Add nested if() test. Update source locations.

source/add-user.js

@@ -0,0 +1,47 @@
+function get_user_info() {
+    var fs = require("fs");
+    var stdinBuffer = fs.readFileSync(process.stdin.fd);
+    var line = stdinBuffer.toString();
+    console.log(line);
+    line = line.replace(/(\r\n|\n|\r)/gm, "");
+    return line
+}
+
+function get_new_id() {
+    return Math.floor(Math.random() * 12345);
+}
+
+function connect_db() {
+    const sqlite3 = require('sqlite3').verbose();
+    const db = new sqlite3.Database(
+        'users.sqlite',
+        sqlite3.OPEN_READWRITE | sqlite3.OPEN_FULLMUTEX, 
+        err => {
+            if (err){
+                console.log(err);
+                throw err;
+            } else {
+                console.log('DB opened');
+            }
+        });
+
+    return db;
+}
+
+function write_info(db, id, info) {
+    db.serialize();
+    const query = `INSERT INTO users VALUES (${id}, "${info}")`;
+    console.log(query);
+    db.exec(query);
+    db.close();
+}
+
+let add_user = () => {
+    console.log("Running add-user");
+    var info = get_user_info();
+    var id = get_new_id();
+    var db = connect_db();
+    write_info(db, id, info);
+}
+
+add_user()

source/sample-utility-0.js

@@ -0,0 +1,30 @@
+var SampleUtility = function(){};
+SampleUtility.prototype = Object.extendsObject(Processor, {
+    
+    setUserStatus: function() {
+        var value = this.getParameter('value');
+
+        var ua = new GR('users');
+        ua.query();
+        
+        if(!ua.hasNext()){
+            ua.initialize();
+            ua.setValue('status',value);
+            ua.insert();
+        }
+        else {
+            ua.next();
+            ua.setValue('status',value); // unsafe
+            ua.update();
+            // Nested if() test.
+            if (ua.safeToWrite()) {
+                ua.setValue('status', value); // safe
+                ua.update();
+            }        
+        }
+
+
+    },
+    
+    type: 'SampleUtility'
+});

source/sample-utility-1.js

@@ -0,0 +1,17 @@
+var SampleUtility = function () {
+    var value = this.getParameter('value');
+
+    var ua = new GR('users');
+    ua.query();
+
+    if (!ua.hasNext()) {
+        ua.initialize();
+        ua.setValue('status', value);
+        ua.insert();
+    }
+    else {
+        ua.next();
+        ua.setValue('status', value);
+        ua.update();
+    }
+}