如何更换Azure SQL DB blob storage credentials

通过Azure Data Studio等工具登录到目标DB，执行以下SQL删除当前的credentials。

DROP EXTERNAL DATA SOURCE BlobStorageDataSource;

DROP DATABASE SCOPED CREDENTIAL BlobAccessCredential;

执行以下SQL创建一个新的credentials（将Placeholder替换为真实环境的值）。

• PLACEHOLDER_BLOB_SHARED_ACCESS_SIGNATURE: storage SAS token
• PLACEHOLDER_BLOB_NAME: storage name

CREATE DATABASE SCOPED CREDENTIAL BlobAccessCredential
WITH IDENTITY = 'SHARED ACCESS SIGNATURE',
SECRET = 'PLACEHOLDER_BLOB_SHARED_ACCESS_SIGNATURE';
 
CREATE EXTERNAL DATA SOURCE BlobStorageDataSource
WITH (TYPE = BLOB_STORAGE,
    LOCATION = 'https://PLACEHOLDER_BLOB_NAME.blob.core.windows.net',
    CREDENTIAL= BlobAccessCredential);