从Oracle9i开始Oracle提供了一个新的系统包DBMS_METADATA,可以用于提取对象创建的DDL语句。
这个Package功能极其强大,我们来看看它的使用方法.
1.获得表的创建语句.
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> |
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2.进一步的,可以通过dbms_metadata获得更全面的DDL语句
Oracle提供一个全面的范例: $ORACLE_HOME/rdbms/demo/mddemo.sql 包括索引、授权、触发器等所有DDL语句都可以被提取。
有兴趣的可以参考该文件,按照Demo的例子进行测试。
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