MysqlSimpleQueryBuilder 0.2.7

Simple MySQL query builder and profiler

Following the rule simple easy, complex possibe, MySql Simple Query Builder provides API for basic queries, nested transactions, and aid in complex query building and profiling.

DML

SELECT

The following modes are supported:

• counting:

  db.count('customer', {'storeId' : 1})
  # 326L

• single row’s field value:

  db.one(('firstName',), 'customer', {'customerId' : 1})
  # u'MARY'

• single row’s fields value dictionary:

  db.one(('firstName', 'lastName'), 'customer', {'customerId' : 1})
  # {'firstName': u'MARY', 'lastName': u'SMITH'}

• multiple rows’ single field value projection:

  db.select(('firstName',), 'customer', {'customerId' : (1, 2)})
  # (u'MARY', u'PATRICIA')

• multiple rows’ fields value tuple:

  db.select(('firstName', 'lastName'), 'customer', {'customerId' : (1, 2)})
  # ({'firstName': u'MARY', 'lastName': u'SMITH'}, {'firstName': u'PATRICIA', 'lastName': u'JOHNSON'})

WHERE condition is a conjunction. Supported arguments are ones support by underlying library, MySQLdb, and its escaping functionality:

• None,

• int (long, float, Decimal),

• datetime (date),

• unicode (str),

• tuple of int (list of int),

Besides supported are ORDER BY and LIMIT.

Complex query

sql = '''
  SELECT c.first_name `firstName`, c.last_name `lastName`
  FROM customer c
  JOIN store    s USING(store_id)
  JOIN staff    t ON s.manager_staff_id = t.staff_id
  {where} AND t.email LIKE {like}
'''
db.query(
  # escape % as it is used by MySQLdb
  sql.replace('{like}', db.quote('[e-mail]')),
  {'c.active' : True},
  limit = 1
).fetchall()
# ({'firstName': u'MARY', 'lastName': u'SMITH'},)

Or the same with cursor:

sql = '''
  SELECT c.first_name `firstName`, c.last_name `lastName`
  FROM customer c
  JOIN store    s USING(store_id)
  JOIN staff    t ON s.manager_staff_id = t.staff_id
  WHERE c.active = :active AND t.email LIKE :email
  LIMIT 0, 1
'''
cursor = db.cursor(dict)
cursor.execute(sql, {'active' : True, 'email' : '[e-mail]'})
cursor.fetchall()
# ({'firstName': u'MARY', 'lastName': u'SMITH'},)

INSERT

Supports single row insert.

UPDATE

Supports one table at a time. Has the same WHERE features as decribed above.

DELETE

Supports one table at a time. Has the same WHERE features as decribed above.

Test

Test suite is built against Sakila test database available at MySQL site. Besides allowing further refacotring, it provides examples of usage.