also check Statement objects for IsConstructCall

refs #29

src/statement.cc

@@ -82,6 +82,12 @@ template <class T> void Statement::Error(T* baton) {
 Handle<Value> Statement::New(const Arguments& args) {
     HandleScope scope;
 
+    if (!args.IsConstructCall()) {
+        return ThrowException(Exception::TypeError(
+            String::New("Use the new operator to create new Statement objects"))
+        );
+    }
+
     int length = args.Length();
 
     if (length <= 0 || !Database::HasInstance(args[0])) {

test/database_fail.test.js

@@ -5,6 +5,10 @@ exports['test Database() without new'] = function(beforeExit) {
     assert.throws(function() {
         sqlite3.Database(':memory:');
     }, (/Use the new operator to create new Database objects/));
+
+    assert.throws(function() {
+        sqlite3.Statement();
+    }, (/Use the new operator to create new Statement objects/));
 };
 
 exports['test Database#get prepare fail'] = function(beforeExit) {