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常用Sql - 爬虫/数据库 - 清泛IT社区,为创新赋能!

本帖最后由 zqp2013 于 2015-3-17 22:06 编辑 mysql:drop table if exists tablename; 不能写成 drop table tablename if exists tablename; mysql:建立索引Sql CREATE TABLE tablename (   `ID`                 &nbs...
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PDO MySQL扩展模块 检测通不过? - PHP - 清泛IT论坛,有思想、有深度

...hp.in中下面两行已经放开注释: extension=pdo.so extension=pdo_mysql.so PDO检测仍然通不过。 终极解决方案: php编译时加上如下参数,重新编译安装php: --with-pdo-mysql php编译安装完整参数请参见:http://www.tsingfun.com/html/2015/env_0826/...
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How can I implement a tree in Python?

... self.right = None self.data = None You can use it like this: root = Tree() root.data = "root" root.left = Tree() root.left.data = "left" root.right = Tree() root.right.data = "right" If you need an arbitrary number of children per node, then use a list of children: class Tree: def...
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HAproxy - Web负载均衡解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术

... stats auth admin:password # 设置统计页面认证的用户和密码,如果要设置多个,另起一行写入即可 stats hide-version # 隐藏统计页面上的haproxy版本信息 frontend http_80_in # 定义一个名为http_80_in的前端部分 bind 0.0.0.0:80 ...
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Differences between utf8 and latin1

...w a bit Java). Note that full 4-byte UTF-8 support was only introduced in MySQL 5.5. Before that version, it only goes up to 3 bytes per character, not 4 bytes per character. So, it supported only the BMP plane and not e.g. the Emoji plane. If you want full 4-byte UTF-8 support, upgrade MySQL to at...
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How do I check if an index exists on a table field in MySQL?

... Use SHOW INDEX like so: SHOW INDEX FROM [tablename] Docs: https://dev.mysql.com/doc/refman/5.0/en/show-index.html share | improve this answer | follow | ...
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PHP 错误记录和聚合的平台Sentry实战 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...和聚合的平台Sentry实战不管你用什么编程语言,都会面临如何处理错误日志的问题。很多程序员对错误日志放任自流,直到出现故障了才追悔莫及,如果问我怎么办,我会...不管你用什么编程语言,都会面临如何处理错误日志的...
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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...导致加载和执行缓慢,所以我们就来看看Lint这个工具是如何发现优化这些问题的(当然了,Lint实际的功能是非常强大的,我们开发中也是经常使用它来发现一些问题的,这里主要有点针对UI性能的说明了,其他的雷同)。 在And...
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Run MySQLDump without Locking Tables

...ion, because it does not need to lock the tables at all. For innodb DB: mysqldump --single-transaction=TRUE -u username -p DB share | improve this answer | follow ...
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How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?

... The fastest MySQL solution, without inner queries and without GROUP BY: SELECT m.* -- get the row that contains the max value FROM topten m -- "m" from "max" LEFT JOIN topten b -- "b" from "...