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import testbase
from sqlalchemy import *
from testlib import *
from sqlalchemy.sql.visitors import *
class TraversalTest(AssertMixin):
"""test ClauseVisitor's traversal, particularly its ability to copy and modify
a ClauseElement in place."""
def setUpAll(self):
global A, B
# establish two ficticious ClauseElements.
# define deep equality semantics as well as deep identity semantics.
class A(ClauseElement):
def __init__(self, expr):
self.expr = expr
def is_other(self, other):
return other is self
def __eq__(self, other):
return other.expr == self.expr
def __ne__(self, other):
return other.expr != self.expr
def __str__(self):
return "A(%s)" % repr(self.expr)
class B(ClauseElement):
def __init__(self, *items):
self.items = items
def is_other(self, other):
if other is not self:
return False
for i1, i2 in zip(self.items, other.items):
if i1 is not i2:
return False
return True
def __eq__(self, other):
for i1, i2 in zip(self.items, other.items):
if i1 != i2:
return False
return True
def __ne__(self, other):
for i1, i2 in zip(self.items, other.items):
if i1 != i2:
return True
return False
def _copy_internals(self):
self.items = [i._clone() for i in self.items]
def get_children(self, **kwargs):
return self.items
def __str__(self):
return "B(%s)" % repr([str(i) for i in self.items])
def test_test_classes(self):
a1 = A("expr1")
struct = B(a1, A("expr2"), B(A("expr1b"), A("expr2b")), A("expr3"))
struct2 = B(a1, A("expr2"), B(A("expr1b"), A("expr2b")), A("expr3"))
struct3 = B(a1, A("expr2"), B(A("expr1b"), A("expr2bmodified")), A("expr3"))
assert a1.is_other(a1)
assert struct.is_other(struct)
assert struct == struct2
assert struct != struct3
assert not struct.is_other(struct2)
assert not struct.is_other(struct3)
def test_clone(self):
struct = B(A("expr1"), A("expr2"), B(A("expr1b"), A("expr2b")), A("expr3"))
class Vis(ClauseVisitor):
def visit_a(self, a):
pass
def visit_b(self, b):
pass
vis = Vis()
s2 = vis.traverse(struct, clone=True)
assert struct == s2
assert not struct.is_other(s2)
def test_no_clone(self):
struct = B(A("expr1"), A("expr2"), B(A("expr1b"), A("expr2b")), A("expr3"))
class Vis(ClauseVisitor):
def visit_a(self, a):
pass
def visit_b(self, b):
pass
vis = Vis()
s2 = vis.traverse(struct, clone=False)
assert struct == s2
assert struct.is_other(s2)
def test_change_in_place(self):
struct = B(A("expr1"), A("expr2"), B(A("expr1b"), A("expr2b")), A("expr3"))
struct2 = B(A("expr1"), A("expr2modified"), B(A("expr1b"), A("expr2b")), A("expr3"))
struct3 = B(A("expr1"), A("expr2"), B(A("expr1b"), A("expr2bmodified")), A("expr3"))
class Vis(ClauseVisitor):
def visit_a(self, a):
if a.expr == "expr2":
a.expr = "expr2modified"
def visit_b(self, b):
pass
vis = Vis()
s2 = vis.traverse(struct, clone=True)
assert struct != s2
assert not struct.is_other(s2)
assert struct2 == s2
class Vis2(ClauseVisitor):
def visit_a(self, a):
if a.expr == "expr2b":
a.expr = "expr2bmodified"
def visit_b(self, b):
pass
vis2 = Vis2()
s3 = vis2.traverse(struct, clone=True)
assert struct != s3
assert struct3 == s3
class ClauseTest(SQLCompileTest):
"""test copy-in-place behavior of various ClauseElements."""
def setUpAll(self):
global t1, t2
t1 = table("table1",
column("col1"),
column("col2"),
column("col3"),
)
t2 = table("table2",
column("col1"),
column("col2"),
column("col3"),
)
def test_binary(self):
clause = t1.c.col2 == t2.c.col2
assert str(clause) == ClauseVisitor().traverse(clause, clone=True)
def test_join(self):
clause = t1.join(t2, t1.c.col2==t2.c.col2)
c1 = str(clause)
assert str(clause) == str(ClauseVisitor().traverse(clause, clone=True))
class Vis(ClauseVisitor):
def visit_binary(self, binary):
binary.right = t2.c.col3
clause2 = Vis().traverse(clause, clone=True)
assert c1 == str(clause)
assert str(clause2) == str(t1.join(t2, t1.c.col2==t2.c.col3))
def test_select(self):
s2 = select([t1])
s2_assert = str(s2)
s3_assert = str(select([t1], t1.c.col2==7))
class Vis(ClauseVisitor):
def visit_select(self, select):
select.append_whereclause(t1.c.col2==7)
s3 = Vis().traverse(s2, clone=True)
assert str(s3) == s3_assert
assert str(s2) == s2_assert
print str(s2)
print str(s3)
Vis().traverse(s2)
assert str(s2) == s3_assert
print "------------------"
s4_assert = str(select([t1], and_(t1.c.col2==7, t1.c.col3==9)))
class Vis(ClauseVisitor):
def visit_select(self, select):
select.append_whereclause(t1.c.col3==9)
s4 = Vis().traverse(s3, clone=True)
print str(s3)
print str(s4)
assert str(s4) == s4_assert
assert str(s3) == s3_assert
print "------------------"
s5_assert = str(select([t1], and_(t1.c.col2==7, t1.c.col1==9)))
class Vis(ClauseVisitor):
def visit_binary(self, binary):
if binary.left is t1.c.col3:
binary.left = t1.c.col1
binary.right = bindparam("table1_col1")
s5 = Vis().traverse(s4, clone=True)
print str(s4)
print str(s5)
assert str(s5) == s5_assert
assert str(s4) == s4_assert
def test_correlated_select(self):
s = select(['*'], t1.c.col1==t2.c.col1, from_obj=[t1, t2]).correlate(t2)
class Vis(ClauseVisitor):
def visit_select(self, select):
select.append_whereclause(t1.c.col2==7)
self.assert_compile(Vis().traverse(s, clone=True), "SELECT * FROM table1 WHERE table1.col1 = table2.col1 AND table1.col2 = :table1_col2")
def test_clause_adapter(self):
from sqlalchemy.sql import util as sql_util
t1alias = t1.alias('t1alias')
vis = sql_util.ClauseAdapter(t1alias)
ff = vis.traverse(func.count(t1.c.col1).label('foo'), clone=True)
assert ff._get_from_objects() == [t1alias]
self.assert_compile(vis.traverse(select(['*'], from_obj=[t1]), clone=True), "SELECT * FROM table1 AS t1alias")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2), clone=True), "SELECT * FROM table1 AS t1alias, table2 WHERE t1alias.col1 = table2.col2")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2, from_obj=[t1, t2]), clone=True), "SELECT * FROM table1 AS t1alias, table2 WHERE t1alias.col1 = table2.col2")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2, from_obj=[t1, t2]).correlate(t1), clone=True), "SELECT * FROM table2 WHERE t1alias.col1 = table2.col2")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2, from_obj=[t1, t2]).correlate(t2), clone=True), "SELECT * FROM table1 AS t1alias WHERE t1alias.col1 = table2.col2")
ff = vis.traverse(func.count(t1.c.col1).label('foo'), clone=True)
self.assert_compile(ff, "count(t1alias.col1) AS foo")
assert ff._get_from_objects() == [t1alias]
# TODO:
# self.assert_compile(vis.traverse(select([func.count(t1.c.col1).label('foo')]), clone=True), "SELECT count(t1alias.col1) AS foo FROM table1 AS t1alias")
t2alias = t2.alias('t2alias')
vis.chain(sql_util.ClauseAdapter(t2alias))
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2), clone=True), "SELECT * FROM table1 AS t1alias, table2 AS t2alias WHERE t1alias.col1 = t2alias.col2")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2, from_obj=[t1, t2]), clone=True), "SELECT * FROM table1 AS t1alias, table2 AS t2alias WHERE t1alias.col1 = t2alias.col2")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2, from_obj=[t1, t2]).correlate(t1), clone=True), "SELECT * FROM table2 AS t2alias WHERE t1alias.col1 = t2alias.col2")
self.assert_compile(vis.traverse(select(['*'], t1.c.col1==t2.c.col2, from_obj=[t1, t2]).correlate(t2), clone=True), "SELECT * FROM table1 AS t1alias WHERE t1alias.col1 = t2alias.col2")
class SelectTest(SQLCompileTest):
"""tests the generative capability of Select"""
def setUpAll(self):
global t1, t2
t1 = table("table1",
column("col1"),
column("col2"),
column("col3"),
)
t2 = table("table2",
column("col1"),
column("col2"),
column("col3"),
)
def test_select(self):
self.assert_compile(t1.select().where(t1.c.col1==5).order_by(t1.c.col3), "SELECT table1.col1, table1.col2, table1.col3 FROM table1 WHERE table1.col1 = :table1_col1 ORDER BY table1.col3")
self.assert_compile(t1.select().select_from(select([t2], t2.c.col1==t1.c.col1)).order_by(t1.c.col3), "SELECT table1.col1, table1.col2, table1.col3 FROM table1, (SELECT table2.col1 AS col1, table2.col2 AS col2, table2.col3 AS col3 FROM table2 WHERE table2.col1 = table1.col1) ORDER BY table1.col3")
s = select([t2], t2.c.col1==t1.c.col1, correlate=False)
s = s.correlate(t1).order_by(t2.c.col3)
self.assert_compile(t1.select().select_from(s).order_by(t1.c.col3), "SELECT table1.col1, table1.col2, table1.col3 FROM table1, (SELECT table2.col1 AS col1, table2.col2 AS col2, table2.col3 AS col3 FROM table2 WHERE table2.col1 = table1.col1 ORDER BY table2.col3) ORDER BY table1.col3")
if __name__ == '__main__':
testbase.main()
|
