foreign_key.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

--
-- FOREIGN KEY
--
-- MATCH FULL
--
-- First test, check and cascade
--
CREATE TABLE PKTABLE ( ptest1 int PRIMARY KEY, ptest2 text );
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "pktable_pkey" for table "pktable"
CREATE TABLE FKTABLE ( ftest1 int REFERENCES PKTABLE MATCH FULL ON DELETE CASCADE ON UPDATE CASCADE, ftest2 int );
-- Insert test data into PKTABLE
INSERT INTO PKTABLE VALUES (1, 'Test1');
INSERT INTO PKTABLE VALUES (2, 'Test2');
INSERT INTO PKTABLE VALUES (3, 'Test3');
INSERT INTO PKTABLE VALUES (4, 'Test4');
INSERT INTO PKTABLE VALUES (5, 'Test5');
-- Insert successful rows into FK TABLE
INSERT INTO FKTABLE VALUES (1, 2);
INSERT INTO FKTABLE VALUES (2, 3);
INSERT INTO FKTABLE VALUES (3, 4);
INSERT INTO FKTABLE VALUES (NULL, 1);
-- Insert a failed row into FK TABLE
INSERT INTO FKTABLE VALUES (100, 2);
ERROR:  insert or update on table "fktable" violates foreign key constraint "fktable_ftest1_fkey"
DETAIL:  Key (ftest1)=(100) is not present in table "pktable".
-- Check FKTABLE
SELECT * FROM FKTABLE;
 ftest1 | ftest2 
--------+--------
      1 |      2
      2 |      3
      3 |      4
        |      1
(4 rows)

-- Delete a row from PK TABLE
DELETE FROM PKTABLE WHERE ptest1=1;
-- Check FKTABLE for removal of matched row
SELECT * FROM FKTABLE;
 ftest1 | ftest2 
--------+--------
      2 |      3
      3 |      4
        |      1
(3 rows)

-- Update a row from PK TABLE
UPDATE PKTABLE SET ptest1=1 WHERE ptest1=2;
-- Check FKTABLE for update of matched row
SELECT * FROM FKTABLE;
 ftest1 | ftest2 
--------+--------
      3 |      4
        |      1
      1 |      3
(3 rows)

DROP TABLE FKTABLE;
DROP TABLE PKTABLE;
--
-- check set NULL and table constraint on multiple columns
--
CREATE TABLE PKTABLE ( ptest1 int, ptest2 int, ptest3 text, PRIMARY KEY(ptest1, ptest2) );
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "pktable_pkey" for table "pktable"
CREATE TABLE FKTABLE ( ftest1 int, ftest2 int, ftest3 int, CONSTRAINT constrname FOREIGN KEY(ftest1, ftest2) 
                       REFERENCES PKTABLE MATCH FULL ON DELETE SET NULL ON UPDATE SET NULL);
-- Test comments
COMMENT ON CONSTRAINT constrname_wrong ON FKTABLE IS 'fk constraint comment';
ERROR:  constraint "constrname_wrong" for table "fktable" does not exist
COMMENT ON CONSTRAINT constrname ON FKTABLE IS 'fk constraint comment';
COMMENT ON CONSTRAINT constrname ON FKTABLE IS NULL;
-- Insert test data into PKTABLE
INSERT INTO PKTABLE VALUES (1, 2, 'Test1');
INSERT INTO PKTABLE VALUES (1, 3, 'Test1-2');
INSERT INTO PKTABLE VALUES (2, 4, 'Test2');
INSERT INTO PKTABLE VALUES (3, 6, 'Test3');
INSERT INTO PKTABLE VALUES (4, 8, 'Test4');
INSERT INTO PKTABLE VALUES (5, 10, 'Test5');
-- Insert successful rows into FK TABLE
INSERT INTO FKTABLE VALUES (1, 2, 4);
INSERT INTO FKTABLE VALUES (1, 3, 5);
INSERT INTO FKTABLE VALUES (2, 4, 8);
INSERT INTO FKTABLE VALUES (3, 6, 12);
INSERT INTO FKTABLE VALUES (NULL, NULL, 0);
-- Insert failed rows into FK TABLE
INSERT INTO FKTABLE VALUES (100, 2, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname"
DETAIL:  Key (ftest1,ftest2)=(100,2) is not present in table "pktable".
INSERT INTO FKTABLE VALUES (2, 2, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname"
DETAIL:  Key (ftest1,ftest2)=(2,2) is not present in table "pktable".
INSERT INTO FKTABLE VALUES (NULL, 2, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname"
DETAIL:  MATCH FULL does not allow mixing of null and nonnull key values.
INSERT INTO FKTABLE VALUES (1, NULL, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname"
DETAIL:  MATCH FULL does not allow mixing of null and nonnull key values.
-- Check FKTABLE
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      2 |      4
      1 |      3 |      5
      2 |      4 |      8
      3 |      6 |     12
        |        |      0
(5 rows)

-- Delete a row from PK TABLE
DELETE FROM PKTABLE WHERE ptest1=1 and ptest2=2;
-- Check FKTABLE for removal of matched row
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      2 |      4 |      8
      3 |      6 |     12
        |        |      0
        |        |      4
(5 rows)

-- Delete another row from PK TABLE
DELETE FROM PKTABLE WHERE ptest1=5 and ptest2=10;
-- Check FKTABLE (should be no change)
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      2 |      4 |      8
      3 |      6 |     12
        |        |      0
        |        |      4
(5 rows)

-- Update a row from PK TABLE
UPDATE PKTABLE SET ptest1=1 WHERE ptest1=2;
-- Check FKTABLE for update of matched row
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      3 |      6 |     12
        |        |      0
        |        |      4
        |        |      8
(5 rows)

-- Try altering the column type where foreign keys are involved
ALTER TABLE PKTABLE ALTER COLUMN ptest1 TYPE bigint;
ALTER TABLE FKTABLE ALTER COLUMN ftest1 TYPE bigint;
SELECT * FROM PKTABLE;
 ptest1 | ptest2 | ptest3  
--------+--------+---------
      1 |      3 | Test1-2
      3 |      6 | Test3
      4 |      8 | Test4
      1 |      4 | Test2
(4 rows)

SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      3 |      6 |     12
        |        |      0
        |        |      4
        |        |      8
(5 rows)

DROP TABLE PKTABLE CASCADE;
NOTICE:  drop cascades to constraint constrname on table fktable
DROP TABLE FKTABLE;
--
-- check set default and table constraint on multiple columns
--
CREATE TABLE PKTABLE ( ptest1 int, ptest2 int, ptest3 text, PRIMARY KEY(ptest1, ptest2) );
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "pktable_pkey" for table "pktable"
CREATE TABLE FKTABLE ( ftest1 int DEFAULT -1, ftest2 int DEFAULT -2, ftest3 int, CONSTRAINT constrname2 FOREIGN KEY(ftest1, ftest2) 
                       REFERENCES PKTABLE MATCH FULL ON DELETE SET DEFAULT ON UPDATE SET DEFAULT);
-- Insert a value in PKTABLE for default
INSERT INTO PKTABLE VALUES (-1, -2, 'The Default!');
-- Insert test data into PKTABLE
INSERT INTO PKTABLE VALUES (1, 2, 'Test1');
INSERT INTO PKTABLE VALUES (1, 3, 'Test1-2');
INSERT INTO PKTABLE VALUES (2, 4, 'Test2');
INSERT INTO PKTABLE VALUES (3, 6, 'Test3');
INSERT INTO PKTABLE VALUES (4, 8, 'Test4');
INSERT INTO PKTABLE VALUES (5, 10, 'Test5');
-- Insert successful rows into FK TABLE
INSERT INTO FKTABLE VALUES (1, 2, 4);
INSERT INTO FKTABLE VALUES (1, 3, 5);
INSERT INTO FKTABLE VALUES (2, 4, 8);
INSERT INTO FKTABLE VALUES (3, 6, 12);
INSERT INTO FKTABLE VALUES (NULL, NULL, 0);
-- Insert failed rows into FK TABLE
INSERT INTO FKTABLE VALUES (100, 2, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname2"
DETAIL:  Key (ftest1,ftest2)=(100,2) is not present in table "pktable".
INSERT INTO FKTABLE VALUES (2, 2, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname2"
DETAIL:  Key (ftest1,ftest2)=(2,2) is not present in table "pktable".
INSERT INTO FKTABLE VALUES (NULL, 2, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname2"
DETAIL:  MATCH FULL does not allow mixing of null and nonnull key values.
INSERT INTO FKTABLE VALUES (1, NULL, 4);
ERROR:  insert or update on table "fktable" violates foreign key constraint "constrname2"
DETAIL:  MATCH FULL does not allow mixing of null and nonnull key values.
-- Check FKTABLE
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      2 |      4
      1 |      3 |      5
      2 |      4 |      8
      3 |      6 |     12
        |        |      0
(5 rows)

-- Delete a row from PK TABLE
DELETE FROM PKTABLE WHERE ptest1=1 and ptest2=2;
-- Check FKTABLE to check for removal
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      2 |      4 |      8
      3 |      6 |     12
        |        |      0
     -1 |     -2 |      4
(5 rows)

-- Delete another row from PK TABLE
DELETE FROM PKTABLE WHERE ptest1=5 and ptest2=10;
-- Check FKTABLE (should be no change)
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      2 |      4 |      8
      3 |      6 |     12
        |        |      0
     -1 |     -2 |      4
(5 rows)

-- Update a row from PK TABLE
UPDATE PKTABLE SET ptest1=1 WHERE ptest1=2;
-- Check FKTABLE for update of matched row
SELECT * FROM FKTABLE;
 ftest1 | ftest2 | ftest3 
--------+--------+--------
      1 |      3 |      5
      3 |      6 |     12
        |        |      0
     -1 |     -2 |      4
     -1 |     -2 |      8
(5 rows)

-- this should fail for lack of CASCADE
DROP TABLE PKTABLE;
NOTICE:  constraint constrname2 on table fktable depends on table pktable
ERROR:  cannot drop table pktable because other objects depend on it
HINT:  Use DROP ... CASCADE to drop the dependent objects too.
DROP TABLE PKTABLE CASCADE;
NOTICE:  drop cascades to constraint constrname2 on table fktable
DROP TABLE FKTABLE;
--
-- First test, check with no on delete or on update
--
CREATE TABLE PKTABLE ( ptest1 int PRIMARY KEY, ptest2 text );
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "pktable_pkey" for table "pktable"
CREATE TABLE FKTABLE ( ftest1 int REFERENCES PKTABLE MATCH FULL, ftest2 int );
-- Insert test data into PKTABLE
INSERT INTO PKTABLE VALUES (1, 'Test1');
INSERT INTO PKTABLE VALUES (2, 'Test2');
INSERT INTO PKTABLE VALUES (3, 'Test3');
INSERT INTO PKTABLE VALUES (4, 'Test4');
INSERT INTO PKTABLE VALUES (5, 'Test5');
-- Insert successful rows into FK TABLE
INSERT INTO FKTABLE VALUES (1, 2);
INSERT INTO FKTABLE VALUES (2, 3);
INSERT INTO FKTABLE VALUES (3, 4);
INSERT INTO FKTABLE VALUES (NULL, 1);
-- Insert a failed row into FK TABLE
INSERT INTO FKTABLE VALUES (100, 2);
ERROR:  insert or update on table "fktable" violates foreign key constraint "fktable_ftest1_fkey"
DETAIL:  Key (ftest1)=(100) is not present in table "pktable".
-- Check FKTABLE
SELECT * FROM FKTABLE;
 ftest1 | ftest2 
--------+--------
      1 |      2
      2 |      3
      3 |      4
        |      1