[Oracle] dbms_metadata. get_ddl

dbms_metadata. get_ddl () is used to get the DDL of the object as follows.
Note: In sqlplus, in order to better demonstrate DDL, the following parameters need to be set:

set line 200
set pagesize 0
set long 99999
set feedback off
set echo off

1) Get the DDL for tables, indexes, views, stored procedures, and functions

select dbms_metadata.get_ddl('TABLE','TABLE_NAME','TABLE_OWNER') from dual;
select dbms_metadata.get_ddl('INDEX','INDEX_NAME','INDEX_OWNER') from dual;
select dbms_metadata.get_ddl('VIEW','VIEW_NAME','VIEW_OWNER') from dual;
select dbms_metadata.get_ddl('PROCEDURE','PROCEDURE_NAME','PROCEDURE_OWNER') from dual;
select dbms_metadata.get_ddl('FUNCTION','FUNCTION_NAME','FUNCTION_OWNER') from dual;

The following script is used to get the DDL of all tables, indexes, views, stored procedures and functions under an schema

set pagesize 0
set long 90000
set feedback off
set echo off
spool schema_ddl.sql
SELECT DBMS_METADATA.GET_DDL('TABLE',u.table_name,u.owner) FROM DBA_TABLES u;
SELECT DBMS_METADATA.GET_DDL('VIEW',u.view_name,u.owner) FROM DBA_VIEWS u;
SELECT DBMS_METADATA.GET_DDL('INDEX',u.index_name,u.owner) FROM DBA_INDEXES u;
select dbms_metadata.get_ddl('PROCEDURE',u.object_name, u.owner,) from dba_objects u where u.object_type = 'PROCEDURE';
select dbms_metadata.get_ddl('FUNCTION',u.object_name, u.owner,) from dba_objects u where u.object_type = 'FUNCTION';
spool off;

2) Get the DDL of the tablespace
Get the DDL for a single tablespace:

select dbms_metadata.get_ddl('TABLESPACE','TBS_NAME') from dual;

Get DDL for all tablespaces:

SELECT DBMS_METADATA.GET_DDL('TABLESPACE', TS.tablespace_name)
FROM DBA_TABLESPACES TS;

3) Obtain the user's DDL
Get the DDL for a single user:

select dbms_metadata.get_ddl('USER','EPAY_USER') from dual;

Get DDL for all users:

SELECT DBMS_METADATA.GET_DDL('USER',U.username) 
FROM DBA_USERS U;