/usr/lib/python2.7/dist-packages/twext/enterprise/dal/test/test_parseschema.py is in calendarserver 5.2+dfsg-1.
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# Copyright (c) 2010-2014 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
"""
Tests for parsing an SQL schema, which cover L{twext.enterprise.dal.model}
and L{twext.enterprise.dal.parseschema}.
"""
from twext.enterprise.dal.model import Schema
from twext.enterprise.dal.syntax import CompoundComparison, ColumnSyntax
from twext.enterprise.dal.parseschema import addSQLToSchema
from twisted.trial.unittest import TestCase
class SchemaTestHelper(object):
"""
Mix-in that can parse a schema from a string.
"""
def schemaFromString(self, string):
"""
Createa a L{Schema}
"""
s = Schema(self.id())
addSQLToSchema(s, string)
return s
class ParsingExampleTests(TestCase, SchemaTestHelper):
"""
Tests for parsing some sample schemas.
"""
def test_simplest(self):
"""
Parse an extremely simple schema with one table in it.
"""
s = self.schemaFromString("create table foo (bar integer);")
self.assertEquals(len(s.tables), 1)
foo = s.tableNamed('foo')
self.assertEquals(len(foo.columns), 1)
bar = foo.columns[0]
self.assertEquals(bar.name, "bar")
self.assertEquals(bar.type.name, "integer")
def test_stringTypes(self):
"""
Table and column names should be byte strings.
"""
s = self.schemaFromString("create table foo (bar integer);")
self.assertEquals(len(s.tables), 1)
foo = s.tableNamed('foo')
self.assertIsInstance(foo.name, str)
self.assertIsInstance(foo.columnNamed('bar').name, str)
def test_typeWithLength(self):
"""
Parse a type with a length.
"""
s = self.schemaFromString("create table foo (bar varchar(6543))")
bar = s.tableNamed('foo').columnNamed('bar')
self.assertEquals(bar.type.name, "varchar")
self.assertEquals(bar.type.length, 6543)
def test_sequence(self):
"""
Parsing a 'create sequence' statement adds a L{Sequence} to the
L{Schema}.
"""
s = self.schemaFromString("create sequence myseq;")
self.assertEquals(len(s.sequences), 1)
self.assertEquals(s.sequences[0].name, "myseq")
def test_sequenceColumn(self):
"""
Parsing a 'create sequence' statement adds a L{Sequence} to the
L{Schema}, and then a table that contains a column which uses the SQL
C{nextval()} function to retrieve its default value from that sequence,
will cause the L{Column} object to refer to the L{Sequence} and vice
versa.
"""
s = self.schemaFromString(
"""
create sequence thingy;
create table thetable (
thecolumn integer default nextval('thingy')
);
""")
self.assertEquals(len(s.sequences), 1)
self.assertEquals(s.sequences[0].name, "thingy")
self.assertEquals(s.tables[0].columns[0].default, s.sequences[0])
self.assertEquals(s.sequences[0].referringColumns,
[s.tables[0].columns[0]])
def test_sequenceDefault(self):
"""
Default sequence column.
"""
s = self.schemaFromString(
"""
create sequence alpha;
create table foo (
bar integer default nextval('alpha') not null,
qux integer not null
);
""")
self.assertEquals(s.tableNamed("foo").columnNamed("bar").needsValue(),
False)
def test_sequenceDefaultWithParens(self):
"""
SQLite requires 'default' expression to be in parentheses, and that
should be equivalent on other databases; we should be able to parse
that too.
"""
s = self.schemaFromString(
"""
create sequence alpha;
create table foo (
bar integer default (nextval('alpha')) not null,
qux integer not null
);
"""
)
self.assertEquals(s.tableNamed("foo").columnNamed("bar").needsValue(),
False)
def test_defaultConstantColumns(self):
"""
Parsing a 'default' column with an appropriate type in it will return
that type as the 'default' attribute of the Column object.
"""
s = self.schemaFromString(
"""
create table a (
b integer default 4321,
c boolean default false,
d boolean default true,
e varchar(255) default 'sample value',
f varchar(255) default null
);
""")
table = s.tableNamed("a")
self.assertEquals(table.columnNamed("b").default, 4321)
self.assertEquals(table.columnNamed("c").default, False)
self.assertEquals(table.columnNamed("d").default, True)
self.assertEquals(table.columnNamed("e").default, 'sample value')
self.assertEquals(table.columnNamed("f").default, None)
def test_needsValue(self):
"""
Columns with defaults, or with a 'not null' constraint don't need a
value; columns without one don't.
"""
s = self.schemaFromString(
"""
create table a (
b integer default 4321 not null,
c boolean default false,
d integer not null,
e integer
)
""")
table = s.tableNamed("a")
# Has a default, NOT NULL.
self.assertEquals(table.columnNamed("b").needsValue(), False)
# Has a default _and_ nullable.
self.assertEquals(table.columnNamed("c").needsValue(), False)
# No default, not nullable.
self.assertEquals(table.columnNamed("d").needsValue(), True)
# Just nullable.
self.assertEquals(table.columnNamed("e").needsValue(), False)
def test_notNull(self):
"""
A column with a NOT NULL constraint in SQL will be parsed as a
constraint which returns False from its C{canBeNull()} method.
"""
s = self.schemaFromString(
"create table alpha (beta integer, gamma integer not null);"
)
t = s.tableNamed('alpha')
self.assertEquals(True, t.columnNamed('beta').canBeNull())
self.assertEquals(False, t.columnNamed('gamma').canBeNull())
def test_unique(self):
"""
A column with a UNIQUE constraint in SQL will result in the table
listing that column as a unique set.
"""
for identicalSchema in [
"create table sample (example integer unique);",
"create table sample (example integer, unique (example));",
"create table sample "
"(example integer, constraint unique_example unique (example))"]:
s = self.schemaFromString(identicalSchema)
table = s.tableNamed('sample')
column = table.columnNamed('example')
self.assertEquals(list(table.uniques()), [[column]])
def test_checkExpressionConstraint(self):
"""
A column with a CHECK constraint in SQL that uses an inequality will
result in a L{Check} constraint being added to the L{Table} object.
"""
def checkOneConstraint(sqlText, checkName=None):
s = self.schemaFromString(sqlText)
table = s.tableNamed('sample')
self.assertEquals(len(table.constraints), 1)
constraint = table.constraints[0]
expr = constraint.expression
self.assertIsInstance(expr, CompoundComparison)
self.assertEqual(expr.a.model, table.columnNamed('example'))
self.assertEqual(expr.b.value, 5)
self.assertEqual(expr.op, '>')
self.assertEqual(constraint.name, checkName)
checkOneConstraint(
"create table sample (example integer check (example > 5));"
)
checkOneConstraint(
"create table sample (example integer, check (example > 5));"
)
checkOneConstraint(
"create table sample "
"(example integer, constraint gt_5 check (example>5))", "gt_5"
)
def test_checkKeywordConstraint(self):
"""
A column with a CHECK constraint in SQL that compares with a keyword
expression such as 'lower' will result in a L{Check} constraint being
added to the L{Table} object.
"""
def checkOneConstraint(sqlText):
s = self.schemaFromString(sqlText)
table = s.tableNamed('sample')
self.assertEquals(len(table.constraints), 1)
expr = table.constraints[0].expression
self.assertEquals(expr.a.model, table.columnNamed("example"))
self.assertEquals(expr.op, "=")
self.assertEquals(expr.b.function.name, "lower")
self.assertEquals(
expr.b.args,
tuple([ColumnSyntax(table.columnNamed("example"))])
)
checkOneConstraint(
"create table sample "
"(example integer check (example = lower (example)));"
)
def test_multiUnique(self):
"""
A column with a UNIQUE constraint in SQL will result in the table
listing that column as a unique set.
"""
s = self.schemaFromString(
"create table a (b integer, c integer, unique (b, c), unique (c));"
)
a = s.tableNamed('a')
b = a.columnNamed('b')
c = a.columnNamed('c')
self.assertEquals(list(a.uniques()), [[b, c], [c]])
def test_singlePrimaryKey(self):
"""
A table with a multi-column PRIMARY KEY clause will be parsed as a list
of a single L{Column} object and stored as a C{primaryKey} attribute on
the L{Table} object.
"""
s = self.schemaFromString(
"create table a (b integer primary key, c integer)"
)
a = s.tableNamed("a")
self.assertEquals(a.primaryKey, [a.columnNamed("b")])
def test_multiPrimaryKey(self):
"""
A table with a multi-column PRIMARY KEY clause will be parsed as a list
C{primaryKey} attribute on the Table object.
"""
s = self.schemaFromString(
"create table a (b integer, c integer, primary key (b, c))"
)
a = s.tableNamed("a")
self.assertEquals(
a.primaryKey, [a.columnNamed("b"), a.columnNamed("c")]
)
def test_deleteAction(self):
"""
A column with an 'on delete cascade' constraint will have its C{cascade}
attribute set to True.
"""
s = self.schemaFromString(
"""
create table a1 (b1 integer primary key);
create table c2 (d2 integer references a1 on delete cascade);
create table e3 (f3 integer references a1 on delete set null);
create table g4 (h4 integer references a1 on delete set default);
""")
self.assertEquals(s.tableNamed("a1").columnNamed("b1").deleteAction, None)
self.assertEquals(s.tableNamed("c2").columnNamed("d2").deleteAction, "cascade")
self.assertEquals(s.tableNamed("e3").columnNamed("f3").deleteAction, "set null")
self.assertEquals(s.tableNamed("g4").columnNamed("h4").deleteAction, "set default")
def test_indexes(self):
"""
A 'create index' statement will add an L{Index} object to a L{Schema}'s
C{indexes} list.
"""
s = self.schemaFromString(
"""
create table q (b integer); -- noise
create table a (b integer primary key, c integer);
create table z (c integer); -- make sure we get the right table
create index idx_a_b on a(b);
create index idx_a_b_c on a (c, b);
create index idx_c on z using btree (c);
""")
a = s.tableNamed("a")
b = s.indexNamed("idx_a_b")
bc = s.indexNamed('idx_a_b_c')
self.assertEquals(b.table, a)
self.assertEquals(b.columns, [a.columnNamed("b")])
self.assertEquals(bc.table, a)
self.assertEquals(bc.columns, [a.columnNamed("c"), a.columnNamed("b")])
def test_pseudoIndexes(self):
"""
A implicit and explicit indexes are listed.
"""
s = self.schemaFromString(
"""
create table q (b integer); -- noise
create table a (b integer primary key, c integer);
create table z (c integer, unique(c) );
create unique index idx_a_c on a(c);
create index idx_a_b_c on a (c, b);
""")
self.assertEqual(set([pseudo.name for pseudo in s.pseudoIndexes()]), set((
"a-unique:(c)",
"a:(c,b)",
"a-unique:(b)",
"z-unique:(c)",
)))
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