77 lines
2.5 KiB
TypeScript
77 lines
2.5 KiB
TypeScript
/**
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* Postgres + MySQL adapters built on Bun's native SQL client (`Bun.SQL`) — no
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* external driver dependency. Both speak the same `Driver` interface; only the
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* dialect (and thus the DDL types + placeholder style) differ.
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*
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* `Bun.SQL` pools connections, so transactions use its managed `begin(fn)` to
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* keep BEGIN/…/COMMIT on one reserved connection.
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*/
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import type { Dialect } from "../sql.ts";
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import type { Driver, Row, TxHandle } from "../driver.ts";
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interface BunSqlClient {
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unsafe(query: string, params?: unknown[]): Promise<unknown>;
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begin<T>(fn: (tx: BunSqlClient) => Promise<T>): Promise<T>;
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close(): Promise<void>;
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}
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interface ExecMeta {
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count?: number;
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affectedRows?: number;
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lastInsertRowid?: number | bigint;
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insertId?: number | bigint;
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}
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/** Convert the framework's portable positional placeholders for PostgreSQL. */
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export function sqlForDialect(sql: string, dialect: Dialect): string {
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if (dialect !== "postgres" || !sql.includes("?")) return sql;
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let index = 0;
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return sql.replace(/\?/g, () => `$${++index}`);
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}
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function runnerFor(client: BunSqlClient, dialect: Dialect): TxHandle {
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return {
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async query(sql, params = []): Promise<Row[]> {
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const rows = (await client.unsafe(sqlForDialect(sql, dialect), params)) as Iterable<Row>;
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return Array.from(rows);
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},
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async exec(sql, params = []) {
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const meta = (await client.unsafe(sqlForDialect(sql, dialect), params)) as ExecMeta;
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const id = meta.lastInsertRowid ?? meta.insertId;
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return {
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changes: Number(meta.affectedRows ?? meta.count ?? 0),
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lastInsertId: id != null ? Number(id) : undefined,
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};
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},
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};
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}
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/** Create a Bun.sql-backed driver for the given connection URL + dialect. */
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export function bunSql(url: string, dialect: Dialect): Driver {
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const Ctor = (Bun as unknown as { SQL: new (u: string) => BunSqlClient }).SQL;
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const client = new Ctor(url);
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const runner = runnerFor(client, dialect);
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return {
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dialect,
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query: runner.query,
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exec: runner.exec,
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transaction(fn) {
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return client.begin((tx) => fn(runnerFor(tx, dialect)));
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},
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close() {
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return client.close();
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},
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};
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}
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/** PostgreSQL adapter (`postgres://user:pass@host:5432/db`). Placeholders: `$N`. */
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export function postgres(url: string): Driver {
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return bunSql(url, "postgres");
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}
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/** MySQL adapter (`mysql://user:pass@host:3306/db`). Placeholders: `?`. */
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export function mysql(url: string): Driver {
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return bunSql(url, "mysql");
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}
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