- #Running query in sqlpro for sqlite how to
- #Running query in sqlpro for sqlite full
- #Running query in sqlpro for sqlite code
- #Running query in sqlpro for sqlite simulator
With 4 concurrent threads SQLite is still faster than MongoDB.Ībout web sites, when using WAL mode, I can handle easily over 200 write transactions / second using very light single core VPS server with SSD. So as we can see, SQLite is much faster for single thread batch processing that most of other databases. Same test with 4 parallel threads MongoDB: 29.9 s Timing 100k reads from database: MongoDB: 43.3 s SQLite: 19.4 s So if I make 100k queries looking up information, it's probably fastest using SQLite than other databases, which run in their own process.
What? Faster? Yes, because it runs in the process, and doesn't require context change to proceed. One very important factor is that it's also faster than many other databases out there. One of most important features of SQLite is that it's included in Python base libs. When Python ORM is required, I'm using peewee. I'm using SQLite for most of my projects, in production and for hobby. Recently introduced CTE's are killer feature, since we have a bit of parent/children derived column values, and we keep filling values from the parent into the children, while with CTE this could be evaluated everytime (at some cost, but then less data being filled overall). Now this ignores the fact that the db might be changed and wont get the same results for each thread (I can't get the same transaction number from different threads/procs as I can with PG) but still works for some tasks. SELECT xx FROM yy LIMIT ll OFFSET oo ORDER BY zz - where it spreads on different threads "ll" and "oo". Recently I've had some success with speeding up (up to 4 threads) on scaling reads - e.g. Off course if memory usage becomes a problem, simply switching from :memory: to some kind of temp file per process would do it. This is done, since changes can be made in-memory which might not have to be written back. db from the OS into the memory, work on it, and "copy" it back. It is also cross platform, and is present in many Linux package repos.įrom the less little known things I love is the sqlite backup api.
It's the best I've seen, and the developers are very responsive to bug reports and pull requests. Those looking for a GUI to view SQLite databases should check out sqlitebrowser.
#Running query in sqlpro for sqlite how to
I also found this StackOverflow answer that explains how to easily change a column name in place. I agree that migrations can be a pain, but thankfully our tables are usually small enough that we can alter tables simply be recreating them. Writing GUI models and views over the database on the Python end of things is very straightforward, once you have your SQLAlchemy models set up.
#Running query in sqlpro for sqlite simulator
Our core simulator is written in Matlab for historical reasons, and we can communicate data easily using the database. Our application is an engineering simulation application. I also read this article entitled "SQLite As An Application File Format," which was the final straw for me to take the plunge.
I decided to use SQLite after realizing I was slowly reimplementing many features of a database. sqlite3 Test.db -init insert_data.We use SQLite as a file format for our desktop application (based on PySide) using SQLAlchemy. Here’s yet another way you can run SQL scripts from a file with SQLite. sqlite3 Test.db < insert_data.sql The -init Option The following method redirects the input to the database file when using sqlite3 to connect to SQLite and open the database. If you’re on Windows, you might need to do this: sqlite3.exe Test.db ".read insert_data.sql" Redirect the Input to the Database when Connecting to SQLite However, with this example, you run it from outside of SQLite. The difference between this example and the previous, is that the previous one was done from within SQLite after you’d already connected. sqlite3 Test.db ".read insert_data.sql"ĭoing this will insert the data into the specified database from the command line.
#Running query in sqlpro for sqlite full
Specify the full path if in a different directory. This example reads the script insert_data.sql from the current folder/directory. If you’re already connected to SQLite, you can use the. I was able to run this script directly from my Terminal window, without connecting to SQLite using the SQLite3 command. This assumes my script is called create_table.sql and I want to run it against the Test.db database.
#Running query in sqlpro for sqlite code
The following code demonstrates the first option for running an SQL script from a file in SQLite. This can be especially useful when you have a large script (such as creating a bunch of database tables and inserting data into those tables).īelow are five ways to run SQL scripts directly from a file in SQLite. SQLite provides us with the ability to run scripts directly from a file.