oracle用户的权限管理

 
  1 创建表空间及临时表空间  
 
 
  create 
  tablespace csdn1 datafile  
  'csdn1' 
  size 
  30m autoextend  
  on 
  ;  
 
 
  create 
  temporary 
  tablespace csdn2 tempfile  
  'csdn2' 
  size 
  30m autoextend  
  on 
  ;  
 
 
     
 
 
  2 创建用户指定表空间及临时表空间  
 
 
  create 
  user 
  csdn identified  
  by 
  csdn  
  default 
  tablespace csdn1  
  temporary 
  tablespace csdn2;  
 
 
     
 
 
  3 授予用户各种权利  
 
 
  grant 
  create 
  session  
  to 
  csdn;  
 
 
  grant 
  unlimited tablespace  
  to 
  csdn;  
 
 
  grant 
  connect 
  to 
  csdn;  
 
 
  grant 
  resource  
  to 
  csdn;  
 
 
  grant 
  create 
  sequence 
  to 
  csdn;  
 
 
  grant 
  create 
  table 
  to 
  csdn;  
 
 
     
 
 
  4 查询当前用户的权限  
 
 
  select 
  *  
  from 
  user_sys_privs;  
 
 
     
 
 
  5 撤销用户各种权限  
 
 
  revoke 
  create 
  table 
  from 
  csdn;  
 
 
  revoke 
  create 
  session  
  from 
  csdn;  
 
 
  revoke 
  create 
  sequence 
  to 
  csdn;  
 
 
  revoke 
  resource  
  to 
  csdn;  
 
 
  revoke 
  connect 
  to 
  csdn;  
 
 
  revoke 
  unlimited tablespace  
  to 
  csdn;  
 
 
     
 
 
  6 通过角色来赋予用户各种权限  
 
 
  create 
  user 
  root identified  
  by 
  root  
  default 
  tablespace csdn1  
  temporary 
  tablespace csdn2;  
 
 
  create 
  role role1;  
 
 
  grant 
  create 
  table 
  to 
  role1;  
 
 
  grant 
  create 
  session  
  to 
  role1;  
 
 
  grant 
  connect 
  to 
  role1;  
 
 
  grant 
  resource  
  to 
  role1;  
 
 
  grant 
  create 
  sequence 
  to 
  role1;  
 
 
     
 
 
  (1) 将角色赋予给用户  
 
 
  grant 
  role1  
  to 
  root;  
 
 
     
 
 
  (2) 删除角色  
 
 
  drop 
  role role1;  
 
 
     
 
 
  7 序列  
 
 
  create 
  sequence 
  xulie  
 
 
  minvalue 1  
 
 
  maxvalue 222222  
 
 
  start  
  with 
  1  
 
 
  increment  
  by 
  1  
 
 
  nocache  
 
 
  nocycle  
 
 
     
 
 
  ----csdn Login---------  
 
 
  1 创建表  
 
 
  drop 
  table 
  tb_book;  
 
 
  create 
  table 
  tb_book  
 
 
  (  
 
 
  book_id  
  int 
  primary 
  key 
  not 
  null 
  ,  
 
 
  book_name  
  varchar 
  (32)  
  not 
  null 
  ,  
 
 
  book_des  
  varchar 
  (100)  
  not 
  null 
 
 
  );  
 
 
     
 
 
  2 通过序列来插入数据  
 
 
  insert 
  into 
  tb_book(book_id,book_name,book_des)  
  values 
  (xulie.nextval, 
  '计算机科学与技术' 
  , 
  '计算机' 
  );  
 
 
  insert 
  into 
  tb_book(book_id,book_name,book_des)  
  values 
  (xulie.nextval, 
  '信息管理技术' 
  , 
  '信管' 
  );  
 
 
  insert 
  into 
  tb_book(book_id,book_name,book_des)  
  values 
  (xulie.nextval, 
  '专业英语' 
  , 
  '外语' 
  );  
 
 
  insert 
  into 
  tb_book(book_id,book_name,book_des)  
  values 
  (xulie.nextval, 
  '土木工程建设' 
  , 
  '土木' 
  );  
 
 
  select 
  *  
  from 
  tb_book;  
 
 
     
 
 
  3 创建学生表  
 
 
  create 
  table 
  tb_student  
 
 
  (  
 
 
  stu_id  
  int 
  primary 
  key 
  not 
  null 
  ,  
 
 
  stu_name  
  varchar 
  (32)  
  not 
  null 
  ,  
 
 
  stu_sex  
  char 
  (2)  
  not 
  null 
  check 
  (stu_sex  
  in 
  ( 
  '男' 
  , 
  '女' 
  )),  
 
 
  stu_age  
  int 
  not 
  null 
 
 
  );  
 
 
     
 
 
  4 更改表的别名  
 
 
  rename tb_student  
  to 
  tb_stu;  
 
 
     
 
 
  5 创建借书记录表  
 
 
  create 
  table 
  tb_borrow  
 
 
  (  
 
 
  borrow_id  
  int 
  primary 
  key 
  not 
  null 
  ,  
 
 
  stu_id  
  int 
  not 
  null 
  ,  
 
 
  book_id  
  int 
  not 
  null 
 
 
  );  
 
 
  rename tb_borrow  
  to 
  tb_j;  
 
 
  alter 
  table 
  tb_j  
  add 
  constraint 
  b_b  
  foreign 
  key 
  (book_id)  
  references 
  tb_book(book_id);  
 
 
  alter 
  table 
  tb_j  
  add 
  constraint 
  b_s  
  foreign 
  key 
  (stu_id)  
  references 
  tb_stu(stu_id);  
 
 
     
 
 
     
 
 
     
 
 
  6 查询语句  
 
 
  列出所有借书的记录号 书名 借书的人名  
 
 
  select 
  j.borrow_id,s.stu_name,b.book_name  
  from 
  tb_stu s,tb_book b,tb_j j  
  where 
  s.stu_id=j.stu_id  
  and 
  b.book_id=j.book_id;  
 
 
     
 
 
  列出同一个专业 但是借了不同一本书的学生  
 
 
  select 
  s.zhuanye,s.stu_name,b.book_name  
  from 
  tb_book b,tb_stu s  
  order 
  by 
  s.zhuanye,b.book_name;  
 
 
     
 
 
  7 数值函数  
 
 
  select 
  ceil(13.2)  
  from 
  tb_stu;  
  --向上取整  
 
 
  select 
  floor(12.9)  
  from 
  tb_stu; 
  --向下取整  
 
 
  select 
  power(9,19)  
  from 
  tb_stu; 
  --9的19次方  
 
 
  select 
  sqrt(8)  
  from 
  tb_stu;     
  --8的平方根  
 
 
  select 
  sign(-2)  
  from 
  tb_stu;    
  --正数返1 负数返-1 0返0  
 
 
  select 
  trunc(12.232323123,5)  
  from 
  tb_stu; 
  --取5位小数  
 
 
  select 
  round(1232.343,2)  
  from 
  tb_stu; 
  --小数位为2 四舍五入  
 
 
  select 
  exp(3)  
  from 
  tb_stu;  
  --求指数  
 
 
  select 
  mod(12,8)  
  from 
  tb_stu;  
  --求余数  
 
 
  select 
  ln(10)  
  from 
  tb_stu; 
  --自然对数  
 
 
  select 
  log(10,100)  
  from 
  tb_stu; 
  --以10为底 100的对数  
 
 
  select 
  vsize(1010)  
  from 
  tb_stu; 
  --返回1010所占空间的大小  
 
 
     
 
 
    
  8 常用的函数  
 
 
  select 
  initcap(stu_name)  
  from 
  tb_stu; 
  --首字符转换成大写  
 
 
  select 
  stu_name,instr(stu_name, 
  's' 
  )  
  from 
  tb_stu; 
  --查找s在stu_name中的位置 返回相应的值(0 n)  
 
 
  select 
  length(stu_name)  
  from 
  tb_stu; 
  --返回长度  
 
 
  select 
  upper 
  (stu_name)  
  from 
  tb_stu; 
  --换大写  
 
 
  select 
  lower 
  (stu_name)  
  from 
  tb_stu; 
  --换小写  
 
 
  select 
  lpad(stu_name,11, 
  'Hello' 
  )  
  from 
  tb_stu; 
  --长度不够则在左边填充Hello 直到够11 
 
oracle用户的权限管理

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