teradatasql/samples/AsyncConnectClose.js

Teradata SQL Driver for Node.js

"use strict";
// Copyright 2025 by Teradata Corporation. All rights reserved.
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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    o["default"] = v;
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var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
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    __setModuleDefault(result, mod);
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};
Object.defineProperty(exports, "__esModule", { value: true });
// This sample program demonstrates how to use connectAsync and closeAsync
// for non-blocking connection operations.
// @ts-ignore
const teradatasql = __importStar(require("teradatasql"));
async function main() {
    const con = new teradatasql.TeradataConnection();
    try {
        console.log("Connecting asynchronously to the database...");
        await con.connectAsync({ host: "whomooz", user: "guest", password: "please" });
        console.log("Connected successfully!");
        const cur = con.cursor();
        try {
            // Execute a simple query to verify the connection works
            cur.execute("select current_timestamp");
            const row = cur.fetchone();
            if (row) {
                console.log(`Current timestamp: ${row[0]}`);
            }
            // Demonstrate a query execution
            cur.execute("select 'Hello from Teradata!' as greeting");
            const result = cur.fetchone();
            if (result) {
                console.log(`Query result: ${result[0]}`);
            }
        }
        finally {
            cur.close();
        }
        console.log("Closing connection asynchronously...");
        await con.closeAsync();
        console.log("Connection closed successfully!");
    }
    catch (error) {
        console.error(`Error: ${error.message}`);
        // Ensure connection is closed even if an error occurs
        try {
            if (con) {
                await con.closeAsync();
            }
        }
        catch (closeError) {
            console.error(`Error closing connection: ${closeError.message}`);
        }
    }
} // end main
// Run the async main function
main()
    .then(() => {
    console.log("Sample completed successfully");
})
    .catch((error) => {
    console.error(`Unexpected error: ${error.message}`);
    process.exit(1);
});
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