使用本地模組更容易查詢

要簡化 ORACLE-DB 的查詢，你可能需要呼叫以下查詢：

const oracle = require('./oracle.js');

const sql = "select 'test' as c1, 'oracle' as c2 from dual";
oracle.queryObject(sql, {}, {})
    .then(function(result) {
        console.log(result.rows[0]['C2']);
    })
    .catch(function(err) {
        next(err);
    });

構建連線和執行包含在此 oracle.js 檔案中，內容如下：

'use strict';
const oracledb = require('oracledb');

const oracleDbRelease = function(conn) {
  conn.release(function (err) {
    if (err)
      console.log(err.message);
  });
};

function queryArray(sql, bindParams, options) {
    options.isAutoCommit = false; // we only do SELECTs
 
    return new Promise(function(resolve, reject) {
        oracledb.getConnection(
                  {
                    user          : "oli",
                    password      : "password",
                    connectString : "ORACLE_DEV_DB_TNA_NAME"
                })
        .then(function(connection){
            //console.log("sql log: " + sql + " params " + bindParams);
            connection.execute(sql, bindParams, options)
            .then(function(results) {
                resolve(results);
                process.nextTick(function() {
                    oracleDbRelease(connection);
                });
            })
            .catch(function(err) {
                reject(err);
 
                process.nextTick(function() {
                    oracleDbRelease(connection);
                        });
                    });
            })
            .catch(function(err) {
                reject(err);
            });
    });
}

function queryObject(sql, bindParams, options) {
    options['outFormat'] = oracledb.OBJECT; // default is oracledb.ARRAY
    return queryArray(sql, bindParams, options);
}

module.exports = queryArray; 
module.exports.queryArray = queryArray; 
module.exports.queryObject = queryObject;

請注意，你可以在 oracle 物件上呼叫 queryArray 和 queryObject 兩種方法。