add chdb contructor

Author: lmangani

README.md

@@ -16,17 +16,35 @@
 
 <br>
 
-### Example
-#### Query _(query, format)_
+### Examples
+
+#### Query Constructor
 ```javascript
+const addon = require('.');
 const chdb = require('chdb-node');
+const db = new chdb.db('CSV')
+var result;
+
+// Query (ephemeral)
+result = db.query("SELECT version()", "TabSeparated");
+console.log(result)
+
+// Query Session (persistent)
+db.session("CREATE FUNCTION IF NOT EXISTS hello AS () -> 'chDB'");
+result = db.session("SELECT hello()", "TabSeparated");
+console.log(result)
+```
+
+#### Query _(query, format)_
+```javascript
+const chdb = require('chdb-node').chdb;
 var result = chdb.Execute('SELECT version()', 'CSV');
 console.log(result) // 23.6.1.1
 ```
 
 #### Session _(query, *format, *path)_
 ```javascript
-const chdb = require('chdb-node');
+const chdb = require('chdb-node').chdb;
 chdb.Session("CREATE FUNCTION IF NOT EXISTS hello AS () -> 'chDB'")
 var result =  = chdb.Session("SELECT hello();")
 console.log(result) // chDB

example.js

@@ -1,3 +1,12 @@
 const addon = require('.');
-var result = addon.Execute('SELECT version()', 'TabSeparated');
+const db = new addon.db('CSV')
+var result;
+
+// Test query
+result = db.query("SELECT version()");
+console.log(result)
+
+// Test session
+db.session("CREATE FUNCTION IF NOT EXISTS hello AS () -> 'chDB'");
+result = db.session("SELECT hello()", "TabSeparated");
 console.log(result)

index.js

@@ -1,3 +1,20 @@
 //const chdb = require('./build/chdb.node');
 const chdb = require('node-gyp-build')(__dirname)
-module.exports = chdb;
+
+function db(format, path) {
+
+  this.format = format || 'JSONCompact';
+  this.path = path || '.';
+
+  // add properties to this
+  this.query = function(query, format){
+	return chdb.Execute(query, format || this.format);
+  }.bind(this);
+  this.session = function(query, format, path) {
+	return chdb.Session(query, format || this.format, path || this.path);
+  }.bind(this);
+
+  return this;  (implicitly)
+}
+
+module.exports = { chdb, db };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chdb-node",
-  "version": "0.11.5",
+  "version": "0.11.6",
   "description": "chdb bindings for nodejs",
   "main": "index.js",
   "scripts": {

test/test.js

@@ -1,4 +1,4 @@
-const { Execute } = require('..');
+const { Execute } = require('..').chdb;
 
 describe("Execution", () => {
 	test('Execute returns correct version', () => {