查看建表语句

oracle数据库想要获取某个表的建表语句，我们可以用dbms_metadata.get_ddl这个包获取ddl语句

GET_DDL函数返回创建对象的原数据的DDL语句，详细参数如下：
– object_type —需要返回原数据的DDL语句的对象类型
– name — 对象名称
– schema —对象所在的Schema，默认为当前用户所在所Schema
– version —对象原数据的版本
– model —原数据的类型默认为Oracle
– transform. - XSL-T transform. to be applied.
– RETURNS: 对象的原数据默认以CLOB类型返回

dbms_metadata包中的get_ddl函数定义：
DBMS_METADATA.GET_DDL (
object_type IN VARCHAR2,
name IN VARCHAR2,
schema IN VARCHAR2 DEFAULT NULL,
version IN VARCHAR2 DEFAULT 'COMPATIBLE',
model IN VARCHAR2 DEFAULT 'ORACLE',
transform IN VARCHAR2 DEFAULT 'DDL')
RETURN CLOB;


下面以查看sys.aud$表的建表语句为例：

sys@ORCL>set pages 100 lines 200
sys@ORCL>set long 99999
sys@ORCL>select dbms_metadata.get_ddl('TABLE','AUD$','SYS') from dual;

DBMS_METADATA.GET_DDL('TABLE','AUD$','SYS')
--------------------------------------------------------------------------------

CREATE TABLE "SYS"."AUD$"
( "SESSIONID" NUMBER NOT NULL ENABLE,
"ENTRYID" NUMBER NOT NULL ENABLE,
"STATEMENT" NUMBER NOT NULL ENABLE,
"TIMESTAMP#" DATE,
"USERID" VARCHAR2(30),
"USERHOST" VARCHAR2(128),
"TERMINAL" VARCHAR2(255),
"ACTION#" NUMBER NOT NULL ENABLE,
"RETURNCODE" NUMBER NOT NULL ENABLE,
"OBJ$CREATOR" VARCHAR2(30),
"OBJ$NAME" VARCHAR2(128),
"AUTH$PRIVILEGES" VARCHAR2(16),
"AUTH$GRANTEE" VARCHAR2(30),
"NEW$OWNER" VARCHAR2(30),
"NEW$NAME" VARCHAR2(128),
"SES$ACTIONS" VARCHAR2(19),
"SES$TID" NUMBER,
"LOGOFF$LREAD" NUMBER,
"LOGOFF$PREAD" NUMBER,
"LOGOFF$LWRITE" NUMBER,
"LOGOFF$DEAD" NUMBER,
"LOGOFF$TIME" DATE,
"COMMENT$TEXT" VARCHAR2(4000),
"CLIENTID" VARCHAR2(64),
"SPARE1" VARCHAR2(255),
"SPARE2" NUMBER,
"OBJ$LABEL" RAW(255),
"SES$LABEL" RAW(255),
"PRIV$USED" NUMBER,
"SESSIONCPU" NUMBER,
"NTIMESTAMP#" TIMESTAMP (6),
"PROXY$SID" NUMBER,
"USER$GUID" VARCHAR2(32),
"INSTANCE#" NUMBER,
"PROCESS#" VARCHAR2(16),
"XID" RAW(8),
"AUDITID" VARCHAR2(64),
"SCN" NUMBER,
"DBID" NUMBER,
"SQLBIND" CLOB,
"SQLTEXT" CLOB,
"OBJ$EDITION" VARCHAR2(30)
) 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 "AUDIT_TS"
LOB ("SQLBIND") STORE AS BASICFILE (
TABLESPACE "AUDIT_TS" ENABLE STORAGE IN ROW CHUNK 8192 RETENTION
NOCACHE 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))
LOB ("SQLTEXT") STORE AS BASICFILE (
TABLESPACE "AUDIT_TS" ENABLE STORAGE IN ROW CHUNK 8192 RETENTION
NOCACHE 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))


sys@ORCL>