[置顶] oracle 快速查询数据库各种信息、及转换对应java代码

1 查询表中数据量

select 'select '||''''||t.TABLE_NAME||''''||' as table_name, count(*) from '|| t.TABLE_NAME||' union' from user_tables t ;

2 查询数据库中锁表和解锁

详细见： http://blog.csdn.net/pioayang/article/details/10108671

SELECT /*+ rule */ s.username,
decode(l.type,'TM','TABLE LOCK',
'TX','ROW LOCK',
NULL) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
FROM v$session s,v$lock l,dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT Null

--kill session语句
alter system kill session'50,492';
--以下几个为相关表
SELECT * FROM v$lock;
SELECT * FROM v$sqlarea;
SELECT * FROM v$session;
SELECT * FROM v$process ;
SELECT * FROM v$locked_object;
SELECT * FROM all_objects;
SELECT * FROM v$session_wait;

--1.查出锁定object的session的信息以及被锁定的object名

SELECT l.session_id sid, s.serial#, l.locked_mode,l.oracle_username,
l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY sid, s.serial# ;

--2.查出锁定表的session的sid, serial#,os_user_name, machine name, terminal和执行的语句

--比上面那段多出sql_text和action
SELECT l.session_id sid, s.serial#, l.locked_mode, l.oracle_username, s.user#,
l.os_user_name,s.machine, s.terminal,a.sql_text, a.action
FROM v$sqlarea a,v$session s, v$locked_object l
WHERE l.session_id = s.sid
AND s.prev_sql_addr = a.address
ORDER BY sid, s.serial#;

--3.查出锁定表的sid, serial#,os_user_name, machine_name, terminal，锁的type,mode

SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
s.terminal, s.logon_time, l.type
FROM v$session s, v$lock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;

3 查询表中注释及列的注释

详细见 http://blog.csdn.net/pioayang/article/details/11248235

select t3.table_name,t3.comments,t2.comments,t1.COLUMN_NAME
       ,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';

4 查看表空间（查看路径、修改、创建）

详细见 http://blog.csdn.net/pioayang/article/details/10924423

1 查看表空间路径

select * from dba_data_files;

2 修改表空间大小

ALTER TABLESPACE MAXDATA ADD DATAFILE '/oradata/XX/MAXDATA02.DBF' SIZE 1000M;

可以通过PL/SQL查看。
1. 查看所有表空间大小
 select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name;
2. 未使用的表空间大小
select tablespace_name,sum(bytes)/1024/1024 from dba_free_space group by tablespace_name; 

查看当前用户每个表占用空间的大小：
Select   Segment_Name,Sum(bytes)/1024/1024   From   User_Extents   Group   By   Segment_Name

3.创建表空间

-- 创建 DZJC 表空间
CREATE SMALLFILE TABLESPACE "LHCZW" DATAFILE 'F:\oracle\product\10.2.0\oradata\LH\LHCZW' SIZE 100M AUTOEXTEND ON NEXT 100M MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO ;
-- 创建 DZJC_INDEX 表空间
CREATE SMALLFILE TABLESPACE "LHCZW_INDEX" DATAFILE 'F:\oracle\product\10.2.0\oradata\LH\LHCZW_index' SIZE 100M AUTOEXTEND ON NEXT 50M MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO ;
-- 创建 DZJC_TEMP 表空间
CREATE SMALLFILE TEMPORARY TABLESPACE "LHCZW_TEMP" TEMPFILE 'F:\oracle\product\10.2.0\oradata\LH\LHCZW_temp' SIZE 100M AUTOEXTEND ON NEXT 25M MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;

-- 创建 DZJC 用户
CREATE USER "LHCZW" PROFILE "DEFAULT" IDENTIFIED BY "123456" DEFAULT TABLESPACE "LHCZW" TEMPORARY TABLESPACE "LHCZW_TEMP" ACCOUNT UNLOCK;
GRANT "CONNECT" TO "LHCZW" WITH ADMIN OPTION;
GRANT "DBA" TO "LHCZW" WITH ADMIN OPTION;

5 转换java代码（javaEE   hiberanate1）

详细见：http://blog.csdn.net/pioayang/article/details/11252409

--数据库中字段java代码

select col.TABLE_NAME,replace(initcap(col.TABLE_NAME),'_', '')
  , 'private '||decode(k.DATA_TYPE, 'VARCHAR2', 'String', 'NUMBER', 'java.lang.Integer', 'DATE', 'java.sql.Timestamp','CHAR', 'String', k.DATA_TYPE)||' '|| lower(col.COLUMN_NAME)||';//'||com.comments
  , '<property name="'||lower(col.COLUMN_NAME)||'" column="'||lower(col.COLUMN_NAME)||'" type="'
  ||decode(k.DATA_TYPE, 'VARCHAR2', 'java.lang.String', 'NUMBER', 'java.lang.Integer', 'DATE', 'java.sql.Timestamp','CHAR', 'String', k.DATA_TYPE)||'"/>'
  from user_tab_columns k , user_tab_columns col
 inner join user_col_comments com
   on col.TABLE_NAME = com.TABLE_NAME
   and col.COLUMN_NAME = com.COLUMN_NAME
   and com.table_name like '%T_JC_NEW_ZFCG_%'
   and replace(initcap(col.TABLE_NAME),'_', '') like '%TJcNewZfcgZjjbxx%'
 where k.TABLE_NAME=col.TABLE_NAME and k.COLUMN_NAME=col.COLUMN_NAME and k.COLUMN_ID=col.COLUMN_ID
 order by col.TABLE_NAME, col.COLUMN_ID