fix in null bitmap calculation for 8,16,24,.. params sidorares#25

lib/packets/execute.js

@@ -32,6 +32,7 @@ Execute.prototype.toPacket = function()
       if (this.parameters[i] !== null) {
         if (this.parameters[i].constructor === Date) {
           var d = this.parameters[i];
+          // TODO: move to asMysqlDateTime()
           this.parameters[i] = [d.getFullYear(), d.getMonth() + 1, d.getDay()].join('-') +
             ' ' + [d.getHours(), d.getMinutes(), d.getSeconds()].join(':');
         }
@@ -71,7 +72,7 @@ Execute.prototype.toPacket = function()
         bitValue = 1;
       }
     }
-    if (bitValue != 256)
+    if (bitValue != 1)
       packet.writeInt8(bitmap);
 
     // TODO: explain meaning of the flag

test/integration/connection/test-execute-null-bitmap.js

@@ -0,0 +1,22 @@
+var common     = require('../../common');
+var connection = common.createConnection();
+var assert     = require('assert');
+
+var params = [1, 2];
+var query = 'select ? + ?';
+
+function dotest() {
+  connection.execute(query + ' as t', params, function(err, _rows, _fields) {
+    assert.equal(err, null);
+    if (params.length < 50) {
+      assert.equal(_rows[0].t, params.reduce(function(x,y) {return x+y;}));
+      query += ' + ?';
+      params.push(params.length);
+      dotest();
+    } else {
+      connection.end();
+    }
+  });
+}
+
+dotest();