Oracle 表和约束的DDL

团队，

我正在使用SQL开发人员17.3和SQLCL 17.3进行此演示。

当从SQLCL做DDL时，我们得到了这个

demo@ORA11G> show ddl
STORAGE : ON
INHERIT : ON
SQLTERMINATOR : ON
OID : ON
SPECIFICATION : ON
TABLESPACE : ON
SIZE_BYTE_KEYWORD : ON
PRETTY : ON
REF_CONSTRAINTS : ON
FORCE : ON
PARTITIONING : ON
CONSTRAINTS : ON
INSERT : ON
BODY : ON
CONSTRAINTS_AS_ALTER : ON
SEGMENT_ATTRIBUTES : ON
demo@ORA11G>
demo@ORA11G> ddl EMP table

  CREATE TABLE "DEMO"."EMP"
   (    "EMPNO" NUMBER(4,0),
        "ENAME" VARCHAR2(10),
        "JOB" VARCHAR2(9),
        "MGR" NUMBER(4,0),
        "HIREDATE" DATE,
        "SAL" NUMBER(7,2),
        "COMM" NUMBER(7,2),
        "DEPTNO" NUMBER(2,0),
         CONSTRAINT "EMP_PK" PRIMARY KEY ("EMPNO")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA"  ENABLE,
         CONSTRAINT "EMP_FK" FOREIGN KEY ("DEPTNO")
          REFERENCES "DEMO"."DEPT" ("DEPTNO") ENABLE
   ) SEGMENT CREATION IMMEDIATE
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA" ;

  CREATE INDEX "DEMO"."EMP_IDX" ON "DEMO"."EMP" ("ENAME")
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA" ;
demo@ORA11G>

同时从SQL开发人员导出DDL得到了这个。(在SQL Developer中检查了以下选项-漂亮的打印，终止符，存储，显示架构，向视图添加力，添加字节关键字)

--------------------------------------------------------
--  File created - Monday-October-16-2017   
--------------------------------------------------------
--------------------------------------------------------
--  DDL for Table EMP
--------------------------------------------------------

  CREATE TABLE "DEMO"."EMP" 
   ( "EMPNO" NUMBER(4,0), 
 "ENAME" VARCHAR2(10 BYTE), 
 "JOB" VARCHAR2(9 BYTE), 
 "MGR" NUMBER(4,0), 
 "HIREDATE" DATE, 
 "SAL" NUMBER(7,2), 
 "COMM" NUMBER(7,2), 
 "DEPTNO" NUMBER(2,0)
   ) SEGMENT CREATION IMMEDIATE 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
 NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA" ;
--------------------------------------------------------
--  DDL for Index EMP_IDX
--------------------------------------------------------

  CREATE INDEX "DEMO"."EMP_IDX" ON "DEMO"."EMP" ("ENAME") 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA" ;
--------------------------------------------------------
--  DDL for Index EMP_PK
--------------------------------------------------------

  CREATE UNIQUE INDEX "DEMO"."EMP_PK" ON "DEMO"."EMP" ("EMPNO") 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA" ;
--------------------------------------------------------
--  Constraints for Table EMP
--------------------------------------------------------

  ALTER TABLE "DEMO"."EMP" ADD CONSTRAINT "EMP_PK" PRIMARY KEY ("EMPNO")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TS_DATA"  ENABLE;

问题:

1) 约束EMP_FK在SQL开发人员中缺失，但在SQLCL中可用
2) 如何仅获取DDL命令中的FK约束-尝试了以下命令，但这无济于事。

demo@ORA11G> DDL EMP_FK REF_CONSTRAINTS
Object REF_CONSTRAINTS EMP_FK not found
demo@ORA11G>
demo@ORA11G> DDL EMP_FK CONSTRAINTS
Object CONSTRAINTS EMP_FK not found
demo@ORA11G>

1) 我无法复制。我做到了

工具 => 数据库导出 => 导出DDL。保留所有默认值



我的DDL在底部带有ref约束

--------------------------------------------------------
--  Ref Constraints for Table EMP
--------------------------------------------------------

  ALTER TABLE "SCOTT"."EMP" ADD CONSTRAINT "EMP_FK" FOREIGN KEY ("DEPTNO")
   REFERENCES "SCOTT"."DEPT" ("DEPTNO") ENABLE;

2) 看起来可能是一个遗漏。“旧时尚” 的方式可以作为一种变通方法，即

SQL> select  dbms_metadata.get_ddl('REF_CONSTRAINT','EMP_DEPT_FK') from dual;

DBMS_METADATA.GET_DDL('REF_CONSTRAINT','EMP_DEPT_FK')
--------------------------------------------------------------------------------

  ALTER TABLE "HR"."EMPLOYEES" ADD CONSTRAINT "EMP_DEPT_FK" FOREIGN KEY ("DEPART
MENT_ID")
          REFERENCES "HR"."DEPARTMENTS" ("DEPARTMENT_ID") ENABLE