21.4 Maintaining Object Types and Object Views

What object and collection types have I created?

SELECT * FROM user_types;

SELECT * FROM user_objects

WHERE object_type = 'TYPE';

What do my object type hierarchies look like?

SELECT RPAD(' ', 3*(LEVEL-1)) || type_name

FROM user_types

WHERE typecode = 'OBJECT'

CONNECT BY PRIOR type_name = supertype_name;

What are the attributes of type foo?

SELECT * FROM user_type_attrs

WHERE type_name = 'FOO';

What are the methods of type foo?

SELECT * FROM user_type_methods

WHERE type_name = 'FOO';

What are the parameters of foo's methods?

SELECT * FROM user_method_params

WHERE type_name = 'FOO';

What datatype is returned by foo's method called bar?

SELECT * FROM user_method_results

WHERE type_name = 'FOO' AND method_name = 'BAR';

What is the source code for foo, including all ALTER statements?

SELECT text FROM user_source

WHERE name = 'FOO'

AND type = 'TYPE' /* or 'TYPE BODY' */

ORDER BY line;

What are the object tables that implement foo?

SELECT table_name FROM user_object_tables

WHERE table_type = 'FOO';

What are all the columns in an object table foo_tab, including the hidden ones?

SELECT column_name, data_type, hidden_column,

virtual_column

FROM user_tab_cols

WHERE table_name = 'FOO_TAB';

What columns implement foo?

SELECT table_name, column_name

FROM user_tab_columns

WHERE data_type = 'FOO';

What database objects depend on foo?

SELECT name, type FROM user_dependencies

WHERE referenced_name = 'FOO';

What object views have I created, using what OIDs?

SELECT view_name, view_type, oid_text

FROM user_views

WHERE type_text IS NOT NULL;

What does my view hierarchy look like? (Requires a temporary table because you can't use a subquery with CONNECT BY)

CREATE TABLE uvtemp AS

SELECT v.view_name, v.view_type,

v.superview_name, v1.view_type superview_type

FROM user_views v, user_views v1

WHERE v.superview_name = v1.view_name (+);

SELECT RPAD(' ', 3*(LEVEL-1)) || view_name

|| ' (' || view_type || ') '

FROM uvtemp

CONNECT BY PRIOR view_type = superview_type;

DROP TABLE uvtemp;

What is the query on which I defined the foo_v view?

SET LONG 1000 -- or greater

SELECT text FROM user_views

WHERE view_name = 'FOO_V';

What columns are in view foo_v?

SELECT column_name, data_type_mod, data_type

FROM user_tab_columns

WHERE table_name = 'FOO_V';