feat: nene2.database 抽象化層と Alembic をセットアップする

.gitignore

@@ -11,3 +11,4 @@ dist/
 .env.local
 # uv.lock は再現性のためコミットする（削除）
 .coverage
+data/

alembic.ini

@@ -0,0 +1,149 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts.
+# this is typically a path given in POSIX (e.g. forward slashes)
+# format, relative to the token %(here)s which refers to the location of this
+# ini file
+script_location = %(here)s/alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+# Or organize into date-based subdirectories (requires recursive_version_locations = true)
+# file_template = %%(year)d/%%(month).2d/%%(day).2d_%%(hour).2d%%(minute).2d_%%(second).2d_%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.  for multiple paths, the path separator
+# is defined by "path_separator" below.
+prepend_sys_path = .
+
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the tzdata library which can be installed by adding
+# `alembic[tz]` to the pip requirements.
+# string value is passed to ZoneInfo()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to <script_location>/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "path_separator"
+# below.
+# version_locations = %(here)s/bar:%(here)s/bat:%(here)s/alembic/versions
+
+# path_separator; This indicates what character is used to split lists of file
+# paths, including version_locations and prepend_sys_path within configparser
+# files such as alembic.ini.
+# The default rendered in new alembic.ini files is "os", which uses os.pathsep
+# to provide os-dependent path splitting.
+#
+# Note that in order to support legacy alembic.ini files, this default does NOT
+# take place if path_separator is not present in alembic.ini.  If this
+# option is omitted entirely, fallback logic is as follows:
+#
+# 1. Parsing of the version_locations option falls back to using the legacy
+#    "version_path_separator" key, which if absent then falls back to the legacy
+#    behavior of splitting on spaces and/or commas.
+# 2. Parsing of the prepend_sys_path option falls back to the legacy
+#    behavior of splitting on spaces, commas, or colons.
+#
+# Valid values for path_separator are:
+#
+# path_separator = :
+# path_separator = ;
+# path_separator = space
+# path_separator = newline
+#
+# Use os.pathsep. Default configuration used for new projects.
+path_separator = os
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# database URL.  This is consumed by the user-maintained env.py script only.
+# other means of configuring database URLs may be customized within the env.py
+# file.
+sqlalchemy.url = sqlite:///data/nene2.db
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# lint with attempts to fix using "ruff" - use the module runner, against the "ruff" module
+# hooks = ruff
+# ruff.type = module
+# ruff.module = ruff
+# ruff.options = check --fix REVISION_SCRIPT_FILENAME
+
+# Alternatively, use the exec runner to execute a binary found on your PATH
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = ruff
+# ruff.options = check --fix REVISION_SCRIPT_FILENAME
+
+# Logging configuration.  This is also consumed by the user-maintained
+# env.py script only.
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARNING
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARNING
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/README

@@ -0,0 +1 @@
+Generic single-database configuration.

alembic/env.py

@@ -0,0 +1,75 @@
+"""Alembic migration environment.
+
+Reads DB_ADAPTER / DB_NAME from environment (via AppSettings) to build
+the SQLAlchemy URL. Falls back to alembic.ini sqlalchemy.url for offline mode.
+"""
+
+import os
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config, pool
+
+from alembic import context
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = None
+
+
+def _build_url() -> str:
+    """Build SQLAlchemy URL from environment variables."""
+    adapter = os.getenv("DB_ADAPTER", "sqlite")
+    db_name = os.getenv("DB_NAME", "data/nene2.db")
+
+    if adapter == "sqlite":
+        return f"sqlite:///{db_name}"
+    if adapter == "mysql":
+        user = os.getenv("DB_USER", "root")
+        password = os.getenv("DB_PASSWORD", "")
+        host = os.getenv("DB_HOST", "localhost")
+        port = os.getenv("DB_PORT", "3306")
+        return f"mysql+pymysql://{user}:{password}@{host}:{port}/{db_name}"
+    if adapter == "pgsql":
+        user = os.getenv("DB_USER", "postgres")
+        password = os.getenv("DB_PASSWORD", "")
+        host = os.getenv("DB_HOST", "localhost")
+        port = os.getenv("DB_PORT", "5432")
+        return f"postgresql+psycopg2://{user}:{password}@{host}:{port}/{db_name}"
+
+    return config.get_main_option("sqlalchemy.url") or ""
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=_build_url(),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    ini_section = config.get_section(config.config_ini_section, {})
+    ini_section["sqlalchemy.url"] = _build_url()
+
+    connectable = engine_from_config(
+        ini_section,
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,28 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

alembic/versions/001_create_notes_and_tags_tables.py

@@ -0,0 +1,44 @@
+"""create notes and tags tables
+
+Revision ID: 001
+Revises:
+Create Date: 2026-05-19
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "001"
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "notes",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("title", sa.String(200), nullable=False),
+        sa.Column("body", sa.Text, nullable=False),
+        sa.Column("created_at", sa.DateTime, server_default=sa.func.now(), nullable=False),
+        sa.Column(
+            "updated_at",
+            sa.DateTime,
+            server_default=sa.func.now(),
+            onupdate=sa.func.now(),
+            nullable=False,
+        ),
+    )
+    op.create_table(
+        "tags",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("name", sa.String(100), nullable=False, unique=True),
+        sa.Column("created_at", sa.DateTime, server_default=sa.func.now(), nullable=False),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("tags")
+    op.drop_table("notes")

pyproject.toml

@@ -9,6 +9,8 @@ dependencies = [
     "pydantic>=2.9",
     "pydantic-settings>=2.6",
     "python-multipart>=0.0.12",
+    "sqlalchemy>=2.0.49",
+    "alembic>=1.18.4",
 ]
 
 [project.optional-dependencies]

src/nene2/database/__init__.py

@@ -0,0 +1,13 @@
+"""NENE2 database abstraction layer."""
+
+from .exceptions import DatabaseConnectionException
+from .interfaces import DatabaseQueryExecutorInterface, DatabaseTransactionManagerInterface
+from .sqlalchemy_executor import SqlAlchemyQueryExecutor, SqlAlchemyTransactionManager
+
+__all__ = [
+    "DatabaseConnectionException",
+    "DatabaseQueryExecutorInterface",
+    "DatabaseTransactionManagerInterface",
+    "SqlAlchemyQueryExecutor",
+    "SqlAlchemyTransactionManager",
+]

src/nene2/database/exceptions.py

@@ -0,0 +1,5 @@
+"""Database exceptions."""
+
+
+class DatabaseConnectionException(Exception):
+    """Raised when a database connection cannot be established."""

src/nene2/database/interfaces.py

@@ -0,0 +1,43 @@
+"""Database abstraction interfaces.
+
+Equivalent to PHP Nene2\\Database\\DatabaseQueryExecutorInterface
+and DatabaseTransactionManagerInterface.
+"""
+
+from abc import ABC, abstractmethod
+from typing import Any
+
+
+class DatabaseQueryExecutorInterface(ABC):
+    """Execute parameterised SQL queries against a database."""
+
+    @abstractmethod
+    def fetch_all(
+        self, sql: str, params: dict[str, Any] | None = None
+    ) -> list[dict[str, Any]]: ...
+
+    @abstractmethod
+    def fetch_one(
+        self, sql: str, params: dict[str, Any] | None = None
+    ) -> dict[str, Any] | None: ...
+
+    @abstractmethod
+    def write(self, sql: str, params: dict[str, Any] | None = None) -> int:
+        """Execute INSERT / UPDATE / DELETE.
+
+        Returns lastrowid for INSERT, affected rowcount for UPDATE/DELETE.
+        """
+        ...
+
+
+class DatabaseTransactionManagerInterface(ABC):
+    """Manage database transactions."""
+
+    @abstractmethod
+    def begin(self) -> None: ...
+
+    @abstractmethod
+    def commit(self) -> None: ...
+
+    @abstractmethod
+    def rollback(self) -> None: ...