$blobsTable = $this->dbStore->getTable( $extDb );
$res = $extDb->select( $blobsTable,
[ 'blob_id' ],
$blobsTable = $this->dbStore->getTable( $extDb );
$res = $extDb->select( $blobsTable,
[ 'blob_id' ],
$blobsTable = $this->dbStore->getTable( $extDb );
$headerLength = strlen( self::CONCAT_HEADER );
$res = $extDb->select( $blobsTable,
$blobsTable = $this->dbStore->getTable( $extDb );
$headerLength = strlen( self::CONCAT_HEADER );
$res = $extDb->select( $blobsTable,