Add support for query parameters, JOINs, SELECT * and three-part table names

tests/test_engine.py

@@ -1,5 +1,4 @@
 import sqlite3
-from pathlib import Path
 
 import pytest
 from sqlalchemy import create_engine
@@ -215,16 +214,60 @@ def test_delete_raises_readonly(engine):
         engine.execute("DELETE FROM products WHERE id = '1'")
 
 
-def test_join_raises_unsupported(engine):
+def test_ambiguous_unqualified_join_column_raises(engine):
     with pytest.raises(UnsupportedQueryError):
         engine.execute(
-            "SELECT p.name, o.qty FROM products p JOIN orders o ON p.id = o.product_id"
+            "SELECT name FROM products p JOIN orders o ON p.id = o.product_id"
         )
 
 
-def test_select_star_raises_unsupported(engine):
-    with pytest.raises(UnsupportedQueryError):
-        engine.execute("SELECT * FROM products")
+# ---------------------------------------------------------------------------
+# R1 — parametrized queries
+# ---------------------------------------------------------------------------
+
+def test_positional_param(engine):
+    rows = engine.execute("SELECT id, name FROM products WHERE id = ?", ("1",))
+    assert rows == [{"id": "1", "name": "Widget"}]
+
+
+def test_named_param(engine):
+    rows = engine.execute("SELECT name FROM products WHERE id = :id", {"id": "2"})
+    assert rows == [{"name": "Gadget"}]
+
+
+# ---------------------------------------------------------------------------
+# R2 — JOIN support
+# ---------------------------------------------------------------------------
+
+def test_join_two_tables(engine):
+    rows = engine.execute(
+        "SELECT p.name, o.qty FROM products p "
+        "JOIN orders o ON p.id = o.product_id WHERE p.id = ?",
+        ("1",),
+    )
+    assert rows == [{"name": "Widget", "qty": "2"}]
+
+
+def test_join_caches_both_tables(engine):
+    engine.execute(
+        "SELECT p.name, o.qty FROM products p JOIN orders o ON p.id = o.product_id"
+    )
+    assert engine._cache.is_table_cached("products") is True
+    assert engine._cache.is_table_cached("orders") is True
+
+
+# ---------------------------------------------------------------------------
+# R3 — SELECT *
+# ---------------------------------------------------------------------------
+
+def test_select_star_returns_all_columns(engine):
+    rows = engine.execute("SELECT * FROM products WHERE id = '1'")
+    assert rows == [{"id": "1", "name": "Widget", "price": "9.99"}]
+
+
+def test_select_star_marks_table_full(engine):
+    engine.execute("SELECT * FROM products")
+    assert engine._cache.is_table_full("products") is True
 
 
 # ---------------------------------------------------------------------------