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# 高级 SQLite 会话

`AdvancedSQLiteSession` 是基础 `SQLiteSession` 的增强版本，提供高级对话管理能力，包括对话分支、详细的使用情况分析以及结构化对话查询。

## 功能

- **对话分支**：从任意用户消息创建替代对话路径
- **使用情况追踪**：按轮次提供详细的 token 使用情况分析，并包含完整的 JSON 明细
- **结构化查询**：按轮次获取对话、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**：跟踪消息类型、工具使用情况和对话流程

## 快速开始

```python
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

```python
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)：对话会话的唯一标识符
- `db_path` (str | Path)：SQLite 数据库文件路径。默认为 `:memory:`，用于内存存储
- `create_tables` (bool)：是否自动创建高级表。默认为 `False`
- `logger` (logging.Logger | None)：用于会话的自定义日志记录器。默认为模块日志记录器

## 使用情况追踪

AdvancedSQLiteSession 通过按对话轮次存储 token 使用情况数据，提供详细的使用情况分析。**这完全依赖于在每次智能体运行后调用 `store_run_usage` 方法。**

### 使用情况数据存储

```python
# 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)
```

### 使用情况统计检索

```python
# 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)
```

## 对话分支

AdvancedSQLiteSession 的关键功能之一是能够从任意用户消息创建对话分支，从而让你探索替代的对话路径。

### 分支创建

```python
# 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

```python
# 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

```python
# 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 提供了多种方法，用于分析对话结构和内容。

### 对话分析

```python
# 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

会话会自动跟踪消息结构，包括：

- 消息类型（用户、assistant、tool_call 等）
- 工具调用的工具名称
- 轮次编号和序列号
- 分支关联
- 时间戳

## 数据库架构

AdvancedSQLiteSession 在基础 SQLite 架构之上扩展了两个额外的表：

### message_structure 表

```sql
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

```sql
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

查看[完整示例](https://github.com/openai/openai-agents-python/tree/main/examples/memory/advanced_sqlite_session_example.py)，全面了解所有功能。


## API 参考

- [`AdvancedSQLiteSession`][agents.extensions.memory.advanced_sqlite_session.AdvancedSQLiteSession] - 主类
- [`Session`][agents.memory.session.Session] - 基础会话协议