Ticket #2358: mssql_update4.diff

File mssql_update4.diff, 13.4 KB (added by sdelatorre+django@…, 18 years ago)

I made a slight modification to the django.db.backends.util file to work with custom mssql queries. In general, the CursorDebugWrapper attempts to record the full SQL statement that was executed by performing a string substitution on the SQL statement with its query parameters. This doesn't work with mssql queries because they use a '?' for string substitution instead of the typical Python '%s'. The new changes introduced in this patch change all ‘?’ in mssql queries to ‘%s’ before the substitution is executed. The entire patch have also been updated against the latest SVN trunk.

  • django/db/models/base.py

     
    171171        record_exists = True
    172172        if pk_set:
    173173            # Determine whether a record with the primary key already exists.
    174             cursor.execute("SELECT 1 FROM %s WHERE %s=%%s LIMIT 1" % \
     174            cursor.execute("SELECT 1 FROM %s WHERE %s=%%s" %
    175175                (backend.quote_name(self._meta.db_table), backend.quote_name(self._meta.pk.column)), [pk_val])
    176176            # If it does already exist, do an UPDATE.
    177177            if cursor.fetchone():

  • django/db/models/fields/__init__.py

     
    490490        if value is not None:
    491491            # MySQL will throw a warning if microseconds are given, because it
    492492            # doesn't support microseconds.
    493             if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
     493            if (settings.DATABASE_ENGINE == 'mysql' or settings.DATABASE_ENGINE == 'ado_mssql') and hasattr(value, 'microsecond'):
    494494                value = value.replace(microsecond=0)
    495495            value = str(value)
    496496        return Field.get_db_prep_save(self, value)
    497497
    498     def get_db_prep_lookup(self, lookup_type, value):
     498    def get_db_prep_lookup(self, lookup_type, value):
     499        # MSSQL doesn't like microseconds.
     500        if settings.DATABASE_ENGINE == 'ado_mssql' and hasattr(value, 'microsecond'):
     501            value = value.replace(microsecond=0)
    499502        if lookup_type == 'range':
    500503            value = [str(v) for v in value]
    501504        else:
    … …  
    754757        if value is not None:
    755758            # MySQL will throw a warning if microseconds are given, because it
    756759            # doesn't support microseconds.
    757             if settings.DATABASE_ENGINE == 'mysql':
     760            if settings.DATABASE_ENGINE == 'mysql' or settings.DATABASE_ENGINE == 'ado_mssql':
    758761                value = value.replace(microsecond=0)
    759762            value = str(value)
    760763        return Field.get_db_prep_save(self, value)

  • django/db/backends/ado_mssql/base.py

     
    33
    44Requires adodbapi 2.0.1: http://adodbapi.sourceforge.net/
    55"""
     6import pythoncom
    67
    78from django.db.backends import util
    89try:
    … …  
    6970                settings.DATABASE_HOST = "127.0.0.1"
    7071            # TODO: Handle DATABASE_PORT.
    7172            conn_string = "PROVIDER=SQLOLEDB;DATA SOURCE=%s;UID=%s;PWD=%s;DATABASE=%s" % (settings.DATABASE_HOST, settings.DATABASE_USER, settings.DATABASE_PASSWORD, settings.DATABASE_NAME)
    72             self.connection = Database.connect(conn_string)
    73         cursor = self.connection.cursor()
     73            pythoncom.CoInitialize()
     74            self.connection = Database.connect(conn_string)
     75            pythoncom.CoUninitialize()
     76       
     77        cursor = Cursor(self.connection)
    7478        if settings.DEBUG:
    7579            return util.CursorDebugWrapper(cursor, self)
    7680        return cursor
    … …  
    115119    if lookup_type=='day':
    116120        return "Convert(datetime, Convert(varchar(12), %s))" % field_name
    117121
    118 def get_limit_offset_sql(limit, offset=None):
    119     # TODO: This is a guess. Make sure this is correct.
    120     sql = "LIMIT %s" % limit
    121     if offset and offset != 0:
    122         sql += " OFFSET %s" % offset
    123     return sql
     122def get_limit_offset_sql(limit, offset=None):
     123    # TODO: This is a guess. Make sure this is correct.
     124    # should be "SELECT TOP %s" % limit
     125    # not LIMIT at the end
     126    return ""
     127    #sql = "LIMIT %s" % limit
     128    #if offset and offset != 0:
     129    #    sql += " OFFSET %s" % offset
     130    #return sql
    124131
    125132def get_random_function_sql():
    126133    return "RAND()"

  • django/db/backends/ado_mssql/introspection.py

     
    1 def get_table_list(cursor):
    2     raise NotImplementedError
     1# Tested against MSDE and SQL Server 2000 using adodbapi 2.0.1
     2# Python 2.4.2 and 2.4.3 were used during testing.
     3from django.db.backends.ado_mssql.base import Cursor
     4
     5def get_table_list(cursor):
     6    "Returns a list of table names in the current database."
     7    print "# Note: Any fields that are named 'id', are of type 'AutoField', and"
     8    print "# and are Primary Keys will NOT appear in the model output below."
     9    print "# By default Django assumes that the each model's Primary Key is an "
     10    print "# AutoField with a name of 'id', so there is no need to add it to the"
     11    print "# model description."
     12    print
     13    cursor.execute("SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'")
     14    return [row[2] for row in cursor.fetchall()]
     15
     16def _is_auto_field(cursor, table_name, column_name):
     17    cursor.execute("SELECT COLUMNPROPERTY( OBJECT_ID('%s'),'%s','IsIdentity')" % (table_name, column_name))
     18    return cursor.fetchall()[0][0]
    319
    4 def get_table_description(cursor, table_name):
    5     raise NotImplementedError
     20def get_table_description(cursor, table_name, identity_check=True):
     21    """Returns a description of the table, with the DB-API cursor.description interface.
     22
     23    The 'auto_check' parameter has been added to the function argspec.
     24    If set to True, the function will check each of the table's fields for the
     25    IDENTITY property (the IDENTITY property is the MSSQL equivalent to an AutoField).
     26
     27    When a field is found with an IDENTITY property, it is given a custom field number
     28    of -777, which maps to the 'AutoField' value in the DATA_TYPES_REVERSE dict.
     29    """   
     30    cursor.execute("SELECT TOP 1 * FROM %s" % table_name)
     31    cursor.nextset()
     32    items = []
     33    if identity_check:
     34        for data in cursor.description:
     35            if _is_auto_field(cursor, table_name, data[0]):
     36                data = list(data)
     37                data[1] = -777
     38            items.append(list(data))
     39    else:
     40        items = cursor.description
     41    return items
     42
     43def _name_to_index(cursor, table_name):
     44    """
     45    Returns a dictionary of {field_name: field_index} for the given table.
     46    Indexes are 0-based.
     47    """
     48    return dict([(d[0], i) for i, d in enumerate(get_table_description(cursor, table_name, identity_check=False))])
    649
    7 def get_relations(cursor, table_name):
    8     raise NotImplementedError
    9 
    10 def get_indexes(cursor, table_name):
    11     raise NotImplementedError
    12 
    13 DATA_TYPES_REVERSE = {}
     50def get_relations(cursor, table_name):
     51    """
     52    Returns a dictionary of {field_index: (field_index_other_table, other_table)}
     53    representing all relationships to the given table. Indexes are 0-based.   
     54    """
     55    table_index = _name_to_index(cursor, table_name)
     56    sql = """SELECT e.COLUMN_NAME AS column_name,
     57                    c.TABLE_NAME AS referenced_table_name,
     58                    d.COLUMN_NAME AS referenced_column_name
     59                    FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS a
     60                        INNER JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS AS b
     61                              ON a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
     62                        INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_TABLE_USAGE AS c
     63                              ON b.UNIQUE_CONSTRAINT_NAME = c.CONSTRAINT_NAME
     64                        INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE AS d
     65                              ON c.CONSTRAINT_NAME = d.CONSTRAINT_NAME
     66                        INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE AS e
     67                              ON a.CONSTRAINT_NAME = e.CONSTRAINT_NAME
     68                    WHERE a.TABLE_NAME = ? AND
     69                          a.CONSTRAINT_TYPE = 'FOREIGN KEY'"""
     70    cursor = Cursor(cursor.db.connection)
     71    cursor.execute(sql, (table_name,))
     72    return dict([(table_index[item[0]], (_name_to_index(cursor, item[1])[item[2]], item[1]))
     73                  for item in cursor.fetchall()])
     74   
     75def get_indexes(cursor, table_name):
     76    """
     77    Returns a dictionary of fieldname -> infodict for the given table,
     78    where each infodict is in the format:
     79        {'primary_key': boolean representing whether it's the primary key,
     80         'unique': boolean representing whether it's a unique index}
     81    """
     82    sql = """SELECT b.COLUMN_NAME, a.CONSTRAINT_TYPE
     83               FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS a INNER JOIN
     84                    INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE AS b
     85                    ON a.CONSTRAINT_NAME = b.CONSTRAINT_NAME AND
     86                       a.TABLE_NAME = b.TABLE_NAME
     87               WHERE a.TABLE_NAME = ? AND
     88                     (CONSTRAINT_TYPE = 'PRIMARY KEY' OR
     89                      CONSTRAINT_TYPE = 'UNIQUE')"""
     90    field_names = [item[0] for item in get_table_description(cursor, table_name, identity_check=False)]
     91    cursor = Cursor(cursor.db.connection)
     92    cursor.execute(sql, (table_name,))
     93    indexes = {}
     94    results = {}
     95    data = cursor.fetchall()
     96    if data:
     97        results.update(data)
     98    for field in field_names:
     99        val = results.get(field, None)
     100        indexes[field] = dict(primary_key=(val=='PRIMARY KEY'), unique=(val=='UNIQUE'))
     101    return indexes
     102
     103# A reference for the values below:
     104# http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ado270/htm/mdcstdatatypeenum.asp
     105DATA_TYPES_REVERSE = {
     106# 8192 : Array ,
     107# 128 : Binary ,
     108# 9 : IDispatch ,
     109# 12 : Variant ,
     110# 13 : IUnknown ,
     111# 21  : UnsignedBigInt,
     112# 132 : UserDefined ,
     113# 0   : Empty ,
     114# 136 : Chapter ,
     115# 138 : PropVariant ,
     116# 204 : VarBinary ,
     117# 205 : LongVarBinary ,
     118-777: 'AutoField',                  # Custom number used to identify AutoFields
     1192   : 'SmallIntegerField',          # SmallInt
     1203   : 'IntegerField',               # Integer
     1214   : 'FloatField',                 # Single
     1225   : 'FloatField',                 # Decimal
     1236   : 'FloatField',                 # Currency
     1247   : 'DateField',                  # Date
     1258   : 'CharField',                  # BSTR
     12610  : 'IntegerField',               # Error
     12711  : 'BooleanField',               # Boolean
     12814  : 'FloatField',                 # Decimal
     12916  : 'SmallIntegerField',          # TinyInt
     13017  : 'PositiveSmallIntegerField',  # UnsignedTinyInt
     13118  : 'PositiveSmallIntegerField',  # UnsignedSmallInt
     13219  : 'PositiveIntegerField',       # UnsignedInt
     13320  : 'IntegerField',               # BigInt
     13464  : 'DateTimeField',              # FileTime
     13572  : 'CharField',                  # GUID
     136129 : 'CharField',                  # Char
     137130 : 'CharField',                  # WChar
     138131 : 'FloatField',                 # Numeric
     139133 : 'DateField',                  # DBDate
     140134 : 'TimeField',                  # DBTime
     141135 : 'DateTimeField',              # DBTimeStamp
     142139 : 'FloatField',                 # VarNumeric
     143200 : 'CharField',                  # VarChar
     144201 : 'TextField',                  # LongVarChar
     145202 : 'CharField',                  # VarWChar
     146203 : 'TextField',                  # LongVarWChar
     147}

  • django/db/backends/util.py

     
     1from django.conf import settings
    12import datetime
    23from time import time
    34
    … …  
    1516            # If params was a list, convert it to a tuple, because string
    1617            # formatting with '%' only works with tuples or dicts.
    1718            if not isinstance(params, (tuple, dict)):
    18                 params = tuple(params)
     19                params = tuple(params)
     20            # ado_mssql uses '?' for parameter escaping, so all '?'
     21            # must be replaced with the standard '%s' if the parameter
     22            # substitution is going to work.
     23            if settings.DATABASE_ENGINE == 'ado_mssql':
     24                sql = sql.replace('?', '%s')
    1925            self.db.queries.append({
    2026                'sql': sql % tuple(params),
    2127                'time': "%.3f" % (stop - start),

  • django/contrib/sessions/middleware.py

     
    5151            if self.session_key is None:
    5252                self._session_cache = {}
    5353            else:
    54                 try:
    55                     s = Session.objects.get(session_key=self.session_key,
    56                         expire_date__gt=datetime.datetime.now())
     54                try:
     55                    datenow = datetime.datetime.now()
     56                    if hasattr(datenow, 'microsecond'):
     57                        datenow = datenow.replace(microsecond=0)
     58                    s = Session.objects.get(session_key=self.session_key,
     59                        expire_date__gt=datenow)
    5760                    self._session_cache = s.get_decoded()
    5861                except Session.DoesNotExist:
    5962                    self._session_cache = {}
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