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JDBC中的Statement和PreparedStatement的区别
以Oracle为例吧 Statement为一条Sql语句生成执行计划, 如果要执行两条sql语句 select colume from table where colume=1; select colume from table where colume=2; 会生成两个执行计划 一千个查询就生成一千个执行计划! PreparedStatement用于使用绑定变量重用执行计划 ...
分类:数据库   时间:2014-05-22 13:44:55    阅读次数:380
如何使用oracle 的DBMS_SQLTUNE package 来运行 Sql Tuning Advisor 进行sql 自动调优
如何使用oracle 的DBMS_SQLTUNE package 来运行 Sql Tuning Advisor 进行sql 自动调优 1》。这里简单举个例子来说明DBMS_SQLTUNE 的使用 首先现执行下某个想要调优的sql,然后获取sqlid SQL> select * from v$sqltext where sql_text like 'select * from dua...
分类:数据库   时间:2014-05-22 10:47:51    阅读次数:328
泛型类及方法的基本使用
1、定义 public class EntBase:where T: new() { public List GetListDemo() { var lst = new List(); for (int i = 1; i...
分类:其他好文   时间:2014-05-22 03:35:38    阅读次数:166
在where子句中经常使用的运算符
比较运算符> = = 大于、小于、大于(小于)等于、不等于BETWEEN ...AND...显示在某一区间的值IN(set)显示在in列表中的值,例:in(100,200)LIKE ‘张pattern’模糊查询 _ %IS NULL判断是否为空逻辑运算符and &&多个条件同时成立or ||多...
分类:其他好文   时间:2014-05-22 00:51:48    阅读次数:658
Advices and Best Practices for Magento developers
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
SQL分页
--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
SQL 检索所有存储过程中是否包含某字符
--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
poj 3735 Training little cats(矩阵快速幂)
Description Facer's pet cat just gave birth to a brood of little cats. Having considered the health of those lovely cats, Facer decides to make the cats to do some exercises. Facer has well designe...
分类:其他好文   时间:2014-05-21 10:36:57    阅读次数:297
LeetCode: Trapping Rain Water [041]
【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
How to Restore File Error 3219 on Microsoft SQL Servers
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
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