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Hibernate 检索策略
概述 检索数据时的2个问题:不浪费内存:当Hibernate从数据库中加载Customer对象时,如果同时加载所有关联的Order对象,而程序实际上仅仅需要访问Customer对象,那么那些关联的Order对象就白白浪费了许多内存更好的查询效率:发送尽可能少的SQL语句Hibernate的检索策略....
分类:Web程序   时间:2014-11-30 15:29:18    阅读次数:148
大数据表查询或者分页
单表select a.id from a where type=1 order by idforeach 组合成 (20,3,69)形式select a.title,a.id from a in(组合形式)id 铸件索引 type普通索引多表select a.cid,b,id from a inne...
分类:其他好文   时间:2014-11-30 13:56:42    阅读次数:149
【LeetCode】Convert Sorted Array to Binary Search Tree
Convert Sorted Array to Binary Search TreeGiven an array where elements are sorted in ascending order, convert it to a height balanced BST.这题思路参照Conve...
分类:其他好文   时间:2014-11-29 20:07:35    阅读次数:178
leetcode Binary Tree Level Order Traversal II
是这题的变种对一棵树从最后一次开始层次遍历,并返回结果。例如:Given binary tree{3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7return its bottom-up level order traversal as:[ ...
分类:其他好文   时间:2014-11-29 15:57:28    阅读次数:251
php 对二维数组的某个字段公用排序的方法
function array_sort($arr ,$keys,$order=0){ if(!is_array($arr)){ return false; } $keysvalue=array(); foreach ($arr as $key=>$val){ $keysvalue[$key]=...
分类:编程语言   时间:2014-11-29 15:44:11    阅读次数:130
Leetcode-Remove Element
Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't mat...
分类:其他好文   时间:2014-11-29 10:12:55    阅读次数:167
Leetcode-Binary Tree Level Order Traversal
Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tree {3...
分类:其他好文   时间:2014-11-29 07:06:01    阅读次数:191
[LeetCode] Add Two Numbers 两个数字相加
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ...
分类:其他好文   时间:2014-11-29 06:59:16    阅读次数:153
Leetcode-binary Tree Zigzag Level Order Traversal
Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and ...
分类:其他好文   时间:2014-11-29 06:40:34    阅读次数:167
[LeetCode] Sort Colors 只有3个类型的排序
Given an array withnobjects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, wh...
分类:编程语言   时间:2014-11-28 21:17:07    阅读次数:353
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