Paginación de access

sqlquerybuilder/__init__.py

@@ -8,7 +8,7 @@ PYTHON3 = True
 if sys.version_info[0] < 3:
     PYTHON3 = False
 
-VERSION = "0.0.19"
+VERSION = "0.0.15"
 
 
 def is_map(obj):
@@ -23,12 +23,13 @@ def ensureUtf(s):
         if isinstance(s, str):
             return s
         else:
-            return s.encode("utf8", "ignore")
+            return s.encode('utf8', 'ignore')
     except:
         return str(s)
 
 
 class classproperty(object):
+
     def __init__(self, getter):
         self.getter = getter
 
@@ -37,10 +38,10 @@ class classproperty(object):
 
 
 class QMixin(object):
-    AND = "AND"
-    OR = "OR"
-    NOT = "NOT"
-    UNION = "UNION"
+    AND = 'AND'
+    OR = 'OR'
+    NOT = 'NOT'
+    UNION = 'UNION'
 
     def _combine(self, other, conn):
         return Operator(conn, self, other)
@@ -53,21 +54,18 @@ class QMixin(object):
     def __and__(self, other):
         return self._combine(other, self.AND)
 
-    def __invert__(
-        self,
-    ):
+    def __invert__(self,):
         return Operator(self.NOT, self)
 
 
 class Operator(QMixin):
+
     def __init__(self, op=None, left=None, right=None):
         self.op = op
         self.left = left
         self.right = right
 
-    def __repr__(
-        self,
-    ):
+    def __repr__(self,):
         if self.left and self.right:
             return "(%s %s %s)" % (self.left, self.op, self.right)
 
@@ -88,12 +86,11 @@ class Operator(QMixin):
 
 
 class F(object):
+
     def __init__(self, value):
         self.value = value
 
-    def __repr__(
-        self,
-    ):
+    def __repr__(self,):
         return "%s" % self.value
 
     __str__ = __repr__
@@ -108,28 +105,16 @@ class Q(QMixin):
     _mode = "MYSQL"
 
     lookup_types = [
-        "icontains",
-        "istartswith",
-        "iendswith",
-        "contains",
-        "startswith",
-        "endswith",
-        "year",
-        "month",
-        "day",
-        "week_day",
-        "hour",
-        "minute",
-        "second",
-        "isnull",
-        "in",
-    ]
+        'icontains', 'istartswith', 'iendswith',
+        'contains', 'startswith', 'endswith',
+        'year', 'month', 'day', 'week_day', 'hour', 'minute', 'second',
+        'isnull', 'in']
 
     op_map = {
-        "lte": "<=",
-        "gte": ">=",
-        "lt": "<",
-        "gt": ">",
+        'lte': '<=',
+        'gte': '>=',
+        'lt': '<',
+        'gt': '>',
     }
 
     def __init__(self, *args, **kwargs):
@@ -137,9 +122,7 @@ class Q(QMixin):
         for arg in args:
             self.conditions[arg] = None
 
-    def __repr__(
-        self,
-    ):
+    def __repr__(self,):
         return self._compile()
 
     def __bool__(self):
@@ -149,13 +132,13 @@ class Q(QMixin):
 
     @property
     def date_format(self):
-        if self._mode == "SQL_SERVER":
+        if self._mode == 'SQL_SERVER':
             return "%Y-%d-%m"
         return "%Y-%m-%d"
 
     @property
     def datetime_format(self):
-        if self._mode == "SQL_SERVER":
+        if self._mode == 'SQL_SERVER':
             return "%Y-%d-%m %H:%M:%S"
         return "%Y-%m-%d %H:%M:%S"
 
@@ -172,11 +155,7 @@ class Q(QMixin):
         if isinstance(value, list) or isinstance(value, set) or is_map(value):
             return ", ".join([self._get_value(item) for item in value])
 
-        if (
-            isinstance(value, F)
-            or isinstance(value, QMixin)
-            or isinstance(value, SQLQuery)
-        ):
+        if isinstance(value, F) or isinstance(value, QMixin) or isinstance(value, SQLQuery):
             return ensureUtf(value)
 
         return "'%s'" % value
@@ -184,7 +163,7 @@ class Q(QMixin):
     def _process(self, compose_column, value):
         arr = compose_column.split("__")
         column = arr.pop(0)
-        if column == "":
+        if column == '':
             column += "__" + arr.pop(0)
 
         try:
@@ -214,36 +193,28 @@ class Q(QMixin):
             if lookup == "in":
                 return "{0} in ({1})".format(column, self._get_value(value))
 
-            if lookup == "isnull":
+            if lookup == 'isnull':
                 op = ""
                 if not value:
                     op = "NOT "
                 return "{0} is {1}NULL".format(column, op)
 
-            if lookup in ["year", "month", "day", "hour", "minute", "second"]:
+            if lookup in ['year', 'month', 'day', 'hour', 'minute', 'second']:
                 if arr:
-                    column = "DATEPART({0}, {1})__{2}".format(
-                        lookup, column, arr.pop(0)
-                    )
+                    column = "DATEPART({0}, {1})__{2}".format(lookup, column, arr.pop(0))
                     return self._process(column, value)
                 else:
-                    return "DATEPART({0}, {1})={2}".format(
-                        lookup, column, value
-                    )
+                    return "DATEPART({0}, {1})={2}".format(lookup, column, value)
 
         if lookup in self.op_map.keys():
-            return "{0}{1}{2}".format(
-                column, self.op_map[lookup], self._get_value(value)
-            )
+            return "{0}{1}{2}".format(column, self.op_map[lookup], self._get_value(value))
 
         if value is not None:
             return "{0}{1}{2}".format(column, "=", self._get_value(value))
 
         return column
 
-    def _compile(
-        self,
-    ):
+    def _compile(self,):
         filters = []
         for k, v in self.conditions.items():
             filters.append(self._process(k, v))
@@ -255,6 +226,7 @@ class Q(QMixin):
 
 
 class SQLQuery(object):
+
     def __init__(self, table=None, sql_mode="MYSQL", sql=None, **kwargs):
         self.kwargs = kwargs
         self._table = table
@@ -269,19 +241,11 @@ class SQLQuery(object):
         self._limits = None
         self._sql = sql
         self._nolock = False
-        self._distinct = False
 
-    def has_filters(self):
-        return (
-            self._order_by
-            or self._group_by
-            or self._joins
-            or self._filters
-            or self._excludes
-            or self._extra
-            or self._limits
-            or self._values != ["*"]
-        )
+    def has_filters(self,):
+        return self._order_by or self._group_by or self._joins\
+            or self._filters or self._excludes or self._extra \
+            or self._limits or self._values != ['*']
 
     def _q(self, *args, **kwargs):
         conds = Q()
@@ -295,7 +259,7 @@ class SQLQuery(object):
         _conds._mode = self.sql_mode
         return conds & _conds
 
-    def _clone(self):
+    def _clone(self,):
         return copy.deepcopy(self)
 
     def values(self, *args):
@@ -313,14 +277,9 @@ class SQLQuery(object):
         clone._filters &= self._q(*args, **kwargs)
         return clone
 
-    def distinct(self, enabled=True):
-        clone = self._clone()
-        clone._distinct = enabled
-        return clone
-
     def exclude(self, *args, **kwargs):
         clone = self._clone()
-        clone._excludes |= self._q(*args, **kwargs)
+        clone._excludes &= self._q(*args, **kwargs)
         return clone
 
     def order_by(self, *args):
@@ -340,9 +299,7 @@ class SQLQuery(object):
         clone = self._clone()
         if on:
             on = "ON " + on.format(table=self._table)
-            clone._joins.append(
-                "{how} {table} {on}".format(how=how, table=table, on=on)
-            )
+            clone._joins.append("{how} {table} {on}".format(how=how, table=table, on=on))
         return clone
 
     def extra(self, extra=None, **kwargs):
@@ -354,26 +311,30 @@ class SQLQuery(object):
         return clone
 
     def __getitem__(self, slice):
+        if isinstance(slice, str):
+            raise IndexError
+
         clone = self._clone()
         clone._limits = slice
         return clone
 
 
 class SQLCompiler(object):
-    def get_columns(self):
+
+    def get_columns(self,):
         extra_columns = self.get_extra_columns()
         columns = ", ".join(self._values)
         return ", ".join([item for item in [columns, extra_columns] if item])
 
-    def get_extra_columns(self):
+    def get_extra_columns(self,):
         return self._extra.get("select", "")
 
-    def get_extra_where(self):
+    def get_extra_where(self,):
         where = self._extra.get("where", [])
         if where:
             return " AND ".join(where)
 
-    def get_table(self):
+    def get_table(self,):
         return self._table
 
     def get_where(self):
@@ -381,13 +342,9 @@ class SQLCompiler(object):
         extra_where = self.get_extra_where()
 
         if filters or extra_where:
-            return "WHERE " + " AND ".join(
-                [item for item in [filters, extra_where] if item]
-            )
+            return "WHERE " + " AND ".join([item for item in [filters, extra_where] if item])
 
-    def get_order_by(
-        self,
-    ):
+    def get_order_by(self,):
         conds = []
         for cond in self._order_by:
             order = ""
@@ -407,22 +364,20 @@ class SQLCompiler(object):
         if conds:
             return "ORDER BY " + ", ".join(conds)
 
-    def get_group_by(
-        self,
-    ):
+    def get_group_by(self,):
         if self._group_by:
             return "GROUP BY " + ", ".join(self._group_by)
 
-    def get_joins(self):
+    def get_joins(self,):
         if self._joins:
             return "  ".join(self._joins)
 
-    def get_nolock(self):
+    def get_nolock(self,):
         if self._nolock:
             return " WITH (NOLOCK)"
         return ""
 
-    def get_limits(self):
+    def get_limits(self,):
         if self._limits and self.sql_mode != "SQL_SERVER":
             offset = self._limits.start
             limit = self._limits.stop
@@ -433,17 +388,8 @@ class SQLCompiler(object):
                 str += " OFFSET {0}".format(offset)
             return str
 
-    def get_distinct(self):
-        if self._distinct:
-            return " DISTINCT "
-        return ""
-
-    def get_top(self):
-        if (
-            self._limits
-            and self.sql_mode == "SQL_SERVER"
-            and not self._limits.start
-        ):
+    def get_top(self,):
+        if self._limits and self.sql_mode == "SQL_SERVER" and not self._limits.start:
             return "TOP {0}".format(self._limits.stop)
 
     def get_sql_structure(self):
@@ -454,27 +400,15 @@ class SQLCompiler(object):
         else:
             table = self.get_table()
 
-        sql = [
-            "SELECT",
-            self.get_distinct(),
-            self.get_top(),
-            self.get_columns(),
-            "FROM",
-            table,
-            self.get_nolock(),
-            self.get_joins(),
-            self.get_where(),
-            self.get_group_by(),
-            self.get_order_by(),
-            self.get_limits(),
-        ]
+        sql = ["SELECT", self.get_top(), self.get_columns(),
+               "FROM", table,
+               self.get_nolock(),
+               self.get_joins(), self.get_where(),
+               self.get_group_by(), self.get_order_by(),
+               self.get_limits()]
 
-        if (
-            self.sql_mode == "SQL_SERVER"
-            and self._limits
-            and self._limits.start is not None
-            and self._limits.stop is not None
-        ):
+        if self.sql_mode == "SQL_SERVER" and self._limits and \
+           self._limits.start is not None and self._limits.stop is not None:
             conds = []
             if self._limits.start is not None:
                 conds.append("row_number > %s" % self._limits.start)
@@ -483,40 +417,52 @@ class SQLCompiler(object):
                 conds.append("row_number <= %s" % self._limits.stop)
 
             conds = " AND ".join(conds)
-            paginate = (
-                "ROW_NUMBER() OVER (%s) as row_number" % self.get_order_by()
-            )
+            paginate = "ROW_NUMBER() OVER (%s) as row_number" % self.get_order_by()
 
-            return [
-                "SELECT * FROM (",
-                "SELECT",
-                ",".join([paginate, self.get_columns()]),
-                "FROM",
-                table,
-                self.get_nolock(),
-                self.get_joins(),
-                self.get_where(),
-                self.get_group_by(),
-                self.get_limits(),
-                ") as tbl_paginated ",
-                " WHERE ",
-                conds,
-            ]
+            return ["SELECT * FROM (", "SELECT", ",".join([paginate, self.get_columns()]),
+                    "FROM", table,
+                    self.get_joins(),
+                    self.get_where(),
+                    self.get_group_by(),
+                    self.get_limits(), ") as tbl_paginated WHERE ", conds]
+
+        if self.sql_mode == "ACCESS" and self._limits and \
+           self._limits.start is not None and self._limits.stop is not None:
+            conds = []
+
+            if self._limits.start is not None:
+                conds.append("row_number > %s" % self._limits.start)
+
+            if self._limits.stop is not None:
+                conds.append("row_number <= %s" % self._limits.stop)
+
+            conds = " AND ".join(conds)
+            count = "(select count(*) FROM {table} as t2 WHERE t2.{id} <= {table}.{id}) as row_number".format(table=table,
+                                                                                                              id=self._order_by[0])
+
+            return ["SELECT * FROM (", "SELECT", self.get_columns(), ",",
+                    count,
+                    # "FROM",
+                    # table,
+                    self.get_joins(),
+                    self.get_where(),
+                    self.get_group_by(),
+                    " FROM ",
+                    table,
+                    ") WHERE ", conds]
 
         return sql
 
     def _compile(self):
-        return " ".join(
-            [ensureUtf(item) for item in self.get_sql_structure() if item]
-        )
+        return " ".join([ensureUtf(item) for item in self.get_sql_structure() if item])
 
     def __repr__(self):
         return self._compile()
 
     __str__ = __repr__
 
-    @property
-    def sql(self):
+    @ property
+    def sql(self,):
         return self.__str__()
 
     def __or__(self, other):
@@ -528,6 +474,7 @@ class Queryset(SQLCompiler, SQLQuery):
 
 
 class SQLModel(object):
-    @classproperty
+
+    @ classproperty
     def objects(cls):
-        return Queryset(cls.table, getattr(cls, "sql_mode", None))
+        return Queryset(cls.table, getattr(cls, 'sql_mode', None))