diff --git a/lib/sql.js b/lib/sql.js
index 6eea5842..b83303f1 100644
--- a/lib/sql.js
+++ b/lib/sql.js
@@ -43,7 +43,7 @@ BaseSQL.prototype.defineProperty = function (model, prop, params) {
 };
 
 BaseSQL.prototype.save = function (model, data, callback) {
-    var sql = 'UPDATE ' + this.tableEscaped(model) + ' SET ' + this.toFields(model, data) + ' WHERE ' + this.escapeName('id') + ' = ' + data.id;
+    var sql = 'UPDATE ' + this.tableEscaped(model) + ' SET ' + this.toFields(model, data) + ' WHERE ' + this.escapeName('id') + ' = ' + Number(data.id);
 
     this.query(sql, function (err) {
         callback(err);
@@ -53,7 +53,7 @@ BaseSQL.prototype.save = function (model, data, callback) {
 
 BaseSQL.prototype.exists = function (model, id, callback) {
     var sql = 'SELECT 1 FROM ' +
-        this.tableEscaped(model) + ' WHERE ' + this.escapeName('id') + ' = ' + id + ' LIMIT 1';
+        this.tableEscaped(model) + ' WHERE ' + this.escapeName('id') + ' = ' + Number(id) + ' LIMIT 1';
 
     this.query(sql, function (err, data) {
         if (err) return callback(err);
@@ -63,7 +63,7 @@ BaseSQL.prototype.exists = function (model, id, callback) {
 
 BaseSQL.prototype.find = function find(model, id, callback) {
     var sql = 'SELECT * FROM ' +
-        this.tableEscaped(model) + ' WHERE ' + this.escapeName('id') + ' = ' + id + ' LIMIT 1';
+        this.tableEscaped(model) + ' WHERE ' + this.escapeName('id') + ' = ' + Number(id) + ' LIMIT 1';
 
     this.query(sql, function (err, data) {
         if (data && data.length === 1) {
@@ -77,7 +77,7 @@ BaseSQL.prototype.find = function find(model, id, callback) {
 
 BaseSQL.prototype.destroy = function destroy(model, id, callback) {
     var sql = 'DELETE FROM ' +
-        this.tableEscaped(model) + ' WHERE ' + this.escapeName('id') + ' = ' + id;
+        this.tableEscaped(model) + ' WHERE ' + this.escapeName('id') + ' = ' + Number(id);
 
     this.command(sql, function (err) {
         callback(err);