Ability to introspect and run queries against views (#55)

* db.views_names() method and and db.views property
* Separate View and Table classes, both subclassing new Queryable class
* view.drop() method
* Updated documentation

tests/test_create.py

@@ -782,3 +782,10 @@ def test_drop(fresh_db):
     assert ["t"] == fresh_db.table_names()
     assert None is fresh_db["t"].drop()
     assert [] == fresh_db.table_names()
+
+
+def test_drop_view(fresh_db):
+    fresh_db.create_view("foo_view", "select 1")
+    assert ["foo_view"] == fresh_db.view_names()
+    assert None is fresh_db["foo_view"].drop()
+    assert [] == fresh_db.view_names()

tests/test_introspect.py

@@ -1,4 +1,4 @@
-from sqlite_utils.db import Index
+from sqlite_utils.db import Index, View
 import pytest
 
 
@@ -6,6 +6,11 @@ def test_table_names(existing_db):
     assert ["foo"] == existing_db.table_names()
 
 
+def test_view_names(fresh_db):
+    fresh_db.create_view("foo_view", "select 1")
+    assert ["foo_view"] == fresh_db.view_names()
+
+
 def test_table_names_fts4(existing_db):
     existing_db["woo"].insert({"title": "Hello"}).enable_fts(
         ["title"], fts_version="FTS4"
@@ -36,6 +41,16 @@ def test_tables(existing_db):
     assert "foo" == existing_db.tables[0].name
 
 
+def test_views(fresh_db):
+    fresh_db.create_view("foo_view", "select 1")
+    assert 1 == len(fresh_db.views)
+    view = fresh_db.views[0]
+    assert isinstance(view, View)
+    assert "foo_view" == view.name
+    assert "<View foo_view (1)>" == repr(view)
+    assert {"1": str} == view.columns_dict
+
+
 def test_count(existing_db):
     assert 3 == existing_db["foo"].count