Postgresql 查询表引用或被引用的外键操作_PostgreSQL_

 test=# create table test01( test(# id int primary key, test(# col1 varchar(20) test(# ); CREATE TABLE test=# create table test02( test(# id int primary key, test(# test01_id int references test01(id), test(# col1 varchar(20) test(# ); CREATE TABLE

 test=# insert into test01 values (1, 'a'); INSERT 0 1 test=# insert into test01 values (2, 'b'); INSERT 0 1 test=# insert into test01 values (3, 'c'); INSERT 0 1 test=# insert into test02 values (1, 1, 'a'); INSERT 0 1 test=# insert into test02 values (2, 1, 'a'); INSERT 0 1 test=# insert into test02 values (3, 1, 'a'); INSERT 0 1 test=# insert into test02 values (4, 2, 'b'); INSERT 0 1 test=# insert into test02 values (5, 2, 'b'); INSERT 0 1 test=# insert into test02 values (6, 11, 'b'); ERROR: insert or update on table "test02" violates foreign key constraint "test02_test01_id_fkey" DETAIL: Key (test01_id)=(11) is not present in table "test01".

 test=# SELECT tc.constraint_name, tc.table_name, # 子表 kcu.column_name, ccu.table_name AS foreign_table_name, # 主表 ccu.column_name AS foreign_column_name, tc.is_deferrable, tc.initially_deferred FROM information_schema.table_constraints AS tc JOIN information_schema.key_column_usage AS kcu ON tc.constraint_name = kcu.constraint_name JOIN information_schema.constraint_column_usage AS ccu ON ccu.constraint_name = tc.constraint_name where constraint_type = 'FOREIGN KEY' AND ccu.table_name='test01'; # 输入主表 constraint_name | table_name | column_name | foreign_table_name | foreign_column_name | is_deferrable | initially_deferred -----------------------+------------+-------------+--------------------+---------------------+---------------+-------------------- test02_test01_id_fkey | test02 | test01_id | test01 | id | NO | NO (1 row)

 test=# SELECT tc.constraint_name, tc.table_name, # 子表 kcu.column_name, ccu.table_name AS foreign_table_name, ccu.column_name AS foreign_column_name, # 主表 tc.is_deferrable, tc.initially_deferred FROM information_schema.table_constraints AS tc JOIN information_schema.key_column_usage AS kcu ON tc.constraint_name = kcu.constraint_name JOIN information_schema.constraint_column_usage AS ccu ON ccu.constraint_name = tc.constraint_name WHERE constraint_type = 'FOREIGN KEY' AND tc.table_name='test02'; # 输入子表 constraint_name | table_name | column_name | foreign_table_name | foreign_column_name | is_deferrable | initially_deferred -----------------------+------------+-------------+--------------------+---------------------+---------------+-------------------- test02_test01_id_fkey | test02 | test01_id | test01 | id | NO | NO (1 row)

 SELECT x.table_name, x.column_name FROM information_schema.key_column_usage x INNER JOIN (SELECT t.relname, a.conname FROM pg_constraint a INNER JOIN pg_class ft ON ft.oid = a.confrelid INNER JOIN pg_class t ON t.oid = a.conrelid WHERE a.contype = 'f' AND a.confrelid = (select e.oid from pg_class e where e.relname = 'xxx_table') ) tp ON (x.table_name = tp.relname AND x.constraint_name = tp.conname)