SQL*Plus - Spool into multiple files - oracle

Question

I've got the next spool that stores the DDL of the user_tables into a file:
set pagesize 0
set long 90000
spool C:\Users\personal\Desktop\MAIN_USR\test.txt
select DBMS_METADATA.GET_DDL('TABLE',table_name,'MAIN_USR')
FROM user_tables ut;
spool off
exit
It returns the DDL of all user_tables into a single file, but I need it to be a little more dynamic and return them in separate files with the file name of their respective table. Something like this:
set pagesize 0
set long 90000
FOR tab_nam IN (SELECT table_name FROM user_tables) LOOP
spool C:\Users\personal\Desktop\MAIN_USR\test.txt
select DBMS_METADATA.GET_DDL('TABLE',table_name,'MAIN_USR')
FROM user_tables ut;
spool off
END LOOP;
exit
I know the one above won't work, but it's kind of an idea of what I want to do.
I appreciate any kind of help

Answer 1

You need to read USER_TABLES for creating N calls to DBMS_METADATA.GET_DDL each of which has its own spooled file. Spool everything to a file named out.sql and run it after spooling it off
set pagesize 0
set long 90000
SET TERMOUT OFF
spool out.sql
select 'spool C:\Users\personal\Desktop\MAIN_USR\'||REPLACE(table_name, '$', '_')||'.txt'||chr(13)||chr(10)||
'SELECT DBMS_METADATA.GET_DDL(''TABLE'','''||table_name||''',''MAIN_USR'') FROM DUAL;'||chr(13)||chr(10)||
'spool off' as cmd
FROM user_tables ut;
spool off
#OUT.SQL
exit

Answer 2

Using python's cx_Oracle module which enables access to Oracle Database might be elegant way for your case :
import cx_Oracle
con = cx_Oracle.connect('uname/pwd#host:port/service_name')
cur = con.cursor()
def OutputTypeHandler(cursor, name, defaultType, size, precision, scale):
if defaultType == cx_Oracle.CLOB:
return cursor.var(cx_Oracle.LONG_STRING, arraysize = cursor.arraysize)
cur.outputtypehandler = OutputTypeHandler
cur.execute("select table_name from user_tables order by 1")
rec = cur.fetchall()
for r in rec:
cur.execute("select dbms_metadata.get_ddl('TABLE',:tableName) from dual",tableName=r[0])
ddl, = cur.fetchone()
file = r'C:\\Users\\personal\\Desktop\\MAIN_USR\\'+r[0]+'.txt'
with open(file,"w") as f:
f.write(ddl)
f.close()
where the table names of the whole schema are determined through the first cur.execute, and their creation DDL are done in the second, and files are created with respective table names at the last step. Important thing to consider is related to use of OutputTypeHandler is because of getting rid of processing the CLOB result steming from Dbms_Metadata.Get_Ddl function. The compiler wouldn't want to get a CLOB value during the creation of the files, or DDL would be so long that will exceed the length 4000 chars which would prevent to_char conversion with raising error without using OutputTypeHandler.