违反 - 未找到父键错误

Question

我在我的数据库中有这两个表，DEPT1和EMP1对雇主部门和雇主列表有所帮助，表EMP1包含一个名为refdept的外键。 我的问题是我可以将数据插入DEPT1但不能插入EMP1，这是我得到的异常：

instanciation de la connexion connexion1
nov. 17, 2014 7:54:12 PM tp.dao.DeptDAO create
Infos:  create new instance
nov. 17, 2014 7:54:13 PM tp.dao.DeptDAO create
Infos: New instance is created.
nov. 17, 2014 7:54:13 PM tp.dao.DeptDAO create
Infos: Return Result == true
nov. 17, 2014 7:54:13 PM tp.dao.EmpDAO create
Infos:  create new instance
nov. 17, 2014 7:54:13 PM tp.dao.EmpDAO create
Grave: ORA-02291: integrity constraint (BASE.FK_DEPT) violated - parent key not found

java.sql.SQLIntegrityConstraintViolationException: ORA-02291: integrity constraint (base.FK_DEPT) violated - parent key not found

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:440)    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:440)
l'employéEMP5est ajouté à cet département
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:837)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:445)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:191)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:523)
    at oracle.jdbc.driver.T4CCallableStatement.doOall8(T4CCallableStatement.java:204)
    at oracle.jdbc.driver.T4CCallableStatement.executeForRows(T4CCallableStatement.java:1007)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1315)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3576)
    at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3657)
    at oracle.jdbc.driver.OracleCallableStatement.executeUpdate(OracleCallableStatement.java:4739)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1350)
    at tp.dao.EmpDAO.create(EmpDAO.java:48)
    at tp.TP.main(TP2.java:84)
nov. 17, 2014 7:54:13 PM tp.dao.EmpDAO create
Infos: Return Result == false
nov. 17, 2014 7:54:13 PM tp.dao.EmpDAO create
Infos: Return Result == false

我试过了：

insert into base.EMP1(ide,nome,rue,ville,refdept) values (7,"EMP5","agadir","dddd",(select idd from base.DEPT1 where nomd ='Math'));

我收到此错误：

Error code 984, SQL state 42000: ORA-00984: column not allowed here

任何帮助请求和感谢:(

Answer 1

  

ORA-02291：违反了完整性约束（BASE.FK_DEPT） - 找不到父密钥

DEPT1中没有这样的值，请先检查一下。

  

插入base.EMP1（ide，nome，rue，ville，refdept）值（7，“EMP5”，“agadir”，“dddd”，（从base.DEPT1中选择idd，其中nomd ='Math'）） ;

试试这个：

insert into base.EMP1(ide,nome,rue,ville,refdept)
select 7,'EMP5','agadir','dddd', idd from base.DEPT1 where nomd ='Math';

Answer 2

看起来您在DEPT1中没有 idd 列

尝试：

insert into base.EMP1(ide,nome,rue,ville,refdept) values (7,"EMP5","agadir","dddd",(select ido from base.DEPT1 where nomd ='Math'));

Answer 3

我认为你应该这样试试：

insert into base.EMP1(ide,nome,rue,ville,refdept) values (7,'EMP5','agadir','dddd',
(select idd from base.DEPT1 where nomd ='Math'));