Get the block number through the ROWID value, the function of the file number is ____ function

Create or Replace function Get_rowid
/*
Function: Implement ROWID in Oracle into the corresponding blocks in the database, column number
*/
(L_rowid in VARCHAR2)--Input rowID
return VARCHAR2
Is
Ls_my_rowid VARCHAR2 (200);
Rowid_type number;
Object_number number;
RELATIVE_FNO number;
Block_number number;
Row_number number;


Begin
--Parse with Oracle custom packages to get the appropriate value
Dbms_rowid.rowid_info (L_rowid,rowid_type,object_number,relative_fno, Block_number, row_number);
--store the corresponding values in the variable
Ls_my_rowid: = ' data Object number: ' | | To_char (object_number) | | Chr (10) | |
' Data file Number: ' | | To_char (RELATIVE_FNO) | | Chr (10) | |
' The number of blocks in the data file: ' | | To_char (block_number) | | Chr (10) | |
' Number of rows in block: ' | | To_char (Row_number);
return ls_my_rowid;
End
/