This document provides an overview of the API and SDK code samples related to extracting object content.
API | Operation | Description |
---|---|---|
SELECT Object Content | Extracting object content | Extracts the content of a specified object (in CSV or JSON format) |
For the parameters and method descriptions of all the APIs in the SDK, see Api Documentation.
This API is used by the COS Select feature to extract objects in the following formats:
Note:
- To use COS Select, you must have the permission for
cos:GetObject
.- CSV- or JSON-formatted objects need to be encoded in UTF-8.
- COS Select can extract CSV- or JSON-formatted objects compressed by gzip or bzip2.
- COS Select can extract CSV- or JSON-formatted objects encrypted with SSE-COS.
try
{
string bucket = "examplebucket-1250000000"; // Bucket name in the format: BucketName-APPID
string key = "exampleobject"; // Object key
SelectObjectRequest request = new SelectObjectRequest(bucket, key);
ObjectSelectionFormat.JSONFormat jSONFormat = new ObjectSelectionFormat.JSONFormat();
jSONFormat.Type = "DOCUMENT";
jSONFormat.RecordDelimiter = "\n";
string outputFile = "select_local_file.json";
request.SetExpression("Select * from COSObject")
.SetInputFormat(new ObjectSelectionFormat(null, jSONFormat))
.SetOutputFormat(new ObjectSelectionFormat(null, jSONFormat))
.SetCosProgressCallback(delegate (long progress, long total) {
Console.WriteLine("OnProgress : " + progress + "," + total);
})
.OutputToFile(outputFile)
;
SelectObjectResult selectObjectResult = cosXml.selectObject(request);
Console.WriteLine(selectObjectResult.stat);
}
catch (COSXML.CosException.CosClientException clientEx)
{
Console.WriteLine("CosClientException: " + clientEx.StackTrace);
Console.WriteLine("CosClientException: " + clientEx.Message);
}
catch (COSXML.CosException.CosServerException serverEx)
{
Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}
Note:
For the complete sample, go to GitHub.
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