![]() ![]() In the examples below, we will cover this in more detail. If you get stuck, you can get an answer in 2-3 Google searches. Most of the commands are intuitive and easy to follow. I deliberately kept this section simple, so you can see how simple SQL is. We will be building on this knowledge and looking at more complicated examples when we open our 5GB file. This was a very simple introduction to Sql and Sqlite. Introduction to Sqlite with PythonĪ final commit(), and then we close() the database. ![]() And since it is file based, it is easy to share the data. Sqlite can easily handle websites with 100K/day visitors. While it’s a simple database, the main thing I want to emphasis is, it’s not a toy database. We will be using something called Sqlite, a free database that comes inbuilt with Python. If you are on Windows, use 7zip to unzip it, as Windows gets confused with the file. Real Reason (TM) programmers don’t use a database: They are scared of the weird syntax of SQL, which looks a lot like it was a language invented for business types in the 60s-70s (it was!). I have seen a fear of SQL in many people (and this is not a judgement, as I was in this club for a long time). You don’t need to master everything database related, but make sure when someone uses the word Acid you don’t say Yeah man, groovy. Have a skim through the top rated answer. It didn’t start off as a 5GB file, but grew over time till it became too large to open with Excel.ĭatabases routinely handle Gigabytes of data without any problems, so we should be using them. It works.įor an example, just look at the current file. Many scientists and engineers happy to use Ms Excel, CSV files, or even text files. You store the data in a database and read it. So how do you open a 5GB file? Not all of it at the same time is the answer. Not to mention, you may not even have enough memory to open it.Įven if you buy a more powerful machine, the lack of tools to work with large files will hold you back. Ms Excel can’t open it, Openoffice can’t open it, Notepad++ can’t open it. So the file we want to open is almost 5.3GB. Minor correction to video below: Sqlite can handle concurrent connections, though it may not be as fast. The videos are mixed with the transcripts, so scroll down if you are only interested in the videos. There are 6 videos + transcript in this series. ![]() Intro to SqLite.ipynb is the notebook we are working with. If you have used SQL with SqLite before, still have a look at the notebook, as I will be referring back to it. To start off, we will get a gentle intro to SQL. We will be using Ipython Notebooks( see here for a quick intro). While some people think this answer is common sense, I have seen far too many people intimidated with databases, so this series also serves as an introduction to SQL and Sqlite. format ( ix = index_name )) # Committing changes and closing the connection to the database fileĪfter we learned about how to create and modify SQLite databases, it’sĪbout time for some data retrieval.The Problem: We have a 5GB file, and no tool we have can work with such large files (provided you even have enough free RAM to hold the whole thing in memory). cursor () # Creating a new SQLite table with 1 columnĬ. New_field = 'my_1st_column' # name of the columnįield_type = 'INTEGER' # column data typeĬonn = sqlite3. Table_name2 = 'my_table_2' # name of the table to be created Table_name1 = 'my_table_1' # name of the table to be created Import sqlite3 sqlite_file = 'my_first_db.sqlite' # name of the sqlite database file Open a connection to an SQLite database file: In general, the only thing that needs to be done before we can performĪny operation on a SQLite database via Python’s sqlite3 module, is to Required, and no other obstacles we have to worry about. ![]() The Python Standard Library and is a nice and easy interface to SQLiteĭatabases: There are no server processes involved, no configurations The sqlite3 that we will be using throughout this tutorial is part of The complete Python code that I am using in this tutorial can be ![]()
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