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feat(memory): add SQLite memory service #4116

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ae187d8
feat(memory): add SQLite memory service
summerx96 Jan 11, 2026
5e10e4c
fix(memory): tolerate corrupted metadata json
summerx96 Jan 11, 2026
8bd8c13
Update src/google/adk/memory/sqlite_memory_service.py
summerx96 Jan 23, 2026
3c55c6b
fix(memory): enforce sqlite payload size limit
summerx96 Jan 27, 2026
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33 changes: 33 additions & 0 deletions contributing/samples/memory/README.md
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,33 @@
# Memory Sample

This sample demonstrates memory usage with ADK. The included `main.py` uses
in-memory services for simplicity. For persistent local memory, use SQLite.

## Persistent Local Memory (SQLite)

Programmatic usage:

```python
from google.adk.memory.sqlite_memory_service import SqliteMemoryService
from google.adk.runners import Runner
from google.adk.sessions.in_memory_session_service import InMemorySessionService

memory_service = SqliteMemoryService(db_path="memory.db")
runner = Runner(
app_name="my_app",
agent=agent.root_agent,
session_service=InMemorySessionService(),
memory_service=memory_service,
)
```

CLI usage (supported for `adk web` and `adk api_server`):

```bash
adk web path/to/agents_dir --memory_service_uri=sqlite:///memory.db
```

Notes:
- `sqlite:///memory.db` uses a relative path.
- `sqlite:////abs/path/memory.db` uses an absolute path.
- `adk run` currently ignores `--memory_service_uri`.
14 changes: 14 additions & 0 deletions src/google/adk/cli/service_registry.py
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Expand Up@@ -317,8 +317,22 @@ def agentengine_memory_factory(uri: str, **kwargs):
)
return VertexAiMemoryBankService(**params)

def sqlite_memory_factory(uri: str, **kwargs):
from ..memory.sqlite_memory_service import SqliteMemoryService

parsed = urlparse(uri)
db_path = parsed.path
if not db_path:
db_path = ":memory:"
elif db_path.startswith("/"):
db_path = db_path[1:]
Comment on lines +327 to +328

@gemini-code-assistgemini-code-assistBotJan 14, 2026

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medium

The logic for handling db_path when it starts with / is to remove the leading slash. This implies that absolute paths are expected to be provided without the leading slash when passed to SqliteMemoryService. While this works, it might be more intuitive to handle both sqlite:///path/to/db and sqlite:////abs/path/to/db (which urlparse would parse as /abs/path/to/db) consistently by ensuring db_path is correctly interpreted as an absolute path if it starts with / after parsing, rather than stripping it. However, given the current SqliteMemoryService expects db_path to be a str or Path and handles Path objects correctly, stripping the leading slash might be fine if SqliteMemoryService internally resolves relative paths from the current working directory or if the db_path is always expected to be relative unless explicitly handled as absolute by the caller.

kwargs_copy = kwargs.copy()
kwargs_copy.pop("agents_dir", None)
return SqliteMemoryService(db_path=db_path, **kwargs_copy)

registry.register_memory_service("rag", rag_memory_factory)
registry.register_memory_service("agentengine", agentengine_memory_factory)
registry.register_memory_service("sqlite", sqlite_memory_factory)


def _load_gcp_config(
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2 changes: 2 additions & 0 deletions src/google/adk/memory/__init__.py
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Expand Up@@ -15,13 +15,15 @@

from .base_memory_service import BaseMemoryService
from .in_memory_memory_service import InMemoryMemoryService
from .sqlite_memory_service import SqliteMemoryService
from .vertex_ai_memory_bank_service import VertexAiMemoryBankService

logger = logging.getLogger('google_adk.' + __name__)

__all__ = [
'BaseMemoryService',
'InMemoryMemoryService',
'SqliteMemoryService',
'VertexAiMemoryBankService',
]

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