1、查詢表和列的註釋信息
select t3.table_name,
t3.comments,
t1.COLUMN_NAME,
t2.comments,
t1.DATA_TYPE || '(' || decode(t1.DATA_TYPE,
'',
t1.DATA_PRECISION + t1.DATA_SCALE,
t1.data_length) || ')'
from user_tab_cols t1, user_col_comments t2, user_tab_comments t3
where t1.TABLE_NAME = t2.table_name(+)
and t1.COLUMN_NAME = t2.column_name(+)
and t1.TABLE_NAME = t3.table_name(+)
and lower(t1.TABLE_NAME) = 'user';
執行該語句使用當前用戶執行；
在PL/SQLdeveloper中查詢出來之後，全選右鍵選擇導出到excel即可。
2、查詢創建表的語句
set pagesize 0
set long 90000
set echo off
spool getdll.sql
select dbms_metadata.get_ddl('TABLE','TAB_NAME','SCOTT') from dual;
第一個參數：object_type,第二個參數：object_name，第三個參數：schema
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;
若是某個schema下的對象則：
set pagesize 0
set long 90000
set echo off
spool getdll.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;
獲取某個SCHEMA的建全部對象（包括存儲過程、包、函數、）的語法
select DBMS_METADATA.GET_DDL('PROCEDURE',u.object_name) from user_objects u where object_type = 'PROCEDURE';
select DBMS_METADATA.GET_DDL('SEQUENCE',u.object_name) from user_objects u where object_type = 'SEQUENCE';
select DBMS_METADATA.GET_DDL('TRIGGER',u.object_name) from user_objects u where object_type = 'TRIGGER';
select DBMS_METADATA.GET_DDL('PACKAGE',u.object_name) from user_objects u where object_type = 'PACKAGE';
select DBMS_METADATA.GET_DDL('FUNCTION',u.object_name) from user_objects u where object_type = 'FUNCTION';
dbms_metadata.get_dll的用法
--GET_DDL: Return the metadata for a single object as DDL.
-- This interface is meant for casual browsing (e.g., from SQLPlus)
-- vs. the programmatic OPEN / FETCH / CLOSE interfaces above.
-- PARAMETERS:
-- object_type - The type of object to be retrieved.
-- name - Name of the object.
-- schema - Schema containing the object. Defaults to
-- the caller's schema.
-- version - The version of the objects' metadata.
-- model - The object model for the metadata.
-- transform. - XSL-T transform. to be applied.
-- RETURNS: Metadata for the object transformed to DDL as a CLOB.
FUNCTION 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;
3、導出
expdp system/oracle directory=exp_dir dumpfile=getdll.dmp content=metadata_only schemas=etarde log=logfile.log
4、查詢一個用戶的所有表的結構信息的SQL語句
select a.table_name as 表名,user_tab_comments.comments as 表名備註,a.column_name as 列名,
a.data_type as 類型,
decode(a.data_type, 'NUMBER', a.data_precision, a.data_length) as 長度,
a.data_scale as 小數位數,
f.comments as 註釋,
a.nullable as 是否允許空,
a.data_default as 缺省值,
decode(e.key, 'Y', 'Y', 'N') as 外鍵
from user_tab_columns a,user_col_comments f,user_tab_comments,
(select b.table_name,
b.index_name,
b.uniqueness,
c.column_name,
decode(d.constraint_name, 'R', 'Y', 'N') key
from user_indexes b,
user_ind_columns c,
(select constraint_name
from user_constraints
where constraint_type = 'P') d
where b.index_name = c.index_name
and b.index_name = d.constraint_name(+)) e
where a.table_name = e.table_name(+)
and a.column_name = e.column_name(+)
and a.table_name = f.table_name
and a.column_name = f.column_name
and a.table_name = user_tab_comments.table_name
--and a.table_name = 'T_EDR_CON'
--and a.table_name not in('PLAN_TABLE','T_COMMAND_PARAM')
order by a.table_name
