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error 'there is already an open datareader associated with this command which must be closed first'
This can be easily solved by allowing MARS in your connection string. AddMultipleActiveResultSets=trueto the provider part of your connection string (...
分类:其他好文   时间:2014-09-02 12:16:14    阅读次数:178
跟踪oracle中sql语句执行过程及相关知识拓展
select * from v$sqlarea;         可以跟踪sql语句的执行过程,如果想跟踪某个时间点前后的语句,可以通过first_load_time时间进行控制。 select * from v$sqlarea where first_load_time>'2010-11-27/09:30:00';        这个方法查询结果每条记录显示一条查询语句,且只能查询sql_t...
分类:数据库   时间:2014-09-02 10:33:44    阅读次数:270
git
Create a new repository on the command linetouch README.mdgit initgit add README.mdgit commit -m "first commit"git remote add origin https://github.co...
分类:其他好文   时间:2014-09-02 01:33:03    阅读次数:230
cocos2d 动作回调函数
// on "init" you need to initialize your instancebool HelloWorld::init(){ ////////////////////////////// // 1. super init first if ( !CCLayer...
分类:其他好文   时间:2014-09-02 00:05:53    阅读次数:304
First Missing Positive
Given an unsorted integer array, find the first missing positive integer.For example,Given [1,2,0] return 3,and [3,4,-1,1] return 2.Your algorithm sho...
分类:其他好文   时间:2014-09-01 22:19:33    阅读次数:190
next_permutation函数
头文件: algorithm参数: next_permutation(first,last) next_permutation(first,last,cmp)first,last为两个iterator,分别指向目标的头和尾,cmp是一个bool函数,接受两个目标序列值,返回boolne...
分类:其他好文   时间:2014-09-01 20:52:23    阅读次数:294
【python】入门学习(二)
键盘读取字符串:name = input('What is your first name?').strip()print("Hello " + name.capitalize() + "!")input():从键盘获取字符串 若要获取数字必须使用类型转换strip():删除字符串开始和结尾多余的空...
分类:编程语言   时间:2014-09-01 19:09:43    阅读次数:195
Inheritance vs. Composition in Java
This article illustrates the concepts of inheritance vs. composition in Java. It first shows an example of inheritance, and then shows how to improve the inheritance design by using composition. Ho...
分类:编程语言   时间:2014-09-01 17:59:03    阅读次数:379
Pascal's Triangle
问题描述 Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] ...
分类:其他好文   时间:2014-09-01 17:48:03    阅读次数:158
PostgreSQL data同步工具【pg_rewind】
pg_rewind is a tool for synchronizing a PostgreSQL data directory with another PostgreSQL data directory that was forked from the first one. The result is equivalent to rsyncing the first data directory with the second one. The advantage of pg_rewind over ...
分类:数据库   时间:2014-09-01 17:44:53    阅读次数:495
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