make data conversion the same between native & javascript

lib/connection.js

@@ -154,7 +154,6 @@ p.bind = function(config, more) {
     if(val === null || typeof val === "undefined") {
       buffer.addInt32(-1);
     } else {
-      val = val.toString();
       buffer.addInt32(Buffer.byteLength(val));
       buffer.addString(val);
     }

lib/native/query.js

@@ -1,7 +1,8 @@
 var EventEmitter = require('events').EventEmitter;
 var util = require('util');
 
-var types = require(__dirname + "/../types");
+var types = require(__dirname + '/../types');
+var utils = require(__dirname + '/../utils');
 
 //event emitter proxy
 var NativeQuery = function(text, values, callback) {
@@ -31,21 +32,7 @@ var NativeQuery = function(text, values, callback) {
   //normalize values
   if(this.values) {
     for(var i = 0, len = this.values.length; i < len; i++) {
-      var item = this.values[i];
-      switch(typeof item) {
-      case 'undefined':
-        this.values[i] = null;
-        break;
-      case 'object':
-        this.values[i] = item === null ? null : JSON.stringify(item);
-        break;
-      case 'string':
-        //value already string
-        break;
-      default:
-        //numbers
-        this.values[i] = item.toString();
-      }
+      this.values[i] = utils.prepareValue(this.values[i]);
     }
   }
 

lib/query.js

@@ -1,8 +1,9 @@
 var EventEmitter = require('events').EventEmitter;
 var util = require('util');
 
-var Result = require(__dirname + "/result");
-var Types = require(__dirname + "/types");
+var Result = require(__dirname + '/result');
+var Types = require(__dirname + '/types');
+var utils = require(__dirname + '/utils');
 
 var Query = function(config) {
   this.text = config.text;
@@ -129,9 +130,9 @@ p.prepare = function(connection) {
 
   //TODO is there some better way to prepare values for the database?
   if(self.values) {
-    self.values = self.values.map(function(val) {
-      return (val instanceof Date) ? JSON.stringify(val) : val;
-    });
+    for(var i = 0, len = self.values.length; i < len; i++) {
+      self.values[i] = utils.prepareValue(self.values[i]);
+    }
   }
 
   //http://developer.postgresql.org/pgdocs/postgres/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY

lib/utils.js

@@ -91,11 +91,26 @@ var getLibpgConString = function(config, callback) {
   }
 }
 
+//converts values from javascript types
+//to their 'raw' counterparts for use as a postgres parameter
+//note: you can override this function to provide your own conversion mechanism
+//for complex types, etc...
+var prepareValue = function(val) {
+  if(val instanceof Date) {
+    return JSON.stringify(val);
+  }
+  if(typeof val === 'undefined') {
+    return null;
+  }
+  return val === null ? null : val.toString();
+}
+
 module.exports = {
   normalizeConnectionInfo: normalizeConnectionInfo,
   //only exported here to make testing of this method possible
   //since it contains quite a bit of logic and testing for
   //each connection scenario in an integration test is impractical
   buildLibpqConnectionString: getLibpgConString,
-  parseConnectionString: parseConnectionString
+  parseConnectionString: parseConnectionString,
+  prepareValue: prepareValue
 }

test/unit/connection/outbound-sending-tests.js

@@ -94,7 +94,7 @@ test('bind messages', function() {
     con.bind({
       portal: 'bang',
       statement: 'woo',
-      values: [1, 'hi', null, 'zing']
+      values: ['1', 'hi', null, 'zing']
     });
     var expectedBuffer = new BufferList()
       .addCString('bang')  //portal name