Pg 依赖显示
来自 PostgreSQL 维基
跳转到导航跳转到搜索
另请参见：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 ;
如果您只对用户对象（而非系统对象）的依赖关系感兴趣，请添加
WHERE objid >= 16384 OR refobjid >= 16384
或类似的。
请注意，这在 8.2 及更早版本中并不容易实现，因为各种 regXXX 类型不能转换为文本。作为一种解决方法，您可以使用以下方法
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 ;
以下视图和函数（适用于 9.2 及更高版本）生成在日常使用中实用的对象依赖关系报告。
/**** 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;
$function$ ;
随着 9.3 上的 pg_identify_object() 系统函数的可用性，视图和函数输出可以通过以下代码进行改进。
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;
$function$ ;
