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This article mainly introduces the use of mysql to achieve oracle connect by function methods, the contents of the article are carefully selected and edited by the author, with a certain pertinence, for everyone's reference significance is still relatively great, the following with the author to understand the use of mysql to achieve oracle connect by function method.

1. Generate test tables and data:

Create table mytest

(

Id int primary key

Nodename varchar (20)

Pid int

);

Insert into mytest (id,nodename,pid) values (2, 'Bamboo, 1)

Insert into mytest (id,nodename,pid) values (4, 'Downs, 2)

Insert into mytest (id,nodename,pid) values (5, 'Egg, 2)

Insert into mytest (id,nodename,pid) values (6, 'Fitch, 3)

Insert into mytest (id,nodename,pid) values (8, 'Houses, 0)

Insert into mytest (id,nodename,pid) values (9, 'Irene, 8)

Insert into mytest (id,nodename,pid) values (10, 'Jacks, 8)

Insert into mytest (id,nodename,pid) values (12, 'Little, 9)

Insert into mytest (id,nodename,pid) values (13, 'Manners, 9)

Insert into mytest (id,nodename,pid) values (14, 'Numart 12)

Insert into mytest (id,nodename,pid) values (15, 'Olympiad 12)

Insert into mytest (id,nodename,pid) values (17,'QQ id,nodename,pid 15)

two。 Create a function:

Delimiter $$

CREATE FUNCTION `getParentList` (rootId VARCHAR (50)) RETURNS VARCHAR (1000)

BEGIN

DECLARE sParentList VARCHAR (1000)

DECLARE sParentTemp VARCHAR (1000)

SET sParentTemp = CAST (rootId AS CHAR)

WHILE sParentTemp IS NOT NULL DO

IF (sParentList IS NOT NULL) THEN

SET sParentList = CONCAT (sParentTemp,'/',sParentList)

ELSE

SET sParentList = CONCAT (sParentTemp)

END IF

SELECT GROUP_CONCAT (pid) INTO sParentTemp FROM mytest WHERE FIND_IN_SET (id,sParentTemp) > 0

END WHILE

RETURN sParentList

END$$

DELIMITER

3. Test verification:

Set global log_bin_trust_function_creators=1

SELECT id,pid,getParentList (id) FROM mytest

Mysql > SELECT id,pid,getParentList (id) FROM mytest

+-- +

| | id | pid | getParentList (id) |

+-- +

| | 1 | 0 | 0 amp 1 |

| | 2 | 1 | 0 / 1 / 2 |

| | 4 | 2 | 0qqqlash 2ap4 |

| | 5 | 2 | 0amp 1amp 2Accord 5 |

| | 6 | 3 | 0 / 1 / 3 | 3 / 6 |

| | 7 | 6 | 0qqq1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |

| | 8 | 0 | 0 amp 8 |

| | 9 | 8 | 0 / 8 / 8 / 9 |

| | 10 | 8 | 0 / 8 | 8 / 10 |

| | 11 | 8 | 0 / 8 / 8 / 11 |

| | 13 | 9 | 0ram, 8amp, 9tick | |

| | 15 | 12 | 0qq8 / 9x12 / 15 |

| | 16 | 15 | 0qq8 / 9x12 / 15 / 16 |

| | 17 | 15 | 0qq8 / 9x12 / 15 / 17 |

+-- +

17 rows in set (0.01 sec)

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