sqlite

sqlite returning nothing after 2nd cursor.fetchall()

由 与世无争的帅哥 提交于 2021-02-04 06:54:51
问题 Why do I get nothing when I execute cursor.fetchall() twice after a cursor.execute()? Is there anyway of preventing this from happening? Do I need to store the information on a variable? Is it suppose to work this way? 回答1: fetchall does what it says--it fetches all. There's nothing left after that. To get more results, you'd need to run another query (or the same query again). From the python db-api 2.0 specification: cursor.fetchall() Fetch all (remaining) rows of a query result, returning

sqlite returning nothing after 2nd cursor.fetchall()

由 余生颓废 提交于 2021-02-04 06:53:39
问题 Why do I get nothing when I execute cursor.fetchall() twice after a cursor.execute()? Is there anyway of preventing this from happening? Do I need to store the information on a variable? Is it suppose to work this way? 回答1: fetchall does what it says--it fetches all. There's nothing left after that. To get more results, you'd need to run another query (or the same query again). From the python db-api 2.0 specification: cursor.fetchall() Fetch all (remaining) rows of a query result, returning

解决Debian环境无法update更新源问题及更换阿里云镜像

由 ﹥＞﹥吖頭↗ 提交于 2021-02-04 00:38:32
无论我们是准备在VPS服务器中安装WEB环境，还是编译其他的软件功能，拿到VPS登录SSH之后我们肯定想到的先update环境这样可以确保服务器中的源是最新且还可以确保补丁最新。今天有在一台Debian环境中apt-get update更新源的时候有看到错误信息，而后肯定无法通过直接apt-get安装需要的软件（我需要安装SQLITE）。 从上图中可以看到源不通或者失效，所以才会有"E: Some index files failed to download, they have been ignored, or old ones used instead."的错误提示问题，那我们如何解决问题呢？ 如果我们也是Debian环境，那就修改 阿里云 源，这样可以解决这个问题，当然还有其他源比如163等，我们用户不管了，谁好用老左就用哪个。 第一、替换文件 /etc/apt/sources.list 第二、替换源内容 deb http://mirrors.aliyun.com/debian wheezy main contrib non-free deb-src http://mirrors.aliyun.com/debian wheezy main contrib non-free deb http://mirrors.aliyun.com/debian wheezy-updates

Pandas直接读取sql脚本

由 牧云@^-^@ 提交于 2021-02-02 21:54:05
小小明：「凹凸数据」专栏作者，Pandas数据处理高手，致力于帮助无数数据从业者解决数据处理难题。 之前有群友反应同事给了他一个几百MB的sql脚本，导入数据库再从数据库读取数据有点慢，想了解下有没有可以直接读取sql脚本到pandas的方法。 01 解析sql脚本文本文件替换成csv格式并加载 我考虑了一下sql脚本也就只是一个文本文件而已，而且只有几百MB，现代的机器足以把它一次性全部加载到内存中，使用python来处理也不会太慢。 我简单研究了一下sql脚本的导出格式，并根据格式写出了以下sql脚本的读取方法。 注意：该读取方法只针对SQLyog导出的mysql脚本测试，其他数据库可能代码需要根据实际情况微调。 读取方法： from io import StringIO import pandas as pd import re def read_sql_script_all (sql_file_path, quotechar= "'" ) -> (str, dict): insert_check = re.compile( r"insert +into +`?(\w+?)`?\(" , re.I | re.A) with open(sql_file_path, encoding= "utf-8" ) as f: sql_txt = f.read() end_pos = -1

Pandas直接读取sql脚本

由 我是研究僧i 提交于 2021-02-02 20:07:48
之前有群友反应同事给了他一个几百MB的sql脚本，导入数据库再从数据库读取数据有点慢，想了解下有没有可以直接读取sql脚本到pandas的方法。 01 解析sql脚本文本文件替换成csv格式并加载 我考虑了一下sql脚本也就只是一个文本文件而已，而且只有几百MB，现代的机器足以把它一次性全部加载到内存中，使用python来处理也不会太慢。 我简单研究了一下sql脚本的导出格式，并根据格式写出了以下sql脚本的读取方法。 注意：该读取方法只针对SQLyog导出的mysql脚本测试，其他数据库可能代码需要根据实际情况微调。 读取方法： from io import StringIO import pandas as pd import re def read_sql_script_all (sql_file_path, quotechar= "'" ) -> (str, dict): insert_check = re.compile( r"insert +into +`?(\w+?)`?\(" , re.I | re.A) with open(sql_file_path, encoding= "utf-8" ) as f: sql_txt = f.read() end_pos = -1 df_dict = {} while True : match_obj = insert

无法加载 DLL“SQLite.Interop.DLL”: 找不到指定的模块。 (异常来自 HRESULT:0x8007007E)。

由 爷，独闯天下 提交于 2021-02-02 11:59:20
无法加载 DLL“SQLite.Interop.DLL”: 找不到指定的模块。 (异常来自 HRESULT:0x8007007E)。 参考文章： （1）无法加载 DLL“SQLite.Interop.DLL”: 找不到指定的模块。 (异常来自 HRESULT:0x8007007E)。 （2）https://www.cnblogs.com/zd8866-it/p/7191028.html 备忘一下。 来源： oschina 链接： https://my.oschina.net/u/4438370/blog/4941373

Django website with sqlite db deployment on heroku

由 有些话、适合烂在心里 提交于 2021-02-02 03:46:50
问题 I have been reading at many places that Heroku doesn't support sqlite database. Is there no option to use sqlite? Is there any kind of wrapper or plug-in to be used with sqlite so that it can be deployed in Heroku? Can anyone share resources or guides to do the same end to end? 回答1: No, there is no way to do this. An sqlite database is a file on disk, but the filesystem on Heroku is ephemeral and not shared between dynos, so the db would be lost every time you deploy. But there is no reason

最新最全的sqlmap命令中文详解以及插件功能详解[最全]

由 女生的网名这么多〃 提交于 2021-01-30 14:50:14
前言:不知不觉已经上班已经三个星期,在公司一直在忙公司的事情,所以博客好久没更了,今天刚好有时间把前端时间刚翻译完的sqlmap全部命令发出来 　　　在公司里面主要做渗透测试,所以像sqlmap,nmap这些工具用的很多,但是全部命令都是英文的,这对非英语母语的人是很不友好的,所以就萌生了能不能把这些常用的工具的命令全部翻译出来,不仅方便了自己,也能方便一切其他人,所以利用上周的空闲时间把sqlmap全部的翻译完了,同时由于sqlmap很多命令讲的不清不楚的,试着尽量将命令讲的更清楚点,同时也把大部分的插件的功能详细介绍了一下,我有打算出一系列的这类资料,所以在我的github上面建立了一个远程仓,现在已经将sqlmap的上传上去了,以后还会有nmap,hydra等等 　　　　GitHub地址:https://github.com/spacesec/normaltool Sqlmap全部命令中文详解 ___ __H__ ___ ___[)]_____ ___ ___ {1.2.3.25#dev} |_ -| . ["] | .'| . | |___|_ [,]_|_|_|__,| _| |_|V |_| http://sqlmap.org Usage: sqlmap.py [options] Options: -h, --help Show basic help message

SQLite - two PK, one FK

由 末鹿安然 提交于 2021-01-29 22:09:29
问题 I'm designing a table that stores information about Disciplines - it allows a user to add records but I also need to be able to add records myself (which will appear to the user on an update). The problem of course is the auto-incrementing ID - if I launch the app with 9 listed and add a 10th discipline in an update, on my side it'll appear with the ID of 10, but they may have already created 20. It's obvious, basic stuff but if I instead split the data into seperate tables with the same

How to return first book published by each author?

由 旧时模样 提交于 2021-01-29 20:31:31
问题 The question is For each author, return the title and published_date of their first book. The result set should have five columns: author’s id, author’s name, book’s id, book’s title, and book’s published_date. So I have the ouput columns I want except its displaying every book by each author with the required items, how do I get it to only show the book with the earliest published_date? SELECT authors.id, authors.author, books.id, books.title, books.published_date FROM authors INNER JOIN
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