edf\u5c06\u4f20\u9012\u7684\u5b57\u7b26\u4e32\u53c2\u6570\u8bc6\u522b\u4e3aCHAR\u578b\uff0c\u5fc5\u987b\u8981\u6253\u5f00\u5f00\u5173character.literal.as.string\uff0c\u5f3a\u5236\u5c06\u5b57\u7b26\u4e32\u8bc6\u522b\u4e3aSTRING\u7c7b\u578b\nSELECT json_tuple('{\"firstName\":\"Brett\",\"lastName\":\"McLaughlin\",\"email\":\"aaaa\"}', 'firstName',\n'email') FROM system.dual;<\/code><\/pre>\n<p><strong>\u6ce8\uff1a\u4e24\u4e2a\u51fd\u6570\u90fd\u4e0d\u652f\u6301 key \u503c\u4e3a\u4e2d\u6587\uff0c\u4f46\u662f\u90fd\u652f\u6301 value \u4e3a\u4e2d\u6587<\/strong><\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2019\/08\/image-1565327230266.png\" alt=\"file\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981\u63cf\u8ff0 inceptor \u4e2d\u9488\u5bf9json \u683c\u5f0f\u6570\u636e\u5bf9\u8c61\uff0c\u5e0c\u671b\u83b7\u53d6\u6307\u5b9a\u4f4d\u7f6e\u7684\u5bf9\u8c61\u65f6\u4f7f\u7528\u7684\u51fd\u6570\uff0c\u63d0\u4f9b\u4e86\u4e24\u79cd\u7528\u6cd5\uff1a ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/kbwp.transwarp.cn\/?p=512\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-512","post","type-post","status-publish","format-standard","hentry","category-configuration"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/512","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=512"}],"version-history":[{"count":0,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/512\/revisions"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}