oracle中查询、禁用、启用、删除表外键

1.查询所有表的外键的:
select table_name, constraint_name from user_constraints where constraint_type = 'R';
 
2.禁用所有外键约束, 使用下面的sql生成对应sql脚本:
select 'alter table ' || table_name || ' disable constraint ' || constraint_name || ';' from user_constraints where constraint_type = 'R';
生成的sql类似下面的语句:
alter table BERTH disable constraint BERTH_FK;
alter table BOLLARD disable constraint BOLLARD_FK;
alter table YARD_UNAVAIL_REGION disable constraint YARD_UNAVAIL_REGION_FK;
 
3.启用所有外键约束, 使用下面的sql生成对应sql脚本:
select 'alter table ' || table_name || ' enable constraint ' || constraint_name || ';' from user_constraints where constraint_type = 'R';
生成的sql类似下面的语句:
alter table BERTH enable constraint BERTH_FK;
alter table BOLLARD enable constraint BOLLARD_FK;
alter table YARD_UNAVAIL_REGION enable constraint YARD_UNAVAIL_REGION_FK;
 
4.删除所有外键约束, 使用下面的sql生成对应sql脚本:
select 'alter table ' || table_name || ' drop constraint ' || constraint_name || ';' from user_constraints where constraint_type = 'R';
生成的sql类似下面的语句:
alter table BERTH drop constraint BERTH_FK;
alter table BOLLARD drop constraint BOLLARD_FK;
alter table YARD_UNAVAIL_REGION drop constraint YARD_UNAVAIL_REGION_FK;
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