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langgraph-checkpoint-mysql
Advanced tools
Library with a MySQL implementation of LangGraph checkpoint saver.
Implementation of LangGraph CheckpointSaver that uses MySQL.
[!TIP] The code in this repository tries to mimic the code in langgraph-checkpoint-postgres as much as possible to enable keeping in sync with the official checkpointer implementation.
[!NOTE] In order to keep the queries close to the Postgres queries, we use features that require MySQL >= 8.0.19 or MariaDB >= 10.7.1.
PyMySQLSaver
, install langgraph-checkpoint-mysql[pymysql]
.AIOMySQLSaver
, install langgraph-checkpoint-mysql[aiomysql]
.AsyncMySaver
, install langgraph-checkpoint-mysql[asyncmy]
.There is currently no support for other drivers.
[!IMPORTANT] When using MySQL checkpointers for the first time, make sure to call
.setup()
method on them to create required tables. See example below.
[!IMPORTANT] When manually creating MySQL connections and passing them to
PyMySQLSaver
orAIOMySQLSaver
, make sure to includeautocommit=True
.
from langgraph.checkpoint.mysql.pymysql import PyMySQLSaver
write_config = {"configurable": {"thread_id": "1", "checkpoint_ns": ""}}
read_config = {"configurable": {"thread_id": "1"}}
DB_URI = "mysql://mysql:mysql@localhost:3306/mysql"
with PyMySQLSaver.from_conn_string(DB_URI) as checkpointer:
# call .setup() the first time you're using the checkpointer
checkpointer.setup()
checkpoint = {
"v": 2,
"ts": "2024-07-31T20:14:19.804150+00:00",
"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
"channel_values": {
"my_key": "meow",
"node": "node"
},
"channel_versions": {
"__start__": 2,
"my_key": 3,
"start:node": 3,
"node": 3
},
"versions_seen": {
"__input__": {},
"__start__": {
"__start__": 1
},
"node": {
"start:node": 2
}
},
"pending_sends": [],
}
# store checkpoint
checkpointer.put(write_config, checkpoint, {}, {})
# load checkpoint
checkpointer.get(read_config)
# list checkpoints
list(checkpointer.list(read_config))
from langgraph.checkpoint.mysql.aio import AIOMySQLSaver
async with AIOMySQLSaver.from_conn_string(DB_URI) as checkpointer:
checkpoint = {
"v": 2,
"ts": "2024-07-31T20:14:19.804150+00:00",
"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
"channel_values": {
"my_key": "meow",
"node": "node"
},
"channel_versions": {
"__start__": 2,
"my_key": 3,
"start:node": 3,
"node": 3
},
"versions_seen": {
"__input__": {},
"__start__": {
"__start__": 1
},
"node": {
"start:node": 2
}
},
"pending_sends": [],
}
# store checkpoint
await checkpointer.aput(write_config, checkpoint, {}, {})
# load checkpoint
await checkpointer.aget(read_config)
# list checkpoints
[c async for c in checkpointer.alist(read_config)]
FAQs
Library with a MySQL implementation of LangGraph checkpoint saver.
We found that langgraph-checkpoint-mysql demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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