example(basic): replicate rust's driver basic.rs example (#32)

closes #31

Signed-off-by: Daniel Boll <[email protected]>

examples/basic.mts

@@ -0,0 +1,37 @@
+import { Cluster, } from "../index.js"
+
+const nodes = process.env.CLUSTER_NODES?.split(",") ?? ["127.0.0.1:9042"];
+
+console.log(`Connecting to ${nodes}`);
+
+const cluster = new Cluster({ nodes });
+const session = await cluster.connect();
+
+await session.execute("CREATE KEYSPACE IF NOT EXISTS basic WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 }");
+await session.useKeyspace("basic");
+
+await session.execute("CREATE TABLE IF NOT EXISTS basic (a int, b int, c text, primary key (a, b))");
+
+await session.execute("INSERT INTO basic (a, b, c) VALUES (1, 2, 'abc')");
+await session.execute("INSERT INTO basic (a, b, c) VALUES (?, ?, ?)", [3, 4, "def"]);
+
+const prepared = await session.prepare("INSERT INTO basic (a, b, c) VALUES (?, 7, ?)");
+await session.execute(prepared, [42, "I'm prepared!"]);
+await session.execute(prepared, [43, "I'm prepared 2!"]);
+await session.execute(prepared, [44, "I'm prepared 3!"]);
+
+interface RowData {
+  a: number;
+  b: number;
+  c: string;
+}
+const result = await session.execute<RowData>("SELECT a, b, c FROM basic");
+console.log(result);
+
+const metrics = session.metrics();
+console.log(`Queries requested: ${metrics.getQueriesNum()}`);
+console.log(`Iter queries requested: ${metrics.getQueriesIterNum()}`);
+console.log(`Errors occurred: ${metrics.getErrorsNum()}`);
+console.log(`Iter errors occurred: ${metrics.getErrorsIterNum()}`);
+console.log(`Average latency: ${metrics.getLatencyAvgMs()}`);
+console.log(`99.9 latency percentile: ${metrics.getLatencyPercentileMs(99.9)}`);

index.d.ts

@@ -121,7 +121,7 @@ export class Metrics {
 }
 export class ScyllaSession {
   metrics(): Metrics
-  execute(query: string | Query | PreparedStatement, parameters?: Array<number | string | Uuid> | undefined | null): Promise<any>
+  execute<T = unknown>(query: string | Query | PreparedStatement, parameters?: Array<number | string | Uuid> | undefined | null): Promise<T>
   query(scyllaQuery: Query, parameters?: Array<number | string | Uuid> | undefined | null): Promise<any>
   prepare(query: string): Promise<PreparedStatement>
   batch(batch: BatchStatement, parameters: Array<Array<number | string | Uuid> | undefined | null>): Promise<any>