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Code Issues 32 Releases Wiki Activity

Refactored get_date_trunc_sql() to DatabaseOperations.date_trunc_sql(). Refs #5106

Browse Source 
git-svn-id: http://code.djangoproject.com/svn/django/trunk@5952 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
2007-08-19 22:47:43 +00:00
parent aab04a4c2f
commit 5f51f0524a
10 changed files with 67 additions and 67 deletions
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8
django/db/backends/__init__.py
View File

@@ -60,3 +60,11 @@ class BaseDatabaseOperations(object):
extracts a value from the given date field field_name.
"""
raise NotImplementedError()
def date_trunc_sql(self, lookup_type, field_name):
"""
Given a lookup_type of 'year', 'month' or 'day', returns the SQL that
truncates the given date field field_name to a DATE object with only
the given specificity.
"""
raise NotImplementedError()

17
django/db/backends/ado_mssql/base.py
View File

@@ -52,6 +52,14 @@ class DatabaseOperations(BaseDatabaseOperations):
def date_extract_sql(self, lookup_type, field_name):
return "DATEPART(%s, %s)" % (lookup_type, field_name)
def date_trunc_sql(self, lookup_type, field_name):
if lookup_type == 'year':
return "Convert(datetime, Convert(varchar, DATEPART(year, %s)) + '/01/01')" % field_name
if lookup_type == 'month':
return "Convert(datetime, Convert(varchar, DATEPART(year, %s)) + '/' + Convert(varchar, DATEPART(month, %s)) + '/01')" % (field_name, field_name)
if lookup_type == 'day':
return "Convert(datetime, Convert(varchar(12), %s))" % field_name
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -89,15 +97,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
cursor.execute("SELECT %s FROM %s WHERE %s = @@IDENTITY" % (pk_name, table_name, pk_name))
return cursor.fetchone()[0]
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
if lookup_type=='year':
return "Convert(datetime, Convert(varchar, DATEPART(year, %s)) + '/01/01')" % field_name
if lookup_type=='month':
return "Convert(datetime, Convert(varchar, DATEPART(year, %s)) + '/' + Convert(varchar, DATEPART(month, %s)) + '/01')" % (field_name, field_name)
if lookup_type=='day':
return "Convert(datetime, Convert(varchar(12), %s))" % field_name
def get_datetime_cast_sql():
return None

1
django/db/backends/dummy/base.py
View File

@@ -44,7 +44,6 @@ dictfetchone = complain
dictfetchmany = complain
dictfetchall = complain
get_last_insert_id = complain
get_date_trunc_sql = complain
get_datetime_cast_sql = complain
get_limit_offset_sql = complain
get_random_function_sql = complain

27
django/db/backends/mysql/base.py
View File

@@ -58,6 +58,19 @@ class DatabaseOperations(BaseDatabaseOperations):
# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name)
def date_trunc_sql(self, lookup_type, field_name):
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
sql = field_name
else:
format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
return sql
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -139,20 +152,6 @@ dictfetchall = util.dictfetchall
def get_last_insert_id(cursor, table_name, pk_name):
return cursor.lastrowid
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
sql = field_name
else:
format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
return sql
def get_datetime_cast_sql():
return None

27
django/db/backends/mysql_old/base.py
View File

@@ -68,6 +68,19 @@ class DatabaseOperations(BaseDatabaseOperations):
# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name)
def date_trunc_sql(self, lookup_type, field_name):
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
sql = field_name
else:
format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
return sql
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -158,20 +171,6 @@ dictfetchall = util.dictfetchall
def get_last_insert_id(cursor, table_name, pk_name):
return cursor.lastrowid
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
sql = field_name
else:
format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
return sql
def get_datetime_cast_sql():
return None

19
django/db/backends/oracle/base.py
View File

@@ -42,6 +42,15 @@ class DatabaseOperations(BaseDatabaseOperations):
# http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions42a.htm#1017163
return "EXTRACT(%s FROM %s)" % (lookup_type, field_name)
def date_trunc_sql(self, lookup_type, field_name):
# Oracle uses TRUNC() for both dates and numbers.
# http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions155a.htm#SQLRF06151
if lookup_type == 'day':
sql = 'TRUNC(%s)' % field_name
else:
sql = "TRUNC(%s, '%s')" % (field_name, lookup_type)
return sql
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -157,16 +166,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
cursor.execute('SELECT %s_sq.currval FROM dual' % sq_name)
return cursor.fetchone()[0]
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# Oracle uses TRUNC() for both dates and numbers.
# http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions155a.htm#SQLRF06151
if lookup_type == 'day':
sql = 'TRUNC(%s)' % (field_name,)
else:
sql = "TRUNC(%s, '%s')" % (field_name, lookup_type)
return sql
def get_datetime_cast_sql():
return "TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS.FF')"

9
django/db/backends/postgresql/base.py
View File

@@ -62,6 +62,10 @@ class DatabaseOperations(BaseDatabaseOperations):
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name)
def date_trunc_sql(self, lookup_type, field_name):
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -124,11 +128,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
return cursor.fetchone()[0]
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
def get_datetime_cast_sql():
return None

9
django/db/backends/postgresql_psycopg2/base.py
View File

@@ -24,6 +24,10 @@ class DatabaseOperations(BaseDatabaseOperations):
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name)
def date_trunc_sql(self, lookup_type, field_name):
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -78,11 +82,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
return cursor.fetchone()[0]
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
def get_datetime_cast_sql():
return None

12
django/db/backends/sqlite3/base.py
View File

@@ -37,9 +37,14 @@ Database.register_adapter(decimal.Decimal, util.rev_typecast_decimal)
class DatabaseOperations(BaseDatabaseOperations):
def date_extract_sql(self, lookup_type, field_name):
# sqlite doesn't support extract, so we fake it with the user-defined
# function _sqlite_extract that's registered in connect().
# function django_extract that's registered in connect().
return 'django_extract("%s", %s)' % (lookup_type.lower(), field_name)
def date_trunc_sql(self, lookup_type, field_name):
# sqlite doesn't support DATE_TRUNC, so we fake it with a user-defined
# function django_date_trunc that's registered in connect().
return 'django_date_trunc("%s", %s)' % (lookup_type.lower(), field_name)
class DatabaseWrapper(BaseDatabaseWrapper):
ops = DatabaseOperations()
@@ -110,11 +115,6 @@ def _sqlite_extract(lookup_type, dt):
return None
return str(getattr(dt, lookup_type))
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# sqlite doesn't support DATE_TRUNC, so we fake it as above.
return 'django_date_trunc("%s", %s)' % (lookup_type.lower(), field_name)
def get_datetime_cast_sql():
return None

5
django/db/models/query.py
View File

@@ -647,11 +647,10 @@ class DateQuerySet(QuerySet):
if backend.allows_group_by_ordinal:
group_by = '1'
else:
group_by = backend.get_date_trunc_sql(self._kind,
'%s.%s' % (table_name, field_name))
group_by = connection.ops.date_trunc_sql(self._kind, '%s.%s' % (table_name, field_name))
sql = 'SELECT %s %s GROUP BY %s ORDER BY 1 %s' % \
(backend.get_date_trunc_sql(self._kind, '%s.%s' % (backend.quote_name(self.model._meta.db_table),
(connection.ops.date_trunc_sql(self._kind, '%s.%s' % (backend.quote_name(self.model._meta.db_table),
backend.quote_name(self._field.column))), sql, group_by, self._order)
cursor = connection.cursor()
cursor.execute(sql, params)