Psycho

An ultra simple wrapper for Python psycopg2 with very basic functionality

• Scott Clark, September 2015
• MIT License

Installation

From the source

python setup.py install

#Usage

from psycho import Psycho

db = Psycho(
	host="127.0.0.1",
	database="mydatabase",
	user="username",
	password="password",
	keep_alive=True # try and reconnect timed out postgresql connections?
)

# insert a record to the <em>books</em> table
db.insert("books", {"type": "paperback", "name": "Time Machine", "price": 5.55, year: "1997"})

book = db.getOne("books", ["name"], ["year = 1997"])

print "The book's name is " + book.name

#Query methods insert(), update(), delete(), getOne(), getAll(), query()

##insert(table, record{}) Inserts a single record into a table.

db.insert("food", {"type": "fruit", "name": "Apple", "color": "red"})
db.insert("books", {"type": "paperback", "name": "Time Machine", "price": 5.55})

##update(table, row{}, condition[]) Update one more or rows based on a condition (or no condition).

# update all rows
db.update("books", {"discount": 0})

# update rows based on a simple hardcoded condition
db.update("books",
	{"discount": 10},
	["id=1"]
)

# update rows based on a parametrized condition
db.update("books",
	{"discount": 10},
	("id=%s AND year=%s", [id, year])
)

##insertOrUpdate(table, row{}, key) Insert a new row, or update if there is a primary key conflict.

# insert a book with id 123. if it already exists, update values
db.insert("books",
		{"id": 123, type": "paperback", "name": "Time Machine", "price": 5.55},
		"id"
)

##getOne(table, fields[], condition[], order[], limit[]) ##getAll(table, fields[], condition[], order[], limit[]) Get a single record or multiple records from a table given a condition (or no condition). The resultant rows are returned as namedtuples. getOne() returns a single namedtuple, and getAll() returns a list of namedtuples.

book = db.getOne("books", ["id", "name"])

# get a row based on a simple hardcoded condition
book = db.getOne("books", ["name", "year"], ("id=1"))

# get a row based on a simple hardcoded condition
book = db.getOne("books", ["name", "year"], ("id=1"))

# get multiple rows based on a parametrized condition
books = db.getAll("books",
	["id", "name"],
	("year > %s and price < 15", [year, 12.99])
)

# get multiple rows based on a parametrized condition with an order and limit specified
books = db.getAll("books",
	["id", "name", "year"],
	("year > %s and price < 15", [year, 12.99]),
	["year", "DESC"],	# ORDER BY year DESC
	[0, 10]			# LIMIT 0, 10
)

delete(table, fields[], condition[], order[], limit[])

Delete one or more records based on a condition (or no condition)

# delete all rows
db.delete("books")

# delete rows based on a condition
db.delete("books", ("price > %s AND year < %s", [25, 1999]))

##query(table) Run a raw SQL query. The psycopg2 cursor is returned.

db.query("DELETE FROM books WHERE year > 2005")

commit()

Insert, update, and delete operations on transactional databases such as innoDB need to be committed