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https://github.com/langchain-ai/langgraph.git
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Vadym BardaandGitHub
c149a99b44
* checkpoint-sqlite: new library for sqlite checkpointer implementation
91 lines
1.7 KiB
Markdown
91 lines
1.7 KiB
Markdown
# LangGraph SQLite Checkpoint
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Implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via `aiosqlite`)
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## Usage
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```python
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from langgraph.checkpoint.sqlite import SqliteSaver
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checkpointer = SqliteSaver.from_conn_string(":memory:")
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checkpoint = {
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"v": 1,
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"ts": "2024-07-31T20:14:19.804150+00:00",
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"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
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"channel_values": {
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"my_key": "meow",
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"node": "node"
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},
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"channel_versions": {
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"__start__": 2,
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"my_key": 3,
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"start:node": 3,
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"node": 3
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},
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"versions_seen": {
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"__input__": {},
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"__start__": {
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"__start__": 1
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},
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"node": {
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"start:node": 2
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}
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},
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"pending_sends": [],
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"current_tasks": {}
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}
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# store checkpoint
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checkpointer.put(thread_config, checkpoint, {})
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# load checkpoint
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checkpointer.get(thread_config)
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# list checkpoints
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list(checkpointer.list(thread_config))
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```
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### Async
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```python
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from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
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checkpointer = AsyncSqliteSaver.from_conn_string(":memory:")
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checkpoint = {
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"v": 1,
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"ts": "2024-07-31T20:14:19.804150+00:00",
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"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
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"channel_values": {
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"my_key": "meow",
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"node": "node"
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},
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"channel_versions": {
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"__start__": 2,
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"my_key": 3,
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"start:node": 3,
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"node": 3
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},
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"versions_seen": {
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"__input__": {},
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"__start__": {
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"__start__": 1
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},
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"node": {
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"start:node": 2
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}
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},
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"pending_sends": [],
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"current_tasks": {}
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}
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# store checkpoint
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await checkpointer.aput(thread_config, checkpoint, {})
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# load checkpoint
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await checkpointer.aget(thread_config)
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# list checkpoints
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[c async for c in checkpointer.alist(thread_config)]
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``` |