run

run is the method to use when you want to run a query but do not care about the result e.g. to create a table:

>>> bliss.run("CREATE TABLE contributors (firstname VARCHAR, lastname VARCHAR)") #doctest: +ELLIPSIS
<sql.SQL object ...>
>>> bliss.run("INSERT INTO contributors VALUES (?, ?)", [('Andrew', 'Kuchling'),
...                                                      ('James', 'Henstridge'),
...                                                      ('Daniele', 'Varrazzo'),
...                                                      ('Marc-Andre', 'Lemburg')]) #doctest: +ELLIPSIS
<sql.SQL object ...>

Nothing impressive so far, creating a cursor and calling executemany would achieve the same result.

commit

Added in version 2022.4.0

>>> bliss.run("INSERT INTO contributors VALUES (?, ?)", ("Chad", "Whitacre")) #doctest: +ELLIPSIS
<sql.SQL object ...>
>>> bliss.commit()

Just because it is shorter than bliss.connection.commit()

run returns self so commit can be chained

>>> bliss.run("INSERT INTO contributors VALUES (?, ?)", ("Guido", "van Rossum")).commit()

one

one is the method to use when you know the result is a single row or only care about one.

>>> bliss.one("SELECT firstname FROM contributors WHERE lastname='Lemburg'") # doctest: +SKIP
u'Marc-Andre'

The string, nothing but the string, which in my book beats:

>>> cursor = connection.cursor()
>>> cursor.execute("SELECT firstname FROM contributors WHERE lastname='Lemburg'") # doctest: +ELLIPSIS
<sqlite3.Cursor object at ...>
>>> cursor.fetchone() # doctest: +SKIP
(u'Marc-Andre',)

Even better, if the result contains several column, one returns a namedtuple:

>>> bliss.one("SELECT * FROM contributors WHERE firstname='James'") # doctest: +SKIP
Record(firstname=u'James', lastname=u'Henstridge')

all

all is the method to use to retrieve all rows from a query.

>>> bliss.all("SELECT firstname FROM contributors") #doctest: +SKIP
[u'Andrew', u'James', u'Daniele', u'Marc-Andre']

It returns a list of namedtuples when appropriate:

>>> bliss.all("SELECT firstname, LENGTH(lastname) AS length FROM contributors") # doctest: +NORMALIZE_WHITESPACE +SKIP
[Record(firstname=u'Andrew', length=8),
 Record(firstname=u'James', length=10),
 Record(firstname=u'Daniele', length=8),
 Record(firstname=u'Marc-Andre', length=7)]