feat: add new examples from pocketflow-academy

cookbook/pocketflow-tool-database/tools/database.py

@@ -0,0 +1,38 @@
+import sqlite3
+from typing import List, Tuple, Any
+
+def execute_sql(query: str, params: Tuple = None) -> List[Tuple[Any, ...]]:
+    """Execute a SQL query and return results
+    
+    Args:
+        query (str): SQL query to execute
+        params (tuple, optional): Query parameters to prevent SQL injection
+        
+    Returns:
+        list: Query results as a list of tuples
+    """
+    conn = sqlite3.connect("example.db")
+    try:
+        cursor = conn.cursor()
+        if params:
+            cursor.execute(query, params)
+        else:
+            cursor.execute(query)
+        result = cursor.fetchall()
+        conn.commit()
+        return result
+    finally:
+        conn.close()
+
+def init_db():
+    """Initialize database with example table"""
+    create_table_sql = """
+    CREATE TABLE IF NOT EXISTS tasks (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        title TEXT NOT NULL,
+        description TEXT,
+        status TEXT DEFAULT 'pending',
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+    )
+    """
+    execute_sql(create_table_sql)