1.select * from (select * from tablename order by
dbms_random.value) where rownum<
N;注:dbms_random是一个可以生成随机数值或者字符串的程序包。value()是最常用的,value()的用法一般有两个种,第...
分类:
数据库 时间:
2014-05-23 07:12:52
阅读次数:
364
昨天做了一张卡,是用于解决SQL注入问题的。现在就把昨天学到和用到的内容总结一下吧:)1.
什么是SQL注入简单的说,SQL注入是一种攻击行为,恶意的向SQL语句中插入某些内容进而达到某些不好的目的。举个例子吧,就是:statement =
"SELECT * FROM users WHERE na...
分类:
数据库 时间:
2014-05-23 06:43:48
阅读次数:
418
I think everyone who is interested in ecommerce
development get familiar with Magento earlier or later. It’s a very popular
platform, where a lot of m...
分类:
其他好文 时间:
2014-05-22 00:35:05
阅读次数:
555
--第一种分页(TOP方式)--select * from T_Sys_User where
User_Id in (select top 10 User_Id from T_Sys_User where User_Id not in(select
top (10*0) User_Id from T...
分类:
数据库 时间:
2014-05-21 22:44:21
阅读次数:
485
【题目】
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
Each number in C may only be used once in the combination.
Note:
All numbers (including target) will be ...
分类:
其他好文 时间:
2014-05-21 15:55:25
阅读次数:
259
【题目】
Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
The same repeated number may be chosen from C unlimited number of times.
Note:
All numbers (including target) w...
分类:
其他好文 时间:
2014-05-21 15:21:28
阅读次数:
292
--将text替换成你要查找的内容
select name
from sysobjects o, syscomments s
where o.id = s.id
and text like '%text%'
and o.xtype = 'P'
--将text替换成你要查找的内容
SELECT ROUTINE_NAME, ROUTINE_DEFINITION
FROM INFO...
分类:
数据库 时间:
2014-05-21 14:50:04
阅读次数:
373
公司的数据库一直是sybase,用起来也挺好的,最新客户现场出现一个问题,数据无法传输了,看日志非常简单,一下就定位到了原因。
很简单,参数超过了2000个,因为这个功能是根据主表的主键查询子表,方法用的是where 主表id in (?,?,?,?……)方式,参数问号最多是是2000个,不过这就奇怪了,直接使用sql查询sybase,5000个参数也没问题,看来是jdbc驱动的问题了。...
分类:
数据库 时间:
2014-05-21 13:39:29
阅读次数:
463
【题目】
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
For example,
Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6.
The above elevation map is represente...
分类:
移动开发 时间:
2014-05-21 06:44:38
阅读次数:
359
File error 3219 occurs on Microsoft SQL servers
where you are attempting to improperly restore a database with the "Restore
Files and Filegroups" comm...
分类:
数据库 时间:
2014-05-21 03:36:02
阅读次数:
427