ORACLE学习实例总结

笔名：北方天空<1>成功导入数据库1imp userdb/missraintest file=userdb.dmp full=y log=userdb_imp.logimp dictdb/missraintest file=dictdb.dmp full=y log=dictdb_imp.logimp appdb/missraintest file=appdb.dmp full=y log=appdb_imp.logimp tmmsdict/missraintest file=tmmsdict.dmp full=y log=tmmsdict_imp.logimp tmmsapp/missraintest file=tmmsapp.dmp full=y log=tmmsapp_imp.logimp userdb/missraintest file=userdb.dmp full=y log=userdb_imp.log中imp:导入命令userdb：用户名missrain：密码test：服务命名userdb.dmp：数据库文件userdb_imp.log：数据库日志full=y：全部导入<2>成功创建表1create table test(a varchar(128) default wu,b int default 0)<3>成功创建存储过程1 CREATE OR REPLACE procedure pro1 as begin insert into test values(afa,3); end;<4>成功创建存储过程2 CREATE OR REPLACE procedure pro1 as begin declare a varchar2(128); b int; begin select * into a,b from test where a=afa; end; end;<5>成功创建存储过程3create or replace procedure pro2 as begin execute immediate select * from test;end;<6>成功创建存储过程4create or replace procedure pro2 as begin execute immediate insert into test(a,b) values(3,2);end;<7>成功创建触发器11、 建立试验表 create table employees_copy as select * from tt;2、 建立日志表 create table employees_log( who varchar2(30), when date); 3、 在employees_copy表上建立语句触发器，在触发器中填充employees_log 表。 Create or replace trigger biud_employee_copy Before insert or update or delete On employees_copy Begin Insert into employees_log( Who,when) Values( user, sysdate); End; 4、 测试 update employees_copy set a=fsd;(tt表中有a字段)<8>成功创建触发器21、 建立试验表 create table employees_copy as select * from tt;2、 建立日志表 create table employees_log( who varchar2(30), when date); 3、 在employees_copy表上建立语句触发器，在触发器中填充employees_log 表。 Create or replace trigger biud_employee_copy After insert or update or delete On employees_copy Begin Insert into employees_log( Who,when) Values( user, sysdate); End; 4、 测试 update employees_copy set a=fsd;(tt表中有a字段)<9>成功使用游标1declare name1 varchar2(39); cursor mycur is select a from test; begin open mycur; loop fetch mycur into name1; exit when mycur%notfound ; DBMS_OUTPUT.PUT_LINE(name1); end loop; close mycur; end;<10>成功使用游标2 declare cursor mycur is select a from test; name1 varchar2(39); begin open mycur; loop fetch mycur into name1; exit when mycur%notfound ; DBMS_OUTPUT.PUT_LINE(name1); end loop; close mycur; end;<11>常用sql语句1正在看的ORACLE教程是:oracle常用sql语句。SQL*Plus system/manager 2、显示当前连接用户 SQL> show user 3、查看系统拥有哪些用户 SQL> select * from all_users; 4、新建用户并授权 SQL> create user a identified by a;（默认建在SYSTEM表空间下） SQL> grant connect,resource to a; 5、连接到新用户 SQL> conn a/a 6、查询当前用户下所有对象 SQL> select * from tab; 7、建立第一个表 SQL> create table a(a number); 8、查询表结构 SQL> desc a 9、插入新记录 SQL> insert into a values(1); 10、查询记录 SQL> select * from a; 11、更改记录 SQL> update a set a=2; 12、删除记录 SQL> delete from a; 13、回滚 SQL> roll; SQL> rollback; 14、提交 SQL> commit; 用户授权: GRANT ALTER ANY INDEX TO "user_id " GRANT "dba " TO "user_id " ALTER USER "user_id " DEFAULT ROLE ALL 创建用户: CREATE USER "user_id " PROFILE "DEFAULT " IDENTIFIED BY " DEFAULT TABLESPACE "USERS " TEMPORARY TABLESPACE "TEMP " ACCOUNT UNLOCK; GRANT "CONNECT " TO "user_id " 用户密码设定: ALTER USER "CMSDB " IDENTIFIED BY "pass_word " 表空间创建: CREATE TABLESPACE "table_space " LOGGING DATAFILE C:ORACLEORADATAdbstable_space.ora SIZE 5M - 1、查看当前所有对象 SQL > select * from tab; 2、建一个和a表结构一样的空表 SQL > create table b as select * from a where 1=2; SQL > create table b(b1,b2,b3) as select a1,a2,a3 from a where 1=2; 3、察看数据库的大小，和空间使用情况 SQL > col tablespace format a20 SQL > select b.file_id文件ID, b.tablespace_name表空间, b.file_name物理文件名, b.bytes总字节数, (b.bytes-sum(nvl(a.bytes,0)已使用, sum(nvl(a.bytes,0)剩余, sum(nvl(a.bytes,0)/(b.bytes)*100剩余百分比 from dba_free_space a,dba_data_files b where a.file_id=b.file_id group by b.tablespace_name,b.file_name,b.file_id,b.bytes order by b.tablespace_name / dba_free_space -表空间剩余空间状况 dba_data_files -数据文件空间占用情况 4、查看现有回滚段及其状态 SQL > col segment format a30 SQL > SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,SEGMENT_ID,FILE_ID,STATUS FROM DBA_ROLLBACK_SEGS; 5、查看数据文件放