sqltables 1.4

SQL tables as first-class objects

SQLTables

SQLTables is a Python module that provides access to SQLite and PostgreSQL tables as first-class objects.

This means that tables and views can be assigned to variables and used as parameters and return values of Python functions.

Documentation: https://sqltables.readthedocs.io/

Examples are in the examples/ folder. The Machine Learning example notebook should illustrate most features.

Main Concepts and Example

The main objects are tables, represented by the Table class and associated with a Database. New tables are created with the create_table method on the Database object. Tables are queried with the view and table methods, which execute an SQL query and return a new Table object backed by a temporary view or table. Within SQL queries, the special name _ refers to the table associated with self.

A simple example:

db = sqltables.Database()
rows = [["a", 1], ["b", 2], ["c", 3]]
values = db.create_table(rows=rows, column_names=["name", "val"])
values

name	val
'a'	1
'b'	2
'c'	3

def square(tab):
    return tab.view("select name, val, val*val as squared from _")

square(values)

name	val	squared
'a'	1	1
'b'	2	4
'c'	3	9