Error with forign key constraints

Question

hi
I have a .sql file which contains about 180 tables scripts . TO disable the contraints i ran the below script first
begin
for v in (select constraint_name, table_name from user_constraints where constraint_type = 'R')
loop
     execute immediate
     'alter table ' || v.table_name || ' disable constraint ' || v.constraint_name;
end loop;
end;
and then the .sql file by giving @filename.sql .Some of the scripts are getting executed but the one's having forign key references it is showing containt error foreign key check. but when i ran the above script ie the one to disable the foreign key check again and then ran each of these table scripts which showed error before manually it gets executed .why is this so? can anyone help me in solving this problem
Thanking you in advance
Dinny

Answer 1

I have a .sql file which contains table scripts and i some of these tables there is foreign key referencesing other tables so when i am ruuning the script it is showing such tables(ie the tables that i am refering to) is not existing for eg below is one of the script from the .sql file
create table t_system_groups (
group_id NUMBER(11) not null,
group_name VARCHAR2(255) not null,
group_desc VARCHAR2(255),
parent_id NUMBER(11) default '0',
full_path VARCHAR2(255) default NULL,
CONSTRAINT pk_group_id_t_system_groups PRIMARY KEY (group_id),
CONSTRAINT uk_group_name_t_system_groups UNIQUE (group_name),
CONSTRAINT fk_t_system_groups FOREIGN KEY (parent_id) REFERENCES t_system_groups (group_id) ON DELETE CASCADE
Since i have run the script for disabling the constraints before running the .sql file then why is it showing such as error. also showing errors with drop table having references
for eg:
SQL> begin
2 for v in (select constraint_name, table_name from user_constraints where constraint_type = 'R'
3 loop
4 execute immediate
5 'alter table ' || v.table_name || ' disable constraint ' || v.constraint_name;
6 end loop;
7
8 end;
9 /
PL/SQL procedure successfully completed.
SQL> drop table t_system_groups;
drop table t_system_groups
ERROR at line 1:
ORA-02449: unique/primary keys in table referenced by foreign keys
Regards
dinny