preparing the release.

.gitignore

@@ -8,3 +8,4 @@ test/typescript/*.js
 test/typescript/*.map
 typings/
 generated.js
+package-lock.json

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### Release History
 
+* 6.1.0 Switching over to the latest 6.4.0 `node-postgres` driver and its new connection pool. Released: June 25, 2017.
 * 5.9.0 Added support SQL aliases, plus method `ColumnSet.assign`. Released: June 05, 2017.
 * 5.8.0 Added support for warnings to class [QueryFile]. Released: May 29, 2017.
 * 5.7.0 Major query formatting overhaul for passing in the calling context. Released: May 15, 2017

lib/dbPool.js

@@ -0,0 +1,76 @@
+'use strict';
+
+const npm = {
+    con: require('manakin').local,
+    utils: require('./utils')
+};
+
+/**
+ * @class DatabasePool
+ * @private
+ */
+class DatabasePool {
+
+    constructor() {
+        this.dbMap = {}; // map of used databases
+        this.dbs = []; // all database objects
+    }
+
+    /**
+     * @method DatabasePool.register
+     * @private
+     * @description
+     *  - Registers each database object, to make sure no duplicates connections are used,
+     *    and if they are, produce a warning;
+     *  - Registers each Pool object, to be able to release them all when requested.
+     *
+     * @param {Database} db - The new Database object being registered.
+     */
+    register(db) {
+        const cnKey = DatabasePool.normalizeConnection(db.$cn);
+        if (cnKey in this.dbMap) {
+            if (!db.$config.options.noWarnings) {
+                npm.con.warn('WARNING: Creating a duplicate database object for the same connection.\n%s\n',
+                    npm.utils.getLocalStack(5));
+            }
+        } else {
+            this.dbMap[cnKey] = true;
+        }
+        this.dbs.push(db);
+    }
+
+    /**
+     * @method DatabasePool.shutDown
+     * @private
+     */
+    shutDown() {
+        this.dbs.forEach(db => {
+            db.$destroy();
+        });
+        this.dbs.length = 0;
+        this.dbMap = {};
+    }
+
+    /**
+     * @method DatabasePool.normalizeConnection
+     * @static
+     * @private
+     * @description
+     * For connections that are objects it reorders the keys alphabetically,
+     * and then serializes the result into a JSON string.
+     *
+     * @param {string|object} cn - connection string or object
+     */
+    static normalizeConnection(cn) {
+        if (typeof cn === 'object') {
+            const obj = {}, keys = Object.keys(cn).sort();
+            keys.forEach(name => {
+                obj[name] = cn[name];
+            });
+            cn = obj;
+        }
+        return JSON.stringify(cn);
+    }
+}
+
+module.exports = new DatabasePool();

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pg-promise",
-  "version": "6.0.26",
+  "version": "6.1.0",
   "description": "Promises interface for PostgreSQL",
   "main": "lib/index.js",
   "typings": "typescript/pg-promise.d.ts",

typescript/pg-promise.d.ts

@@ -1,5 +1,5 @@
 ////////////////////////////////////////
-// Requires pg-promise v6.0.26 or later.
+// Requires pg-promise v6.1.0 or later.
 ////////////////////////////////////////
 
 import * as XPromise from './ext-promise'; // External Promise Provider