dbms_metadata用法

dbms_metadata包中的get_ddl函数

1.得到一个表或索引的ddl语句

SELECT DBMS_METADATA.GET_DDL('TABLE','DEPT','SCOTT') FROM DUAL;

select dbms_metadata.get_ddl('INDEX','PK_DEPT','SCOTT') from dual;

2.得到一个用户下的所有表，索引，存储过程的ddl

SELECT DBMS_METADATA.GET_DDL(U.OBJECT_TYPE, u.object_name)
FROM USER_OBJECTS u
where U.OBJECT_TYPE IN ('TABLE','INDEX','PROCEDURE');

存储过程：查看 存储过程 的定义语句

SQL> SET LONG 9999
SQL> select dbms_metadata.get_ddl('PROCEDURE','ANALYZEDB','NEWCCS') from dual;
  CREATE OR REPLACE PROCEDURE "NEWCCS"."ANALYZEDB"
IS
   CURSOR get_ownertable
   IS
      SELECT table_name
        FROM user_tables;
   ownertable   get_ownertable%ROWTYPE;
BEGIN
   OPEN get_ownertable;
   LOOP
      FETCH get_ownertable
       INTO ownertable;
      EXIT WHEN get_ownertable%NOTFOUND;
      EXECUTE IMMEDIATE    'analyze table '
                        || ownertable.table_name
                        || ' compute statistics for table for all indexes for all indexed  columns';
   END LOOP;
EXCEPTION
   WHEN OTHERS
   THEN
      RAISE;
END;

3.得到所有表空间的ddl语句

SELECT DBMS_METADATA.GET_DDL('TABLESPACE', TS.tablespace_name)
FROM DBA_TABLESPACES TS;

4.得到所有创建用户的ddl

SELECT DBMS_METADATA.GET_DDL('USER',U.username)
FROM DBA_USERS U;

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9i  中可以利用DBMS_METADATA.GET_DDL包得到数据库的对象的ddl脚本。如下（SQLPLUS中执行）：

a. 获取单个的建表、视图和建索引的语法

set pagesize 0
set long 90000
set feedback off
set echo off
spool DEPT.sql
select dbms_metadata.get_ddl('TABLE','TAB_NAME','SCOTT') from dual;
select dbms_metadata.get_ddl('VIEW','VIEW_NAME','SCOTT') from dual;
select dbms_metadata.get_ddl('INDEX','IDX_NAME','SCOTT') from dual;
spool off;
  
b.获取一个SCHEMA下的所有建表、视图和建索引的语法，以scott为例：
 
set pagesize 0
set long 90000
set feedback off
set echo off
spool schema.sql
connect scott/tiger;
SELECT DBMS_METADATA.GET_DDL('TABLE',u.table_name) FROM USER_TABLES u;
SELECT DBMS_METADATA.GET_DDL('VIEW',u.VIEW_name) FROM USER_VIEWS u;
SELECT DBMS_METADATA.GET_DDL('INDEX',u.index_name) FROM USER_INDEXES u;
spool off;

c.    获取某个SCHEMA的建全部存储过程的语法
 
set pagesize 0
set long 90000
set feedback off
set echo off
spool procedures.sql 
select   DBMS_METADATA.GET_DDL('PROCEDURE',u.object_name) from     user_objects u where     object_type = 'PROCEDURE';
spool off;

d.    获取某个SCHEMA的建全部函数的语法
 
set pagesize 0
set long 90000
set feedback off
set echo off
spool function.sql 
select   DBMS_METADATA.GET_DDL('FUNCTION',u.object_name) from     user_objects u where     object_type = 'FUNCTION';
spool off;