DIRECT BY EYGLE.
從ORACLE9I開始Oracle提供了一個新的系統包DBMS_METADATA，可以用於提取對象創建的DDL語句。
這個Package功能極其強大，我們來看看它的使用方法.
1.獲得表的創建語句.
SQL> desc dbms_metadata
FUNCTION ADD_TRANSFORM RETURNS NUMBER
...
FUNCTION GET_DDL RETURNS CLOB
Argument Name Type In/Out Default?
------------------------------ ----------------------- ------ --------
OBJECT_TYPE VARCHAR2 IN
NAME VARCHAR2 IN
SCHEMA VARCHAR2 IN DEFAULT
VERSION VARCHAR2 IN DEFAULT
MODEL VARCHAR2 IN DEFAULT
TRANSFORM VARCHAR2 IN DEFAULT
....
SQL> set long 2000
SQL> select dbms_metadata.get_ddl('TABLE','TEST') from dual;
DBMS_METADATA.GET_DDL('TABLE','TEST')
--------------------------------------------------------------------------------
CREATE TABLE "SYS"."TEST"
( "OWNER" VARCHAR2(30),
"OBJECT_NAME" VARCHAR2(128),
"SUBOBJECT_NAME" VARCHAR2(30),
"OBJECT_ID" NUMBER,
"DATA_OBJECT_ID" NUMBER,
"OBJECT_TYPE" VARCHAR2(18),
"CREATED" DATE,
"LAST_DDL_TIME" DATE,
"TIMESTAMP" VARCHAR2(19),
"STATUS" VARCHAR2(7),
"TEMPORARY" VARCHAR2(1),
"GENERATED" VARCHAR2(1),
"SECONDARY" VARCHAR2(1)
) 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)
TABLESPACE "SYSTEM"
SQL>
2.進一步的，可以通過dbms_metadata獲得更全面的DDL語句
Oracle提供一個全面的範例:
$ORACLE_HOME/rdbms/demo/mddemo.sql
包括索引、授權、觸發器等所有DDL語句都可以被提取。
SQL> CREATE USER A IDENTIFIED BY A;
用戶已創建
SQL> select dbms_metadata.get_ddl('USER','A') from dual;
DBMS_METADATA.GET_DDL('USER','A')
------------------------------------------------------------------
CREATE USER "A" IDENTIFIED BY VALUES 'AFCC9478DFBF9029'
TEMPORARY TABLESPACE "TEMP"
有興趣的可以參考該文件，按照Demo的例子進行測試。
SQL> select dbms_metadata.get_ddl('TABLE','IUFO.IUFO_USERINFO') FROM DUAL;
ERROR:
ORA-31603: object "IUFO.IUFO_USERINFO" of type TABLE not found in schema "SYS"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 105
ORA-06512: at "SYS.DBMS_METADATA_INT", line 2917
ORA-06512: at "SYS.DBMS_METADATA_INT", line 3302
ORA-06512: at "SYS.DBMS_METADATA_INT", line 4189
ORA-06512: at "SYS.DBMS_METADATA", line 326
ORA-06512: at "SYS.DBMS_METADATA", line 410
ORA-06512: at "SYS.DBMS_METADATA", line 449
ORA-06512: at "SYS.DBMS_METADATA", line 615
ORA-06512: at "SYS.DBMS_METADATA", line 1221
ORA-06512: at line 1
no rows selected
SQL> CONN IUFO/UFSOFT4460895
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
SQL> CONN IUFO/ufsoft2157923
SP2-0734: unknown command beginning "CONN..." - rest of line ignored.
SQL> CONNECT IUFO/ufsoft2157923
Connected.
SQL> SELECT DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO') FROM DUAL;
SQL> SELECT DBMS_METADATA.GET_DDL('TA." - rest of line ignored. DUAL;
SQL> 734: unknown command beginning "
SQL> SELECT DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO') FROM DUAL;
DBMS_METADATA.GET_DDL('TABLE',
--------------------------------------------------------------------------------
CREATE TABLE "IUFO"."IUFO_USERINFO"
( "USER_ID" VARCHAR2(20) NOT NULL ENA
SQL> COL DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO') FROMAT A100;
SP2-0158: unknown COLUMN option "FROMAT"
SQL> COLUMN DBMS_METADATA.GET_DDL FORMAT A100;
SQL> COL DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO') FORMAT A100;
SQL> SELECT DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO') FROM DUAL;
DBMS_METADATA.GET_DDL('TABLE',
--------------------------------------------------------------------------------
CREATE TABLE "IUFO"."IUFO_USERINFO"
( "USER_ID" VARCHAR2(20) NOT NULL ENA
SQL> SET LONG 3000
SQL> SET PAGESIZE 100
SQL> SELECT DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO') FROM DUAL;
DBMS_METADATA.GET_DDL('TABLE',
--------------------------------------------------------------------------------
CREATE TABLE "IUFO"."IUFO_USERINFO"
( "USER_ID" VARCHAR2(20) NOT NULL ENABLE,
"USER_CODE" VARCHAR2(64) NOT NULL ENABLE,
"USER_NAME" VARCHAR2(64) NOT NULL ENABLE,
"PASSWORD" VARCHAR2(128),
"ROLE" NUMBER(4,0),
"UNIT_ID" VARCHAR2(64),
"EMAIL" VARCHAR2(128),
CONSTRAINT "PK_IUFO_USERINFO" PRIMARY KEY ("USER_ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "IUFO" ENABLE,
CONSTRAINT "FK_USER_INFO" FOREIGN KEY ("UNIT_ID")
REFERENCES "IUFO"."IUFO_UNIT_INFO" ("UNIT_ID") ENABLE
) 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)
TABLESPACE "IUFO"
SQL> CONNECT /AS SYSDBA
Connected.
SQL> SHOW USER
USER is "SYS"
SQL> SELECT DBMS_METADATA.GET_DDL('TABLE','IUFO_USERINFO','IUFO') FROM DUAL;
DBMS_METADATA.GET_DDL('TABLE',
--------------------------------------------------------------------------------
CREATE TABLE "IUFO"."IUFO_USERINFO"
( "USER_ID" VARCHAR2(20) NOT NULL ENABLE,
"USER_CODE" VARCHAR2(64) NOT NULL ENABLE,
"USER_NAME" VARCHAR2(64) NOT NULL ENABLE,
"PASSWORD" VARCHAR2(128),
"ROLE" NUMBER(4,0),
"UNIT_ID" VARCHAR2(64),
"EMAIL" VARCHAR2(128),
CONSTRAINT "PK_IUFO_USERINFO" PRIMARY KEY ("USER_ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "IUFO" ENABLE,
CONSTRAINT "FK_USER_INFO" FOREIGN KEY ("UNIT_ID")
REFERENCES "IUFO"."IUFO_UNIT_INFO" ("UNIT_ID") ENABLE
) 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)
TABLESPACE "IUFO"
SQL>