一个存储过程

Becky — Wed, 17 May 2006 09:35:00 GMT

create or replace procedure backup_cl_user is
  tablename varchar2 ( 40 );
  last_date varchar2 ( 8 );
  str_sql varchar2 ( 500 );
begin
   select to_char(sysdate, ' yyyymm ' ) into tablename from dual;
  tablename: = ' service_reg_cl_ ' || tablename;
   select to_char(sysdate - 60 , ' yyyymmdd ' ) into last_date from dual;
  str_sql: = ' insert into ' || tablename || ' select * from service_reg_cl where state= '' 60H '' and unreg_date< ''' || last_date || ''' ' ;
  dbms_output.put_line(str_sql);
   execute immediate str_sql;
   commit ;

  str_sql: = ' delete from service_reg_cl where state= '' 60H '' and unreg_date< ''' || last_date || '''' ;
  dbms_output.put_line(str_sql);
   execute immediate str_sql;
   commit ;
end backup_cl_user;

这个存储过程的作用是把表里面60天以前的一些记录搬到另外一张表里面去。我们的设计是每个月一张表，所以表名是要动态生成的，需要用到execute immediate，其他就没有什么了。

Becky 2006-05-17 17:35 发表评论

SQLServer和Oracle的常用函数

Becky — Thu, 12 Jan 2006 09:09:00 GMT

1.绝对值
S:select abs(-1) value
O:select abs(-1) value from dual

2.取整(大)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual

3.取整(小)
S:select floor(-1.001) value
O:select floor(-1.001) value from dual

4.取整(截取)
S:select cast(-1.002 as int) value
O:select trunc(-1.002) value from dual

5.四舍五入
S:select round(1.23456,4) value 1.23460
O:select round(1.23456,4) value from dual 1.2346

6.e为底的幂
S:select Exp(1) value 2.7182818284590451
O:select Exp(1) value from dual 2.71828182

7.取e为底的对数
S:select log(2.7182818284590451) value 1
O:select ln(2.7182818284590451) value from dual; 1

8.取10为底对数
S:select log10(10) value 1
O:select log(10,10) value from dual; 1

9.取平方
S:select SQUARE(4) value 16
O:select power(4,2) value from dual 16

10.取平方根
S:select SQRT(4) value 2
O:select SQRT(4) value from dual 2

11.求任意数为底的幂
S:select power(3,4) value 81
O:select power(3,4) value from dual 81

12.取随机数
S:select rand() value
O:select sys.dbms_random.value(0,1) value from dual;

13.取符号
S:select sign(-8) value -1
O:select sign(-8) value from dual -1

Becky 2006-01-12 17:09 发表评论

BlogJava-程序的优雅之美-随笔分类-数据库

一个存储过程

SQLServer和Oracle的常用函数