Add JSON support in query and response

Readme.md

@@ -1175,6 +1175,19 @@ than a string.
 * TIME (could be mapped to Date, but what date would be set?)
 * GEOMETRY (never used those, get in touch if you do)
 
+### JSON Object
+
+Any string, that can be converted to JSON ("{json_object:true}") is return as JSON object.
+To insert or update JSON into TEXT column you can simply do:
+```js
+var query = connection.query('insert into table ?',[text_column:{json_object:true}], function(err, results) {
+```
+
+You cannot do this:
+```js
+var query = connection.query('insert into table text_column=?',{json_object:true}, function(err, results) {
+```
+
 It is not recommended (and may go away / change in the future) to disable type
 casting, but you can currently do so on either the connection:
 

lib/protocol/Parser.js

@@ -298,6 +298,15 @@ Parser.prototype.parseString = function(length) {
   var end = offset + length;
   var value = this._buffer.toString(this._encoding, offset, end);
 
+  var json;
+  if (value[0]=='{' && value[value.length-1]=='}' )
+  try{
+      json=JSON.parse(value);
+      if(typeof json!='number') value=json;
+  }
+  catch(abc){
+      json=null;
+  }
   this._offset = end;
   return value;
 };

lib/protocol/SqlString.js

@@ -37,7 +37,17 @@ SqlString.escape = function(val, stringifyObjects, timeZone) {
 
   if (typeof val === 'object') {
     if (stringifyObjects) {
-      val = val.toString();
+      // val=val.toString()
+      var found;
+      for(var i in val) {
+        if (i=='toString') found=true;
+      }
+        if(found){
+          val=val.toString();
+        }
+        else{
+          val = JSON.stringify(val);
+        }
     } else {
       return SqlString.objectToValues(val, timeZone);
     }

test/unit/pool/test-escape.js

@@ -12,7 +12,7 @@ server.listen(common.fakeServerPort, function (err) {
   assert.equal(pool.escape({ a: 123 }), "`a` = 123");
 
   assert.equal(pool2.escape('Super'), "'Super'");
-  assert.equal(pool2.escape({ a: 123 }), "'[object Object]'");
+  assert.equal(pool2.escape({ a: 123 }), "'{\\\"a\\\":123}'");
 
   pool.end(function (err) {
     assert.ifError(err);

test/unit/protocol/test-SqlString.js

@@ -55,19 +55,19 @@ test('SqlString.escape', {
   },
 
   'nested objects are cast to strings': function() {
-    assert.equal(SqlString.escape({a: {nested: true}}), "`a` = '[object Object]'");
+    assert.equal(SqlString.escape({a: {nested: true}}), "`a` = '{\\\"nested\\\":true}'");
   },
 
   'arrays are turned into lists': function() {
     assert.equal(SqlString.escape([1, 2, 'c']), "1, 2, 'c'");
   },
 
   'nested arrays are turned into grouped lists': function() {
-    assert.equal(SqlString.escape([[1,2,3], [4,5,6], ['a', 'b', {nested: true}]]), "(1, 2, 3), (4, 5, 6), ('a', 'b', '[object Object]')");
+    assert.equal(SqlString.escape([[1,2,3], [4,5,6], ['a', 'b', {nested: true}]]), "(1, 2, 3), (4, 5, 6), ('a', 'b', '{\\\"nested\\\":true}')");
   },
 
   'nested objects inside arrays are cast to strings': function() {
-    assert.equal(SqlString.escape([1, {nested: true}, 2]), "1, '[object Object]', 2");
+    assert.equal(SqlString.escape([1, {nested: true}, 2]), "1, '{\\\"nested\\\":true}', 2");
   },
 
   'strings are quoted': function() {
@@ -167,7 +167,7 @@ test('SqlString.format', {
 
   'objects is not converted to values': function () {
     var sql = SqlString.format('?', { 'hello': 'world' }, true);
-    assert.equal(sql, "'[object Object]'");
+    assert.equal(sql, "'{\\\"hello\\\":\\\"world\\\"}'");
 
     var sql = SqlString.format('?', { toString: function () { return 'hello'; } }, true);
     assert.equal(sql, "'hello'");