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(SQL Server) S3 Get Bucket Objects with CommonPrefixes

Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

// Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
//
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes the Chilkat HTTP API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Insert your access key here:
    EXEC sp_OASetProperty @http, 'AwsAccessKey', 'AWS_ACCESS_KEY'

    -- Insert your secret key here:
    EXEC sp_OASetProperty @http, 'AwsSecretKey', 'AWS_SECRET_KEY'

    -- In this example, my bucket is "chilkat100".
    -- It contains a number of folders, one of which is named "images".
    -- I want to get a list of all sub-folders under the "images" folder
    DECLARE @strXml nvarchar(4000)
    EXEC sp_OAMethod @http, 'S3_ListBucketObjects', @strXml OUT, 'chilkat100?prefix=images/&delimiter=/'
    EXEC sp_OAGetProperty @http, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        RETURN
      END


    EXEC sp_OAGetProperty @http, 'LastStatus', @iTmp0 OUT
    PRINT 'Response status code = ' + @iTmp0

    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Xml', @xml OUT

    DECLARE @success int
    EXEC sp_OAMethod @xml, 'LoadXml', @success OUT, @strXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @xml, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @xml
        RETURN
      END

    -- If the response status code was not 200, then the XML response is not a 
    -- listing of objects, but instead contains error information.
    EXEC sp_OAGetProperty @http, 'LastStatus', @iTmp0 OUT
    IF @iTmp0 <> 200
      BEGIN
        EXEC sp_OAMethod @xml, 'GetXml', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Failed.'
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @xml
        RETURN
      END

    -- A sample response is shown below.
    EXEC sp_OAMethod @xml, 'GetXml', @sTmp0 OUT
    PRINT @sTmp0

    PRINT '----'

    -- Here is the list of sub-folders (i.e. CommonPrefixes)

    -- <?xml version="1.0" encoding="UTF-8"?>
    -- <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    --     <Name>chilkat100</Name>
    --     <Prefix>images/</Prefix>
    --     <Marker/>
    --     <MaxKeys>1000</MaxKeys>
    --     <Delimiter>/</Delimiter>
    --     <IsTruncated>false</IsTruncated>
    --     <CommonPrefixes>
    --         <Prefix>images/africa/</Prefix>
    --     </CommonPrefixes>
    --     <CommonPrefixes>
    --         <Prefix>images/sea_creatures/</Prefix>
    --     </CommonPrefixes>
    -- </ListBucketResult>

    DECLARE @Prefix nvarchar(4000)

    -- The XML can be parsed like this:
    DECLARE @i int
    SELECT @i = 0
    DECLARE @count_i int
    EXEC sp_OAMethod @xml, 'NumChildrenHavingTag', @count_i OUT, 'CommonPrefixes'
    WHILE @i < @count_i
      BEGIN
        EXEC sp_OASetProperty @xml, 'I', @i
        EXEC sp_OAMethod @xml, 'GetChildContent', @Prefix OUT, 'CommonPrefixes[i]|Prefix'

        PRINT 'Prefix = ' + @Prefix
        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @xml


END
GO

 

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