import sqlite3

class SchemaAnalyzer:
    """Analyzes database schema"""
    
    def __init__(self, db_path='sample.db'):
        self.db_path = db_path
    
    def get_schema(self):
        """Get complete database schema"""
        conn = sqlite3.connect(self.db_path)
        cursor = conn.cursor()
        
        # Get all tables
        cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
        tables = [row[0] for row in cursor.fetchall()]
        
        schema = {}
        for table in tables:
            cursor.execute(f"PRAGMA table_info({table})")
            columns = []
            for row in cursor.fetchall():
                columns.append({
                    "name": row[1],
                    "type": row[2],
                    "nullable": not row[3],
                    "primary_key": bool(row[5])
                })
            schema[table] = columns
        
        conn.close()
        return schema