外鍵和觸發器的啓停

一、禁止外鍵
ORACLE數據庫中的外鍵約束名都在表user_constraints中能夠查到。其中constraint_type=’R'表示是外鍵約束。
啓用外鍵約束的命令爲：alter table table_name enable constraint constraint_name
禁用外鍵約束的命令爲：alter table table_name disable constraint constraint_name
而後再用SQL查出數據庫中因此外鍵的約束名：
select ‘alter table ‘||table_name||’ enable constraint ‘||constraint_name||’;’ from user_constraints where constraint_type=’R’
select ‘alter table ‘||table_name||’ disable constraint ‘||constraint_name||’;’ from user_constraints where constraint_type=’R’

二、ORACLE禁用/啓用外鍵和觸發器
–啓用腳本
SET SERVEROUTPUT ON SIZE 1000000
BEGIN
for c in (select ‘ALTER TABLE ‘||TABLE_NAME||’ ENABLE CONSTRAINT ‘||constraint_name||’ ‘ as v_sql from user_constraints where CONSTRAINT_TYPE=’R') loop
DBMS_OUTPUT.PUT_LINE(C.V_SQL);
begin
EXECUTE IMMEDIATE c.v_sql;
exception when others then
dbms_output.put_line(sqlerrm);
end;
end loop;
for c in (select ‘ALTER TABLE ‘||TNAME||’ ENABLE ALL TRIGGERS ‘ AS v_sql from tab where tabtype=’TABLE’) loop
dbms_output.put_line(c.v_sql);
begin
execute immediate c.v_sql;
exception when others then
dbms_output.put_line(sqlerrm);
end;
end loop;
end;
/
commit;

–禁用腳本
SET SERVEROUTPUT ON SIZE 1000000
BEGIN
for c in (select ‘ALTER TABLE ‘||TABLE_NAME||’ DISABLE CONSTRAINT ‘||constraint_name||’ ‘ as v_sql from user_constraints where CONSTRAINT_TYPE=’R') loop
DBMS_OUTPUT.PUT_LINE(C.V_SQL);
begin
EXECUTE IMMEDIATE c.v_sql;
exception when others then
dbms_output.put_line(sqlerrm);
end;
end loop;
for c in (select ‘ALTER TABLE ‘||TNAME||’ DISABLE ALL TRIGGERS ‘ AS v_sql from tab where tabtype=’TABLE’) loop
dbms_output.put_line(c.v_sql);
begin
execute immediate c.v_sql;
exception when others then
dbms_output.put_line(sqlerrm);
end;
end loop;
end;
/
commit;