Squirrel | Squirrel is a fuzzer for database managment systems | Database library
kandi X-RAY | Squirrel Summary
kandi X-RAY | Squirrel Summary
Squirrel is a fuzzer that aims at finding memory corruption issues in database managment systems (DBMSs). It is built on AFL. More details can be found in our CCS 2020 paper. And the bugs found by Squirrel can be found in here.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Squirrel
Squirrel Key Features
Squirrel Examples and Code Snippets
Community Discussions
Trending Discussions on Squirrel
QUESTION
I am tasked to parse (and transform) a code of a computer language, that has a slight quirk in its rules, at least I see it this way. To be exact, the compiler treats new lines (as well as semicolons) as statement separators, but other than that (e.g. inside the statement) it treats them as spacers (whitespace).
As an example, this code:
...ANSWER
Answered 2021-May-29 at 00:22The relevant quote from the "specification" is this:
A squirrel program is a simple sequence of statements.:
stats := stat [';'|'\n'] stats[...] Statements can be separated with a new line or ‘;’ (or with the keywords
caseordefaultif inside a switch/case statement), both symbols are not required if the statement is followed by ‘}’.
These are relatively complex rules and in their totality not context free if newlines can also be ignored everywhere else. Note however that in my understanding the text implies that ; or \n are required when no of the other cases apply. That would make your example illegal. That probably means that the BNF as written is correct, e.g. both ; and \n are optionally everywhere. In that case you can (for lark) just put an %ignore "\n" statement and it should work fine.
Also, lark should not complain if you both ignore the \n and use it in a rule: Where useful it will match it in a rule, otherwise it will just ignore it. Note however that this breaks if you use a Terminal that includes the \n (e.g. WS or /\s/). Just have \n as an extra case.
(For the future: You will probably get faster response for lark questions if you ask over on gitter or at least put a link to SO there.)
QUESTION
Im a student just starting out on NoSQL and its just not clicking with me. im a little confused on a few points. Any help would be greatly appreciated 1.Can documents belong to multiple collections?
2.Have I the correct syntax here for creating the Collection? The pic is the collection er and a is just a snippet of the full er.
...ANSWER
Answered 2021-May-28 at 01:49Can documents belong to multiple collections?
In MongoDB, no. In other databases, I don't know.
2.Have I the correct syntax here for creating the Collection?
To create a collection you would use https://docs.mongodb.com/manual/reference/method/db.createCollection/. This call also permits you to pass various collection options.
You are inserting a document. In MongoDB when a document is inserted, if the destination collection doesn't exist, it is created automatically by the server.
QUESTION
CREATE TABLE COPPER_TAN_META
(
ID decimal(22,0) PRIMARY KEY,
NOTES clob,
ERROR varchar2(2000)
);
CREATE UNIQUE INDEX SYS_C0070016 ON COPPER_TAN_META(ID);
ANSWER
Answered 2021-May-06 at 22:09- new values cannot be changed for
AFTERtrigger type, but possible forBEFORE localtimestampwithout argument might be used within the direct concatenation, butlocaltimestampwithprecisionargument such aslocaltimestamp(0)could be used within a SQL statement.
So, rewrite the code block as
QUESTION
i gone through a video link to create a simple java script based app using electron. https://www.youtube.com/watch?v=TnXz_nnQZrwI
While trying to create an app i got the following error even though i enable the nodeIntegration to true
index.html:12 Uncaught ReferenceError: require is not defined at index.html:12
I don't know how to resolve it plz help This is my js and Html files
my index.js file
...ANSWER
Answered 2021-Apr-30 at 21:03For Electron >= 12, nodeIntegration: true won't work without contextIsolation: false.
https://www.electronjs.org/docs/breaking-changes#default-changed-contextisolation-defaults-to-true
QUESTION
Since I used Electron forge webpack plugin, when I execute npm start, it will cause an error after step Compiling Preload Scripts. It says the error is inside Forge.
I check it out, it's an error in file watcher api, that mainCompilation.fileSystemInfo is undefined, so it cannot read prop createSnapShot function.
What should I do to resolve this error and start my app?
Logs:
...ANSWER
Answered 2021-Feb-04 at 19:56run npm install or yarn inside the project, to install project's dependencies
QUESTION
This query returns 3 years of records. How can I change it to return (the most recent) 1 year of records?
...ANSWER
Answered 2021-Apr-21 at 05:33use sub-query to find the max of inserted and then use it in where
QUESTION
I need to show different dropdown/selectinput for different tabs.
Ex. If tab one is selected, then show selectinput with a list of values Tim, Bill, Jeff, ... If tab two is selected, then show selectinput with a list of values Cat, Dog, Squirrel, ...
I found the below script online but it does vice-versa (shows/hides tabpanels based on selectinput selection - But I need show/hide selectinput based on tabpanel selection).
...ANSWER
Answered 2021-Apr-14 at 22:27Here you go.
QUESTION
I'm having some issues with a CRUD desktop application I developed with the help of a freelancer. It's an electron-forge build that works seamlessly on Windows 10, and works on MacOS initially when accessing the out folder, the strange thing happens when:
- I use
npm run publishto zip the Mac/Darwin instance - I manually package.zip the results of
npm run make
When I do this, and unzip the file to run, the SQLite integration fails completely. The app appears to be working upon start, but no changes can be made to the DB objects, nor can new objects be made.
The freelancer who put together the DB integration said he was not able to solve this issue, but it's impossible to put apps in marketplaces without zipping the application for delivery. I can post code if necessary, I just don't even know what aspect of the code would be relevant, and feel like there has to be something I can install/put in my package.json that might solve this, but I'm just not sure.
Here is my package.json file in case that is helpful:
...ANSWER
Answered 2021-Apr-08 at 21:26I found that by simply creating a DMG target (see https://www.electronforge.io/config/makers/dmg) that I did not need to worry about unzipping process. I believe DMG is the ideal approach for packaging Mac OS apps that have something like a SQLite database integration within.
QUESTION
I am new to the whole coding world. And I am currently creating a learning app for kids, and one of the categories included is taking a quiz. I wanted to shuffle all the questions and I was able to do so but the problem I am facing now is that the questions gets repeated
here is the code i used for Quiz questions activity
...ANSWER
Answered 2021-Mar-29 at 11:41The issue is you're calling the shuffle function in updateQuestion. So it updates the questionArray everytime updateQuestion method is called.
Solution
Remove shuffleQuestions(); from updateQuestion method and add it before updateQuestion(); in onCreate method such that shuffling happens once in the beginning when the class is loaded.
Updated source code
QUESTION
I am trying to split of letter and number boundaries, but the solution with lookarounds fails:
...ANSWER
Answered 2021-Mar-05 at 13:20With your shown samples only. Could you please try following, if this is what you are looking for. Written and tested in GNU awk(should work in any awk I believe).
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install Squirrel
Prerequisites: sudo apt-get -y update && apt-get -y upgrade sudo apt-get -y install gdb bison flex git make cmake build-essential gcc-multilib g++-multilib xinetd libreadline-dev zlib1g-dev sudo apt-get -y install clang libssl-dev libncurses5-dev # Compile AFL, which is used for instrumenting the DBMSs cd ~ git clone https://github.com/google/AFL.git cd AFL sed -i 's/#define MAP_SIZE_POW2 16/#define MAP_SIZE_POW2 18/' config.h make cd llvm_mode/ make
DBMS-specific requirements: Headers and libary of MySQL, PostgreSQL and MariaDB if you want to test them. The most direct way is to compile the DBMSs.
Compile Squirrel: git clone cd Squirrel/DBNAME/AFL make afl-fuzz # You need to set the path in the Makefile
Instrument DBMS: # SQLite: git clone https://github.com/sqlite/sqlite.git cd sqlite mkdir bld cd bld CC=/path/to/afl-gcc CXX=/path/to/afl-g++ ../configure # You can also turn on debug flag if you want to find assertion make # MySQL/PostgreSQL/MariaDB cd Squirrel/DBNAME/docker/ cp ../AFL/afl-fuzz . sudo docker build -t IMAGE_ID .
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