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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...
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/...
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...
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
...
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...
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
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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...
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...
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
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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 "...
