Add support for logical operators (AND/OR)

lib/mysql.js

@@ -388,11 +388,22 @@ MySQL.prototype.getColumns = function (model, props) {
   return names.join(', ');
 };
 
-function buildWhere(self, model, conds) {
+MySQL.prototype.buildWhere = function (model, conds) {
+  var self = this;
   var props = self._models[model].properties;
 
   var cs = [];
   Object.keys(conds).forEach(function (key) {
+    if (key === 'and' || key === 'or') {
+      var clauses = conds[key];
+      if (Array.isArray(clauses)) {
+        clauses = clauses.map(function (c) {
+          return '(' + self.buildWhere(model, c) + ')';
+        });
+        return clauses.join(' ' + key.toUpperCase() + ' ');
+      }
+      // The value is not an array, fall back to regular fields
+    }
     var keyEscaped = self.columnEscaped(model, key);
     var val = self.toDatabase(props[key], conds[key]);
     if (conds[key] === null || conds[key] === undefined) {
@@ -482,7 +493,7 @@ MySQL.prototype.all = function all(model, filter, callback) {
   if (filter) {
 
     if (filter.where) {
-      sql += ' ' + buildWhere(self, model, filter.where);
+      sql += ' ' + self.buildWhere(model, filter.where);
     }
 
     if (filter.order) {
@@ -528,7 +539,8 @@ MySQL.prototype.destroyAll = function destroyAll(model, where, callback) {
     where = undefined;
   }
   this.query('DELETE  FROM '
-    + this.tableEscaped(model) + ' ' + buildWhere(this, model, where || {}), function (err, data) {
+    + this.tableEscaped(model) + ' ' + this.buildWhere(model, where || {}),
+    function (err, data) {
       callback && callback(err, data);
   }.bind(this));
 };