在更新表的主键字段或DELETE数据时，如果遇到ORA-02292: integrity constraint (xxxx) violated - child record found 这个是因为主外键关系，下面借助一个小列子来描述一下这个错误：

SQL> create table student
  2  (
  3    id  number,
  4    name nvarchar2(12),
  5    constraint pk_student primary key(id) 
  6  );


Table created.
QL> create table grades
  2  (  id  number ,
  3     subject nvarchar2(12),
  4     scores number,
  5     constraint pk_grades primary key(id ,subject),
  6     constraint fk_student_id foreign key(id) references student(id)
  7  );


Table created.


SQL> insert into student
  2  values(1001,'kerry');


1 row created.


SQL> insert into student
  2  values(1002,'jimmy');


1 row created.


SQL> commit;


Commit complete.


SQL> insert into grades
  2  values(1001, 'math', 120);


1 row created.


SQL> insert into grades
  2  values(1001, 'english', 106);


1 row created.


SQL> commit;


Commit complete.


SQL> update student set id=1004 where name='kerry';
update student set id=1004 where name='kerry'
*
ERROR at line 1:
ORA-02292: integrity constraint (TEST.FK_STUDENT_ID) violated - child record
found




SQL>

 

ORA-02292: integrity constraint (xxxx) violated - child record found_外键约束

 

 

遇到这种情况，首先找到外键约束和相关表，禁用外键约束，处理数据，然后启用外键约束。

SELECT OWNER, CONSTRAINT_NAME, TABLE_NAME 
FROM DBA_CONSTRAINTS 
WHERE CONSTRAINT_NAME=&CONSTRAINT_NAME;


SELECT OWNER, CONSTRAINT_NAME, TABLE_NAME 
FROM USER_CONSTRAINTS 
WHERE CONSTRAINT_NAME=&CONSTRAINT_NAME;




SQL> ALTER TABLE TEST.GRADES DISABLE CONSTRAINT FK_STUDENT_ID;


Table altered.


SQL> update student set id=1004 where name='kerry';


1 row updated.




SQL> update grades set id=1004 where id =1001;


2 rows updated.


SQL> commit;


Commit complete.


SQL> ALTER TABLE TEST.GRADES ENABLE CONSTRAINT FK_STUDENT_ID;


Table altered.


SQL>

 

 

如果是删除数据遇到这种情况，可以先删除子表数据，然后删除父表数据。

SQL> delete from student where id=1004;
delete from student where id=1004
*
ERROR at line 1:
ORA-02292: integrity constraint (TEST.FK_STUDENT_ID) violated - child record
found




SQL> delete from grades
  2  where id in
  3  ( select id from student
  4    where id=1004);


2 rows deleted.


SQL> delete from student where id=1004;


1 row deleted.


SQL> commit;


Commit complete.


SQL>