{"id":4458,"date":"2023-03-30T16:48:39","date_gmt":"2023-03-30T08:48:39","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=4458"},"modified":"2023-03-30T16:48:38","modified_gmt":"2023-03-30T08:48:38","slug":"orc%e8%a1%a8%e6%88%96torc%e8%a1%a8%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e7%b1%bb%e5%9e%8b%e7%9a%84%e6%8e%92%e6%9f%a5%e6%96%b9%e6%b3%95%e4%bb%a5%e5%8f%8a%e8%a7%a3%e5%86%b3%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=4458","title":{"rendered":"ORC\u8868\u6216TORC\u8868\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\u7684\u6392\u67e5\u65b9\u6cd5\u4ee5\u53ca\u89e3\u51b3\u65b9\u6848"},"content":{"rendered":"<h3>\u6982\u8981\u63cf\u8ff0<\/h3>\n<p>\u672c\u6587\u63cf\u8ff0TDH521\u4e4b\u524d\u65e9\u671f\u7248\u672c\u6ca1\u6709\u7981\u6b62orc\u8868torc\u8868\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\u65f6\u5e26\u6765\u7684\u95ee\u9898\u4ee5\u53ca\u89e3\u51b3\u65b9\u6848\u3002<br \/>\n\u672c\u6587\u4ee5TDH512\u4e3a\u4f8b\uff0c\u63cf\u8ff0\u51fa\u73b0\u8be5\u573a\u666f\u7684\u89e3\u51b3\u65b9\u6cd5<\/p>\n<h3>\u8be6\u7ec6\u63cf\u8ff0<\/h3>\n<h4>1 \u539f\u7406\u4ecb\u7ecd<\/h4>\n<p>\u5bf9ORC\u7c7b\u578b\u7684\u5b58\u50a8\uff0c\u76ee\u524dInceptor\u4e2d\u6ca1\u6709\u5f88\u597d\u7684\u652f\u6301\u7c7b\u578b\u95f4\u7684\u8f6c\u6362\u3002\u8fd9\u662f\u56e0\u4e3aORC\u683c\u5f0f\u662f\u4e00\u79cdself-description\u7684\u5b58\u50a8\u683c\u5f0f\uff0c\u5728\u5199\u5165ORC\u6587\u4ef6\u65f6\uff0c\u4f1a\u5c06\u5b57\u6bb5\u7c7b\u578b\u4e00\u5e76\u5199\u5165\u6587\u4ef6\u3002\u5f53\u8bfb\u8be5ORC\u6587\u4ef6\u65f6\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u6587\u4ef6\u4e2d\u7684\u7c7b\u578b\uff0c\u76f4\u63a5\u6062\u590d\u51fa\u5b58\u50a8\u7684\u6570\u636e\u3002<\/p>\n<p>\u5982\u679c\u4fee\u6539ORC\u8868\u6216ORC\u4e8b\u52a1\u8868\u5b57\u6bb5\u7c7b\u578b\uff0c\u90a3\u4e48\u4f1a\u5b58\u5728\u95ee\u9898\uff1a\u5728\u4fee\u6539\u5b57\u6bb5\u4e4b\u524d\u5b58\u50a8\u7684\u6570\u636e\uff0c\u4f1a\u6309\u7167ORC\u4e2d\u62a5\u9519\u7684\u7c7b\u578b\u89e3\u6790\u5e76\u751f\u6210struct\u3002\u4f46\u7531\u4e8e\u8be5\u5b57\u6bb5\u88ab\u4fee\u6539\u4e86\uff0c\u6240\u4ee5\u6700\u7ec8\u5728Inceptor\u4f1a\u6309\u7167\u65b0\u7684\u7c7b\u578b\u6765\u89e3\u91ca\u8be5\u503c\uff0c\u8fd9\u671f\u95f4\u4f1a\u5f3a\u5236\u5c06\u65e7\u7684\u7c7b\u578b\u8f6c\u6362\u65b0\u7c7b\u578b\uff0c\u9020\u6210ClassCastException<\/p>\n<h4>2 TDH521\u4e4b\u540e\uff0c\u8be5\u529f\u80fd\u5df2\u7ecf\u88ab\u5173\u95ed\u3002<\/h4>\n<p>TDH521\u4e4b\u540e\uff0c\u5982\u679c\u5c1d\u8bd5\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\u4f1a\u51fa\u73b0\u63d0\u793a\u62a5\u9519\uff0c\u4e14\u8bed\u53e5\u65e0\u6cd5\u6267\u884c\u3002<br \/>\n\u62a5\u9519\u5185\u5bb9\u5982\u4e0b\uff1a<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604648210930.png\" alt=\"file\" \/><\/p>\n<h4>3 \u590d\u73b0\u95ee\u9898\u573a\u666f<\/h4>\n<h5>orc\u4e8b\u52a1\u8868\u590d\u73b0\u8bed\u53e5<\/h5>\n<pre><code class=\"language-sql\">CREATE TABLE info (id int ,name string ,age int)\nclustered BY (id) INTO 3 buckets stored AS orc_transaction;\n\nINSERT INTO info values(1,'\u674e\u73b0',22);\nINSERT INTO info values(2,'\u9648\u4f1f\u9706',28);\nINSERT INTO info values(3,'\u6731\u4e00\u9f99',30);\nINSERT INTO info values(4,'\u8bb8\u5149\u6c49',24);\nINSERT INTO info values(5,'\u5468\u6770\u4f26',39);\nINSERT INTO info values(6,'\u6728\u6751\u62d3\u54c9',45);\n\nALTER TABLE info change name name char(20);\n<\/code><\/pre>\n<p>\u6b64\u65f6\u67e5\u8be2\u8be5\u8868\uff0c\u53ea\u8981\u6d89\u53ca\u88ab\u4fee\u6539\u7684\u5b57\u6bb5<\/p>\n<pre><code class=\"language-sql\">select * from info;<\/code><\/pre>\n<p>\u4f1a\u51fa\u73b0\u7c7b\u4f3c\u5982\u4e0b\u62a5\u9519\uff1a<br \/>\norg.apache.hadoop.hive.sql.metadata.HiveException:org.apache.hadoop.io.Text cannot be cast to org.apache.hadoop.hive.serde2.io.HiveCharWritable<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604648790140.png\" alt=\"file\" \/><\/p>\n<h5>orc\u8868\u590d\u73b0\u8bed\u53e5<\/h5>\n<pre><code class=\"language-sql\">create table info_orc(id int, name STRING,age int) stored as orc; \n\ninsert into info_orc select 1,'\u674e\u73b0',22 from system.dual;\ninsert into info_orc select 2,'\u9648\u4f1f\u9706',28 from system.dual;\ninsert into info_orc select 3,'\u6731\u4e00\u9f99',30 from system.dual;\ninsert into info_orc select 4,'\u8bb8\u5149\u6c49',24 from system.dual;\ninsert into info_orc select 5,'\u5468\u6770\u4f26',39 from system.dual;\ninsert into info_orc select 6,'\u6728\u6751\u62d3\u54c9',45 from system.dual;\nalter table info_orc change name name char(20);<\/code><\/pre>\n<p>\u95ee\u9898\u573a\u666f\u548corc\u4e8b\u52a1\u8868\u76f8\u4f3c<\/p>\n<h4>4 \u95ee\u9898\u5f71\u54cd<\/h4>\n<h5>\u626b\u63cf\u8868\u7684\u76f8\u5173\u64cd\u4f5c\u90fd\u4f1a\u624b\u52a8\u5f71\u54cd\uff0c\u5982\u679c\u8bfb\u5230\u4e86\u8be5ORC\u6587\u4ef6\u4e2d\u7684\u5bf9\u5e94\u5b57\u6bb5\uff0c\u5c31\u4f1a\u629b\u5f02\u5e38\u3002\u4f46\u662f\u6b64\u65f6insert\u7b49\u64cd\u4f5c\u4e0d\u6d89\u53ca\u5168\u8868\u626b\u63cf\u7684\uff0c\u4ecd\u7136\u662f\u53ef\u4ee5\u8fdb\u884c\u7684\u3002<\/h5>\n<h5>compaction\u7684\u64cd\u4f5c\u4f1a\u626b\u63cf\u5168\u8868\uff0c\u4f1a\u5bfc\u81f4ORC\u4e8b\u52a1\u8868\u7684compaction\u5931\u8d25<\/h5>\n<h4>5 \u95ee\u9898\u6392\u67e5<\/h4>\n<p>\u4e3b\u8981\u662f\u627e\u5230ORC\u6587\u4ef6\u4e2d\u5b57\u6bb5\u7c7b\u578b\u4e0emetastore\u4e2d\u7c7b\u578b\u4e0d\u5339\u914d\u7684\u5730\u65b9<\/p>\n<h5>1 \u67e5\u770b\u8868\u7684\u5f53\u524d\u5b57\u6bb5\u7c7b\u578b<\/h5>\n<pre><code class=\"language-sql\">desc info;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604649220425.png\" alt=\"file\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u5f53\u524d\u4e00\u5171\u4e09\u4e2a\u5b57\u6bb5\u7684\u8bb0\u5f55\uff0c\u5206\u522b\u662f\uff1a<br \/>\nid \u5bf9\u5e94 int\u7c7b\u578b<br \/>\nname \u5bf9\u5e94 char\uff0820\uff09\u7c7b\u578b<br \/>\nage \u5bf9\u5e94 int\u7c7b\u578b<\/p>\n<h5>2 \u4f7f\u7528orcfiledump\u5de5\u5177\uff0c\u67e5\u770borc\u6587\u4ef6\u4e2d\u7684\u7c7b\u578b<\/h5>\n<p>orcfiledump\u5de5\u5177\u53ef\u4ee5\u67e5\u770b\u67d0\u4e2aORC\u6587\u4ef6\uff08\u6ce8\u610f\u662f\u6587\u4ef6\u800c\u4e0d\u662f\u76ee\u5f55\uff09\u5e95\u5c42\u5b58\u50a8\u4fe1\u606f\uff0c\u5176\u4e2d\u5c31\u5305\u62ec\u4e86\u5b57\u6bb5\u7c7b\u578b\u4fe1\u606f<br \/>\n\uff08\u4ee5\u4e0b\u547d\u540d\u9700\u8981\u8bbf\u95eehdfs\u6587\u4ef6\uff0c\u9700\u8981\u6709\u6743\u9650\u7684\u7528\u6237\u624d\u53ef\u4ee5\u64cd\u4f5c\uff09<\/p>\n<h6>1 4.x\u7248\u672c\u4f7f\u7528orcfiledump<\/h6>\n<pre><code class=\"language-shell\">\/usr\/lib\/hive\/bin\/hive --service orcfiledump hdfs:\/\/xxx<\/code><\/pre>\n<h6>2 5.x \u7248\u672c\u4f7f\u7528orcfiledump<\/h6>\n<pre><code class=\"language-shell\">TDH-Client\/inceptor\/bin\/hive --service orcfiledump hdfs:\/\/xxx<\/code><\/pre>\n<p>\u4ee5info\u8fd9\u5f20ORC\u4e8b\u52a1\u8868\u4e3a\u4f8b\uff0c\u8fdb\u884c\u67e5\u8be2<\/p>\n<pre><code class=\"language-sql\">show create table info;<\/code><\/pre>\n<p>\u627e\u5230\u8be5\u8868\u5728hdfs\u4e0a\u5bf9\u5e94\u7684location<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604649576577.png\" alt=\"file\" \/><\/p>\n<p>hdfs\u4e0a\u627e\u5230\u5bf9\u5e94\u7684location\u4e0b\u7684\u6587\u4ef6\u4fe1\u606f\uff0c\u5728hdfs\u4e0a\u627e\u5230\u76f8\u5e94\u7684\u5e95\u5c42\u5b58\u50a8\u7684\u6587\u4ef6\uff08\u800c\u4e0d\u662f\u6587\u4ef6\u5939\uff09\uff0c\u4efb\u9009\u5176\u4e2d\u7684\u4e00\u4e2a\u6587\u4ef6<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604649742790.png\" alt=\"file\" \/><br \/>\n\u4f7f\u7528orcfiledump\u67e5\u770b\u5e95\u5c42\u5b58\u50a8\u4fe1\u606f<\/p>\n<pre><code class=\"language-shell\">\/root\/TDH-Client\/inceptor\/bin\/hive --service orcfiledump \/inceptor1\/user\/hive\/warehouse\/xiannv.db\/hive\/info\/delta_0000016_0000016\/bucket_00001<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604649901659.png\" alt=\"file\" \/><\/p>\n<p>\u5173\u6ce8type\u8fd9\u4e00\u884c\u7684\u663e\u793a\u4fe1\u606f\uff0c\u4e8b\u52a1\u8868Type\u5bf9\u5e94\u884c\u4e2drow: struct&lt;&gt;\u5185\u7684\u5b57\u6bb5\u540d\u548c\u7c7b\u578b\u5373\u5bf9\u5e94\u8868\u7684\u5b57\u6bb5\u540d\u548c\u7c7b\u578b(\u540c\u4e00base\u6216delta\u76ee\u5f55\u4e0b\uff0c\u6240\u6709buckets\u5185\u7684\u7c7b\u578b\u80af\u5b9a\u4e00\u81f4)<\/p>\n<p>ORC\u8868\u7684orcfiledump\u51fa\u6765\u5982\u4e0b<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604651329106.png\" alt=\"file\" \/><\/p>\n<h4>6 \u6570\u636e\u6062\u590d<\/h4>\n<p>\u6309\u7167\u4e4b\u524d\u7684\u5c1d\u8bd5\uff0c\u6d89\u53ca\u5168\u8868\u626b\u63cf\u7684\u64cd\u4f5c\u90fd\u4f1a\u6709\u62a5\u9519\u3002\u5982\u679c\u9700\u8981\u6062\u590d\u6570\u636e\uff0c\u5c31\u5fc5\u987b\u8ba9ORC\u6587\u4ef6\u4e2d\u7684\u7c7b\u578b\u548cmetastore\u4e2d\u7684\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n<h5>\u666e\u901aORC\u8868<\/h5>\n<p>\u56e0\u4e3a\u666e\u901aORC\u8868\u6ca1\u6709CRUD\u64cd\u4f5c\uff0c\u6240\u4ee5\u6240\u6709\u7684\u6587\u4ef6\u90fd\u662fappend\u64cd\u4f5c\uff0c\u56e0\u6b64\uff0c\u53ea\u8981\u6309\u7c7b\u578b\u5206\u6279\u5bfc\u51fa\u5373\u53ef\u3002<\/p>\n<h6>\u4e3a\u4ec0\u4e48\u8bf4\u8981\u5206\u6279<\/h6>\n<p>\u662f\u7531\u4e8e\u4fee\u6539\u4e86\u5b57\u6bb5\u7c7b\u578b\u4e4b\u540e\uff0c\u867d\u7136\u4e0d\u80fd\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff0c\u4f46\u662finsert\u7b49\u4e0d\u6d89\u53ca\u5168\u8868\u626b\u63cf\u7684\u64cd\u4f5c\u4ecd\u7136\u662f\u53ef\u4ee5\u8fdb\u884c\u7684\u3002<br \/>\n\u6240\u4ee5\u4ee5\u4e0a\u8ff0ORC\u8868\u4e3a\u4f8b\uff0c\u6b64\u65f6\u63d2\u5165\u4e00\u6761<\/p>\n<pre><code class=\"language-sql\">INSERT INTO info_orc SELECT 7,'\u5cb3\u4e91\u9e4f',32 from system.dual;<\/code><\/pre>\n<p>\u53ef\u4ee5\u67e5\u770b\u5230orc\u6587\u4ef6\u4e2d\u7684\u5b58\u50a8\u7c7b\u578b\u5982\u4e0b<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604652255336.png\" alt=\"file\" \/><br \/>\n\u53ca\uff0c\u8be5\u8868\u7684location\u4e0b\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4e0d\u4ec5\u6709id int,name string,age int \u7c7b\u578b\u7684\u5b58\u50a8\u6587\u4ef6\uff0c\u8fd8\u6709id int,name char(20),age int\u7c7b\u578b\u7684\u5b58\u50a8\u6587\u4ef6<\/p>\n<h6>\u5bfc\u51fa\u7684\u6b65\u9aa4<\/h6>\n<p>\u521b\u5efa\u4e00\u4e2a\u76ee\u6807\u8868\uff0c\u5339\u914d\u4fee\u6539\u540e\u7684\u8868\u7684\u7c7b\u578b\uff0c\u6bd4\u5982\uff1a<\/p>\n<pre><code class=\"language-sql\">CREATE TABLE info_orc_t (id int, name CHAR(20),age int) stored as orc;<\/code><\/pre>\n<p>\u5c06orc\u6587\u4ef6\u5b58\u50a8\u7c7b\u578b\u4e3aid int\uff0cname char(20),age int\u7684\u6587\u4ef6\u5bfc\u51fa\u5230\u65b0\u5efa\u8868\u7684hdfs\u7684location\u4e0a<\/p>\n<pre><code class=\"language-shell\">hadoop dfs -mv \/inceptor1\/user\/hive\/warehouse\/xiannv.db\/hive\/info_orc\/000000_0_copy_6 \/inceptor1\/user\/hive\/warehouse\/xiannv.db\/hive\/info_orc_t<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604653176057.png\" alt=\"file\" \/><br \/>\n\u5176\u4ed6\u53ea\u5269\u4e0b\u5b58\u50a8\u7c7b\u578b\u4e3aid int\uff0cname string\uff0cage int\u7684\u6570\u636e\u4e86\u3002\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff0c\u4ecechar\uff0820\uff09\u6539\u4e3astring<\/p>\n<pre><code class=\"language-sql\">ALTER TABLE info_orc CHANGE name name STRING;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604653284616.png\" alt=\"file\" \/><\/p>\n<p>\u5c06\u6570\u636e\u5e76\u5165\u65b0\u8868info_orc_t\u4e2d<\/p>\n<pre><code class=\"language-sql\">INSERT INTO info_orc_t SELECT * FROM info_orc;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604653363292.png\" alt=\"file\" \/><\/p>\n<p>\u6700\u7ec8\u4f7f\u5f97\u65b0\u8868\u4e2d\u5bfc\u5165\u4e86\u6240\u6709\u7684\u6570\u636e\uff0c\u4e14\u5b57\u6bb5\u7c7b\u578b\u4e3achar(20)<br \/>\n\u6709\u5fc5\u8981\u7684\u8bdd\uff0cdrop\u539f\u59cb\u8868\uff0c\u5e76rename\u4e34\u65f6\u8868\u4e3a\u539f\u59cb\u8868\uff0c\u6062\u590d\u539f\u59cb\u8868\u6570\u636e\u8bbf\u95ee<\/p>\n<h5>ORC\u4e8b\u52a1\u8868<\/h5>\n<p>\u5982\u679cORC\u4e8b\u52a1\u8868\u4fee\u6539\u4e86\u7c7b\u578b\uff0c\u4f46\u6ca1\u6709\u505a\u4efb\u4f55CRUD\u64cd\u4f5c\uff0c\u53ef\u4ee5\u76f4\u63a5\u5c06\u8be5\u5b57\u6bb5\u6062\u590d\u4e3a\u4fee\u6539\u524d\u7c7b\u578b\u3002<br \/>\n\u5982\u679cORC\u4e8b\u52a1\u8868\u6539\u4e86\u7c7b\u578b\uff0c\u5e76\u4e14\u5728\u4fee\u6539\u4e4b\u540e\u8fd8\u6709\u65b0\u7684delta\u751f\u6210\uff0c\u90a3\u4e8b\u60c5\u4f1a\u975e\u5e38\u9ebb\u70e6\u3002<\/p>\n<h6>\u4fee\u6539\u5b57\u6bb5\u540e\uff0c\u65b0\u589edelta\u662f\u7531insert\u5f15\u8d77\u7684<\/h6>\n<p>\u6bd4\u5982\u7ea2\u6846\u90e8\u5206<br \/>\n<img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604654198782.png\" alt=\"file\" \/><\/p>\n<p>1 hdfs\u548ctxsql\u91cc\u90fd\u5907\u4efd\u8be5\u8868\u7684\u6570\u636e<br \/>\n2 \u505c\u6b62\u5f53\u524d\u7cfb\u7edf\u5bf9\u8be5ORC\u4e8b\u52a1\u8868\u7684\u4efb\u4f55\u64cd\u4f5c\uff0c\u5e76\u5c06\u7981\u6389\u8be5\u8868\u7684comapction<\/p>\n<pre><code class=\"language-sql\">alter table info disable compact\uff1b<\/code><\/pre>\n<p>\u6309\u7167\u7c7b\u4f3c\u666e\u901aORC\u8868\u64cd\u4f5c\u65b9\u5f0f\uff0c\u65b0\u5efa\u4e34\u65f6\u8868\uff0c\u539f\u59cb\u8868\u6bcf\u6b21\u4fdd\u7559\u5b57\u6bb5\u7c7b\u578b\u76f8\u540c\u7684base\u6216delta\uff0c\u5206\u6279\u5bfc\u5165\u4e34\u65f6\u8868<\/p>\n<pre><code class=\"language-sql\">CREATE TABLE info_t (id int ,name char(20) ,age int)\nclustered BY (id) INTO 3 buckets stored AS orc_transaction;<\/code><\/pre>\n<pre><code class=\"language-shell\">hadoop dfs -mv \/inceptor1\/user\/hive\/warehouse\/xiannv.db\/hive\/info\/delta_0000029_0000029 \/inceptor1\/user\/hive\/warehouse\/xiannv.db\/hive\/info_t<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604654798594.png\" alt=\"file\" \/><\/p>\n<p>\u5176\u4ed6\u53ea\u5269\u4e0b\u5b58\u50a8\u7c7b\u578b\u4e3aid int\uff0cname string\uff0cage int\u7684\u6570\u636e\u4e86\u3002\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff0c\u4ecechar\uff0820\uff09\u6539\u4e3astring<\/p>\n<pre><code class=\"language-sql\">ALTER TABLE info CHANGE name name STRING;<\/code><\/pre>\n<p>\u5c06\u6570\u636e\u5e76\u5165\u65b0\u8868info_orc_t\u4e2d<\/p>\n<pre><code class=\"language-sql\">INSERT INTO info_t SELECT * FROM info;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/nj.transwarp.cn:8180\/wp-content\/uploads\/2020\/11\/image-1604654736773.png\" alt=\"file\" \/><\/p>\n<h6>\u5982\u679c\u4fee\u6539\u5b57\u6bb5\u540e\uff0c\u65b0\u589edelta\u662fupdate\/delete\u6216merge into\u5f15\u5165\uff0c\u76ee\u524d\u6ca1\u6709\u597d\u7684\u529e\u6cd5\u6062\u590d\u6570\u636e\u3002<\/h6>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981\u63cf\u8ff0 \u672c\u6587\u63cf\u8ff0TDH521\u4e4b\u524d\u65e9\u671f\u7248\u672c\u6ca1\u6709\u7981\u6b62orc\u8868torc\u8868\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\u65f6\u5e26\u6765\u7684\u95ee\u9898\u4ee5\u53ca\u89e3\u51b3\u65b9\u6848\u3002 \u672c ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/kbwp.transwarp.cn\/?p=4458\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4458","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/4458","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\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4458"}],"version-history":[{"count":2,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/4458\/revisions"}],"predecessor-version":[{"id":4486,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/4458\/revisions\/4486"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4458"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}