NodePgSession Class — drizzle-orm Architecture

Source Code

drizzle-orm/src/node-postgres/session.ts lines 201–276

export class NodePgSession<
	TFullSchema extends Record<string, unknown>,
	TSchema extends TablesRelationalConfig,
> extends PgSession<NodePgQueryResultHKT, TFullSchema, TSchema> {
	static override readonly [entityKind]: string = 'NodePgSession';

	private logger: Logger;
	private cache: Cache;

	constructor(
		private client: NodePgClient,
		dialect: PgDialect,
		private schema: RelationalSchemaConfig<TSchema> | undefined,
		private options: NodePgSessionOptions = {},
	) {
		super(dialect);
		this.logger = options.logger ?? new NoopLogger();
		this.cache = options.cache ?? new NoopCache();
	}

	prepareQuery<T extends PreparedQueryConfig = PreparedQueryConfig>(
		query: Query,
		fields: SelectedFieldsOrdered | undefined,
		name: string | undefined,
		isResponseInArrayMode: boolean,
		customResultMapper?: (rows: unknown[][]) => T['execute'],
		queryMetadata?: {
			type: 'select' | 'update' | 'delete' | 'insert';
			tables: string[];
		},
		cacheConfig?: WithCacheConfig,
	): PgPreparedQuery<T> {
		return new NodePgPreparedQuery(
			this.client,
			query.sql,
			query.params,
			this.logger,
			this.cache,
			queryMetadata,
			cacheConfig,
			fields,
			name,
			isResponseInArrayMode,
			customResultMapper,
		);
	}

	override async transaction<T>(
		transaction: (tx: NodePgTransaction<TFullSchema, TSchema>) => Promise<T>,
		config?: PgTransactionConfig | undefined,
	): Promise<T> {
		const isPool = this.client instanceof Pool || Object.getPrototypeOf(this.client).constructor.name.includes('Pool'); // eslint-disable-line no-instanceof/no-instanceof
		const session = isPool
			? new NodePgSession(await (<pg.Pool> this.client).connect(), this.dialect, this.schema, this.options)
			: this;
		const tx = new NodePgTransaction<TFullSchema, TSchema>(this.dialect, session, this.schema);
		await tx.execute(sql`begin${config ? sql` ${tx.getTransactionConfigSQL(config)}` : undefined}`);
		try {
			const result = await transaction(tx);
			await tx.execute(sql`commit`);
			return result;
		} catch (error) {
			await tx.execute(sql`rollback`);
			throw error;
		} finally {
			if (isPool) (session.client as PoolClient).release();
		}
	}

	override async count(sql: SQL): Promise<number> {
		const res = await this.execute<{ rows: [{ count: string }] }>(sql);
		return Number(
			res['rows'][0]['count'],
		);
	}
}