| 1 | """SQLite-like SQL facade over witdb (bridge or native, ADR-0004).""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | from collections.abc import Sequence |
| 6 | from typing import Any, Protocol |
| 7 | |
| 8 | from pywitdb._bridge.client import BridgeClient, bridge_available |
| 9 | from pywitdb.exceptions import BridgeNotAvailableError, WitDbStoreError |
| 10 | |
| 11 | Backend = str |
| 12 | |
| 13 | |
| 14 | class Row: |
| 15 | """Mapping row keyed by column name (sqlite3.Row subset).""" |
| 16 | |
| 17 | __slots__ = ("_columns", "_values") |
| 18 | |
| 19 | def __init__(self, columns: Sequence[str], values: Sequence[Any]) -> None: |
| 20 | self._columns = tuple(columns) |
| 21 | self._values = tuple(values) |
| 22 | |
| 23 | def __getitem__(self, key: int | str) -> Any: |
| 24 | if isinstance(key, int): |
| 25 | return self._values[key] |
| 26 | try: |
| 27 | index = self._columns.index(key) |
| 28 | except ValueError as exc: |
| 29 | raise KeyError(key) from exc |
| 30 | return self._values[index] |
| 31 | |
| 32 | def keys(self) -> tuple[str, ...]: |
| 33 | return self._columns |
| 34 | |
| 35 | |
| 36 | class _SqlConnection(Protocol): |
| 37 | _last_insert_rowid: int |
| 38 | _last_rows_affected: int |
| 39 | |
| 40 | def close(self) -> None: ... |
| 41 | def last_insert_rowid(self) -> int: ... |
| 42 | |
| 43 | |
| 44 | class Cursor: |
| 45 | def __init__( |
| 46 | self, |
| 47 | conn: _SqlConnection, |
| 48 | *, |
| 49 | columns: Sequence[str], |
| 50 | rows: Sequence[Sequence[Any]], |
| 51 | ) -> None: |
| 52 | self._conn = conn |
| 53 | self._columns = list(columns) |
| 54 | self._rows = [tuple(row) for row in rows] |
| 55 | self._index = 0 |
| 56 | self.rowcount = conn._last_rows_affected |
| 57 | |
| 58 | def fetchone(self) -> Row | None: |
| 59 | if self._index >= len(self._rows): |
| 60 | return None |
| 61 | row = Row(self._columns, self._rows[self._index]) |
| 62 | self._index += 1 |
| 63 | return row |
| 64 | |
| 65 | def fetchall(self) -> list[Row]: |
| 66 | out: list[Row] = [] |
| 67 | while True: |
| 68 | row = self.fetchone() |
| 69 | if row is None: |
| 70 | break |
| 71 | out.append(row) |
| 72 | return out |
| 73 | |
| 74 | @property |
| 75 | def lastrowid(self) -> int: |
| 76 | return self._conn._last_insert_rowid |
| 77 | |
| 78 | |
| 79 | class BridgeConnection: |
| 80 | def __init__(self, client: BridgeClient, path: str) -> None: |
| 81 | self._client = client |
| 82 | self._path = path |
| 83 | self._closed = False |
| 84 | self._last_insert_rowid = 0 |
| 85 | self._last_rows_affected = 0 |
| 86 | self.row_factory: type[Row] | None = Row |
| 87 | |
| 88 | def execute(self, sql: str, params: Sequence[Any] | None = None) -> Cursor: |
| 89 | sql_stripped = sql.strip().upper() |
| 90 | if sql_stripped.startswith("SELECT") or sql_stripped.startswith("WITH"): |
| 91 | return self._query(sql, params) |
| 92 | return self._exec(sql, params) |
| 93 | |
| 94 | def executescript(self, sql: str) -> None: |
| 95 | self._exec(sql, None) |
| 96 | |
| 97 | def commit(self) -> None: |
| 98 | self._client.ensure_ok(self._client.request("sql_commit")) |
| 99 | |
| 100 | def rollback(self) -> None: |
| 101 | self._client.ensure_ok(self._client.request("sql_rollback")) |
| 102 | |
| 103 | def close(self) -> None: |
| 104 | if self._closed: |
| 105 | return |
| 106 | self._closed = True |
| 107 | self._client.close() |
| 108 | |
| 109 | def last_insert_rowid(self) -> int: |
| 110 | return self._last_insert_rowid |
| 111 | |
| 112 | def _exec(self, sql: str, params: Sequence[Any] | None) -> Cursor: |
| 113 | payload: dict[str, Any] = {"sql": sql} |
| 114 | if params: |
| 115 | payload["params"] = list(params) |
| 116 | resp = self._client.ensure_ok(self._client.request("sql_exec", **payload)) |
| 117 | self._last_rows_affected = int(resp.get("rows_affected") or 0) |
| 118 | if "last_insert_rowid" in resp: |
| 119 | self._last_insert_rowid = int(resp["last_insert_rowid"]) |
| 120 | return Cursor(self, columns=(), rows=()) |
| 121 | |
| 122 | def _query(self, sql: str, params: Sequence[Any] | None) -> Cursor: |
| 123 | payload: dict[str, Any] = {"sql": sql} |
| 124 | if params: |
| 125 | payload["params"] = list(params) |
| 126 | resp = self._client.ensure_ok(self._client.request("sql_query", **payload)) |
| 127 | columns = resp.get("columns") or [] |
| 128 | rows = resp.get("rows") or [] |
| 129 | return Cursor(self, columns=columns, rows=rows) |
| 130 | |
| 131 | def __enter__(self) -> BridgeConnection: |
| 132 | return self |
| 133 | |
| 134 | def __exit__(self, *exc: object) -> None: |
| 135 | self.close() |
| 136 | |
| 137 | |
| 138 | def connect( |
| 139 | path: str, |
| 140 | *, |
| 141 | password: str | None = None, |
| 142 | backend: Backend = "auto", |
| 143 | create: bool = True, |
| 144 | ) -> BridgeConnection | Any: |
| 145 | """Open a `.witdb` file and attach the SQL engine (native or bridge).""" |
| 146 | if backend in ("native", "auto"): |
| 147 | try: |
| 148 | from pywitdb._native.sql import open_native_sql, sql_native_available |
| 149 | |
| 150 | if sql_native_available(): |
| 151 | return open_native_sql(path, password=password, create=create) |
| 152 | except WitDbStoreError: |
| 153 | if backend == "native": |
| 154 | raise |
| 155 | |
| 156 | if backend == "native": |
| 157 | raise WitDbStoreError( |
| 158 | "native SQL unavailable; publish witdb.dll with witdb_sql_* exports" |
| 159 | ) |
| 160 | |
| 161 | if not bridge_available(): |
| 162 | raise BridgeNotAvailableError( |
| 163 | "witdb-bridge not found; build bridge/WitDbBridge or set WITDB_BRIDGE_PATH" |
| 164 | ) |
| 165 | |
| 166 | client = BridgeClient.start() |
| 167 | try: |
| 168 | client.open(path, password=password, create=create) |
| 169 | except Exception: |
| 170 | client.close() |
| 171 | raise |
| 172 | return BridgeConnection(client, path) |
| 173 | |
| 174 | |
| 175 | # Back-compat alias |
| 176 | Connection = BridgeConnection |
| 177 | |