/
base.py
721 lines (601 loc) · 22.9 KB
/
base.py
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import datetime
from .._compat import basestring, integer_types, string_types
from ..adapters.base import SQLAdapter
from ..helpers.methods import use_common_filters
from ..objects import Expression, Field, Select, Table
from . import Dialect, dialects, sqltype_for
long = integer_types[-1]
class CommonDialect(Dialect):
quote_template = "%s"
def _force_bigints(self):
if "big-id" in self.types and "reference" in self.types:
self.types["id"] = self.types["big-id"]
self.types["reference"] = self.types["big-reference"]
def quote(self, val):
return self.quote_template % val
def varquote(self, val):
return val
def sequence_name(self, tablename):
return self.quote("%s_sequence" % tablename)
def trigger_name(self, tablename):
return "%s_sequence" % tablename
def coalesce_zero(self, val, query_env={}):
return self.coalesce(val, [0], query_env)
@dialects.register_for(SQLAdapter)
class SQLDialect(CommonDialect):
quote_template = '"%s"'
true = "T"
false = "F"
true_exp = "1"
false_exp = "0"
dt_sep = " "
@sqltype_for("string")
def type_string(self):
return "VARCHAR(%(length)s)"
@sqltype_for("boolean")
def type_boolean(self):
return "CHAR(1)"
@sqltype_for("text")
def type_text(self):
return "TEXT"
@sqltype_for("json")
def type_json(self):
return self.types["text"]
@sqltype_for("password")
def type_password(self):
return self.types["string"]
@sqltype_for("blob")
def type_blob(self):
return "BLOB"
@sqltype_for("upload")
def type_upload(self):
return self.types["string"]
@sqltype_for("integer")
def type_integer(self):
return "INTEGER"
@sqltype_for("bigint")
def type_bigint(self):
return self.types["integer"]
@sqltype_for("float")
def type_float(self):
return "FLOAT"
@sqltype_for("double")
def type_double(self):
return "DOUBLE"
@sqltype_for("decimal")
def type_decimal(self):
return "NUMERIC(%(precision)s,%(scale)s)"
@sqltype_for("date")
def type_date(self):
return "DATE"
@sqltype_for("time")
def type_time(self):
return "TIME"
@sqltype_for("datetime")
def type_datetime(self):
return "TIMESTAMP"
@sqltype_for("id")
def type_id(self):
return "INTEGER PRIMARY KEY AUTOINCREMENT"
@sqltype_for("reference")
def type_reference(self):
return (
"INTEGER REFERENCES %(foreign_key)s "
+ "ON DELETE %(on_delete_action)s ON UPDATE %(on_update_action)s %(null)s %(unique)s"
)
@sqltype_for("list:integer")
def type_list_integer(self):
return self.types["text"]
@sqltype_for("list:string")
def type_list_string(self):
return self.types["text"]
@sqltype_for("list:reference")
def type_list_reference(self):
return self.types["text"]
@sqltype_for("big-id")
def type_big_id(self):
return self.types["id"]
@sqltype_for("big-reference")
def type_big_reference(self):
return self.types["reference"]
@sqltype_for("reference FK")
def type_reference_fk(self):
return (
', CONSTRAINT "FK_%(constraint_name)s" FOREIGN KEY '
+ "(%(field_name)s) REFERENCES %(foreign_key)s "
+ "ON DELETE %(on_delete_action)s ON UPDATE %(on_update_action)s"
)
def alias(self, original, new):
return ("%s AS " + self.quote_template) % (original, new)
def insert(self, table, fields, values):
return "INSERT INTO %s(%s) VALUES (%s);" % (table, fields, values)
def insert_empty(self, table):
return "INSERT INTO %s DEFAULT VALUES;" % table
def where(self, query):
return "WHERE %s" % query
def update(self, table, values, where=None):
tablename = self.writing_alias(table)
whr = ""
if where:
whr = " %s" % self.where(where)
return "UPDATE %s SET %s%s;" % (tablename, values, whr)
def delete(self, table, where=None):
tablename = self.writing_alias(table)
whr = ""
if where:
whr = " %s" % self.where(where)
return "DELETE FROM %s%s;" % (tablename, whr)
def cte(self, tname, fields, sql, recursive=None):
"""
recursive:list = [union_type, recursive_sql]
"""
if recursive:
r_sql_parts = ["%s %s" % (union, sql) for union, sql in recursive]
recursive = " ".join(r_sql_parts)
cte_select = "{select} {recursive}"
else:
cte_select = "{select}"
return ("{tname}({fields}) AS (%s)" % cte_select).format(
tname=tname, fields=fields, select=sql, recursive=recursive
)
def select(
self,
fields,
tables,
where=None,
groupby=None,
having=None,
orderby=None,
limitby=None,
distinct=False,
for_update=False,
with_cte=None, # ['recursive' | '', sql]
):
dst, whr, grp, order, limit, offset, upd = "", "", "", "", "", "", ""
if distinct is True:
dst = " DISTINCT"
elif distinct:
dst = " DISTINCT ON (%s)" % distinct
if where:
whr = " %s" % self.where(where)
if groupby:
grp = " GROUP BY %s" % groupby
if having:
grp += " HAVING %s" % having
if orderby:
order = " ORDER BY %s" % orderby
if limitby:
(lmin, lmax) = limitby
limit = " LIMIT %i" % (lmax - lmin)
offset = " OFFSET %i" % lmin
if for_update:
upd = " FOR UPDATE"
if with_cte:
recursive, cte = with_cte
recursive = " RECURSIVE" if recursive else ""
with_cte = "WITH%s %s " % (recursive, cte)
else:
with_cte = ""
return "%sSELECT%s %s FROM %s%s%s%s%s%s%s;" % (
with_cte,
dst,
fields,
tables,
whr,
grp,
order,
limit,
offset,
upd,
)
def count(self, val, distinct=None, query_env={}):
return ("COUNT(%s)" if not distinct else "COUNT(DISTINCT %s)") % self.expand(
val, query_env=query_env
)
def join(self, val, query_env={}):
if isinstance(val, (Table, Select)):
val = val.query_name(query_env.get("parent_scope", []))
elif not isinstance(val, basestring):
val = self.expand(val, query_env=query_env)
return "JOIN %s" % val
def left_join(self, val, query_env={}):
# Left join must always have an ON clause
if not isinstance(val, basestring):
val = self.expand(val, query_env=query_env)
return "LEFT JOIN %s" % val
def cross_join(self, val, query_env={}):
if isinstance(val, (Table, Select)):
val = val.query_name(query_env.get("parent_scope", []))
elif not isinstance(val, basestring):
val = self.expand(val, query_env=query_env)
return "CROSS JOIN %s" % val
@property
def random(self):
return "Random()"
def _as(self, first, second, query_env={}):
return "%s AS %s" % (self.expand(first, query_env=query_env), second)
def cast(self, first, second, query_env={}):
return "CAST(%s)" % self._as(first, second, query_env)
def _not(self, val, query_env={}):
return "(NOT %s)" % self.expand(val, query_env=query_env)
def _and(self, first, second, query_env={}):
return "(%s AND %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
def _or(self, first, second, query_env={}):
return "(%s OR %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
def belongs(self, first, second, query_env={}):
ftype = first.type
first = self.expand(first, query_env=query_env)
if isinstance(second, str):
return "(%s IN (%s))" % (first, second[:-1])
elif isinstance(second, Select):
if len(second._qfields) != 1:
raise ValueError("Subquery in belongs() must select exactly 1 column")
sub = second._compile(query_env.get("current_scope", []))[1][:-1]
return "(%s IN (%s))" % (first, sub)
if not second:
return "(1=0)"
items = ",".join(
self.expand(item, ftype, query_env=query_env) for item in second
)
return "(%s IN (%s))" % (first, items)
# def regexp(self, first, second):
# raise NotImplementedError
def lower(self, val, query_env={}):
return "LOWER(%s)" % self.expand(val, query_env=query_env)
def upper(self, first, query_env={}):
return "UPPER(%s)" % self.expand(first, query_env=query_env)
def like(self, first, second, escape=None, query_env={}):
"""Case sensitive like operator"""
if isinstance(second, Expression):
second = self.expand(second, "string", query_env=query_env)
else:
second = self.expand(second, "string", query_env=query_env)
if escape is None:
escape = "\\"
second = second.replace(escape, escape * 2)
return "(%s LIKE %s ESCAPE '%s')" % (
self.expand(first, query_env=query_env),
second,
escape,
)
def ilike(self, first, second, escape=None, query_env={}):
"""Case insensitive like operator"""
if isinstance(second, Expression):
second = self.expand(second, "string", query_env=query_env)
else:
second = self.expand(second, "string", query_env=query_env).lower()
if escape is None:
escape = "\\"
second = second.replace(escape, escape * 2)
return "(%s LIKE %s ESCAPE '%s')" % (
self.lower(first, query_env=query_env),
second,
escape,
)
def _like_escaper_default(self, term):
if isinstance(term, Expression):
return term
term = term.replace("\\", "\\\\")
term = term.replace(r"%", r"\%").replace("_", r"\_")
return term
def startswith(self, first, second, query_env={}):
return "(%s LIKE %s ESCAPE '\\')" % (
self.expand(first, query_env=query_env),
self.expand(
self._like_escaper_default(second) + "%", "string", query_env=query_env
),
)
def endswith(self, first, second, query_env={}):
return "(%s LIKE %s ESCAPE '\\')" % (
self.expand(first, query_env=query_env),
self.expand(
"%" + self._like_escaper_default(second), "string", query_env=query_env
),
)
def replace(self, first, tup, query_env={}):
second, third = tup
return "REPLACE(%s,%s,%s)" % (
self.expand(first, "string", query_env=query_env),
self.expand(second, "string", query_env=query_env),
self.expand(third, "string", query_env=query_env),
)
def concat(self, *items, **kwargs):
query_env = kwargs.get("query_env", {})
tmp = (self.expand(x, "string", query_env=query_env) for x in items)
return "(%s)" % " || ".join(tmp)
def contains(self, first, second, case_sensitive=True, query_env={}):
if first.type in ("string", "text", "json", "jsonb"):
if isinstance(second, Expression):
second = Expression(
second.db,
self.concat(
"%",
Expression(
second.db,
self.replace(second, (r"%", r"\%"), query_env=query_env),
),
r"%",
),
)
else:
second = "%" + self._like_escaper_default(str(second)) + r"%"
elif first.type.startswith("list:"):
if isinstance(second, Expression):
second = Expression(
second.db,
self.concat(
r"%|",
Expression(
second.db,
self.replace(
Expression(
second.db,
self.replace(second, (r"%", r"\%"), query_env),
),
("|", "||"),
),
),
r"|%",
),
)
else:
second = str(second).replace("|", "||")
second = "%|" + self._like_escaper_default(second) + "|%"
op = case_sensitive and self.like or self.ilike
return op(first, second, escape="\\", query_env=query_env)
def eq(self, first, second=None, query_env={}):
if second is None:
return "(%s IS NULL)" % self.expand(first, query_env=query_env)
if first.type in ("json", "jsonb"):
if isinstance(second, (string_types, int, float)):
return "(%s = '%s')" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
return "(%s = %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def ne(self, first, second=None, query_env={}):
if second is None:
return "(%s IS NOT NULL)" % self.expand(first, query_env=query_env)
if first.type in ("json", "jsonb"):
if isinstance(second, (string_types, int, float)):
return "(%s <> '%s')" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
return "(%s <> %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def lt(self, first, second=None, query_env={}):
if second is None:
raise RuntimeError("Cannot compare %s < None" % first)
if first.type in ("json", "jsonb"):
if isinstance(second, (string_types, int, float)):
return "(%s < '%s')" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
return "(%s < %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def lte(self, first, second=None, query_env={}):
if second is None:
raise RuntimeError("Cannot compare %s <= None" % first)
if first.type in ("json", "jsonb"):
if isinstance(second, (string_types, int, float)):
return "(%s <= '%s')" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
return "(%s <= %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def gt(self, first, second=None, query_env={}):
if second is None:
raise RuntimeError("Cannot compare %s > None" % first)
if first.type in ("json", "jsonb"):
if isinstance(second, (string_types, int, float)):
return "(%s > '%s')" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
return "(%s > %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def gte(self, first, second=None, query_env={}):
if second is None:
raise RuntimeError("Cannot compare %s >= None" % first)
if first.type in ("json", "jsonb"):
if isinstance(second, (string_types, int, float)):
return "(%s >= '%s')" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
return "(%s >= %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def _is_numerical(self, field_type):
return field_type in (
"integer",
"float",
"double",
"bigint",
"boolean",
) or field_type.startswith("decimal")
def add(self, first, second, query_env={}):
if self._is_numerical(first.type) or isinstance(first.type, Field):
return "(%s + %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
else:
return self.concat(first, second, query_env=query_env)
def sub(self, first, second, query_env={}):
return "(%s - %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def mul(self, first, second, query_env={}):
return "(%s * %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def div(self, first, second, query_env={}):
return "(%s / %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def mod(self, first, second, query_env={}):
return "(%s %% %s)" % (
self.expand(first, query_env=query_env),
self.expand(second, first.type, query_env=query_env),
)
def on(self, first, second, query_env={}):
table_rname = first.query_name(query_env.get("parent_scope", []))[0]
if use_common_filters(second):
second = self.adapter.common_filter(second, [first])
return ("%s ON %s") % (table_rname, self.expand(second, query_env=query_env))
def invert(self, first, query_env={}):
return "%s DESC" % self.expand(first, query_env=query_env)
def comma(self, first, second, query_env={}):
return "%s, %s" % (
self.expand(first, query_env=query_env),
self.expand(second, query_env=query_env),
)
def extract(self, first, what, query_env={}):
return "EXTRACT(%s FROM %s)" % (what, self.expand(first, query_env=query_env))
def epoch(self, val, query_env={}):
return self.extract(val, "epoch", query_env)
def length(self, val, query_env={}):
return "LENGTH(%s)" % self.expand(val, query_env=query_env)
def aggregate(self, first, what, query_env={}):
return "%s(%s)" % (what, self.expand(first, query_env=query_env))
def not_null(self, default, field_type):
return "NOT NULL DEFAULT %s" % self.adapter.represent(default, field_type)
@property
def allow_null(self):
return ""
def coalesce(self, first, second, query_env={}):
expressions = [self.expand(first, query_env=query_env)] + [
self.expand(val, first.type, query_env=query_env) for val in second
]
return "COALESCE(%s)" % ",".join(expressions)
def raw(self, val, query_env={}):
return val
def substring(self, field, parameters, query_env={}):
return "SUBSTR(%s,%s,%s)" % (
self.expand(field, query_env=query_env),
parameters[0],
parameters[1],
)
def case(self, query, true_false, query_env={}):
_types = {bool: "boolean", int: "integer", float: "double"}
return "CASE WHEN %s THEN %s ELSE %s END" % (
self.expand(query, query_env=query_env),
self.adapter.represent(
true_false[0], _types.get(type(true_false[0]), "string")
),
self.adapter.represent(
true_false[1], _types.get(type(true_false[1]), "string")
),
)
def primary_key(self, key):
return "PRIMARY KEY(%s)" % key
def drop_table(self, table, mode):
return ["DROP TABLE %s;" % table._rname]
def truncate(self, table, mode=""):
if mode:
mode = " %s" % mode
return ["TRUNCATE TABLE %s%s;" % (table._rname, mode)]
def create_index(self, name, table, expressions, unique=False):
uniq = " UNIQUE" if unique else ""
with self.adapter.index_expander():
rv = "CREATE%s INDEX %s ON %s (%s);" % (
uniq,
self.quote(name),
table._rname,
",".join(self.expand(field) for field in expressions),
)
return rv
def drop_index(self, name, table, if_exists=False):
if_exists = "IF EXISTS " if if_exists else ""
return "DROP INDEX %s%s;" % (if_exists, self.quote(name))
def constraint_name(self, table, fieldname):
return "%s_%s__constraint" % (table, fieldname)
def concat_add(self, tablename):
return ", ADD "
def writing_alias(self, table):
return table.sql_fullref
class NoSQLDialect(CommonDialect):
@sqltype_for("string")
def type_string(self):
return str
@sqltype_for("boolean")
def type_boolean(self):
return bool
@sqltype_for("text")
def type_text(self):
return str
@sqltype_for("json")
def type_json(self):
return self.types["text"]
@sqltype_for("password")
def type_password(self):
return self.types["string"]
@sqltype_for("blob")
def type_blob(self):
return self.types["text"]
@sqltype_for("upload")
def type_upload(self):
return self.types["string"]
@sqltype_for("integer")
def type_integer(self):
return long
@sqltype_for("bigint")
def type_bigint(self):
return self.types["integer"]
@sqltype_for("float")
def type_float(self):
return float
@sqltype_for("double")
def type_double(self):
return self.types["float"]
@sqltype_for("date")
def type_date(self):
return datetime.date
@sqltype_for("time")
def type_time(self):
return datetime.time
@sqltype_for("datetime")
def type_datetime(self):
return datetime.datetime
@sqltype_for("id")
def type_id(self):
return long
@sqltype_for("reference")
def type_reference(self):
return long
@sqltype_for("list:integer")
def type_list_integer(self):
return list
@sqltype_for("list:string")
def type_list_string(self):
return list
@sqltype_for("list:reference")
def type_list_reference(self):
return list
def quote(self, val):
return val