USql呼叫数据我有一个数据湖这个JSON文件看起来像这样:多维JSON阵列
{
"id":"398507",
"contenttype":"POST",
"posttype":"post",
"uri":"http://twitter.com/etc",
"title":null,
"profile":{
"@class":"PublisherV2_0",
"name":"Company",
"id":"2163171",
"profileIcon":"https://pbs.twimg.com/image",
"profileLocation":{
"@class":"DocumentLocation",
"locality":"Toronto",
"adminDistrict":"ON",
"countryRegion":"Canada",
"coordinates":{
"latitude":43.7217,
"longitude":-31.432},
"quadKey":"000000000000000"},
"displayName":"Name",
"externalId":"00000000000"},
"source":{
"name":"blogs",
"id":"18",
"param":"Twitter"},
"content":{
"text":"Description of post"},
"language":{
"name":"English",
"code":"en"},
"abstracttext":"More Text and links",
"score":{}
}
}
以数据调用到我的申请,我要转JSON转换成字符串使用此代码:
DECLARE @input string = @"/MSEStream/{*}.json";
REFERENCE ASSEMBLY [Newtonsoft.Json];
REFERENCE ASSEMBLY [Microsoft.Analytics.Samples.Formats];
@allposts =
EXTRACT
jsonString string
FROM @input
USING Extractors.Text(delimiter:'\b', quoting:true);
@extractedrows = SELECT Microsoft.Analytics.Samples.Formats.Json.JsonFunctions.JsonTuple(jsonString) AS er FROM @allposts;
@result =
SELECT er["id"] AS postID,
er["contenttype"] AS contentType,
er["posttype"] AS postType,
er["uri"] AS uri,
er["title"] AS Title,
er["acquisitiondate"] AS acquisitionDate,
er["modificationdate"] AS modificationDate,
er["publicationdate"] AS publicationDate,
er["profile"] AS profile
FROM @extractedrows;
OUTPUT @result
TO "/ProcessedQueries/all_posts.csv"
USING Outputters.Csv();
此输出的JSON到.csv文件,该文件是可读的,当我下载的文件正确显示所有数据。我的问题是当我需要获取配置文件内的数据。因为JSON现在是一个字符串,我似乎无法提取任何数据并将其放入要使用的变量中。有没有办法做到这一点?还是我需要查看其他选项来读取数据?