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Sto provando a eseguire uno script ETL utilizzando python e MySQLdb ma sono bloccato con i risultati della mia query di estrazione iniziale. I tipi restituiti sono tutti lunghi e decimali quando voglio Int e Float. Ho cercato in giro per alcune ore cercando di ottenere una risposta a questo senza alcun successo.I convertitori Python MySQLdb non funzionano
database = MySQLdb.connect(host='db',user='user',
passwd='password', db='db123')
database_cursor = database.cursor()
database_query = ("SELECT id, siteId, campaignId, hour, sum(impressions) AS impressions, "
"sum(clicks) AS clicks, sum(conversions) AS conversions, sum(costs/1000000) AS revenue "
"FROM database.DM_PublisherFact_Hourly WHERE time = '%s' GROUP BY siteId, campaignId;") %(today)
print database_query
database_cursor.execute(database_query)
result = database_cursor.fetchone()
database.close()
Il valore restituito è una tupla di Long e Decimali. Ho provato a passare esplicitamente il dizionario delle conversioni all'oggetto connect ma non ci sono fortuna. Qualsiasi aiuto?
Ecco il codice conversioni
"""MySQLdb type conversion module
This module handles all the type conversions for MySQL. If the default
type conversions aren't what you need, you can make your own. The
dictionary conversions maps some kind of type to a conversion function
which returns the corresponding value:
Key: FIELD_TYPE.* (from MySQLdb.constants)
Conversion function:
Arguments: string
Returns: Python object
Key: Python type object (from types) or class
Conversion function:
Arguments: Python object of indicated type or class AND
conversion dictionary
Returns: SQL literal value
Notes: Most conversion functions can ignore the dictionary, but
it is a required parameter. It is necessary for converting
things like sequences and instances.
Don't modify conversions if you can avoid it. Instead, make copies
(with the copy() method), modify the copies, and then pass them to
MySQL.connect().
"""
from _mysql import string_literal, escape_sequence, escape_dict, escape, NULL
from constants import FIELD_TYPE, FLAG
from times import *
import types
import array
try:
set
except NameError:
from sets import Set as set
def Bool2Str(s, d): return str(int(s))
def Str2Set(s):
values = s.split(',')
return map(str, tuple(values))
def Set2Str(s, d):
return string_literal(','.join(s), d)
def Thing2Str(s, d):
"""Convert something into a string via str()."""
return str(s)
def Unicode2Str(s, d):
"""Convert a unicode object to a string using the default encoding.
This is only used as a placeholder for the real function, which
is connection-dependent."""
return s.encode()
Long2Int = Thing2Str
def Float2Str(o, d):
return '%.15g' % o
def None2NULL(o, d):
"""Convert None to NULL."""
return NULL # duh
def Thing2Literal(o, d):
"""Convert something into a SQL string literal. If using
MySQL-3.23 or newer, string_literal() is a method of the
_mysql.MYSQL object, and this function will be overridden with
that method when the connection is created."""
return string_literal(o, d)
def Instance2Str(o, d):
"""
Convert an Instance to a string representation. If the __str__()
method produces acceptable output, then you don't need to add the
class to conversions; it will be handled by the default
converter. If the exact class is not found in d, it will use the
first class it can find for which o is an instance.
"""
if d.has_key(o.__class__):
return d[o.__class__](o, d)
cl = filter(lambda x,o=o:
type(x) is types.ClassType
and isinstance(o, x), d.keys())
if not cl and hasattr(types, 'ObjectType'):
cl = filter(lambda x,o=o:
type(x) is types.TypeType
and isinstance(o, x)
and d[x] is not Instance2Str,
d.keys())
if not cl:
return d[types.StringType](o,d)
d[o.__class__] = d[cl[0]]
return d[cl[0]](o, d)
def char_array(s):
return array.array('c', s)
def array2Str(o, d):
return Thing2Literal(o.tostring(), d)
conversions = {
types.IntType: Thing2Str,
types.LongType: Long2Int,
types.FloatType: Float2Str,
types.NoneType: None2NULL,
types.TupleType: escape_sequence,
types.ListType: escape_sequence,
types.DictType: escape_dict,
types.InstanceType: Instance2Str,
array.ArrayType: array2Str,
types.StringType: Thing2Literal, # default
types.UnicodeType: Unicode2Str,
types.ObjectType: Instance2Str,
types.BooleanType: Bool2Str,
DateTimeType: DateTime2literal,
DateTimeDeltaType: DateTimeDelta2literal,
set: Set2Str,
FIELD_TYPE.TINY: int,
FIELD_TYPE.SHORT: int,
FIELD_TYPE.LONG: long,
FIELD_TYPE.FLOAT: float,
FIELD_TYPE.DOUBLE: float,
FIELD_TYPE.DECIMAL: float,
FIELD_TYPE.NEWDECIMAL: float,
FIELD_TYPE.LONGLONG: long,
FIELD_TYPE.INT24: int,
FIELD_TYPE.YEAR: int,
FIELD_TYPE.SET: Str2Set,
FIELD_TYPE.TIMESTAMP: mysql_timestamp_converter,
FIELD_TYPE.DATETIME: DateTime_or_None,
FIELD_TYPE.TIME: TimeDelta_or_None,
FIELD_TYPE.DATE: Date_or_None,
FIELD_TYPE.BLOB: [
(FLAG.BINARY, str),
],
FIELD_TYPE.STRING: [
(FLAG.BINARY, str),
],
FIELD_TYPE.VAR_STRING: [
(FLAG.BINARY, str),
],
FIELD_TYPE.VARCHAR: [
(FLAG.BINARY, str),
],
}
try:
from decimal import Decimal
conversions[FIELD_TYPE.DECIMAL] = Decimal
conversions[FIELD_TYPE.NEWDECIMAL] = Decimal
except ImportError:
pass
try:
from types import BooleanType
def Bool2Str(s, d): return str(int(s))
conversions[BooleanType] = Bool2Str
except ImportError:
pass
Intendevo che potresti pubblicare il codice per le conversioni che stavi cercando? –