teradatasql/samples/FakeExportCSVResults.js

Teradata SQL Driver for Node.js

"use strict";
// Copyright 2023 by Teradata Corporation. All rights reserved.
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Object.defineProperty(exports, "__esModule", { value: true });
// This sample program demonstrates how to export the results from a multi-statement request into
// multiple csv files and obtain info on each statement using fake_result_sets escape function.
// Run "npm install csv" to install the CSV module
const fs = __importStar(require("fs"));
const sync_1 = require("csv-parse/sync");
// @ts-ignore
const teradatasql = __importStar(require("teradatasql"));
const con = teradatasql.connect({ host: "whomooz", user: "guest", password: "please" });
try {
    const cur = con.cursor();
    try {
        cur.execute("create volatile table voltab (c1 integer, c2 varchar(100)) on commit preserve rows");
        console.log("Inserting data");
        cur.execute("insert into voltab values (?, ?)", [
            [1, ""],
            [2, "abc"],
            [3, "def"],
            [4, "mno"],
            [5, ""],
            [6, "pqr"],
            [7, "uvw"],
            [8, "xyz"],
            [9, ""],
        ]);
        const asFileNames = ["dataJs.csv", "dataJs_1.csv", "dataJs_2.csv", "dataJs_3.csv", "dataJs_4.csv", "dataJs_5.csv"];
        console.log("Exporting table data to file", asFileNames);
        cur.execute("{fn teradata_write_csv(" +
            asFileNames[0] +
            ")}{fn teradata_fake_result_sets}select * from voltab order by 1 ; select * from voltab order by 1 desc ; select 123 as col1, 'abc' as col2");
        const re = new RegExp("\\d+");
        try {
            for (const sFileName of asFileNames) {
                console.log("Reading file", sFileName);
                let nFilenamePostfix;
                const m = sFileName.match(re);
                if (m) {
                    nFilenamePostfix = parseInt(m[0]);
                }
                else {
                    nFilenamePostfix = 0;
                }
                const records = (0, sync_1.parse)(fs.readFileSync(sFileName, { encoding: "utf-8" }));
                if (nFilenamePostfix & 1) {
                    console.log("Real result set");
                    for (const record of records) {
                        console.log(record);
                    }
                }
                else {
                    console.log("Fake result set");
                    const asColumnNames = records[0];
                    const row = records[1];
                    for (let i = 0; i < row.length; i++) {
                        console.log(`${asColumnNames[i].padEnd(15)} = ${row[i]}`);
                    }
                }
            }
        }
        finally {
            for (const sFileName of asFileNames) {
                fs.unlinkSync(sFileName);
            }
        }
    }
    finally {
        cur.close();
    }
}
finally {
    con.close();
}
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