Pg depend display

See also: http://archives.postgresql.org/pgsql-hackers/2011-01/msg00894.php
SELECT classid::regclass AS "depender object class",
 CASE classid
 WHEN 'pg_class'::regclass THEN objid::regclass::text
 WHEN 'pg_type'::regclass THEN objid::regtype::text
 WHEN 'pg_proc'::regclass THEN objid::regprocedure::text
 ELSE objid::text 
 END AS "depender object identity",
 objsubid,
 refclassid::regclass AS "referenced object class",
 CASE refclassid
 WHEN 'pg_class'::regclass THEN refobjid::regclass::text
 WHEN 'pg_type'::regclass THEN refobjid::regtype::text
 WHEN 'pg_proc'::regclass THEN refobjid::regprocedure::text
 ELSE refobjid::text
 END AS "referenced object identity",
 refobjsubid,
 CASE deptype
 WHEN 'p' THEN 'pinned'
 WHEN 'i' THEN 'internal'
 WHEN 'a' THEN 'automatic'
 WHEN 'n' THEN 'normal'
 END AS "dependency type"
FROM pg_catalog.pg_depend ;
If you are interested only in dependencies on user objects only (not system objects), add 
WHERE objid >= 16384 OR refobjid >= 16384
or some such.
Note that this doesn't readily work in 8.2 and earlier, because the various regXXX types cannot be casted to text. As a workaround, you can use this:
SELECT classid::regclass AS "depender object class",
 CASE classid
 WHEN 'pg_class'::regclass THEN textin(regclassout(objid::regclass))
 WHEN 'pg_type'::regclass THEN textin(regtypeout(objid::regtype))
 WHEN 'pg_proc'::regclass THEN textin(regprocedureout(objid::regprocedure))
 ELSE objid::text 
 END AS "depender object identity",
 objsubid,
 refclassid::regclass AS "referenced object class",
 CASE refclassid
 WHEN 'pg_class'::regclass THEN textin(regclassout(refobjid::regclass))
 WHEN 'pg_type'::regclass THEN textin(regtypeout(refobjid::regtype))
 WHEN 'pg_proc'::regclass THEN textin(regprocedureout(refobjid::regprocedure))
 ELSE refobjid::text
 END AS "referenced object identity",
 refobjsubid,
 CASE deptype
 WHEN 'p' THEN 'pinned'
 WHEN 'i' THEN 'internal'
 WHEN 'a' THEN 'automatic'
 WHEN 'n' THEN 'normal'
 END AS "dependency type"
FROM pg_catalog.pg_depend ;
The following view and functions (for 9.2 onward) produce object dependency reports practical for day-to-day use.
/**** Usage Examples ****
-- Examine the entire object hierarchy
SELECT report.dependency_tree();
-- Dependencies for any relations with names containing match (in regular expression)
SELECT report.dependency_tree('match');
-- Dependencies for relations person & address
SELECT report.dependency_tree('{person,address}'::text[]);
-- Dependencies for function slice
SELECT report.dependency_tree(ARRAY['slice'::regproc]);
-- Dependencies for type hstore
SELECT report.dependency_tree(ARRAY['hstore'::regtype]);
-- Dependencies for triggers by the name updated
SELECT report.dependency_tree(ARRAY(
 SELECT oid FROM pg_trigger WHERE tgname ~ 'updated'
 ));
-- Dependencies for foreign key constraint names starting with product
SELECT report.dependency_tree(ARRAY(
 SELECT oid FROM pg_constraint
 WHERE conname ~ '^product.*_fk'
 ));
*/
DROP VIEW IF EXISTS report.dependency;
CREATE OR REPLACE VIEW report.dependency AS
WITH RECURSIVE preference AS (
 SELECT 10 AS max_depth -- The deeper the recursion goes, the slower it performs.
 , 16384 AS min_oid -- user objects only
 , '^(londiste|pgq|pg_toast)'::text AS schema_exclusion
 , '^pg_(conversion|language|ts_(dict|template))'::text AS class_exclusion
 , '{"SCHEMA":"00", "TABLE":"01", "CONSTRAINT":"02", "DEFAULT":"03",
 "INDEX":"05", "SEQUENCE":"06", "TRIGGER":"07", "FUNCTION":"08",
 "VIEW":"10", "MVIEW":"11", "FOREIGN":"12"}'::json AS type_ranks
)
, dependency_pair AS (
 WITH relation_object AS (
 SELECT oid
 , oid::regclass::text AS object_name
 , CASE relkind
 WHEN 'r' THEN 'TABLE'::text
 WHEN 'i' THEN 'INDEX'::text
 WHEN 'S' THEN 'SEQUENCE'::text
 WHEN 'v' THEN 'VIEW'::text
 WHEN 'm' THEN 'MVIEW'::text
 WHEN 'c' THEN 'TYPE'::text -- COMPOSITE type
 WHEN 't' THEN 'TOAST'::text
 WHEN 'f' THEN 'FOREIGN'::text
 END AS object_type
 FROM pg_class
 )
 SELECT
 objid,
 CASE classid
 WHEN 'pg_amop'::regclass THEN 'ACCESS METHOD OPERATOR'
 WHEN 'pg_amproc'::regclass THEN 'ACCESS METHOD PROCEDURE'
 WHEN 'pg_attrdef'::regclass THEN 'DEFAULT'
 WHEN 'pg_cast'::regclass THEN 'CAST'
 WHEN 'pg_class'::regclass THEN rel.object_type
 WHEN 'pg_constraint'::regclass THEN 'CONSTRAINT'
 WHEN 'pg_extension'::regclass THEN 'EXTENSION'
 WHEN 'pg_namespace'::regclass THEN 'SCHEMA'
 WHEN 'pg_opclass'::regclass THEN 'OPERATOR CLASS'
 WHEN 'pg_operator'::regclass THEN 'OPERATOR'
 WHEN 'pg_opfamily'::regclass THEN 'OPERATOR FAMILY'
 WHEN 'pg_proc'::regclass THEN 'FUNCTION'
 WHEN 'pg_rewrite'::regclass THEN (SELECT concat(object_type,' RULE') FROM pg_rewrite e JOIN relation_object r ON r.oid = ev_class WHERE e.oid = objid)
 WHEN 'pg_trigger'::regclass THEN 'TRIGGER'
 WHEN 'pg_type'::regclass THEN 'TYPE'
 ELSE classid::regclass::text
 END AS object_type,
 CASE classid
 WHEN 'pg_attrdef'::regclass THEN (SELECT attname FROM pg_attrdef d JOIN pg_attribute c ON (c.attrelid,c.attnum)=(d.adrelid,d.adnum) WHERE d.oid = objid)
 WHEN 'pg_cast'::regclass THEN (SELECT concat(castsource::regtype::text, ' AS ', casttarget::regtype::text,' WITH ', castfunc::regprocedure::text) FROM pg_cast WHERE oid = objid)
 WHEN 'pg_class'::regclass THEN rel.object_name
 WHEN 'pg_constraint'::regclass THEN (SELECT conname FROM pg_constraint WHERE oid = objid)
 WHEN 'pg_extension'::regclass THEN (SELECT extname FROM pg_extension WHERE oid = objid)
 WHEN 'pg_namespace'::regclass THEN (SELECT nspname FROM pg_namespace WHERE oid = objid)
 WHEN 'pg_opclass'::regclass THEN (SELECT opcname FROM pg_opclass WHERE oid = objid)
 WHEN 'pg_operator'::regclass THEN (SELECT oprname FROM pg_operator WHERE oid = objid)
 WHEN 'pg_opfamily'::regclass THEN (SELECT opfname FROM pg_opfamily WHERE oid = objid)
 WHEN 'pg_proc'::regclass THEN objid::regprocedure::text
 WHEN 'pg_rewrite'::regclass THEN (SELECT ev_class::regclass::text FROM pg_rewrite WHERE oid = objid)
 WHEN 'pg_trigger'::regclass THEN (SELECT tgname FROM pg_trigger WHERE oid = objid)
 WHEN 'pg_type'::regclass THEN objid::regtype::text
 ELSE objid::text
 END AS object_name,
 array_agg(objsubid ORDER BY objsubid) AS objsubids,
 refobjid,
 CASE refclassid
 WHEN 'pg_namespace'::regclass THEN 'SCHEMA'
 WHEN 'pg_class'::regclass THEN rrel.object_type
 WHEN 'pg_opfamily'::regclass THEN 'OPERATOR FAMILY'
 WHEN 'pg_proc'::regclass THEN 'FUNCTION'
 WHEN 'pg_type'::regclass THEN 'TYPE'
 ELSE refclassid::text
 END AS refobj_type,
 CASE refclassid
 WHEN 'pg_namespace'::regclass THEN (SELECT nspname FROM pg_namespace WHERE oid = refobjid)
 WHEN 'pg_class'::regclass THEN rrel.object_name
 WHEN 'pg_opfamily'::regclass THEN (SELECT opfname FROM pg_opfamily WHERE oid = refobjid)
 WHEN 'pg_proc'::regclass THEN refobjid::regprocedure::text
 WHEN 'pg_type'::regclass THEN refobjid::regtype::text
 ELSE refobjid::text
 END AS refobj_name,
 array_agg(refobjsubid ORDER BY refobjsubid) AS refobjsubids,
 CASE deptype
 WHEN 'n' THEN 'normal'
 WHEN 'a' THEN 'automatic'
 WHEN 'i' THEN 'internal'
 WHEN 'e' THEN 'extension'
 WHEN 'p' THEN 'pinned'
 END AS dependency_type
 FROM pg_depend dep
 LEFT JOIN relation_object rel ON rel.oid = dep.objid
 LEFT JOIN relation_object rrel ON rrel.oid = dep.refobjid
 , preference
 WHERE deptype = ANY('{n,a}')
 AND objid >= preference.min_oid
 AND (refobjid >= preference.min_oid OR refobjid = 2200) -- need public schema as root node
 AND classid::regclass::text !~ preference.class_exclusion
 AND refclassid::regclass::text !~ preference.class_exclusion
 AND coalesce(substring(objid::regclass::text, E'^(\\w+)\\.'),) !~ preference.schema_exclusion
 AND coalesce(substring(refobjid::regclass::text, E'^(\\w+)\\.'),) !~ preference.schema_exclusion
 GROUP BY classid, objid, refclassid, refobjid, deptype, rel.object_name, rel.object_type, rrel.object_name, rrel.object_type
)
, dependency_hierarchy AS (
 SELECT DISTINCT
 0 AS level,
 refobjid AS objid,
 refobj_type AS object_type,
 refobj_name AS object_name,
 --refobjsubids AS objsubids,
 NULL::text AS dependency_type,
 ARRAY[refobjid] AS dependency_chain,
 ARRAY[concat(preference.type_ranks->>refobj_type,refobj_type,' ',refobj_name)] AS dependency_name_chain
 FROM dependency_pair root
 , preference
 WHERE NOT EXISTS
 (SELECT 'x' FROM dependency_pair branch WHERE branch.objid = root.refobjid)
 AND refobj_name !~ preference.schema_exclusion
 UNION ALL
 SELECT
 level + 1 AS level,
 child.objid,
 child.object_type,
 child.object_name,
 --child.objsubids,
 child.dependency_type,
 parent.dependency_chain || child.objid,
 parent.dependency_name_chain || concat(preference.type_ranks->>child.object_type,child.object_type,' ',child.object_name)
 FROM dependency_pair child
 JOIN dependency_hierarchy parent ON (parent.objid = child.refobjid)
 , preference
 WHERE level < preference.max_depth
 AND child.object_name !~ preference.schema_exclusion
 AND child.refobj_name !~ preference.schema_exclusion
 AND NOT (child.objid = ANY(parent.dependency_chain)) -- prevent circular referencing
)
SELECT * FROM dependency_hierarchy
ORDER BY dependency_chain ;
-- Procedure to report depedency tree using regexp search pattern (relation-only)
CREATE OR REPLACE FUNCTION report.dependency_tree(search_pattern text)
 RETURNS TABLE(dependency_tree text)
 SECURITY DEFINER LANGUAGE SQL
 AS $function$
WITH target AS (
 SELECT objid, dependency_chain
 FROM report.dependency
 WHERE object_name ~ search_pattern
)
, list AS (
 SELECT
 format('%*s%s %s', -4*level
 , CASE WHEN object_name ~ search_pattern THEN '*' END
 , object_type, object_name
 ) AS dependency_tree
 , dependency_name_chain
 FROM target
 JOIN report.dependency report
 ON report.objid = ANY(target.dependency_chain) -- root-bound chain
 OR target.objid = ANY(report.dependency_chain) -- leaf-bound chain
 WHERE length(search_pattern) > 0
 -- Do NOT waste search time on blank/null search_pattern.
 UNION
 -- Query the entire dependencies instead.
 SELECT
 format('%*s%s %s', 4*level, , object_type, object_name) AS depedency_tree
 , dependency_name_chain
 FROM report.dependency
 WHERE length(coalesce(search_pattern,)) = 0
)
SELECT dependency_tree FROM list
ORDER BY dependency_name_chain;
$function$ ;
-- Procedure to report depedency tree by specific relation name(s) (in text array)
CREATE OR REPLACE FUNCTION report.dependency_tree(object_names text[])
 RETURNS TABLE(dependency_tree text)
 SECURITY DEFINER LANGUAGE SQL
 AS $function$
WITH target AS (
 SELECT objid, dependency_chain
 FROM report.dependency
 JOIN unnest(object_names) AS target(objname) ON objid = objname::regclass
)
, list AS (
 SELECT DISTINCT
 format('%*s%s %s', -4*level
 , CASE WHEN object_name = ANY(object_names) THEN '*' END
 , object_type, object_name
 ) AS dependency_tree
 , dependency_name_chain
 FROM target
 JOIN report.dependency report
 ON report.objid = ANY(target.dependency_chain) -- root-bound chain
 OR target.objid = ANY(report.dependency_chain) -- leaf-bound chain
)
SELECT dependency_tree FROM list
ORDER BY dependency_name_chain;
$function$ ;
-- Procedure to report depedency tree by oid
CREATE OR REPLACE FUNCTION report.dependency_tree(object_ids oid[])
 RETURNS TABLE(dependency_tree text)
 SECURITY DEFINER LANGUAGE SQL
 AS $function$
WITH target AS (
 SELECT objid, dependency_chain
 FROM report.dependency
 JOIN unnest(object_ids) AS target(objid) USING (objid)
)
, list AS (
 SELECT DISTINCT
 format('%*s%s %s', -4*level
 , CASE WHEN report.objid = ANY(object_ids) THEN '*' END
 , object_type, object_name
 ) AS dependency_tree
 , dependency_name_chain
 FROM target
 JOIN report.dependency report
 ON report.objid = ANY(target.dependency_chain) -- root-bound chain
 OR target.objid = ANY(report.dependency_chain) -- leaf-bound chain
)
SELECT dependency_tree FROM list
ORDER BY dependency_name_chain;
$function$ ;
With availability of pg_identify_object() system function on 9.3, the view and function outputs can be improved with the following code.
CREATE OR REPLACE VIEW report.dependency AS
WITH RECURSIVE preference AS (
 SELECT 10 AS max_depth
 , 16384 AS min_oid -- user objects only
 , '^(londiste|pgq|pg_toast)'::text AS schema_exclusion
 , '^pg_(conversion|language|ts_(dict|template))'::text AS class_exclusion
 , '{"SCHEMA":"00", "TABLE":"01", "TABLE CONSTRAINT":"02", "DEFAULT VALUE":"03",
 "INDEX":"05", "SEQUENCE":"06", "TRIGGER":"07", "FUNCTION":"08",
 "VIEW":"10", "MATERIALIZED VIEW":"11", "FOREIGN TABLE":"12"}'::json AS type_sort_orders
)
, dependency_pair AS (
 SELECT objid
 , array_agg(objsubid ORDER BY objsubid) AS objsubids
 , upper(obj.type) AS object_type
 , coalesce(obj.schema, substring(obj.identity, E'(\\w+?)\\.'), ) AS object_schema
 , obj.name AS object_name
 , obj.identity AS object_identity
 , refobjid
 , array_agg(refobjsubid ORDER BY refobjsubid) AS refobjsubids
 , upper(refobj.type) AS refobj_type
 , coalesce(CASE WHEN refobj.type='schema' THEN refobj.identity
 ELSE refobj.schema END
 , substring(refobj.identity, E'(\\w+?)\\.'), ) AS refobj_schema
 , refobj.name AS refobj_name
 , refobj.identity AS refobj_identity
 , CASE deptype
 WHEN 'n' THEN 'normal'
 WHEN 'a' THEN 'automatic'
 WHEN 'i' THEN 'internal'
 WHEN 'e' THEN 'extension'
 WHEN 'p' THEN 'pinned'
 END AS dependency_type
 FROM pg_depend dep
 , LATERAL pg_identify_object(classid, objid, 0) AS obj
 , LATERAL pg_identify_object(refclassid, refobjid, 0) AS refobj
 , preference
 WHERE deptype = ANY('{n,a}')
 AND objid >= preference.min_oid
 AND (refobjid >= preference.min_oid OR refobjid = 2200) -- need public schema as root node
 AND coalesce(obj.schema, substring(obj.identity, E'(\\w+?)\\.'), ) !~ preference.schema_exclusion
 AND coalesce(CASE WHEN refobj.type='schema' THEN refobj.identity
 ELSE refobj.schema END
 , substring(refobj.identity, E'(\\w+?)\\.'), ) !~ preference.schema_exclusion
 GROUP BY objid, obj.type, obj.schema, obj.name, obj.identity
 , refobjid, refobj.type, refobj.schema, refobj.name, refobj.identity, deptype
)
, dependency_hierarchy AS (
 SELECT DISTINCT
 0 AS level,
 refobjid AS objid,
 refobj_type AS object_type,
 refobj_identity AS object_identity,
 --refobjsubids AS objsubids,
 NULL::text AS dependency_type,
 ARRAY[refobjid] AS dependency_chain,
 ARRAY[concat(preference.type_sort_orders->>refobj_type,refobj_type,':',refobj_identity)] AS dependency_sort_chain
 FROM dependency_pair root
 , preference
 WHERE NOT EXISTS
 (SELECT 'x' FROM dependency_pair branch WHERE branch.objid = root.refobjid)
 AND refobj_schema !~ preference.schema_exclusion
 UNION ALL
 SELECT
 level + 1 AS level,
 child.objid,
 child.object_type,
 child.object_identity,
 --child.objsubids,
 child.dependency_type,
 parent.dependency_chain || child.objid,
 parent.dependency_sort_chain || concat(preference.type_sort_orders->>child.object_type,child.object_type,':',child.object_identity)
 FROM dependency_pair child
 JOIN dependency_hierarchy parent ON (parent.objid = child.refobjid)
 , preference
 WHERE level < preference.max_depth
 AND child.object_schema !~ preference.schema_exclusion
 AND child.refobj_schema !~ preference.schema_exclusion
 AND NOT (child.objid = ANY(parent.dependency_chain)) -- prevent circular referencing
)
SELECT * FROM dependency_hierarchy
ORDER BY dependency_chain ;
-- Procedure to report depedency tree using regexp search pattern (relation-only)
CREATE OR REPLACE FUNCTION report.dependency_tree(search_pattern text)
 RETURNS TABLE(dependency_tree text)
 SECURITY DEFINER LANGUAGE SQL
 AS $function$
WITH target AS (
 SELECT objid, dependency_chain
 FROM report.dependency
 WHERE object_identity ~ search_pattern
)
, list AS (
 SELECT
 format('%*s%s %s', -4*level
 , CASE WHEN object_identity ~ search_pattern THEN '*' END
 , object_type, object_identity
 ) AS dependency_tree
 , dependency_sort_chain
 FROM target
 JOIN report.dependency report
 ON report.objid = ANY(target.dependency_chain) -- root-bound chain
 OR target.objid = ANY(report.dependency_chain) -- leaf-bound chain
 WHERE length(search_pattern) > 0
 -- Do NOT waste search time on blank/null search_pattern.
 UNION
 -- Query the entire dependencies instead.
 SELECT
 format('%*s%s %s', 4*level, , object_type, object_identity) AS depedency_tree
 , dependency_sort_chain
 FROM report.dependency
 WHERE length(coalesce(search_pattern,)) = 0
)
SELECT dependency_tree FROM list
ORDER BY dependency_sort_chain;
$function$ ;
-- Procedure to report depedency tree by specific relation name(s) (in text array)
CREATE OR REPLACE FUNCTION report.dependency_tree(object_names text[])
 RETURNS TABLE(dependency_tree text)
 SECURITY DEFINER LANGUAGE SQL
 AS $function$
WITH target AS (
 SELECT objid, dependency_chain
 FROM report.dependency
 JOIN unnest(object_names) AS target(objname) ON objid = objname::regclass
)
, list AS (
 SELECT DISTINCT
 format('%*s%s %s', -4*level
 , CASE WHEN object_identity = ANY(object_names) THEN '*' END
 , object_type, object_identity
 ) AS dependency_tree
 , dependency_sort_chain
 FROM target
 JOIN report.dependency report
 ON report.objid = ANY(target.dependency_chain) -- root-bound chain
 OR target.objid = ANY(report.dependency_chain) -- leaf-bound chain
)
SELECT dependency_tree FROM list
ORDER BY dependency_sort_chain;
$function$ ;
-- Procedure to report depedency tree by oid
CREATE OR REPLACE FUNCTION report.dependency_tree(object_ids oid[])
 RETURNS TABLE(dependency_tree text)
 SECURITY DEFINER LANGUAGE SQL
 AS $function$
WITH target AS (
 SELECT objid, dependency_chain
 FROM report.dependency
 JOIN unnest(object_ids) AS target(objid) USING (objid)
)
, list AS (
 SELECT DISTINCT
 format('%*s%s %s', -4*level
 , CASE WHEN report.objid = ANY(object_ids) THEN '*' END
 , object_type, object_identity
 ) AS dependency_tree
 , dependency_sort_chain
 FROM target
 JOIN report.dependency report
 ON report.objid = ANY(target.dependency_chain) -- root-bound chain
 OR target.objid = ANY(report.dependency_chain) -- leaf-bound chain
)
SELECT dependency_tree FROM list
ORDER BY dependency_sort_chain;
$function$ ;
Category:SQL