高级 SQLite 会话

AdvancedSQLiteSession 是基础 SQLiteSession 的增强版本，提供包括会话分支、详细使用情况分析以及结构化会话查询在内的高级会话管理能力。

功能

• 会话分支: 可从任意用户消息创建替代会话路径
• 使用情况追踪: 每轮详细的 token 使用分析，并提供完整的 JSON 明细
• 结构化查询: 按轮次获取会话、工具使用统计等
• 分支管理: 独立的分支切换与管理
• 消息结构元数据: 追踪消息类型、工具使用与会话流

快速开始

from agents import Agent, Runner
from agents.extensions.memory import AdvancedSQLiteSession

# Create agent
agent = Agent(
    name="Assistant",
    instructions="Reply very concisely.",
)

# Create an advanced session
session = AdvancedSQLiteSession(
    session_id="conversation_123",
    db_path="conversations.db",
    create_tables=True
)

# First conversation turn
result = await Runner.run(
    agent,
    "What city is the Golden Gate Bridge in?",
    session=session
)
print(result.final_output)  # "San Francisco"

# IMPORTANT: Store usage data
await session.store_run_usage(result)

# Continue conversation
result = await Runner.run(
    agent,
    "What state is it in?",
    session=session
)
print(result.final_output)  # "California"
await session.store_run_usage(result)

初始化

from agents.extensions.memory import AdvancedSQLiteSession

# Basic initialization
session = AdvancedSQLiteSession(
    session_id="my_conversation",
    create_tables=True  # Auto-create advanced tables
)

# With persistent storage
session = AdvancedSQLiteSession(
    session_id="user_123",
    db_path="path/to/conversations.db",
    create_tables=True
)

# With custom logger
import logging
logger = logging.getLogger("my_app")
session = AdvancedSQLiteSession(
    session_id="session_456",
    create_tables=True,
    logger=logger
)

参数

• session_id (str): 会话的唯一标识符
• db_path (str | Path): SQLite 数据库文件路径。默认 :memory: 使用内存存储
• create_tables (bool): 是否自动创建高级表。默认 False
• logger (logging.Logger | None): 会话的自定义 logger。默认使用模块 logger

使用情况追踪

AdvancedSQLiteSession 通过按会话轮次存储 token 使用数据，提供详细的使用分析。这完全依赖在每次智能体运行后调用 store_run_usage 方法。

存储使用数据

# After each agent run, store the usage data
result = await Runner.run(agent, "Hello", session=session)
await session.store_run_usage(result)

# This stores:
# - Total tokens used
# - Input/output token breakdown
# - Request count
# - Detailed JSON token information (if available)

获取使用统计

# Get session-level usage (all branches)
session_usage = await session.get_session_usage()
if session_usage:
    print(f"Total requests: {session_usage['requests']}")
    print(f"Total tokens: {session_usage['total_tokens']}")
    print(f"Input tokens: {session_usage['input_tokens']}")
    print(f"Output tokens: {session_usage['output_tokens']}")
    print(f"Total turns: {session_usage['total_turns']}")

# Get usage for specific branch
branch_usage = await session.get_session_usage(branch_id="main")

# Get usage by turn
turn_usage = await session.get_turn_usage()
for turn_data in turn_usage:
    print(f"Turn {turn_data['user_turn_number']}: {turn_data['total_tokens']} tokens")
    if turn_data['input_tokens_details']:
        print(f"  Input details: {turn_data['input_tokens_details']}")
    if turn_data['output_tokens_details']:
        print(f"  Output details: {turn_data['output_tokens_details']}")

# Get usage for specific turn
turn_2_usage = await session.get_turn_usage(user_turn_number=2)

会话分支

AdvancedSQLiteSession 的关键特性之一是可以从任意用户消息创建会话分支，从而探索替代的会话路径。

创建分支

# Get available turns for branching
turns = await session.get_conversation_turns()
for turn in turns:
    print(f"Turn {turn['turn']}: {turn['content']}")
    print(f"Can branch: {turn['can_branch']}")

# Create a branch from turn 2
branch_id = await session.create_branch_from_turn(2)
print(f"Created branch: {branch_id}")

# Create a branch with custom name
branch_id = await session.create_branch_from_turn(
    2, 
    branch_name="alternative_path"
)

# Create branch by searching for content
branch_id = await session.create_branch_from_content(
    "weather", 
    branch_name="weather_focus"
)

分支管理

# List all branches
branches = await session.list_branches()
for branch in branches:
    current = " (current)" if branch["is_current"] else ""
    print(f"{branch['branch_id']}: {branch['user_turns']} turns, {branch['message_count']} messages{current}")

# Switch between branches
await session.switch_to_branch("main")
await session.switch_to_branch(branch_id)

# Delete a branch
await session.delete_branch(branch_id, force=True)  # force=True allows deleting current branch

分支工作流示例

# Original conversation
result = await Runner.run(agent, "What's the capital of France?", session=session)
await session.store_run_usage(result)

result = await Runner.run(agent, "What's the weather like there?", session=session)
await session.store_run_usage(result)

# Create branch from turn 2 (weather question)
branch_id = await session.create_branch_from_turn(2, "weather_focus")

# Continue in new branch with different question
result = await Runner.run(
    agent, 
    "What are the main tourist attractions in Paris?", 
    session=session
)
await session.store_run_usage(result)

# Switch back to main branch
await session.switch_to_branch("main")

# Continue original conversation
result = await Runner.run(
    agent, 
    "How expensive is it to visit?", 
    session=session
)
await session.store_run_usage(result)

结构化查询

AdvancedSQLiteSession 提供多种方法来分析会话结构与内容。

会话分析

# Get conversation organized by turns
conversation_by_turns = await session.get_conversation_by_turns()
for turn_num, items in conversation_by_turns.items():
    print(f"Turn {turn_num}: {len(items)} items")
    for item in items:
        if item["tool_name"]:
            print(f"  - {item['type']} (tool: {item['tool_name']})")
        else:
            print(f"  - {item['type']}")

# Get tool usage statistics
tool_usage = await session.get_tool_usage()
for tool_name, count, turn in tool_usage:
    print(f"{tool_name}: used {count} times in turn {turn}")

# Find turns by content
matching_turns = await session.find_turns_by_content("weather")
for turn in matching_turns:
    print(f"Turn {turn['turn']}: {turn['content']}")

消息结构

会话会自动追踪消息结构，包括：

• 消息类型（user、assistant、tool_call 等）
• 工具调用中的工具名称
• 轮次编号与序号
• 分支关联
• 时间戳

数据库模式

AdvancedSQLiteSession 在基础 SQLite 模式上扩展了两个附加表：

message_structure 表

CREATE TABLE message_structure (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_id TEXT NOT NULL,
    message_id INTEGER NOT NULL,
    branch_id TEXT NOT NULL DEFAULT 'main',
    message_type TEXT NOT NULL,
    sequence_number INTEGER NOT NULL,
    user_turn_number INTEGER,
    branch_turn_number INTEGER,
    tool_name TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (session_id) REFERENCES agent_sessions(session_id) ON DELETE CASCADE,
    FOREIGN KEY (message_id) REFERENCES agent_messages(id) ON DELETE CASCADE
);

turn_usage 表

CREATE TABLE turn_usage (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_id TEXT NOT NULL,
    branch_id TEXT NOT NULL DEFAULT 'main',
    user_turn_number INTEGER NOT NULL,
    requests INTEGER DEFAULT 0,
    input_tokens INTEGER DEFAULT 0,
    output_tokens INTEGER DEFAULT 0,
    total_tokens INTEGER DEFAULT 0,
    input_tokens_details JSON,
    output_tokens_details JSON,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (session_id) REFERENCES agent_sessions(session_id) ON DELETE CASCADE,
    UNIQUE(session_id, branch_id, user_turn_number)
);

完整示例

请查看完整示例，以全面演示所有功能。

API 参考

• AdvancedSQLiteSession - 主类
• Session - 基础会话协议