Properly format arrays (for e.g. ".. WHERE id IN (?)", [ array ] quer…

…ies)

Ported changes made by https://github.com/blkcat on his fork to latest mysql version.
Updated legacy test to work with new way of handling arrays as commented on issue #85
#85

lib/client.js

@@ -162,6 +162,8 @@ Client.prototype.format = function(sql, params) {
 };
 
 Client.prototype.escape = function(val) {
+  var escape = this.escape;
+
   if (val === undefined || val === null) {
     return 'NULL';
   }
@@ -171,6 +173,10 @@ Client.prototype.escape = function(val) {
     case 'number': return val+'';
   }
 
+  if (Array.isArray(val)) {
+    var sanitized = val.map( function( v ) { return escape( v ); } );
+    return "'" + sanitized.join( "','" ) + "'";
+  }
   if (typeof val === 'object') {
     val = (typeof val.toISOString === 'function')
       ? val.toISOString()

test/unit/legacy/test-client.js

@@ -41,7 +41,7 @@ test(function escape() {
   assert.equal(client.escape(true), 'true');
   assert.equal(client.escape(5), '5');
   assert.equal(client.escape({foo:'bar'}), "'[object Object]'");
-  assert.equal(client.escape([1,2,3]), "'1,2,3'");
+  assert.equal(client.escape([1,2,3]), "'1','2','3'");
   assert.equal(client.escape(new Date(Date.UTC(2011,6,6,6,6,6,6))), "'2011-07-06T06:06:06.006Z'");
 
   assert.equal(client.escape('Super'), "'Super'");