notebook

find_empty_tables.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import fdb
+from pathlib import Path
+
+# ================== CONFIG ==================
+DB_PATH = r"u:\MEDICUS 3\data\medicus.FDB"
+HOST = "localhost"
+USER = "sysdba"
+PASSWORD = "masterkey"
+LOG_FILE = Path("dropped_tables_with_deps.txt")
+# ============================================
+
+con = fdb.connect(
+    host=HOST,
+    database=DB_PATH,
+    user=USER,
+    password=PASSWORD,
+    charset="WIN1250",
+)
+cur = con.cursor()
+
+print("🔍 Checking tables for emptiness and dependencies...")
+
+# All user tables
+cur.execute("""
+    SELECT TRIM(rdb$relation_name)
+    FROM rdb$relations
+    WHERE rdb$system_flag = 0
+    ORDER BY 1
+""")
+tables = [r[0] for r in cur.fetchall()]
+
+dropped = []
+skipped = []
+
+def drop_fk_constraints_referring_to(table_name: str):
+    # Find all FKs that reference this table (PK or UNIQUE)
+    cur.execute(f"""
+        SELECT TRIM(rc.rdb$relation_name), TRIM(rc.rdb$constraint_name)
+        FROM rdb$relation_constraints rc
+        JOIN rdb$ref_constraints ref ON ref.rdb$constraint_name = rc.rdb$constraint_name
+        JOIN rdb$relation_constraints pk ON pk.rdb$constraint_name = ref.rdb$const_name_uq
+        WHERE rc.rdb$constraint_type = 'FOREIGN KEY'
+          AND UPPER(pk.rdb$relation_name) = '{table_name.upper()}'
+    """)
+    for fk_table, fk_name in cur.fetchall():
+        stmt = f'ALTER TABLE {fk_table} DROP CONSTRAINT {fk_name}'
+        try:
+            print(f"   🔧 Dropping FK {fk_name} in {fk_table}")
+            con.execute_immediate(stmt)
+            con.commit()  # commit each FK drop
+        except Exception as e:
+            print(f"      ⚠️  Could not drop FK {fk_name} in {fk_table}: {e}")
+            con.rollback()
+
+for t in tables:
+    try:
+        # Count rows
+        cur.execute(f"SELECT COUNT(*) FROM {t}")
+        count = cur.fetchone()[0]
+        if count > 0:
+            continue
+
+        print(f"\n🧹 {t} → empty")
+
+        # 1) Drop FKs that reference this table
+        drop_fk_constraints_referring_to(t)
+
+        # 2) Try to drop the table itself
+        try:
+            con.execute_immediate(f"DROP TABLE {t}")
+            con.commit()  # commit this table drop
+            dropped.append(t)
+            print(f"   ✅ Dropped table {t}")
+        except Exception as e:
+            print(f"   ⚠️  Could not drop {t}: {e}")
+            con.rollback()
+            skipped.append(t)
+
+    except Exception as e:
+        print(f"⚠️  Skipping {t}: {e}")
+
+con.close()
+
+LOG_FILE.write_text("\n".join(dropped), encoding="utf-8")
+print("\n✅ Done.")
+print(f"Total dropped: {len(dropped)}")
+print(f"Skipped: {len(skipped)}")
+print(f"List saved to {LOG_FILE.resolve()}")