大约有 7,000 项符合查询结果(耗时:0.0196秒) [XML]

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“use database_name” command in PostgreSQL

... If I'm not mistaken, databases in MySQL are more akin to schemas in PostgreSQL -- you can switch between those, but DBs in PostgreSQL are a whole different ballgame. – mpen May 10 '12 at 3:40 ...
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How do you do a limit query in JPQL or HQL?

In Hibernate 3, is there a way to do the equivalent of the following MySQL limit in HQL? 14 Answers ...
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...将是一个灾难性的失败。 这个思维实验就包括考虑他们如何去做这件事情。下面是我们的思考: 1)第一位将军先发送一段消息“让我们在上午9点开始进攻”。然而,一旦信使被派遣,他是否通过了山谷,第一位将军就不得而...
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请停下来重新想下 你究竟为何创业? - 资讯 - 清泛网 - 专注C/C++及内核技术

...扯?这里不应该是创业成功者的鸡汤分享区么?比如你是如何拿到几亿美元的风投,或者起码要秀一下融资的雄心壮志吧?毕竟哪个心智正常的人会花费十几年的时间经营公司,却连想要吞并别人的野心都没有。 唔,我之所以...
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What is the difference between an ORM and an ODM?

...(Object Document Mapper) deals with documents. Am I right in assuming that mySQL is an example of ORM and MongoDB is a example of ODM? ...
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Simplest way to profile a PHP script

... all the data $select_query = "SELECT * FROM data_table"; $result = mysql_query($select_query); prof_flag("Retrieve data"); $rows = array(); $found_data=false; while($r = mysql_fetch_assoc($result)) { $found_data=true; $rows[] = $r; } prof_flag("Close DB"); ...
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How long is the SHA256 hash?

...+ salt, but I don't know how long to make my VARCHAR when setting up the MySQL database. What is a good length? 5 Answers...
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绘画动画组件 · App Inventor 2 中文网

...心,否则为 球形精灵 的最高点。 Z坐标 球形精灵应如何相对于其他球形精灵和图像精灵分层,编号较高的层位于编号较低的层之前。 事件 被碰撞时(其他精灵) 事件将在两个启用的精灵(球形精灵或图像精灵)碰撞...
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SQLAlchemy IN clause

...is using raw SQL mode with SQLAlchemy, I use SQLAlchemy 0.9.8, python 2.7, MySQL 5.X, and MySQL-Python as connector, in this case, a tuple is needed. My code listed below: id_list = [1, 2, 3, 4, 5] # in most case we have an integer list or set s = text('SELECT id, content FROM myTable WHERE id IN :...
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C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术

...y、stack、queue和priority_queue。 你是否关心容器中的元素是如何排序的?如果不关心,选择哈希容器. 容器中数据的布局是否需要和C兼容?如果需要兼容,就只能选择vector。(见第16条) 元素的查找速度是否是关键的考虑因素?如...