Get DDL command from oracle database objects without using dbms_metadata - sql

Question

I am doing a procedure in the oracle database that has the function of performing a kind of inventory of the objects of the database.
Basically I must get the DDL of objects of type table.
For this, I am using queries from the bank itself as:
select * from user_objects;
select * from user_constraints;
select * from user_source;
My inventory must contain the following information:
Inventory information here.
How do I get the DDL command from objects without using the function:
dbms_metadata.get_ddl();
and no other ready functions from the metadata library.
I have also tried this:
SELECT
(CASE WHEN line = 1 THEN 'create or replace ' || text ELSE text END) texto
FROM user_source
WHERE NAME = '....'
ORDER BY line
but this command does not get the ddl of table objects.

Answer 1

For getting the DDL of views, it's very easy:
SELECT VIEW_NAME, TEXT FROM ALL_VIEWS;
If you want it to return just the text of a particular view, then do:
SELECT TEXT FROM ALL_VIEWS
WHERE VIEW_NAME LIKE '[name_of_view]';
Getting the DDL for tables is more cumbersome, but can be done by querying the data from several system views:
ALL_TABLES ALL_TAB_COLUMNS ALL_COL_COMMENTS
ALL_CONSTRAINTS ALL_CONS_COLUMNS ALL_INDEXES
ALL_IND_COMMENTS
For example, if you wanted to get all column names and their data types for TABLE1, you would do:
SELECT COLUMN_NAME, DATA_TYPE FROM ALL_TAB_COLUMNS
WHERE TABLE_NAME LIKE 'TABLE1';
To get a list of all constraints on a table, the query is:
SELECT * FROM ALL_CONSTRAINTS
WHERE TABLE_NAME LIKE 'TABLE1';
To get a full table definition takes a fairly good understanding of how to use these system views. A very helpful page for this can be found here: 6 Useful Oracle Data Dictionary Queries Every DBA Should Have