无法在Bluemix上的DashDB/DB2中的表上添加外键

当我在Bluemix上的DashDB（DB2）中创建一个表时，如下所示：

CREATE TABLE DEPARTMENT (
    depname CHAR (10) UNIQUE NOT NULL ,
    phone   INTEGER
  ) ;
ALTER TABLE DEPARTMENT ADD CONSTRAINT DEPARTMENT_PK PRIMARY KEY ( depname ) ;

CREATE TABLE EMPLOYEE (
    "EmpNr"          NUMERIC (3) UNIQUE NOT NULL ,
    empname         CHAR (20) ,
    depname         CHAR (10) ,
    EMPLOYEE2_title CHAR (20)
  );
ALTER TABLE EMPLOYEE ADD CONSTRAINT EMPLOYEE_PK PRIMARY KEY ( "EmpNr" ) ;

ALTER TABLE EMPLOYEE ADD CONSTRAINT EMPLOYEE_DEPARTMENT_FK FOREIGN KEY (depname ) REFERENCES DEPARTMENT ( depname ) ;

---

Bluemix不允许为此表类型添加外键约束。

默认情况下，在Bluemix上创建DashDB表是“按列组织的”。。。

这也将不允许为此表类型添加外键约束

要添加FKs，请将

按行组织

添加到

创建表

语句中：

CREATE TABLE DEPARTMENT (
    depname CHAR (10) UNIQUE NOT NULL ,
    phone   INTEGER
  ) ORGANIZE BY ROW;

ALTER TABLE DEPARTMENT 
 ADD CONSTRAINT DEPARTMENT_PK PRIMARY KEY ( depname ) ;

CREATE TABLE EMPLOYEE (
    "EmpNr"          NUMERIC (3) UNIQUE NOT NULL ,
    empname         CHAR (20) ,
    depname         CHAR (10) ,
    EMPLOYEE2_title CHAR (20)
  ) ORGANIZE BY ROW;

ALTER TABLE EMPLOYEE 
 ADD CONSTRAINT EMPLOYEE_PK PRIMARY KEY ( "EmpNr" ) ;

ALTER TABLE EMPLOYEE 
 ADD CONSTRAINT EMPLOYEE_DEPARTMENT_FK FOREIGN KEY (depname )
 REFERENCES DEPARTMENT ( depname ) ;

ALTER TABLE EMPLOYEE 
 ADD CONSTRAINT EMPLOYEE_DEPARTMENT_FK FOREIGN KEY (depname ) 
 REFERENCES DEPARTMENT ( depname ) NOT ENFORCED;

当您查看（而不是DB2）时，您会注意到可以创建外键。但是，默认情况下，表是按列组织创建的。仅支持非强制引用约束。在您的示例中，您需要在语句中添加“未强制执行”：

CREATE TABLE DEPARTMENT (
    depname CHAR (10) UNIQUE NOT NULL ,
    phone   INTEGER
  ) ORGANIZE BY ROW;

ALTER TABLE DEPARTMENT 
 ADD CONSTRAINT DEPARTMENT_PK PRIMARY KEY ( depname ) ;

CREATE TABLE EMPLOYEE (
    "EmpNr"          NUMERIC (3) UNIQUE NOT NULL ,
    empname         CHAR (20) ,
    depname         CHAR (10) ,
    EMPLOYEE2_title CHAR (20)
  ) ORGANIZE BY ROW;

ALTER TABLE EMPLOYEE 
 ADD CONSTRAINT EMPLOYEE_PK PRIMARY KEY ( "EmpNr" ) ;

ALTER TABLE EMPLOYEE 
 ADD CONSTRAINT EMPLOYEE_DEPARTMENT_FK FOREIGN KEY (depname )
 REFERENCES DEPARTMENT ( depname ) ;

ALTER TABLE EMPLOYEE 
 ADD CONSTRAINT EMPLOYEE_DEPARTMENT_FK FOREIGN KEY (depname ) 
 REFERENCES DEPARTMENT ( depname ) NOT ENFORCED;

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谢谢如果我的表是由JPA创建的，我该怎么做？