ORA-02292: integrity constraint (xxxx) violated - child record found

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> 

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>