XML架构到Hive架构

我想将xml文件加载到配置单元表中。我正在使用xml serde here。我能够加载简单的平面XML文件。但是当xml中有嵌套元素时，我使用配置单元复杂数据类型来存储它们（例如，array<struct>）。以下是我正在尝试加载的示例xml。我的目标是将所有元素，属性和内容加载到配置单元表中。XML架构到Hive架构

，我试图让

<description action="up"> 
    <name action="aorup" ln="te"> 
    this is name1 
    </name> 
    <name action="aorup" ln="tm"> 
    this is name2 
    </name> 
    <name action="aorup" ln="hi"> 
    this is name2 
    </name> 
</description>

蜂巢输出...

{action:"up", name:[{action:"aorup", ln:"te", content:"this is name1"}, {action:"aorup", ln:"tm", content:"this is name2"}, {action:"aorup", ln:"hi", content:"this is name3"}]}

我想这整个XML加载到一个单一的蜂房列。我试过以下内容：

CREATE TABLE description(
description STRUCT< 
Action:STRING, 
name:ARRAY<STRUCT< 
    Action:STRING, ln:STRING, content:STRING 
    >> 
>) 
ROW FORMAT SERDE 'com.ibm.spss.hive.serde2.xml.XmlSerDe' 
WITH SERDEPROPERTIES (
"xml.processor.class"="com.ximpleware.hive.serde2.xml.vtd.XmlProcessor", 
"column.xpath.description"="/description") 
STORED AS INPUTFORMAT 'com.ibm.spss.hive.serde2.xml.XmlInputFormat' 
OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat' 
TBLPROPERTIES ("xmlinput.start"="<description ","xmlinput.end"= "</description>");

但是我得到空值为Label字段。有人能帮我吗？

感谢

来源

2017-06-09 Sri Harsha Chennavajjala

create external table description 
(
    description struct<action:string,description:array<struct<action:string,ln:string,name:string>>> 
) 
row format serde 'com.ibm.spss.hive.serde2.xml.XmlSerDe' 
with serdeproperties 
(
    "column.xpath.description" = "/description" 
) 
stored as 
inputformat  'com.ibm.spss.hive.serde2.xml.XmlInputFormat' 
outputformat 'org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat' 
tblproperties 
(
    "xmlinput.start" = "<description " 
    ,"xmlinput.end" = "</description>" 
) 
;

select * from description 
;

+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
|                       description                       | 
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| {"action":"up","description":[{"action":"aorup","ln":"te","name":"this is name1"},{"action":"aorup","ln":"tm","name":"this is name2"},{"action":"aorup","ln":"hi","name":"this is name2"}]} | 
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

来源

2017-06-09 14:40:50

非常感谢您的回答。你能解释一下'create table'语句吗？这让我很困惑。我试着在这个问题上的另一个嵌套的XML模式[链接]的解决方案（https://stackoverflow.com/questions/44494364/complex-xml-schema-to-hive-schema）。但无法获得解决方案。。你能解释我出错的地方吗？ –

XML架构到Hive架构

回答

相关问题