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                            <article id="post-9523" class="post-9523 post type-post status-publish format-standard hentry category-bigdata tag-117 tag-mpp tag-121 tag-125 tag-119 tag-120 tag-123 tag-124 tag-122 entry">
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                            <h1 class="entry-title">通过hive访问hbase中的表详解大数据</h1>
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                                                                <time class="entry-date published" datetime="2021-07-19T11:19:10+08:00" pubdate>
                                    2021年7月19日 11:19                                </time>
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                                <a href="https://blog.ytso.com/category/tech/bigdata" rel="category tag">大数据</a>                                                            </div>
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                            <div class="Blog_wz1" style="font-size:16px;">
 在hbase中创建表后,我们只能在hbase shell中使用scan查询数据,这对于熟悉SQL的使用者不怎么习惯,不过我们可以在hive中创建外部表来访问hbase表中的数据,例子如下:</p>
<p> 1.这里hbase中的表oss_user_label_action_data已经存在<br /> <br /> =&gt; #&lt;#:0xd5a1b0&gt;<br /> <br /> hbase(main):067:0&gt; scan 'oss_user_label_action_data',LIMIT=&gt;1<br /> <br /> ROW &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;COLUMN+CELL &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:areacode, timestamp=1415243857802, value=22 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:cardtype, timestamp=1415243857802, value=1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:createtime, timestamp=1415243857802, value=20141028 11:18:34 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:enable_flag, timestamp=1415243857802, value=0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:extstring, timestamp=1415243857802, value= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:labelno, timestamp=1415243857802, value=31130101 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:labelvalue, timestamp=1415243857802, value=9693 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:modifytime, timestamp=1415243857802, value=20141028 11:18:45 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:monthno, timestamp=1415243857802, value=201407 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:provcode, timestamp=1415243857802, value=1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> &nbsp;201407|31130101|8613500000001 &nbsp; &nbsp; column=info:usernumber, timestamp=1415243857802, value=8613500000001 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<br /> <br /> 1 row(s) in 0.0580 seconds</p>
<p> 2.创建外部表<br /> <br /> CREATE EXTERNAL TABLE hive_oss_user_label_action_data(<br /> <br /> key string,&nbsp;<br /> <br /> monthno string,<br /> <br /> usernumber string,<br /> <br /> labelno string,<br /> <br /> labelvalue string,<br /> <br /> provcode string,<br /> <br /> areacode string,<br /> <br /> cardtype string,<br /> <br /> extstring string,<br /> <br /> createtime string,<br /> <br /> modifytime string<br /> <br /> )&nbsp;<br /> <br /> STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'&nbsp;<br /> <br /> WITH SERDEPROPERTIES<br /> <br /> <span style="color:rgb(229,51,51);">("hbase.columns.mapping" =&nbsp;</span><br /> <br /> <span style="color:rgb(229,51,51);">":key,info:monthno,info:usernumber,info:labelno,info:labelvalue,info:provcode,info:areacode,info:cardtype,info:extstring,info:createtime,info:modifytime")</span><br /> <br /> TBLPROPERTIES("hbase.table.name" = "oss_user_label_action_data");</p>
<p> 注意hbase.columns.mapping后面的字段直接不能出现空格和换行.</p>
<p> 3.通过hive查询数据<br /> <br /> 根据rowkey查询<br /> <br /> select * from hive_oss_user_label_action_data where key='201407|31130101|8613500000001'</p>
<p> 根据某个字段查询<br /> <br /> select * from hive_oss_user_label_action_data where usernumber='8613500000001'</p>
<p> 组合查询<br /> <br /> select * from hive_oss_user_label_action_data where usernumber='8613500000001' and labelno='31130101'<br /> </p>
<div>
<p> 说明:<br />  <br /> 这里我们访问的hive_oss_user_label_action_data表是虚表,数据是存储在hbase中的,我们可以创建另外一个hive中的表,<br />  <br /> 将hbase中的数据加载到hive本地</p>
<p> 创建另外一个表<br />  <br /> CREATE TABLE hive_oss_user_label_action_data_local(<br />  <br /> key string,&nbsp;<br />  <br /> monthno string,<br />  <br /> usernumber string,<br />  <br /> labelno string,<br />  <br /> labelvalue string,<br />  <br /> provcode string,<br />  <br /> areacode string,<br />  <br /> cardtype string,<br />  <br /> extstring string,<br />  <br /> createtime string,<br />  <br /> modifytime string<br />  <br /> )<br />  <br /> ROW FORMAT DELIMITED<br />  <br /> FIELDS TERMINATED BY '/t'<br />  <br /> STORED AS TEXTFILE;</p>
<p> 将hbase中的表数据加载到本地表<br />  <br /> INSERT OVERWRITE TABLE hive_oss_user_label_action_data_local SELECT * FROM hive_oss_user_label_action_data;</p>
<p> -- The End -- </p></div>
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