Initializes a System.Data.IDbCommand object to set the sopInstanceUid and externalStoreGuid in the database that identifies which external addin is used for the 'External Store'.
command
Type: System.Data.IDbCommand The database command that will be initialized to execute the query.
sopInstanceUid
The SOP Instance UID that identifies the instance.
externalStoreGuid
The 'External Store' unique identifier.
Data can be stored on more than one 'External Store'. For each 'External Store', there is a corresponding add-in. Each add-in can be identified by a global unique identifier.