Delete records based on the foreign keys of oracle 11 g

I have a requirement to remove the records from the tables in the order according to

the existing foreign keys.

I for example, the following tables and the pk, fk constraints:

create table one

(aa number (1),)

descr varchar2 (20));

ALTER table one

Add constraint a_pk key (aa) primary;

create table b

(aa number (1),)

descr varchar2 (20));

ALTER table b

Add constraint b_pk key (aa) primary;

create table c

(aa number (1),)

descr varchar2 (20));

ALTER table c

Add constraint c_pk key (aa) primary;

create table a2

(aa number (2),)

id_aa number (1).

descr varchar2 (20));

ALTER table a2

Add constraint a2_pk key (aa) primary;

ALTER table a2

Add constraint a2_fk foreign key (id_aa)

references a (aa);

create table b2

(aa number (2),)

id_aa number (1).

descr varchar2 (20));

ALTER table b2

Add constraint b2_pk key (aa) primary;

ALTER table b2

Add constraint b2_fk foreign key (id_aa)

references b (aa);

create table z

(aa number (3),)

id_aa number (1).

id_bb number (1).

descr varchar (20));

ALTER table z

Add constraint z_pk key (aa) primary;

ALTER table z

Add constraint z_fk1 foreign key (id_aa)

references a (aa);

ALTER table z

Add constraint z_fk2 foreign key (id_bb)

references b (aa);

So, I want to choose the names of the tables in such an order so as

deleting records will succeed...

I built the following sql query (using the recursive subquery factoring):

[p]

with q (r_constraint_name, table_name, constraint_name, lvl) as

(select table_name, constraint_name, r_constraint_name 1 lvl

from user_constraints one

where a.constraint_type = 'P '.

Union of all the

Select b.table_name b.constraint_name, b.r_constraint_name, q.lvl + 1 lvl

from user_constraints b

Join q

on (q.constraint_name = b.r_constraint_name)

where b.constraint_type = 'R '.

)

Select f.table_name, f.constraint_name, f.r_constraint_name, f.lvl

q f

[/ p]

I want the results as the following list:

Table-name

----------------

B2

A2

Z

A

B

C

The table - B2, A2, Z - (in any order) must first referred in the list

because they are based on the other three tables - A, B, C. Thus, in order to remove the

A, B, C table records the B2, A2, table Z records must be beleted first.

The query I posted above has the problem that it displays tables A2, B2 twice

(1 because they have a pk and 2 because they have fk referring A, B relatively tables).

Is there a solution for this problem?

Note: I use db11g v2

I wrote not all relationships of tables user_constraints (only argument constraint_name = r_constraint_name)

Thank you

SIM

I have a requirement to remove the records from the tables in the order according to

the existing foreign keys.

. . .

The table - B2, A2, Z - (in any order) must first referred in the list

because they are based on the other three tables - A, B, C. Thus, in order to remove the

A, B, C table records the B2, A2, table Z records must be beleted first.

Is there a solution for this problem?

Yes - the 'solution' is to use ON DELETE CASCADE, as appropriate or write a procedure that removes tables in the proper order.

The solution is NOT to try to use dynamic sql statements to do so.

You already know the good parent/child relationships. Simply create a procedure that uses the correct order.

Analyses are necessary in any case to determine the proper order AND press the appropriate values to use to remove the appropriate lines

Your DDL for tables and constraints must be in a version control system

Update the procedure when / if new constraints or tables are added to the application

IMHO, you must use dynamic SQL NOT to try to adjust automatically if a new constraint appears. New constraints should not appear by accident - they appear ONLY as part of a well planned release.

Tags: Database

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