Fix type cast for BIGINT columns when number is negative

fixes #1376

Author: Dinwy

Changes.md

@@ -8,6 +8,7 @@ you spot any mistakes.
 
 * Add `POOL_CONNLIMIT` code to "No connections available." error #1332
 * Fix Query stream to emit close after ending #1349 #1350
+* Fix type cast for BIGINT columns when number is negative #1376
 * Performance improvements for array/object escaping in SqlString #1331
 * Support Node.js 6.x
 * Update `bignumber.js` to 2.3.0

lib/protocol/packets/RowDataPacket.js

@@ -100,7 +100,7 @@ function typeCast(field, parser, timeZone, supportBigNumbers, bigNumberStrings,
       numberString = parser.parseLengthCodedString();
       return (numberString === null || (field.zeroFill && numberString[0] == "0"))
         ? numberString
-        : ((supportBigNumbers && (bigNumberStrings || (Number(numberString) > IEEE_754_BINARY_64_PRECISION)))
+        : ((supportBigNumbers && (bigNumberStrings || (Number(numberString) >= IEEE_754_BINARY_64_PRECISION) || Number(numberString) <= -IEEE_754_BINARY_64_PRECISION))
           ? numberString
           : Number(numberString));
     case Types.BIT:

test/integration/connection/test-type-casting.js

@@ -11,6 +11,12 @@ var tests = [
   {type: 'double', insert: 5.5},
   {type: 'bigint', insert: '6', expect: 6},
   {type: 'bigint', insert: 6},
+  {type: 'bigint', insert: '9007199254740991', expect: 9007199254740991},
+  {type: 'bigint', insert: '9007199254740992', expect: '9007199254740992'},
+  {type: 'bigint', insert: '9223372036854775807', expect: '9223372036854775807'},
+  {type: 'bigint', insert: '-9007199254740991', expect: -9007199254740991},
+  {type: 'bigint', insert: '-9007199254740992', expect: '-9007199254740992'},
+  {type: 'bigint', insert: '-9223372036854775807', expect: '-9223372036854775807'},
   {type: 'mediumint', insert: 7},
   {type: 'year', insert: 2012},
   {type: 'timestamp', insert: new Date('2012-05-12 11:00:23')},
@@ -52,7 +58,7 @@ var tests = [
 
 var table = 'type_casting';
 
-common.getTestConnection(function (err, connection) {
+common.getTestConnection({supportBigNumbers: true}, function (err, connection) {
   assert.ifError(err);
 
   common.useTestDb(connection);