feat: made sure database connection gets closed upon exiting

src/manual_mode/manualMode.ts

-import neo4j from 'neo4j-driver';
+import neo4j, {Session} from 'neo4j-driver';
 import { Neo4jConnection } from 'ts-common';
 import { queryService } from '../queryService';
 import * as fs from 'fs';
@@ -6,56 +6,64 @@ import path from 'path';
 import argv from "process"
 import { createInterface } from 'readline';
 
+
 const rl = createInterface({
   input: process.stdin,
   output: process.stdout,
 });
 
-
 function manualQuery(cypherQuery: string, outputFile: string) {
     return `${cypherQuery} ${outputFile}` 
 }
 
-function connectToDataBase(uri: string, username: string, password: string){
-
-  
-    return `${uri} ${username} ${password}` 
+function connectToDataBase(uri: string, username: string, password: string): neo4j.Session | null {
+    try {
+        console.log(`Connecting to: ${uri}`);
+        const driver = neo4j.driver(uri, neo4j.auth.basic(username, password));
+        const session = driver.session(); // Create session here
+        console.log(`Connected successfully`);
+        return session;
+    } catch (error) {
+        console.error(`Error connecting to Neo4j: ${error}`);
+        return null;
+    }
 }
 
+
 if (require.main === module) {
     // Command-line args: 
     // 1st uri, 
     // 2nd username 
     // 3rd password
     // 4th output file name
-
     const uri: string = process.argv[2] || "bolt://localhost:7687"; // default neo4j port
     const username: string = process.argv[3] || "neo4j"; 
     const password: string = process.argv[4] || "password";  
-   
     const outputFile: string = process.argv[5] || 'output.json'; // Default output file if none provided
+    
+    const session: Session = connectToDataBase(uri, username, password)
 
-    // connect to neo4j 
-    try
-    {
-      console.log(`Connecting to: ${uri}`);
-
-      const driver = neo4j.driver(uri, neo4j.auth.basic(username, password));
-      const session = driver.session();
-    }
-    catch(error)
-    {
-      console.log(`Error connecting to neo4j: ${error}` ) 
-    }
     
-    console.log(`Connected succesfully`);
+    console.log("Type a cypher query to query or type 'exit' in order to exit")
 
     // reccursive function that executes queries
     const promptQuery = () => {
       rl.question('query: ', async (cypherQuery) => {
 
+        if(cypherQuery == "exit")
+        {
+            // todo: close database connections
+            if (session) {
+                await session.close();
+                console.log("Connection closed. Exiting...")
+            }
+            rl.close();
+            process.exit()
+        }
+
 
         try {
+         // todo: Perform query
           console.log(`Query ${cypherQuery} written to ${outputFile}`);
         } catch (err) {
           console.error('Error executing query:', err);